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Prev Professional Automotive Repair Technical Discussions for August 11, 2006
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Open Help Requests for GM
Help Request Answers
1994 Chevrolet S10 Blazer 4.3L Excessive Emissions, Poor Idle Quality, Surge, BLACK SMOKE VIN: 13NUO12W1R
HI ALL History: Replace fuel pump (for long cold start) back in first part of July this year. 2 weeks later customer comes back with runs rough symptom, had a code for EGR and signs of EGR stuck open (rough running, black smoke, bad smell).Replaced EGR valve ...
2003 Chevrolet Express 3500 6.0L Poor Idle Quality VIN: 1GBJG31U73
we had this truck come in idling very high. we check codes and cleared. truck after clearing codes idle at correct rpm. turned truck to customer. drove a week or two. ran ok. then started back with hi-idle. check with gm and was told that this truck was having... Trouble codes: P0507
2005 Chevrolet Silverado 3500 6.6L blower VIN: 1GBHK39205
I was wondering if anyone can shed some light on this issue that we have had on this truck and 2-3 other trucks just like it that I service. We are experiencing inop blower speeds caused by burnt harness plugs at the blower motor resistor relay unit. I have a ...
2005 Chevrolet Aveo LS 1.6L pads VIN: KLITD62604
This silly little thing came in for a brake inspection. I removed all four wheels and found the brakes to be in like-new condition. However, when the brakes are applied at 55 mph +/-, there is an terrible noise coming out of the front. Sounds like a bearing go...
2003 Other GM Bus 5.9L MIL Lamp on VIN: 4UZAAXBW83
Bus was brought in with complaint of ck engine light on,and accelerator pedal seems to not respond at all when light is on. If you back off the pedal light goes out in 5 or 10 seconds and throttle response is normal. It has a potentiometer at the pedal.Tested ... Trouble codes: 051 (sid from international scan tool)
1994 Pontiac Grand Am SE 3.1L high idle at times VIN: 1GZNE15M0R
vehicle came in with intermitent high idle found multiple codes in system (code #'s are 22,28,35,54,75,76,77,82). we cleaned carbon deposits from the idle air control motor. (no change) Checked grounds at transmision that normaly brake on this type of vehicle,... Trouble codes: 22 (tps circuit signal voltage low), 28 (trans range switch error), 35 (idle speed error), 54 (fuel pump circuit low voltage), 7577, 82 (igntion control 3x signal error)
1997 Pontiac Firebird Formula 5.7L No Start VIN: 2G2FV22P5V
According to the customer, it died while he was inside the house. Cranks with no start, slight pop from exhaust on each cylinder. First thoughts are water in the dist. cap from water pump. Checking fire, it's hot at the plugs. Watching compression gauge and sp... Trouble codes: 161 (o2 heater), 420 (cat converter), 1661 (mil problem)
1996 Saturn SL2 1.9L a.c, wipers, radio intermitantly inoperative VIN: 1G8ZK5273T
intermitant inoperation of the a.c., wipers and radio. customer also had a hard time shutting key off. never reoccured.

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Park Avenue Ultra 3.8L alternator VIN: 1G4CU5313P
thanks to all that replied. we had already check voltage drops before posting but thanks for the reminder. sometimes its the overlooked or skipped steps that bite you. special thanks to joseph from rhode island. the tsb #53-64-01-(mar 2,1995) for the 140 amp a...
2000 Buick LeSabre Custom 3.8L Performance VIN: IG4HP54K1Y
First off I would like to thank every one that took time to help. The problem was low state of charge. Not sure why other than I will ck my scales. After putting the box back in we recharged it and it was now 18 degrees, better but still not good enough. Some ...
1994 Chevrolet Corvette 5.7L Poor Idle Quality, Stall VIN: 1G1YY22F7R
ECM was not controlling IAC...Replaced ECM...Now IAC doing what is supposed to...ok now...Thanks
1998 Chevrolet Malibu 2.4L Mechanical VIN: 1G1ND52T7W
Thanks very much to all 8 of you techs which offered advice. We did a leak test on the cylinders with lower compression and found that we were leaking compression through the exhaust valves. The engine was on time so we got the customers approval for a complet...
