deafsmogtech

I worked on a 2008 Jeep Grand Cherokee SRT-8 last week ago at the gas station for the front brake job. The RO invoice paper states "CUSTOMER REQUEST FRONT BRAKE ROTORS/PADS". Here is a nice detail of a 2008 Jeep
G-Cherokee SRT-8:
-Hemi 6.1L V8, handsome aluminum intake manifold, Electronic Throttle Control (ETC), 8 plug coils (twin plugs in one coil), 2- TWC (three way catalytic
converter) and 4 HO2S
-20 inch rims, real heavy wheel
-Front Brembo disc brake calipers, very lightest aluminum caliper, weight about 2 LBS.
-Big front rotors, size 14 inches diameter and 1.250 (1 1/4) thickness, found heavy scored on the surfaces of the rotors similar to MBZs/BMWs, replaced 2 new rotors/pads
-Blilstein struts on 4 corners, handsome AWD with aluminum front knuckles, front CV shafts
-4 link rear suspension with a long panhard link and aluminum driveshaft
- Easy access to serpentine belt under the vehicle better than remove air duct and fan shroud on the top
After the front brake job, I took it for road test. I cant believe that the 6.1 motor produces a lot of torque on the straight road, didnt rev up over 2500 RPM. The power and ride/handle charcartic that I describe it as a Vette, The
brake performance is incredible as the BMWs. I love it but I dislike ETC and AWD. I want to add this high performance Grand Cherokee SRT8 to my Xmas wish list. Hey the gas is horrible?? Not bother me.

Deafness

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sablescort

If u like old school, why dont u get the 1998 Jeep Grand Cherokee 5.9 Limited? Hell, it was the GC SRT-8 in its day being 1998's most powerful SUV with the 360 Magnum motor and less tech headaches compared to the 2008 SRT-8 GC.

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sequoias

Yeah, I saw that on the highway on my way to work few weeks ago. It looks cool.

That Jeep needed brake work already? I guess that customer was racing it on the racetrack for fun.

diehardbiker

Yea, thats why I love Jeep, the power and torque, its awesome.

My Cherokee and Wrangler is much lighter than Grand Cherokee, and got 4.0L, the power is unbelieveable. I can't stand driving GM SUV, because there is lack of power that Jeep has.

Gas? I know what your talking about.

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Mr. Averythest

I go up a 8% incline often (4-5miles) my 94 cherokee with 276k miles goes up that mountain 90+ mph easily.

Nice torque in these beast =D

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diehardbiker

Yup, I wonder why stupid Chrysler quit making Cherokees, I believe it is one of best SUV.

We STILL have Cherokee (98) with 120K miles and running real strong so far. We have no desire selling it, been super dependable and I love it.

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Please do not follow unless your driving REAL 4x4 with LOW!

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Plus Jeep Wrangler owner too.

The Highlander

Did you know AWD is better performance than 4x4. 4x4 need maintenance and 4x4's fluid smell AWFUL! AWD don't need maintenance. Oh yes, AWD is better fuel economy than 4x4.

ECT is better for cruise control, traction control, and stability control.

So you don't like AWD and ECT? What's wrong with you?

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The Highlander

My friend's wife just send 1995 (not sure) Jeep Grand Cherokee 5.9 V8 Limited to cash for clunkers. It have lot problem with oil pump, cv joint, coolant leak, and fuel pump's motor. It was only 85,000 mileage. Are you sure about less tech headaches? I don't think so.

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deafsmogtech

I tell you that I didnt know what is the SRT stand for? I ve been working on the Jeeps with any engines from 2.5L to 5.9L many times. I did drove them many times. I never see the older G- Cherokee SRT till I finally molested a 2008 SRT-8. Hey the 6.1L Hemi motor is not bad for aveage mechanics even weekend mechanics. The hemi shaped in combustion of the cylinder head is not true hemi. Thats what I learned. Dang. I believe the Hemi 5.7l or 6.1L are better than the 5.9L cuz they're modern technoloy.

deafsmogtech

I saw the odometer in a 2008 G-C SRT 8, was 18,558 miles on clock. The customer of this SUV is a female driver. The front brake job costs $700.
Prices on 2 rotors is $450, Pads? $150 plus $100 labor. If she is a heavy brake abuser, pay $700 annually execpt rear brake works.

deafsmogtech

Right, w/o 4X4, they are easy to manuever on the corner or parking lot, not good in the playgound of the rocks and deep muddy. A 2008 GC SRT-8 is not
suit to the offroad, only on flat roads.

