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Unread 01-27-2010, 09:45 AM   #1 (permalink)
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2005 Dodge Durango engine

I have an issue with Dodge Durango's 4.7 Liter V8 engine. It is "rocking" rhythm gently for long time while idling but accelerate smooth. When transmission was placed to Park or Neutral, Engine runs smooth.. Sometime I just lightly press accelerator just to move truck 1 or 2 mph during traffic and it makes my head bobs a little ( ). It's getting in my nerves right now.. It seem one cylinder is misfiring or something. It already had new sparkplugs but problem remains the same. Coil On Plug (COP) are plugged in correctly and there is no corrosion on wires or cracks on its shell. One of COP had reddish powder on its tip. I cleaned it and put it back in after installed new sparkplug. I did not put COP in order while replacing sparkplugs, I just plug it back in whichever is first pick because it works the same regardless. I wanted it to run smoothly. Sometime engine ran smoothly and other time it rocks (moody engine) depending on weather condition. There is no antifreeze (white smoke) or oil burning (black smoke) ect. I smelled exhaust and it's all normal.

:shrug:

Currently, I have engine light lit on since last summer (I replaced oxygen sensors). It turns off but later when weather became cold, it went back on and never bother to shut em up yet, just being lazy not trying to fix it. Does defective engine sensors causing engine to rock?

Question is that are V8 engine's gentle rocking motion normal or should it be smooth regardless?

Catty
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Unread 01-27-2010, 11:11 AM   #2 (permalink)
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The new engines today are more hi-tech than it was in the old days.

Your best bet is to e-mail Dodge headquarters.

Contact Dodge

If you are not mechanically inclined then you can ask at AutoZone.

Please be aware that Autozone may not have all the answers. Ask the Dodge H.Q. first.
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Unread 01-27-2010, 12:37 PM   #3 (permalink)
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Or try a Dodge forum.
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Unread 01-27-2010, 01:44 PM   #4 (permalink)
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1995 - 2003 Dodge cars/suvs/trucks isnt that great with cold weathers.

after 2003 dodge cars/suvs/trucks is much better than past.


i used to drive 2002 Dodge Neon SXT for temporary, its always have engine light on and off all the time, i repaired myself, drop off at auto mechanic, fixed, and still problems going on and on. So, i decided to sell, and sold it in less 3 days for just only 3,000 bucks...

i added: spoiler, new wheels and new tires, new spark plugs, and tint windows. Sold it out pretty quickly...it only have 87k..
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Unread 01-27-2010, 05:18 PM   #5 (permalink)
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Quote:
Originally Posted by purplecatty View Post
I have an issue with Dodge Durango's 4.7 Liter V8 engine. It is "rocking" rhythm gently for long time while idling but accelerate smooth. When transmission was placed to Park or Neutral, Engine runs smooth.. Sometime I just lightly press accelerator just to move truck 1 or 2 mph during traffic and it makes my head bobs a little ( ). It's getting in my nerves right now.. It seem one cylinder is misfiring or something. It already had new sparkplugs but problem remains the same. Coil On Plug (COP) are plugged in correctly and there is no corrosion on wires or cracks on its shell. One of COP had reddish powder on its tip. I cleaned it and put it back in after installed new sparkplug. I did not put COP in order while replacing sparkplugs, I just plug it back in whichever is first pick because it works the same regardless. I wanted it to run smoothly. Sometime engine ran smoothly and other time it rocks (moody engine) depending on weather condition. There is no antifreeze (white smoke) or oil burning (black smoke) ect. I smelled exhaust and it's all normal.

:shrug:

Currently, I have engine light lit on since last summer (I replaced oxygen sensors). It turns off but later when weather became cold, it went back on and never bother to shut em up yet, just being lazy not trying to fix it. Does defective engine sensors causing engine to rock?

Question is that are V8 engine's gentle rocking motion normal or should it be smooth regardless?

