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Prev Professional Automotive Repair Technical Discussions for April 3, 2008
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Open Help Requests for GM
Help Request Answers
1988 Chevrolet G20 Chevy Van 5.7L head lamps VIN: 1GACC35K2J
towed in, has sat for a couple of months. tested and found the batt and alt bad. replaced both. turn on head lamps and engine died. called customer and was informed that it had started that before the alt went bad. alt is working as designed now. head lamp swi...
1989 Chevrolet C1500 Cheyenne 5.0L Excessive Emissions, Misfire VIN: 2GTEC19H0K
mutipul discharge of ign random times will fill scope screen with patterns over ranges tac on scope problem not aparent with timing connecter disconected have tried diferent dist (ac delco ) different computer can find no signal to match multipul discharg of i...
1995 Chevrolet Lumina APV 3.8L No Start VIN: 1GNDU06L7S
We have been scratching our heads for two days on this one,any help would be great so thanx ahead of time. So we have lumina apv van that came in on the hook a few days ago, we have good spark but no injector pulse,we installed new cam and crank sensors,reman ...
2001 Chevrolet Silverado 1500 5.3L transfer case VIN: 2GCEK19T41
The transfer case in locked in low range, light on dash shows service 4wd, diagnostic showed no code errors, I can not get it to come out of low range. I'm not that familiar with this push button system, any suggestions?
2002 Chevrolet Astro 4.3L steering column VIN: 1GCDM19X52
Hi Chevy guys, We have an intermittent squeak or vibration coming from the steering wheel. It sounds like taking a plastic pull tie and pulling it tight ( that ratchiting noise the teeth on the pull tie makes when you pill it. We pulled back the the rubber bo...
2002 Chevrolet Cavalier 2.2L Rear Brakes
Hi, all. I have been racking my brain trying to figure this one out and i have had no success, so hopefully someone has seen this before. A customer came in needing rear brakes because they were getting worn low. I replaced the drums and shoes and sent him on ...
2004 Chevrolet Silverado 1500 4.3L No Start, Cuts out, Stall VIN: 1GCEC14X74
This truck was towed in. It did not start. I let it sit in the shop for an hour and it started. It will randomly shut off like someone turned the key. Sometimes seconds after starting, and sometimes 2 hours later. It will almost always fire right back up. Appa...
2005 Chevrolet Optra 2.0L MIL Lamp on VIN: KL1JK59Z75
No information (vehicle does not exist)on MOD5 or Alldata and nothing posted on IATN or Identifix also. Help!! Trouble codes: 0700 (trans control system), 1884 (manufactuer specific)
2005 Chevrolet Monte Carlo LS 3.4L Poor Idle Quality, Surge VIN: 2G1WW12E95
This car came in with an erratic idle. It varies beteewn 690 - 1500 rpm in park. I substituted a new map sensor but it did the same thing. As the idle climbs the iac counts also climb. I noticed the evap sol, at idle, is 18% and climbs to 25% at the same time ...
1991 GMC Pickup C3500 5.7L speedometer
ok guys, this is our wrecker for our shop and the other day i left the shop to go tow a car and the speedometer just quit working at about 40 mph. about 2 miles down the road it sit the mil light so i hooked on to the car and came back to the shop and scanned ...
1990 Oldsmobile Silhouette 3.1L Cuts out VIN: 1GHCU06D4L
I know you all are going to think I am crazy and/or stupid but here goes. This Olds came in on a hook. Customer stated it lost power on the freeway. We found the original catalytic converter melted down. With the high miles we replaced the converter and did so...
1999 Oldsmobile Bravada 4.3L air bag system VIN: 1GHDT13W8X
Code B0026, front/driver frontal deployment loop open. I have visually inspected the front end, does not appear to have been in a collision, and both front sensors appear to be okay (at least visually). Owner is unaware of the history of the auto. I have not s...
1994 Pontiac Bonneville SE 3.8L security VIN: 1G2HX52L1R
engine will not crank security light stays on even with key off sometimes disconnecting battery and reconneting makes engine crank and run If that won't work letting the car sit with the battery connected makes the car start and run The first occurance was 5 m...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Cadillac DeVille d'Elegance 4.6L abs VIN: 1G6KE54Y3V
The fix for this Caddy was replacing the two L/R WSS wires from the harness connector at the rear WSS connector harness to the ECU connector. We noticed that from time to time, we would get a good bit of hash on our L/R sensor back probed at the ECU. The circ...
1996 Chevrolet Tahoe LS 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GNEK13R6T
First, thanks to everyone who responded, I had lots of good replies. Seemed like the majority was pointing at the fuel press regulator and several to the injectors. For all of you who said the pressure regulator, you were correct! Removed throttle body and ... Trouble codes: P0161, P0300.
1998 Chevrolet Blazer 4.3L Transfer case, Differential VIN: 1GNDT13W1W
Amazing reply's to this post! Want to thank everyone for their idea's!! Checked to make sure front and rear differentials are the same gears by marking the pinion flange to the diff. case and the inside of both wheels to the control arm. By turning both whee...
2000 Chevrolet Silverado 1500 5.3L abs VIN: 2GCEK19TXY
Well, we haven't seen this vehicle back for close to a month now. After checking all that was suggested, the only thing we could find was a low tire on the rear. Not sure if this contributed, but I guess no news is good news? Thanks for all the help
2002 Chevrolet Express 3500 5.7L brake lights VIN: 1GCHG39R52
1999 GMC C1500 Suburban 5.7L No Start VIN: 3GKEC16R4X
Hey guys , I believe i got this one fixed. I did replaced the distributor cap and plugs with a GM part. Then i also replaced the distributor with a used GM from a junk yard. I felt like there might have been a little play in it and plus a little concern for th...
2002 GMC Sonoma SL 2.2L No Start VIN: 1GTCS14552
Most of you agreed one way or another with me on my diagnosis. the customer has not called me back to finish this repair yet. They have no money, I guess yet. But, if he calls I will replace the coils, module and crank sensor, since the mileage is high an...
2002 Pontiac Grand Prix GTP 3.8L egr low efficincy VIN: 1G2WR52132
well we finally got it going, after we replaced the egr(the third one) we replaced the map sensor and retested and it failed i then ran a new vacume hose from the intake to the map sensor and retested and it passed. i then removed the new egr and it failed, th... Trouble codes: P0401.
2000 Saturn SL1 1.9L Fails readiness moni VIN: 1G8ZH5287Y
Well again i will say thanks to all who replied. James got me thinking this morning @ 6am, and Paul hit the "NAIL ON THE HEAD" ! With scan tool CTS showed 9 deg, IAT showed 25 deg, My thinking they should be very close to the same with outside temp @ 27 deg. I...
2001 Saturn SC1 1.9L high idle VIN: 1G8ZN12801
Thanks to all that replied, the fix for this Saturn was the TPS. We double checked all possible vacuum leaks at the intake manifold, TBI, and all related hoses. The high idle would only happen when the vehicle was coming to a stop after driving 45mph+. We inst... Trouble codes: P0122 (TP sensor circuit low voltage), P0507 (idle speed high), P1599 (engine stall).
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