deafsmogtech

The 4X4 is heavy than AWD but they are superior to the rock climber, AWD dont. You're right the maintenace for AWD is very low. I'm not AWD or 4X4 SUV expert cuz I never been on the offroad with a 4X4 vehicle before.
Hey, ETC not ECT ( I thought you talk about Engine Coolant Temp), have 3 main reasons: safety, economy and emission. More vehicles are using wire throttle bodies than old fashion cable throttle. Dang wire throttle body is cuz the PCM control the throttle body not to driver. I want to control throttle by cable for accurate engine respones like you do drifting or something. ETC can make automatic tranny shifting smoother no matter what you drive on any condition of the roads (can be weather condition). I feel no upshifting or harsh shifting in tranny that controlled by ETC, even I cant feel the engine rev, like dead engine but I saw the rev on clock, wtf. I someday study the modern engines later. I'm an old school mechanic

sequoias

Damn!

The Highlander

Yes, I mean ETC. Mostly RALLY use ETC


You are right about auto transmission. I like manual transmission over lazy auto transmission for better control on snow, race, etc. I thought you want high performance but you want rock climber. Rock climber don't really high performance. Just move slow and careful but high torque is must. If I want more torque then I will get diesel over gasoline for high torque.


Skip to 6:19 and watch whole about hill climb.

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purplecatty

Yeah, gear oil smells bad. It's typical. I've changed Gear oil on 2005 Jeep Liberty Limited axles.

Mine is just 4x4 and I like it when it become 2x2 until snow, mud or rain (on rain, if stopped up the hill on wet road, when you give it gas, it just spin tire, won't go up. cuz Liberty is light and didn't have much traction. Pull the lever to 4x4 and it'll go quickly ) I uses 4x4 when I need to.

Catty

deafsmogtech

I like to delete the AWD and ETC from a GC SRT-8 but can't do that cuz of the PCM. I'm stuck. The ETC system that bother me is safety issue. I feel the PCM maybe governor the engine speed if the Tire Pressure Monitor detects low pressure or flat tire(s), or over RPM limit, or malfunction ABS or tranny?
Thats why the ETC is designed to save the people's lives from the accidents.
I'm not sure if the ETC can be reprogrammable to match the driver's habit or taste.
I prefer a throttle cable over the wired throttle bodies as I can control the engine speed.

The Highlander

If you want driver's habit or taste or control the engine speed then get the manual transmission. Just give up auto transmission. I hate auto transmission because it's control car, not me.

Why were computers put on cars?

1. Improved emissions.
2. Fuel efficiency
3. Better drivability.

I thought you care of emission.

Did you know that PCM's governor will disable speed limit when you are in race track?
Check this video out

Also I LOVE PCM because I can read WHP, torque, Throttle %, lat accel, boost, IM pressure, In. temp, MAF rate, fuel trim (SB1), (SB2),(LB1),(LB2) baromter, fuel pressure, fuel level, engine load, timing advance, ECT, and EVAP pressure thru my iPod Touch with KIWI WIFI obd II.


PCM RULES!

Without PCM then spend more time to use old school tool like fuel pressure gauge, vacuum gauge, digital multimeter, and other.

I learned a lot from modern and old school engine. I know old school is very easy to repair but I like to take challenge! Sometime modern run better than old school like old school's fuel injector and ignition coil get fail then break down but modern's fuel injectors and coil-on-plug get fail but STILL RUN and engine light on to let you to know.

So why you don't like modern engine?

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deafsmogtech

Sadly to see the Jeep GC, 5.9 V8's life is short, 85k miles on it? Well, sounds famailar to me when I worked on the Jeeps many times. I've seen oil leakings from the oil filter adapter housings where the 'O' seal in the housings, became harden seal common on the 4 or 6 or 8 cylinder engines. Also oil leakings from the v/c or oil pan gaskets and crankshaft seals, that were caused by plugged PCV systems. Most coolant leaks came from the water pumps that I often replaced them same time as the thermostat replaced. Some coolant leaks from timing covers (corroded gaskets). Few torn CV boots in the fronts. Very few fuel pump failures that were caused by plugged fuel filters. Oil pump? I never see a single oil pump failure in any Jeeps of my mechanic years.

The Highlander

Maybe bad gasket, I mean leak oil from oil pump or something but friend don't bother to fix it anymore.