Catty
Any trouble Codes from DTC? Sound like misfired to me. My best guess is catalytic converter is plugged or COP got failed at low voltage, but I like to see and test with scan tool and gauge. If no DTC then should be idler pulley or loose belt. How many mileage on it?
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Unread 01-27-2010, 05:21 PM   #6 (permalink)
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Are you sure it's the motor? If the vehicle rocks at low speeds and smooths out at higher speeds it could be a busted belt on one of your tires. If it is the motor maybe a loose motor mount.
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Unread 01-28-2010, 12:02 AM   #7 (permalink)
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Originally Posted by rockdrummer View Post
Are you sure it's the motor? If the vehicle rocks at low speeds and smooths out at higher speeds it could be a busted belt on one of your tires. If it is the motor maybe a loose motor mount.
Busted tires. Nah!!
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Unread 01-28-2010, 01:26 AM   #8 (permalink)
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Quote:
Originally Posted by purplecatty View Post
I have an issue with Dodge Durango's 4.7 Liter V8 engine. It is "rocking" rhythm gently for long time while idling but accelerate smooth. When transmission was placed to Park or Neutral, Engine runs smooth.. Sometime I just lightly press accelerator just to move truck 1 or 2 mph during traffic and it makes my head bobs a little ( ). It's getting in my nerves right now.. It seem one cylinder is misfiring or something. It already had new sparkplugs but problem remains the same. Coil On Plug (COP) are plugged in correctly and there is no corrosion on wires or cracks on its shell. One of COP had reddish powder on its tip. I cleaned it and put it back in after installed new sparkplug. I did not put COP in order while replacing sparkplugs, I just plug it back in whichever is first pick because it works the same regardless. I wanted it to run smoothly. Sometime engine ran smoothly and other time it rocks (moody engine) depending on weather condition. There is no antifreeze (white smoke) or oil burning (black smoke) ect. I smelled exhaust and it's all normal.

:shrug:

Currently, I have engine light lit on since last summer (I replaced oxygen sensors). It turns off but later when weather became cold, it went back on and never bother to shut em up yet, just being lazy not trying to fix it. Does defective engine sensors causing engine to rock?

Question is that are V8 engine's gentle rocking motion normal or should it be smooth regardless?

Catty
You mean Rocking engine sounds like hunting? There is possible spark arcing on boots or plugs. Did you see lightly or thick black carbon tracks on the stem of the spark plug(s) and both inside/outside the spark plug boots. The carbon tracks can be light whitely color. Sign of track carbons found, replace all spark plug boots. No worry about mix up cops. Only misfire condition can cause the engine rock (rough running). Before you recheck the ignition system, check oil level in crankcase, make sure the engine use proper oil grade.
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Unread 01-28-2010, 03:19 AM   #9 (permalink)
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Quote:
Originally Posted by deafsmogtech View Post
You mean Rocking engine sounds like hunting? There is possible spark arcing on boots or plugs. Did you see lightly or thick black carbon tracks on the stem of the spark plug(s) and both inside/outside the spark plug boots. The carbon tracks can be light whitely color. Sign of track carbons found, replace all spark plug boots. No worry about mix up cops. Only misfire condition can cause the engine rock (rough running). Before you recheck the ignition system, check oil level in crankcase, make sure the engine use proper oil grade.
Ummhh!! You quoted "The carbon tracks can be light whitely color. Sign of track carbons found, replace all spark plug boots.". I did saw white carbon tracks on boot (powdery white carbon track??). No wonder... I'll have to ask auto parts to provide me replacement boots. Also one of boot have powdery red dust on one of COP.

The oil level in crankcase are fine, Oil grade are correct.

As for Engine rocking like hunting. No, it's just a gentle rock. While waiting on traffic (doesn't matter if its a traffic jams or traffic signal while on gear) engine just rocks gently (just like cat licking on top of sofa near where you sit. ).

I will have to take my truck to auto part to have the OBDII checked for free to see what it need to be replaced at the same time I can buy boots for COP.

Catty
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Unread 01-28-2010, 03:22 AM   #10 (permalink)
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Originally Posted by The Highlander View Post
Any trouble Codes from DTC? Sound like misfired to me. My best guess is catalytic converter is plugged or COP got failed at low voltage, but I like to see and test with scan tool and gauge. If no DTC then should be idler pulley or loose belt. How many mileage on it?
Ok I'll look into it. COP failed on low voltage, possibilty.. I will check with ohmmeter.

thanks

Catty
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Unread 01-28-2010, 03:25 AM   #11 (permalink)
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Quote:
Originally Posted by Heath View Post
The new engines today are more hi-tech than it was in the old days.

