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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 27, 2005
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Open Help Requests for GM
Help Request Answers
1999 Buick LeSabre Custom 3.8L No Start, Stall VIN: 1G4HP52K9X
Greeting all.Have a 99 Lesabre that has a intermittant no-start.We are ready to set fire to it very soon.On the no start, We will lose injector pulse and spark.Have good fuel pressure when the no start happens. After reviewing the database, We did find the fue...
1999 Buick Century Custom 3.1L transmission VIN: 2G4WS52M8X
I have a 99 century with a 3.1 and a 4t60e trans.It has a whining noise coming from the trans.You can hear it from 1st than 2nd and into 3rd. most noticeable going at slow speed.Stopped and in drive or reverse you can't hear it.Put in park or neutral you have ...
1999 Buick Regal LS 3.8L MIL Lamp on VIN: 2G4WB52K0X
I hope someone has seen this before we have been screwing with this for about 3 days now. Vehicle came in with code po171 and both LTFT and STFT peg at full rich compensation +16.4 LT and +20 ST. Found the O Ring under the PCV missing and replaced it. The STFT... Trouble codes: P0171
1997 Cadillac Catera 3.0L Misfire VIN: WO6VR54R1V
Sometimes, not all the time this vehicle will have a hard skip when started cold. It may take days for the car to skip when started. It lasts until you can get the hood open and the vehicle runs fine after. Road test the vehicle and it runs great. We were able... Trouble codes: P0306 (cylinder number 6 misfire)
1998 Cadillac DeVille 4.6L Cruise control VIN: 1G6KD54Y1W
Thanks for your time to read my post. This Caddy is a salesmans car that he just bought. The problem is while he is driving, with the cruise control on, after comming to a stop the cruise will not reengage. He then found the 20amp fuse for the stop lights was ...
1998 Cadillac Catera 3.0L po1870 VIN: W06VR52R3W
Hey guys hope you can help. I have a 98 Cadillac Catera that drives normally for 70 or 80 miles,shift speeds and quility good, and around that time failsafes in 4th gear when coasting to a stop.We scanned the car and found an 1870 code. We know this is a tcc r...
1994 Chevrolet Camaro Z28 5.7L Miss/Backfire VIN: 2G1FP22P7R
Hello everyone and help..this one is making me grayer. I have this LT1 in for a misfire/backfire once its warmed up. If you give it moderate throttle at anytime after warmed up, it backfires miserably out the tailpipes and intake. The usual secondary igntion ...
1995 Chevrolet Lumina LS 3.1L No Start VIN: 2G1WN52MDS
hey guys, this vehicle has me stumped. it came into the shop on tow hook. customer had driven car over 20 miles with temp gauge over red line. did coolant system leak check and that head gaskets were blown. remove heads and had them resurfaced. reassembled eng...
1997 Chevrolet S10 LS 4.3L speedo and transmission shifting VIN: 1GCDT19X2V
Hear is another vehicle that has been everywhere and no one could fix it. Thanks in advance for any help anyone could provide. I have done all the easy stuff like check fuses and fusable links. The truck runs perfect except fot the fact that the trans doesn't ...
1997 Chevrolet Astro 4.3L Misfire VIN: 1GNDM19W6V
This Van has been sitting for monthes. It started missing real bad and cust parked it.Cust has a code reader and found cyl 5 miss code and bank 1 cat efficientcy low. Cust now wants to fix it ,He replaced plugs cap and rotor but is still getting a miss so he g... Trouble codes: P0305
1999 Chevrolet Blazer 4.3L four wheel drive VIN: 1GNDT13W5X
four wheel drive will not disengage light on switch goes out
1999 Chevrolet S10 LS 4.3L No Start, Stall VIN: 1GCCS19X8X
Techs, Have another start and then stall, Cannot communicate with vehicle at all to retrieve any possible codes checked DLC for both grounds and B+, with key in the on position I have 8v at #2 pin serial data line and 5v at pin #9 serial data Uart line, The se...
2000 Chevrolet Silverado 1500 5.3L battery drai VIN: 1GCEK19T6Y
pickup has enough drain to kill the battery in 2 days. no lights are on. we pulled fuses until the drain is gone but no fuse was the main draw. we pulled the rap fuse and that didn't make a difference and when we pulled power at the distribution box our drain ...
2001 Chevrolet Silverado 1500 5.3L gauge/light VIN: 2GCEK19T71
truck came in with gauge fluctating and charging system light coming on, we found the charging system was putting out 80 amps at idle with no load, we replaced alternator with factory acdelco part thinking we had a stuck regulator, no change in problem all con...
2002 Chevrolet Avalanche 1500 5.3L Tach, gauges, and driver alert system VIN: 3GNEK13TS2
Greetings GM master gurus, please pull us from the fire. The truck came in with basically no cluster operation. Fuel level fixed at 3/4, no tach, volt, temp, or o/p readings. Intermittently the cluster would come to life, most often by playing with the key. Sa...
