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Prev Professional Automotive Repair Technical Discussions for October 15, 2007
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Open Help Requests for GM
Help Request Answers
1992 Buick LeSabre Custom 3.8L starts and quits VIN: 1G4HP53LSN
This starting problem has been going on for about 6 months. every time we get there the car starts. We finaly caught it not starting. It starts and quits like a security sys problem. when it did not start the security light stayed on. and of corse it is starti...
1999 Cadillac DeVille 4.6L a/c clutch VIN: 1G6KD54Y5X
hey caddy gurus, this one came from another shop. they cannot get the a/c clutch to engage. it will only engage if the a/c control relay is grounded (circuit 459 dark green/white). the system has the correct amount of freon in it. they put new gm pcm and a/c m...
1997 Chevrolet Venture LS 3.4L Poor Idle Quality, Misfire VIN: 1GNDX03EXV
Vehicle came in running bad with a coolant leak in the lwr intake. I replaced the intake gaskets rockers and pushrods. No more coolant leak, but it still runs rough at idle. I smoked the system and can't find any leaks. Under a load It runs good, but idles ver... Trouble codes: P0121
1999 Chevrolet S10 LS 4.3L lifters VIN: 1GCCS1941X
probably should have written for advice before repair.vehicle brought in with lifter roller seized and camshaft damaged,replaced cam and affected lifter.customer only wanted minimum done due to cost. now the vehicle has either another noisey lifter or the one ...
2002 Chevrolet Malibu 3.1L Battery light VIN: 1G1ND52J72
Vehicle originally came in with a no crank caused by a dead battery. Replaced battery and everything checked out good in the charging system. Vechicle came back with the complaint of the battery light coming on intermittently. Testing the charging system revea...
2003 Chevrolet Suburban 1500 LS 5.3L Transfer case VIN: 3GNFK16T03
I have a problem with the 4 WD/AWD lights do not come on the can not shift into 4 wheel drive. Performed Service Bulletin # 02-04-21-006D to wake up transfer case control module. Did not solve problem. Tried new transfer case control module and switches, still...
2005 Chevrolet Classic 2.2L engine VIN: 1G1ND52F55
Hello,I have a malibu that vibrates in reverse only,nuetral and drive are fine. I have replaced the front trans. mount ,the one that is loaded in reverse,and I still have the vibration I have also tried to isolate the problem by moving hoses and wire harnesses...
2004 GMC Sierra 1500 SLE 4.8L Suspension VIN: 1GTEK14V54
On this unit, you can feel "something" in the steering wheel while cornering, even on smooth roads.Drives straight, no wandering, etc. Front has been checked, on the floor. I don't have an alignment rack here. Everything appears tight. Front control arm bumper...
2002 Oldsmobile Aurora 4.0L radio VIN: 1G3GS64C52
hi everyone. Thanks to all who respond. The battery in this car was disconnected without a backup supply. The dealer is being greedy with a code. Does anyone know how to unlock the radio?
1991 Pontiac Firebird Trans Am 5.0L hard start VIN: 1G2FW23F4M
we replace the engine on this pontiac about a year and a half ago. cust brought back shortly after with a compliant of hard start some times when cold and some times shortly after a hot soak. we kept car for about a week and it did have a hard starting problem...
2007 Saturn Outlook XE 3.6L air bag light
had code boo52 deployment commanded and would not clear, had air bag problem message on instrument cluster and air bag red light on. replaced silver air bag computer under center consol and now the message on instrument cluster is gone, red air bag light is on...

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick Skylark 2.5L Cuts out, Misfire, BACKFIRE VIN: 1G4NV14U2M
Thanks to all that replied. Everyone had good ideas on this one. First I went back and did a cyl leak down test whitch all cyl's passed with less than 25%-30% leakage.I also ran a wet comp test although the results were slightly higher I ruled out a leaking...
1992 Cadillac DeVille 4.9L rpm VIN: 1G6CD53B3N
Thanks for all the replies, one reply from Mark in LA helped us repair this cadillac. The following is a cut and paste of his reply. Thanks again everybody. With ISC backed away from throttle lever, adjust the TPS to .55v with the throttle closed. Clear any...