Your best bet is to e-mail Dodge headquarters.

Contact Dodge

If you are not mechanically inclined then you can ask at AutoZone.
Please be aware that Autozone may not have all the answers. Ask the Dodge H.Q. first.
Yup, engine are high tech. I wouldn't bother calling Dodge. I would just take it to auto parts to use their OBDII reader.

Catty
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Unread 01-28-2010, 09:33 AM   #12 (permalink)
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Originally Posted by rockdrummer View Post
Are you sure it's the motor? If the vehicle rocks at low speeds and smooths out at higher speeds it could be a busted belt on one of your tires. If it is the motor maybe a loose motor mount.
yes. it is true that some motor mounts have fluid filled or electronic control or
vacuum operation. I know Honda motor mount use vacuum actuator to smooth out the vibration. The fluid filled mounts are found on the euro cars. I dont know if the domestic vehicles use these methods of the motor mounts, maybe Cadillac?
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Unread 01-28-2010, 01:33 PM   #13 (permalink)
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Busted tires. Nah!!
I am talking about a broken steel belt. You may not eaisly see it but the symptoms are what you describe. Car shaking or wobbling at low speeds but smoothing out at faster speeds. You have to look closely all around each tire to discover it. Also a loose motor mount could cause these symptoms as well. I am just trying to offer some constructive opinion.. I am not saying I am right.

Quote:
Check the tires (all of them) by running your hand around the outside wall and the inside wall. If you feel a bump or a series of pricks, (that's what the band aid is for)chances are you have a broken belt. The tire is now no good and should be replaced.
Quote:
, broken belts throw off the balance of the wheel. Look for buldges or indentations in the tire. If the vibration is felt in the steering wheel, it is probably a front tire. If the vibration is felt in the seat, it is probably in a rear tire.

Most manufacturers will pro-rate a replacement tire for the manufactured defect. Cut tires, curbed tires, under-over inflation wear could also effect the warranty.

Vibrations could also be caused by other mechanical defects: lost wheel weight, bad wheel bearing, bad ball jounts, bad shocks, sticking brakes, etc. Rotate the front tires to the rear, if the vibration changes in the steering wheel, then chances are the problem is in the wheel/tire.
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Unread 01-28-2010, 10:25 PM   #14 (permalink)
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Any trouble Codes from DTC? Sound like misfired to me. My best guess is catalytic converter is plugged or COP got failed at low voltage, but I like to see and test with scan tool and gauge. If no DTC then should be idler pulley or loose belt. How many mileage on it?
You bet on ignition system for misfire. Plugged cat converter? Most on the OBD-I vehicles than the OBD-II vehicles. If low voltage feed to the COP then cause rough idle or running and set MIL for misfire codes. Idler pulley or loose belt? They can cause knock sensor(s) to set code(s). I think you talk about the loose crank pulley that can cause misfire.
I like to ask you some silly question about catty's car for misfire codes. If P0304, cylinder #4 misfire detected ( for example ), what do you do with a P0304 dignositic? Tell me. If you dont know then I love to tell you about my dignositic tricks.
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Unread 01-28-2010, 11:16 PM   #15 (permalink)
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Ok I'll look into it. COP failed on low voltage, possibilty.. I will check with ohmmeter.

