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Prev Professional Automotive Repair Technical Discussions for May 4, 2007
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Open Help Requests for GM
Help Request Answers
1992 Buick Roadmaster Limited 5.7L Electronic VIN: 1G4BT5378N
well its friday with another problem child. the problem is at that the ac goes from auto to economy mode only when the wheels turn .i have checked the ac charge and cut the light blue wire under dash. it makes no sense to me why it does it only when the car is...
1994 Chevrolet K2500 Suburban 6.5L Stall VIN: 1GNGK26FOR
Hey Boys, this is my daily driver/tow rig/family truckster. Around Christmas time the check engine light came on, o great! I have not had time to check it out and it seemed to run fine. I am even busier now with deadlines hanging over my head from several favo... Trouble codes: 35 (long inj pulse), 36 (short inj pulse), 29 (glow plug relay problem)
1998 Chevrolet Cavalier 2.2L diagnostic VIN: 161JF52T7W
this vehicle came in with a ABS light on. Hooked up MODIS diag computer from snap on and go no communication. Checked for engine codes and data and the modis reported that there was data missing from the page. was not able to communicate with any modules. This...
1999 Chevrolet Silverado 1500 5.3L mode VIN: 2GCEK19T3X
Greetings fellow techs, Got a 1999 Chevrolet K1500 Pick-up in the shop today that won't switch modes on the heater/air conditioner. Most all of the air is coming out of the dash ducts. Several months ago we replaced the HVAC Module per the service bulletin we ...
2002 Chevrolet Tahoe LS 5.3L compressor belt and tensioner VIN: 1GNEK13Z42
Customer came in w/ broken compressor belt tensioner. Replaced tensioner w/ Goodyear brand part, belt looked fairly new=reused old belt. Next day customer returned w/complaint of rattle coming from tensioner. Thought possible stretched out belt=new gates belt ...
2004 Chevrolet Suburban 1500 LS 5.3L belts VIN: 3GNEC16Z64
hello, My customer complains about a belt squeal on cold start up.I have heard it but it quit so fast I couldn't diagnose. I know GM has TSB's on the AC compressor in 01 and 02 but alldata does not show this tsb for my year.This customer is a perfectionist and...
2000 GMC Savana 2500 5.0L steering box/pump VIN: 1GTFG25M9Y
customer came in complaining of hard steering,especially when parking found power steering pump slightly noisy and replaced condition did not change according to my tech it would intermittently get hard especially when parking and would feel harder going to th...
2001 GMC Sierra 2500 HD SL 6.0L Brakes VIN: 1GTHK29V41
The front brakes on this truck will intermittently apply by themselves. Not quite to the point of locking, but enough that it will leave you stranded on a test drive (co-worker walked for an hour back to the shop yesterday). Cracked front lines on master cylin...
2001 GMC Sierra 1500 HD SLE 6.0L drivetrain VIN: 2GTEK69U31
hi, i have a personal 2001 gmc sierra c3 awd pickup [same as awd denali drivetrain] that i just recently bought. after i drive approx. 20 miles and the drivetrain warms up, if i go to turn into a parking space, it will jerk and knock underneath like it is in 4...
1994 Pontiac Grand Prix SE 3.1L Excessive Emissions, No Start, Poor Idle Quality, Cuts out, Stall VIN: 1G2WJ52M1R
Hi All, thanks in advance for taking the time. Customer complaint is vehicle cuts out at stops and after start when put into gear also smells fuely. I verified customer complaint. when engine starts it sometimes starts and stalls but when stays running it idle...
1995 Pontiac Grand Am SE 2.3L Excessive Emissions, Poor Idle Quality, Hesitation VIN: 1G2NE55D7S
I seem to be missing the obvious here, so a little help is needed. On cold/warm startup runs fine. Once gets up to operating temp, runs very rich, smokes, hesitates. Can watch fuel trim numbers go down in a hurry once closed loop.(integrator has gone down unde... Trouble codes: 65 (Injector error)
1999 Saturn SL2 1.9L steering wheel cabin area VIN: 1G8ZK5274X
This saturn exhibits a vibration from 45 MPH upwards on seemingly most road conditions. Customer says it varys from slight to a very noticable shake in the front end area. it shakes the steering wheel and most of the car. Shifting to Neutral and braking seem t...

Fixes & Summaries for GM
Fix/Summary Answers
1987 Buick Riviera Luxury 3.8L Excessive Emissions VIN: 1G4EZ1139H
Hey All,We installed a faulty CARDONE reman unit in this car.Don't really have much choice with a car this old.Anyway installed another reman unit and all is well.To Victoria from B.C. as I mentioned in my posting'CAR HAD FUEL CONTROL'.Do appreciate the input ... Trouble codes: 55 (ecm failure).
1993 Buick LeSabre Limited 3.8L Poor Idle Quality, Surge, Cuts out VIN: 1G4HR53LXP
thanks for all the replies,ended up being a bad intake valve on number 6 cyl,we could back off of that valve with it running and get it to smoothout and run great,sent heads off for valve job.very strange valve job on a motor with less than 50000 miles i guess...
1995 Buick Riviera 3.8L alternator VIN: 1G4GD2210S
thankyou all for your help. it turns out the positive battery terminal lead had lots of corrosion. we cleaned & all is ok. thanks for all of your help!
1995 Buick LeSabre Custom 3.8L Coolant Temp Reading VIN: 1G4HP52L1S
Thanks to all who responded. Two things were done to vehicle to fix problem. In help request, we had said we tried new PCM and didn't fix, so at that time we put old PCM back in. Next step, we completely bypassed yellow wire from coolant temp sensor to PCM. Cu...
2003 Buick Century Custom 3.1L rocker arm threads VIN: 2G4WS52J23
A BIG THANK YOU to Grant [...]. the torque spec for the 2003 3.1 is 24 ft lbs, not 14 ft lbs +30%. Document #898284 shows the proper torque. notified alldata of correction, weather it happens or not??? We goodwilled the repair- replaced all of the rocker thre...
1980 Cadillac Seville 5.7L Poor Fuel Economy VIN: 6S698AE690
thanx for all the replies, the problem was the ecm, thwe first one we got was bad, the second time didm the trick!!!
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L Drive-axles VIN: 1G1YY23P4P
All replies said it is a bad u-joint or possible bearing. As a school we do not work on many Vettes (like one every ten years)and wanted to make sure we were headed in the right direction. Thanks for everyones help.
2002 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 1GNDT13S22
I just wanted to thank everyone who responded. The vehicle is now repaired. It took along time because we had a lot of other things on our table. It is one of our busy seasons. So out of the 12 responses, Craig from Oklahoma said that he had had 2 Trailblaze... Trouble codes: P0105 (Manifold Absolute Pressure System Performance), P0130 (HO2S Circuit Bank 1 Sensor 1), P0304 (Misfire Cyl 4), P0300 (Random misfire).
2005 Chevrolet Classic 2.2L air conditioning VIN: 1G1ND52F45
found a plugged orifice tube and a broken pressure switch as well. cleaned orifice tube and rteplaced switch all OK now thanks for all the help.
1996 Pontiac Grand Am SE 3.1L Injector Pulse VIN: 1G2NE52M2T
Thank You All For The Help. Tim In WI, Thanks. Air Bag Module Under Pass. Seat Corroded Badly. Disconnected Module And Car Started Every Time And All Lights & Guages Went Normal. Replace Module With A Used Unit (Because New Is Expensive) And All Is Well.
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