1998 Cadillac DeVille 4.6L Theft System Problem VIN: 1G6KD54Y2W
Thanks to all who replied, it was a broken wire from the lock cylinder. It threw me off because the vehicle always started. Customer approved soldering a resistor into the wiring.
1984 Chevrolet El Camino 5.0L water pump VIN: 1GMDX1F72J
Thanks to all who took their time to reply! my initial intention was to remove it, but after a few whacks with a hammer and punch it did not budge or even dent. It is not inset like a freeze plug, it is actually flush with the block and appears to be as hard a...
1994 Chevrolet K1500 Suburban Silverado 5.7L abs module VIN: 1GNFK16K1R
Cleaning the ground for the ABS modual has fixed the problem
1998 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 2GCEK19R3W
I thank every one for their help on this interminent no start. I found that the capacitors in the Security harness from the key to the Theft module were what was causing the problem. Those two capacitors are located adjacent to the key switch in the column and...
2000 Chevrolet Express 1500 5.7L No Start VIN: 1GBFG1SR6Y
2003 Chevrolet Suburban 1500 LS 5.3L electrical system VIN: 3GNFK16Z63
forgot all about this one,we installed a new ignition switch and told the drive it and let us know.we have not heard [...] from him.he is a good cust. and he would have called by now if there was a problem so we call it a fix.thanks for the help.
1992 GMC Sonoma SLE 4.3L No Start, Cuts out VIN: 1GTCS14W4N
Thank you to all that responded, especially James from Wisconsin, Tony from Minnisota, and Fred from British Columbia. Like I mentioned on my update I found some wires rubbed behind the head on passenger side that were trapped when motor was installed. Removed...
1995 GMC Jimmy SL 4.3L Safety VIN: 1GKCT18WXS
I got the turn siganal switch in this GMC, I removed the steering wheel. Not a difficult job at all. Thanks to all 18 techs that replied!
1996 GMC Safari SLE 4.3L Hesitation, Misfire VIN: 1GKDM19W0T
tanks to all the guys that reply me I haven't fix this problem and I tried all your sugestions, no solved problem costumer scraped vehicle.
1998 GMC K2500 Sierra SL 5.7L Poor Fuel Economy VIN: NONE VINR
I am very greatfull to all of you who shared ideas on this problem with me all checks properly at this time .what i wanted to know is what came first the chicken or the egg. A new knock sensor and lifters together solved my problem acording to the shop , but ...
1994 Pontiac Bonneville SSE 3.8L No Start VIN: 1G2HZ5218R
Found that after checking all of the things that you guys sugested that I ended up putting a used computer in and it took car of it. So I took the prom out of the salvage yard computer and put it back in the other new one I got and that one work also. So in ...
1995 Pontiac Trans Sport 3.8L poor power VIN: 1GMDV06L8S
Thanks for your tremendous replies. Gerry from Michigan hit it, bang on. The knock sensor was reading a false signal, thereby retarding timing and opening the EGR valve. Only happened warm due to closed loop. Faulty sensor did not trigger a code though. Thanks...
2001 Pontiac Grand Am SE 2.4L Poor Idle Quality, MIL Lamp on VIN: 1G2NF52T61
Well it fixed and I'm sure it was the ground at the drivers fender that was the problem in the first place, we did not do a voltage drop test and should have on the sensor ground. This may or may not have shown up as it may have been making contact while we t... Trouble codes: P0122 (tp sensor circuit low voltage), P0133 (os2 slow response sensor1).
2001 Saturn SC1 1.9L Misfire, MIL Lamp on VIN: 1G8ZN12801
thanks for the tips on this car - the problem ended up being the new ignition module was defective. after double & triple checkng every thing . decided it had to be module still. replaced again and car runs great with no misfires or mil. thanks for your assist... Trouble codes: P0300.
2002 Saturn SL2 1.9L No Start VIN: 1G8ZK52782
I want to thank James [...] Cubbin for their reply to my problem. What I found out from them is a Saturn can only be programed by using the passthru method. They were right, when I reprogramed the computer by hooking my tech 2 up to the computer and...
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