thanks

Catty
Hey Dont touch anything on the engine till the MIL pop up or get codes from the part store or from you scanner tool. I tell you that I didnt use DVOM to check resistance in cops cuz the OBD-II PCM will set codes or misfire counters in live data. On older OBD-II vehicles like 1996-97 or 98 vehicles, you need DVOM to check cop or coil for resistance. Best way to measure current (amperage) on a cop is scopemeter with low amp pick up clamp to view real live waveforms. You can carry with scopemeter to drive a vehicle, just press a button to record the waveforms as long as you detect the misfire problem then bring the vehicle back to the shop, review a scopemeter's flight record. I havent try it before cuz I did some trick work on the cops.
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Unread 01-29-2010, 12:15 AM   #16 (permalink)
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Oh never mind...overlooked.
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Unread 01-29-2010, 03:01 PM   #17 (permalink)
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Quote:
Originally Posted by deafsmogtech View Post
You bet on ignition system for misfire. Plugged cat converter? Most on the OBD-I vehicles than the OBD-II vehicles. If low voltage feed to the COP then cause rough idle or running and set MIL for misfire codes. Idler pulley or loose belt? They can cause knock sensor(s) to set code(s). I think you talk about the loose crank pulley that can cause misfire.
I like to ask you some silly question about catty's car for misfire codes. If P0304, cylinder #4 misfire detected ( for example ), what do you do with a P0304 dignositic? Tell me. If you dont know then I love to tell you about my dignositic tricks.
I remembered one of my friend own the Jeep grand cherokee (1994??) and complained about engine got noise so hard and drain the battery so quick *they replaced the new battery and checked alternator ok.* No MIL at all. How to be loose crank pulley? So We found that idle pulley's nut was loose then just tight it and everything work good. You right, I don't remember that cause misfire but just noise. I still learn more and never give up.

I thought OBD-II is 1998 or more. I don't see many 97 or older vehicle at here.

P0304- More easy for me to see myself and test with my tools (scantool real-time data,scope waveform, balance fuel injector, resistance check fuel injector, fuel volume test, fuel pump waveform, fuel ignition waveform, secondary ignition waveform) My guess is fuel injector plugged, fuel injector failed, COP failed, spark plug failed, CO2 failed. If I don't know about diagnostic lab test then I will failed the class for SURE!
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Unread 01-29-2010, 03:12 PM   #18 (permalink)
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Originally Posted by deafsmogtech View Post
Hey Dont touch anything on the engine till the MIL pop up or get codes from the part store or from you scanner tool. I tell you that I didnt use DVOM to check resistance in cops cuz the OBD-II PCM will set codes or misfire counters in live data. On older OBD-II vehicles like 1996-97 or 98 vehicles, you need DVOM to check cop or coil for resistance. Best way to measure current (amperage) on a cop is scopemeter with low amp pick up clamp to view real live waveforms. You can carry with scopemeter to drive a vehicle, just press a button to record the waveforms as long as you detect the misfire problem then bring the vehicle back to the shop, review a scopemeter's flight record. I havent try it before cuz I did some trick work on the cops.
Some new COP like Honda 2008 can't check with DMM for resistance. You can use COP secondary test probe for waveform, it easy job and quick than DMM. We never drive a vehicle on the street for test. It's waste of time for misfire diagnostic. You just can press the gas to 3k rpm for 10 seconds and WOT for 1-2 seconds on P for auto or N for manual then we can find the problem from the scope.
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Last edited by The Highlander; 01-29-2010 at 04:10 PM.
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Unread 01-29-2010, 11:46 PM   #19 (permalink)
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I remembered one of my friend own the Jeep grand cherokee (1994??) and complained about engine got noise so hard and drain the battery so quick *they replaced the new battery and checked alternator ok.* No MIL at all. How to be loose crank pulley? So We found that idle pulley's nut was loose then just tight it and everything work good. You right, I don't remember that cause misfire but just noise. I still learn more and never give up.

I've heard about loose harmon balancer (trigger wheel) on a Ford 1.9L or 2.3L and 3.0L that caused strange misfires.

I thought OBD-II is 1998 or more. I don't see many 97 or older vehicle at here.

P0304- More easy for me to see myself and test with my tools (scantool real-time data,scope waveform, balance fuel injector, resistance check fuel injector, fuel volume test, fuel pump waveform, fuel ignition waveform, secondary ignition waveform) My guess is fuel injector plugged, fuel injector failed, COP failed, spark plug failed, CO2 failed. If I don't know about diagnostic lab test then I will failed the class for SURE!
COPS are simple and easy to replace. But sometime they are hard to diagnose or replace on some vehicles.

Suppose if you come over Catty's place to diagnose his car. You pulled a code P0304, cylinder#4 misfire detected from your pocket scan tool.
What to do? Check all fluid levels and visual inspection on the engine to see if anything broken or missing, before you investigate the misfire condition. Start the engine and run. Grab a long driverscrew and probe #4 injector as you feel pulses from injector, move a driverscrew to another injector to see if there is same pulse. Next....(Turn engine off)
Remove #4 COP ( make sure you examine it for carbon tracks or cracks) from the cyl #4 and swap #4 COP to cylinder #1 (as you random any COP if you like to swap)
Remove #4 spark plug from cyl #4, swap to cyl #3 ( don't swap to cyl#1)
#3 spark plug swap to cyl #4
Install #1 COP in cyl#4. Write down record of swapping COPS and plugs
Clear code. Take a car for drive around and observe the MIL. MIL pop up again. You are exciting to pull the code(s).....