1999 Chevrolet Malibu 3.1L MIL Lamp on VIN: 1G1ND52J0X
My tests showed the air valves should hold vaccum and the one thats in the car does not but customer did not want to fix it.I dont under stand why they bring it in for diagnosis but no repair. Trouble codes: P0410.
1999 Chevrolet Malibu LS 3.1L multiple VIN: 1G1NE52J0X
well i would like to buy all 12 of my 'brothers in grime' a cold one for the fast and insightful help on the multiple codes about 90% of you said the harness were the issue(correct as usual) alot mentioned gm sells repair kits but 1 tech had a less expensive w...
2001 Chevrolet Tahoe 5.3L Starting VIN: 1GNEC13T01
Thank you for all your help. Several suggestions were to suspect aftermarket accesories, and that was indeed the problem. The reason it took so long to figure out, is that the customer has owned the vehicle since new and never had this problem. He never had an...
2001 Chevrolet Express 3500 5.7L hydro boost VIN: 1GAHG39R31
Thanks for the good information. I learned that the problem can be caused by something stuck in the booster unit or by a problem in the pump or the pressure valve in the pump. I decided to take the belt off and turn the pump by hand and see if it felt ok befor...
1998 Oldsmobile Aurora 4.0L No Start, irratic systems VIN: 1G3GR62CXW
This one is down the road!!! Turns Out most of the replies were correct! It was a ground problem. Bizarre enough it was a ground that I had already checked and cleaned but the real problem was in the bolt that the ground was 'stacked' on. It was the major grou... Trouble codes: P0603, P1602, P1603, P1604, P1605.
2002 Oldsmobile Bravada 4.2L Electronic VIN: 1GHDT13S72
Thanks to those who replied. It turns out we have a generic communication glitch in one of the modules, and the condition is very intermittant. I have not seen my customer since 2nd code clearing. I suspect he may have traded the vehicle in somewhere and passe...
1989 Other GM capri 3.0L No Start VIN: BL3C38CXK9
thank you for the help. the igntion kill swith on the shift cable was the problem, the cam is not returning to center, I have cleaned, lubed, and adjusted, I just am not able to make it consistently work right, but now I know what the problem is, and that is 9...
1997 Pontiac Grand Am SE 2.4L Hesitation, Surge, MIL Lamp on VIN: 1G2NE52T6V
Based on the results of the test & the 2 replies I received, the idea of a faulty PCM seemed to be the most likely. After replacing the PCM, I checked the EGR & TPS +5V circuit and to my dismay, I found a similar behavior as with the old PCM. I started the eng... Trouble codes: P0121 (TP sensor problem), P0404 (EGR feedback signal out of range), P1404 (EGR-2 position error/EGR closed perf).
1996 Saturn SL1 1.9L Poor Fuel Economy, MIL Lamp on VIN: 1G8ZG5280T
Thanks for all the help. We received 27 replies. They ranged from coolant temperature sensor, to vacuum leaks, to catalytic convertor faults. The majority of the replies indicated that the coolant temperature sensor could skew fuel trim readings even if readin... Trouble codes: P0172 (System too rich).
1996 Saturn SL1 1.9L Excessive Emissions VIN: 1G8ZG5289T
o.k. guys,, this one is fixed.. everybody was harping on the temp senser and connector, for very good reason... its a common problem, i know. but the temp always matched with thermometer and ecm reading so we knew it was reading correct.. we pulled injector ra... Trouble codes: 656 (fuel level sensor), 132 (high voltage on oxygen sensor).
1999 Saturn SL2 1.9L Misfire VIN: 1G8ZJ5270X
I really want to say thank you for all the replies. The whole problem was broken valve spring on # 1 cyl. thanks again guys. Especial Thanks to Dan. :-) Trouble codes: P0301 (cyl one misfire).
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