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deafsmogtech

Hey, I say I dont like ETC not PCM. Understand? I agree with your mention, I say about the ETC (Electronic Throttle Control) that I had some experince with the ETCs on the newer vehicles that I noticed the engine won't respone or pick up the speed when you accelerate the pedal about 25% or more after exit from the gas station or from the stop only turn on left or right corners. You see the post #4 by diehardbiker, mentioned about the GM SUV, is that I think it is ETC same happen to me before, I drove a 2005 Chevy Tahoe AWD with a 5.3L V8, on the straight road for road test (customer complaints no power), found the engine won't flare up when I accelerated the pedal about 50 to 75% when exited from the gas station, the engine will pick up the speed after back off pedal and re accelerate. Complicate. I told a customer to take it to the dealer for the ETC issue. I drove a MBZ or BMW
with ETC, there were no driveability problems. Thats why I negative with the ETC. I stay with the cabled throttle body.

The Highlander

Ah. I get your point now. I believe GM's program to control you and won't let you to push too much power and improve gas mileage.

I remember I checked on chevy cavalier for vacuum gauge. It said 20 in HG then I snap the engine and it won't drop to zero due cable at wrong location. Stupid GM.

I read lot people complained about GM's manual skip shift. So there is hack for it.
How To Disable GM's Manual Skip Shift For Seven Bucks - GM Skip Shift - Jalopnik

I have no problem with my Subaru with ETC too.

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cdaigle430

I have the Hemi 5.7 liter limited, one model below the SRT8 and I love the power and the AWD.

Attached Images

My Toy.JPG (7.8 KB, 7 views)

deafsmogtech

Interesting, hey ETC is not cheap part, expensive. Fk ETC. I remember I replaced 2 ETCs on a 2002 and 2005 Nissian Altimas. The new ETC came with a complete throttle body assy cuz the ETC were riveted to the body. Reprogram on a 2002 model after replaced new ETC assy. Relearn procedure on a 2005 model, can be manually or scan tool to reset the ETC relearn. I did fixed the loose female terminals of the ETC connector in a 2003 GMC Yukon, 5.3L. My smog tech who replaced a pedal accelerator sensor on a 2003 Toyota Camry, 3.0L. ETCs are horrible.

The Highlander

Wow. Sorry to hear that. My 2001 Subaru with 130k milesage still have stock ETC and it run smooth. Thank you for explain. I love to learn new something and troubleshooting for everyday.

I learned how to test on ETC from hand device (direct to ETC) and OBDII (laptop) but I never replace the ETC before.

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deafsmogtech

The 2002 Nissan Altima came with high idle and MIL on, I pulled a DTC P0505(Idle too high) , investigated the vacuum leaks and IAC, none of them were found and noticed the IAC was not in the system that confused me. I realized the ETC in the system, doesnt have IAC solenoid cuz the PCM control the butterfly throttle plate open/ close upon the start up such as cold start or A/C on or keep charge the battery when the electrical is consumption without hit the gas pedal. New throttle body that came with ETC/TPS as built-in assy, took a care of it. I saw the part invoice paper, quoted $450 dollars, guess the service writer charged a customer about $800 dollars. That was 2 years ago.

The Highlander

98' Buick Century came with high idle (2,000rpm) and MIL on, We checked thru real-time and oh my lord! ETC is 50% throttle. We can't control to ETC thru laptop (OBDII) . We disconnect ETC from PCM then use our hand device to ETC and no problem with control. So we replaced the new PCM then flash it. Now IDLE is 700rpm and 10% throttle. Total $300 for PCM only. Just happen in 6 months ago. It was my interpreter's Buick.

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sequoias

Good thing I have cable throttle on my Honda. I wish they still used cable throttle because it's more reliable and much simple. I don't see anything wrong with having cable throttle. The issues with cable throttle CAN happen is like stuck throttle cable or snapped off cable.

diehardbiker

I prefer cable throttle than "By wire" crap.

On other side, I can see its advantage which is in the event the vehicle is stolen, that technology can control by remote so that cop can safely stop the chasing.

Im sticking with the Jeep thing.

__________________
Please do not follow unless your driving REAL 4x4 with LOW!

FUN is standard...PAVEMENT is optional....



Plus Jeep Wrangler owner too.

The Highlander

You remind me from someone.

Dude walked in school's 88 Dodge shadow with manual. He started the engine and engine was ROAR like crazy. He was FREAKED OUT and shut it down. He walked out the car and he yelled "WHAT THE FUCK!?" So We checked the engine and we found throttle's spring was disconnect. That's mean throttle was WIDE open. I asked him how you feel when you start the engine? He said, "It fucking scary shit of me!"

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deafsmogtech

ETC in a 1998 Buick Century? Cant be. Must be a 2003 or newer. I better check
with the repair information tmw.