P0301, cylinder#1 misfire detected that indicates bad #4 COP cuz you swapped. Sound easy diagnose.

P0303, cylinder #3 misfire detected that indicates bad #4 spark plug cuz you swapped #4 plug to cyl#3. Understand clear?

P0304 cylinder #4 misfire detected, same code after swapped COPs and plugs. You would suspect low compression or bad #4 injector?
You can try to swap an injector to another position to see if code changes
The Number One cylinder is on left bank side along with 3,5,and 7. On right
bank side is 2,4,6, and 8.
Beware of the disabled injector cuz some modern OBD-II PCM will disable injector(s) when detects misfire cylinders.
Highlander, what do you think? Even Catty dont have a fancy scopemeter, he can do the method of diagnositic. deafsmogtech
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Unread 01-30-2010, 12:44 AM   #20 (permalink)
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Originally Posted by deafsmogtech View Post
COPS are simple and easy to replace. But sometime they are hard to diagnose or replace on some vehicles.

Suppose if you come over Catty's place to diagnose his car. You pulled a code P0304, cylinder#4 misfire detected from your pocket scan tool.
What to do? Check all fluid levels and visual inspection on the engine to see if anything broken or missing, before you investigate the misfire condition. Start the engine and run. Grab a long driverscrew and probe #4 injector as you feel pulses from injector, move a driverscrew to another injector to see if there is same pulse. Next....(Turn engine off)
Remove #4 COP ( make sure you examine it for carbon tracks or cracks) from the cyl #4 and swap #4 COP to cylinder #1 (as you random any COP if you like to swap)
Remove #4 spark plug from cyl #4, swap to cyl #3 ( don't swap to cyl#1)
#3 spark plug swap to cyl #4
Install #1 COP in cyl#4. Write down record of swapping COPS and plugs
Clear code. Take a car for drive around and observe the MIL. MIL pop up again. You are exciting to pull the code(s).....

P0301, cylinder#1 misfire detected that indicates bad #4 COP cuz you swapped. Sound easy diagnose.

P0303, cylinder #3 misfire detected that indicates bad #4 spark plug cuz you swapped #4 plug to cyl#3. Understand clear?

P0304 cylinder #4 misfire detected, same code after swapped COPs and plugs. You would suspect low compression or bad #4 injector?
You can try to swap an injector to another position to see if code changes
The Number One cylinder is on left bank side along with 3,5,and 7. On right
bank side is 2,4,6, and 8.
Beware of the disabled injector cuz some modern OBD-II PCM will disable injector(s) when detects misfire cylinders.
Highlander, what do you think? Even Catty dont have a fancy scopemeter, he can do the method of diagnositic. deafsmogtech

I am agreed with you about trick. Thank you for tell me about the screwdriver and the pulse (I noticed that I feels the pulse when I holds the balance fuel injector), I just learned it. I hope Catty can find the problem.


Yeah, That's what my teacher said if we don't have any tool for COP then just swapped the COPS like you said. It takes a lot of time and lot of work for some vehicles. I like to use secondary ignition test probe and perfect for tight engine and quick job.

Check it out.

Coil-On-Plug Secondary Test Probe
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Unread 01-31-2010, 08:21 PM   #21 (permalink)
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Originally Posted by deafsmogtech View Post
COPS are simple and easy to replace. But sometime they are hard to diagnose or replace on some vehicles.