2003 Chevrolet Avalanche 1500 North Face 5.3L powersteering VIN: 3GNEK13T83
Hello group and thanks for your time, This vehicle came to us with a whining power steering pump, full of fluid and no steering assist. We replaced the pump and found all problems resolved except for very little steering assist at idle speeds. Once you increa...
1995 GMC C3500 Sierra SLE 6.5L Poor Fuel Economy, gutless VIN: 1GDKC34F5S
Hi ,we have a 95 GMC ramp truck that seems to enjoy eating computers.It had a check engine light on a while ago (year)for wastegate solenoid problem, I checked the connector and found good 12V supply but no ground from the PCM.The wiring checked out good as di... Trouble codes: 78 (wastegate solenoid problem)
1997 Oldsmobile Aurora 4.0L Stall VIN: 1G3GR62C8V
when the car is cold it starts to bogg down then dies but not often. got it in the shop and hooked it up to genysis and checked datastream nothing. car ran for about an hour and after it got hot anytime i put it in drive with brake on about 5 to 10 seconds lat...
2000 Oldsmobile Bravada 4.3L Hesitation, MIL Lamp on VIN: 1GHDT13W7Y
this vehicle came in for inop fuel gauge, stuck in middle. grounded circuit and the gauge pegs. told customer it was the sending unit. she returned the next day saying her check engine light came on after leaving shop. checked codes and got codes p0102 mass ai... Trouble codes: P0102 (mass air flow sensor voltage too low), P0340 (no cmp signal)
1995 Pontiac Sunfire SE 2.2L rear brakes VIN: 1G2JB5245S
This car came to us this morning. The customer stated that the rear brakes lock up. I test drove the car with the brakes lightly applied the rear brakes locked solid! I disconnected the ABS controller buy removing the relay and re-drove same problem. I then ha...
2001 Pontiac Sunfire SE 2.2L No Start VIN: 3G2JB12461
This thing is starting to hont me . It come in via tow truck with a no start . Sat there for a couple of days until we got a chance to look at it .When we finelly got a chance to look at it it started right up . Customer couldn't trust it so she left it with u...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Century Limited 3.1L Magnasteer VIN: 2G4WY55J02
This one got ugly. The flow charts, as usual, can lead you to either condemn the rack or the EBCM, depending how you interpret the testing results. I decided to replace the rack because of the drop-outs I saw during a resistence sweep test of the VES solenoi...
1996 Cadillac Fleetwood 5.7L MIL Lamp on VIN: 1G6DW52PXT
Hello, Thanks to all who replied. I took your advise and looked at what Could cause the code to set. I still could not find any problem. After some thought I replaced the pcm again, this time with a delco unit. My problem is solved. Thanks again for all of y... Trouble codes: P0441.
1993 Chevrolet C1500 Cheyenne 5.7L Radio VIN: 2GTEC19KX0
Hi IATN! Thanks to all who responded. Special thanks to Steve from NM and Dave from Delphi. I guess I couldn't see the forest for the trees. Alldata and Mitchell gave very limited info, but you guys came through. After doing ohm test [infinity]and voltage test...
1995 Chevrolet C3500 6.5L blown ecm fuse VIN: 1GBHK33F75
I found a wiring diagram, traced down from the ecm-b fuse and it pointed straight at the electric fuel pump. I replaced the fuel pump & the relay. The truck runs great now and the fuse is hanging strong.
1997 Chevrolet K1500 Cheyenne 5.7L power steering VIN: 2GCEK19R7V
The fix was to replace the rebuilt pumps with a new one from GM. Was told that it is currently discontinued, but dealer had one sent in from cyberspace somewhere. The new unit comes with a new EVO valve and therefore also replaces that. It works just as it sho...
1997 Chevrolet Monte Carlo LS 3.1L drivers window motor VIN: 2G1WW12M6V
Well it wasnt as easy as I thought. I even put in a 10 amp circuit breaker thinking that might fix it. I needed a new from the dealer window motor and they come with a new regulator. It seems as if the aftermarket window motor didnt have enough of a draw on it...
2000 Chevrolet Blazer LS 4.3L Cuts out VIN: 1GNDT13W2Y
Time to wipe the egg off my face. It always seems so obvious when you finally figure out what's wrong doesn't it. As I was explaining to the customer my suspicions about the MAF, I rested my hand on the air intake tube at the throttle body. As I did so , it fe...
2004 Chevrolet Silverado 1500 5.3L Stall VIN: 2GCEK19V52
well gents i am going to call this one a fix. thanks to all the ones who helped, every one was pointing at the wiring at the throtle body bulk head. i found that the green wire pulled lose with a tug. the trk has not returned and hopefully that it is fixed. th... