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Prev Professional Automotive Repair Technical Discussions for November 6, 2007
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Open Help Requests for GM
Help Request Answers
1988 Buick Regal Limited 2.8L MIL Lamp on VIN: 2G4WD14W8J
Customer brought car in with a complaint of MIL on. The light came on after an alternator and battery replacement. She then took it to a local auto parts store that will scan for free and they told her there was an EGR failure. Rather than rely on someone els... Trouble codes: 67 (Unknown)
1997 Cadillac Seville STS 4.6L Check Oil Level VIN: 1G6KY5294V
Vehicle Keeps Flashing Chceck Engine Oil Level. Oil Level is Ok? Shop Key has no diagnostic info on this. Car runs ok under wide open throttle it shows a code p0131-mass air flow. Temp is at 208 and no fans come on. coolant level is ok. never low. I have heard...
1982 Chevrolet Corvette 5.7L Poor Idle Quality, Hesitation VIN: 1G1AY878XC
Hello, You may need to ask some old timers about this one.My main concern here is the hesitation.At one point it was horrible and would barely make it around the block with backfireing through the throttle bodies and stalling.fuel pressure was low ( about 8-9 ...
1994 Chevrolet Astro CL 4.3L Poor Idle Quality, Stall VIN: 1GNDM19Z7R
hi every i have a problem child here this van first came in for won/t idle found egr stuck open r/r that now it idles but the fuel injectors cough every couple times and the engine stumbels. spray looks good runs fine driveing but come a stop then the injector...
1999 Chevrolet Camaro 5.7L 3rd gear
I'm sorry I don't have the VIN. Got to thinking about this thing here at home. Car came in today with the complaint that it wouldn't go any faster than 40. Keep in mind that this POS is modded. Checked the oil, was 2 qt low. MIL on from having no cats, I check...
2000 Chevrolet S10 2.2L squeeling noise VIN: 1GCCS1954Y
hello everyone, this is my first time so go easy on me. This is a friends vehicle. It just started making a loud squeeling noise above 2000 rpm in neutral. the noise started on the freeway at 65 mph and continued to come in at a lower and lower speed. The mil ...
2001 Chevrolet Suburban 1500 5.3L long crank VIN: 3GNFK16T91
We have what appears to be a fuel pump job. Before so, I just wanted to find out more about the subtleties of this diagnosis before pulling the trigger to better understand this problematic system. With guage attached at rail, and key turned on without startin... Trouble codes: U1301
2001 Chevrolet Cavalier Z24 2.4L MIL Lamp on VIN: 1G1JF12T51
Well good afternoon, have here a evap nightmare that I need help with! Car first came in MIL light on with code P0440 found purge solenoid to be bad so replaced purge and vent solenoid! code came back next day, smoke tested and found new vent solenoid to be st... Trouble codes: P0440 (evap leak)
2001 Chevrolet Suburban 1500 5.3L transfer case VIN: 3GNFK16T01
we are asking for imformation on the the 4wd transfer case operation on this vehicle.customer was informed by another shop that the front drive shaft is always turning even when 2hi is slected.we inspected and confirmed this.the vehicle hase a nvg 246 tranfer ...
2002 Chevrolet Trailblazer LS 4.2L Transfer case VIN: 1GNDT13S62
Customer was on a trip and stated the 2HI and 4WD lights started flashing and then stopped with no driveability symptoms. He had the vehicle checked out in Montana and the shop added 2 quarts (?!) of fluid to the transfer case and he said the vehicle "leaked" ...
2003 Chevrolet Silverado 2500 HD 6.6L Unknown VIN: 1GCHK23103
This vehicle has an intermittent squeal sound seems to be coming from under the truck while moving. sounds like a dry seal rubbing on a shaft. We have a 'Chassis ear' with 4 microphones placed in various places but are not able to hear where the noise comes fr...
2004 Chevrolet LUV 2.8L engine VIN: MPADR33X84
Hello fellow techs, I am currently in Iraq supporting our troops..I have inherited a 2004 "Chevy LUV". I am in desperate need of basic information...It is in reality an Isuzu pick-up (v-6/manual trans/4wd/4door). I cannot access ANY info for this vehicle...no...
1993 Oldsmobile Cutlass Supreme S 3.1L heater control VIN: 1G3WT34T4P
Need a heater control for a 1993 cutlass supreme. It is no longer available new or reman. Anyone know where I may locate one. Tried e bay and got a bad one that I had to modify just to make it fit in the dash. I was told it is 1993 only. Also it is electronic ...
2001 Oldsmobile Intrigue GL 3.5L Crossover tube VIN: H11F178326
We have this vehicle and the engine coolant crossover tube is leaking. Gaskets need replacement. We have never done this repair before. The repair would be staight forward if the exhaust crossover was not in the way. Here is the problem / question. Alldata giv...
1995 Pontiac Grand Prix GTP 3.4L timing belt or accessory belt VIN: 1G2WJ12X9S
One of our good customers came in with a complaint of belt noise. checked serpentine belt it was OK. After taking serpentine belt off the noise went away. So i took off the timing belt cover and found debri on the pulley's and cracked belt. After removing the ...
1998 Pontiac Grand Prix SE 3.8L Stall VIN: 1G2WJ52K2W
This car has a very interment stalling problem. The car will go without stalling somtimes for 3-4 weeks and somtimes will stall 5 times in one day. The stall always happens on a decell and the car always starts immediatly after stalling. Drove car with fuel pr...
1999 Pontiac Sunfire SE 2.2L Excessive Emissions VIN: 1G2JB5244X
hello my fellow techs i have this sunfire that is going no were.everything passes but nox under load.i scan this car and i get the egr code which could cuz the high nox p0405 exust gas recirculation valve sensor signal hlow.this car has no egr and i have check... Trouble codes: P0405 (exhust gas recirculation valve sensor signal low)
2000 Pontiac Grand Prix SE 3.8L Charging System
Sorry guys, this is my first post & forgot the VIN at work. We are the 3rd or 4th facility to look at this problem. Engine idles rough & misfires when hot. I have noticed that the voltage is low when this is occuring. I am assuming the driveability concerns ar...
1999 Saturn SC1 1.9L Misfire, MIL Lamp on VIN: 1G82P1286X
HELP iatn Saturn guys, Having problem with misfire== Code P0301 Cyl#1 misfire-- All ignition parts new & working-- Noted NO NOID signal to #1 Injector-- Anyone have this problem prior-- I AM leaning towards PCM --- any insight would be appreciated, Thanks in... Trouble codes: P0301
2003 Saturn Vue 2.2L code set for rad. fan VIN: 5GZCZ23D23
Rad. fan circuit seting PO481 code and fan seems to work normaly,cycles with temp and AC. Did flow chart test for PO480 since Alldata didn't have one for PO481. Swaped relays with no help. Did voltage test and relay cavitys have voltage with key off. Flow char...

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick Park Avenue 3.8L No Start VIN: 1G4CW52K8S
A large number of replies mentioned that the new harmonic balancer may be incorrect. These people failed to notice that in my original post I said that I had put the old one back on early in my diagnosis (it was changed due to the rubber part failing, not due...
1996 Chevrolet Caprice Classic 5.7L p0161 VIN: 1G1BL52P3T
Hello everyone and thanks for the input on this one. This code did in fact indicate a failure with the right rear oxygen sensor heater. I had looked at the connections and checked for power and ground to the sensor when i replaced the sensor. I found when i... Trouble codes: P0161 (Oxygen sensor heater circuit failure.).
1999 Chevrolet Cavalier 2.2L abs controler VIN: 1G1JC5243X
Thanks for the responces. We got this car back in today I was told the tone rings were ok. Those of you that said to ck for a cracked tone ring were right. The rt axle ring was broken. Someone may need to get there glasses adjusted. Thanks again for the...
2001 Chevrolet Prizm 1.8L blower motor VIN: 1Y1SK52841
Well we did not get a chance to fix this one but the customer informed us that it is fixed. The customer would not leave the vehicle for more than 1/2 a day and when we needed to gain access to wiring from the switch/control panel to resistor and motor that ma...
2003 Chevrolet Astro 4.3L Hesitation, Surge, Misfire, MIL Lamp on, LACKS POWER VIN: 1GNEL19X23
thank you all for for helping, each reply was very helpfull. the most improvement was made when delco plugs cap and rotor were installed, found #3 or 5 plug wire not fully seated, some other shop slid in some autolites. i removed the dist vent screans and mod... Trouble codes: P0101 (maf performance), P0300 (rendom missfire), C0221 (rf speed sensor open), C0223 (rf erratic sig), C0227 (lf erratic sig).
2004 Chevrolet Express 2500 4.8L Poor Idle Quality, Stall VIN: 1GCGG25V04
The throttle body was defective put another new one in & that solve the problem
1995 GMC Jimmy SL 4.3L rear diff noise VIN: 1GKCT18W3S
Hello everyone and thanks for the help on this one. We recieved several great replies and a couple of them hit it on the head. We put the cover back on and drove it. We found that the noise occurred in first but went away in 2nd. We tore down the tranny an...
1998 GMC Jimmy SL 4.3L heater VIN: 1GKCS13W7W
I have not fixed this truck. I did perform almost all of the fixes that were sugested. Some of them 2-3 times. When it came down to doing things, like replacing the heater core, at big bucks, the customer pulled the plug. I guess, I would not want to spend tha...
1991 Pontiac Grand Prix SE 3.4L No Start VIN: 1G2WJ14X2M
Found alarm relays under dash, apparently when in crank mode would rob voltage from ecm.remove relays car starts fine. Thank all of you for your input
2000 Pontiac Bonneville SSEi 3.8L steering shaft VIN: 1G2HZ5410Y
Thanks to all who replied. Each and every reply was excellent and helped convince my customer that we were on the right track. I found out that this noise has been there for over a year. I sprayed the shaft heavily with spray grease and this stopped the noise ...
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