Suppose if you come over Catty's place to diagnose his car. You pulled a code P0304, cylinder#4 misfire detected from your pocket scan tool.
What to do? Check all fluid levels and visual inspection on the engine to see if anything broken or missing, before you investigate the misfire condition. Start the engine and run. Grab a long driverscrew and probe #4 injector as you feel pulses from injector, move a driverscrew to another injector to see if there is same pulse. Next....(Turn engine off)
Remove #4 COP ( make sure you examine it for carbon tracks or cracks) from the cyl #4 and swap #4 COP to cylinder #1 (as you random any COP if you like to swap)
Remove #4 spark plug from cyl #4, swap to cyl #3 ( don't swap to cyl#1)
#3 spark plug swap to cyl #4
Install #1 COP in cyl#4. Write down record of swapping COPS and plugs
Clear code. Take a car for drive around and observe the MIL. MIL pop up again. You are exciting to pull the code(s).....

P0301, cylinder#1 misfire detected that indicates bad #4 COP cuz you swapped. Sound easy diagnose.

P0303, cylinder #3 misfire detected that indicates bad #4 spark plug cuz you swapped #4 plug to cyl#3. Understand clear?

P0304 cylinder #4 misfire detected, same code after swapped COPs and plugs. You would suspect low compression or bad #4 injector?
You can try to swap an injector to another position to see if code changes
The Number One cylinder is on left bank side along with 3,5,and 7. On right
bank side is 2,4,6, and 8.
Beware of the disabled injector cuz some modern OBD-II PCM will disable injector(s) when detects misfire cylinders.
Highlander, what do you think? Even Catty dont have a fancy scopemeter, he can do the method of diagnositic. deafsmogtech
Yes, I can feel injector pulses with my fingers. I will do what you suggest. The only problem is that I don't have OBDII scanner yet. Originally above my posting, I will take my truck to auto part and borrow their OBDII to find out what's engine check light telling me. Then after replacing parts, see how engine runs. If it runs the same after check light been reset, I will do further investigation regarding to COP and Injectors and do tricks on that. If one of injector is bad, I know it's over $100 to replace it. Injectors are unpredictable that it may go bad too soon or go bad after 200k miles. Also will check the voltage spike on each injector to see how strong pulse voltage.

Even Catty dont have a fancy scopemeter, he can do the method of diagnositic. Yeah, that's correct!! I don't have that fancy stuff. I will use the methods you suggested.

Another thought, Fuel filter?? I haven't changed it since I bought my truck. It's now 73,000 miles on it. I am fully aware that fuel filter must be changed between 50k to 100k miles. I'll have it replaced.

I haven't done anything on my truck yet. I was soo busy last week catching things up in my house and other things cuz I was on one week vacation. I had alot things in my mind tho.

Catty
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Unread 01-31-2010, 08:27 PM   #22 (permalink)
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Originally Posted by The Highlander View Post
I am agreed with you about trick. Thank you for tell me about the screwdriver and the pulse (I noticed that I feels the pulse when I holds the balance fuel injector), I just learned it. I hope Catty can find the problem.


Yeah, That's what my teacher said if we don't have any tool for COP then just swapped the COPS like you said. It takes a lot of time and lot of work for some vehicles. I like to use secondary ignition test probe and perfect for tight engine and quick job.

Check it out.

Coil-On-Plug Secondary Test Probe
Using long screwdriver is old adage methods. 25 years ago, My brother used that to find out if water pump bearing is wearing out or not. He predict so well that he warned me it'll go out in 2 weeks. 2nd week, my old PO jeep water pump went out. Sheesh!! I wish I can learn to hear that sound through long screwdriver. Back then, I was wearing HA and I only hear engine roaring noise. Right now, I have CI and I would be able to narrow down the noise better.

Harbor Freights tools sell mechanic stethoscope with long rod on its end to help detect bad bearing or problems in engine. Problem is that we're deaf and need some amplification in between so we can hear it

I do have 20mhz Oscilloscope machine collecting dust in basement but I don't know how to detect difference in "noise" pattern unless I understand where to spot it.


Catty
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Unread 02-02-2010, 01:09 AM   #23 (permalink)
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Catty,
I found some information of a misfire condition on a 4.7L. They were caused by the water (rainy and car wash) enter the spark plug wells and O- rings of COP's stems. O- rings use to sealing the spark plug wells to prevent water or foreign materials enter the wells. Wet in the wells causes spark arcing. I hope they fit to your complaint. Hey the boots and springs of the COPs are not
serviced separately.... though. Get codes from scan tool at the part store.
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Unread 02-02-2010, 07:21 AM   #24 (permalink)
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Catty,
I found some information of a misfire condition on a 4.7L. They were caused by the water (rainy and car wash) enter the spark plug wells and O- rings of COP's stems. O- rings use to sealing the spark plug wells to prevent water or foreign materials enter the wells. Wet in the wells causes spark arcing. I hope they fit to your complaint. Hey the boots and springs of the COPs are not
serviced separately.... though. Get codes from scan tool at the part store.
How get water inside the COP thru the hood?
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Unread 02-02-2010, 04:02 PM   #25 (permalink)
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Wouldn't that water evaporate from the warmed engine anyway?
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Unread 02-02-2010, 06:12 PM   #26 (permalink)
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Originally Posted by deafsmogtech View Post
Catty,
I found some information of a misfire condition on a 4.7L. They were caused by the water (rainy and car wash) enter the spark plug wells and O- rings of COP's stems. O- rings use to sealing the spark plug wells to prevent water or foreign materials enter the wells. Wet in the wells causes spark arcing. I hope they fit to your complaint. Hey the boots and springs of the COPs are not
serviced separately.... though. Get codes from scan tool at the part store.
That's what I thought so because of dried white powders on 2 or 3 of my COP and 1 red powder on one of COP. I did suspect it's water something but couldn't figure out how it got in but I suspect it got in back of hood when it's closed. Of course hood is big and wide, back of hood does have gasket under it. I doubt it'll seal off water well. I don't know if airfoil lifts the back end of hood a little to allow water leak into engine especially during heavy rain on highway... I was worried that it might have antifreeze leak but I doubt so because Antifreeze is orange in color.

Since last year, Kansas have above normal rainfall. It was rainy pretty often and I noticed that several COPs like I mentioned above have those powders which are unusual because several years ago, it was just only one and engine was running smooth. I think problems started last year.

I will try replacing seals and clean off the powder ect.

I will take pix of several COPs with power on it to give you an idea.

Catty
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Unread 02-02-2010, 09:58 PM   #27 (permalink)
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That's what I thought so because of dried white powders on 2 or 3 of my COP and 1 red powder on one of COP. I did suspect it's water something but couldn't figure out how it got in but I suspect it got in back of hood when it's closed. Of course hood is big and wide, back of hood does have gasket under it. I doubt it'll seal off water well. I don't know if airfoil lifts the back end of hood a little to allow water leak into engine especially during heavy rain on highway... I was worried that it might have antifreeze leak but I doubt so because Antifreeze is orange in color.

Since last year, Kansas have above normal rainfall. It was rainy pretty often and I noticed that several COPs like I mentioned above have those powders which are unusual because several years ago, it was just only one and engine was running smooth. I think problems started last year.

I will try replacing seals and clean off the powder ect.

I will take pix of several COPs with power on it to give you an idea.

Catty

Your antifreeze is orange?! I thought DEX-COOL is for GM only but Dodge use dex-cool? Can't be!

deafsmogtech, is true Dodge use dex-cool?
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Unread 02-02-2010, 09:59 PM   #28 (permalink)
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I'm not sure....I work for Enterprise rent a car, I could check that for you tomorrow if I get to wash a dodge vehicle.
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Unread 02-02-2010, 10:59 PM   #29 (permalink)
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Your antifreeze is orange?! I thought DEX-COOL is for GM only but Dodge use dex-cool? Can't be!

deafsmogtech, is true Dodge use dex-cool?
Yes, it is true, All Dodge or Chrystler use Dex-Cool. I own Durango, Jeep Liberty and formerly 2001 Dodge Grand Caravan Sport all use Dex-Cool.

Instruction manual says that must use Mopar Dex-Cool or equavalent. If some place do not have Dex-Cool, it can use green antifreeze for temporary but require to purge and fill with Dex-Cool.

Catty
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Unread 02-02-2010, 11:25 PM   #30 (permalink)
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I'm not sure....I work for Enterprise rent a car, I could check that for you tomorrow if I get to wash a dodge vehicle.
Why don't you spray the hose directly to back of closed hood (between hood and wiper area) and see if water get into engine. Try it on Dodge Durango. It is like when on highway speed and air "lifts" the hood a bit and back of it would leave a gap to allow water getting into engine. That's my theory.

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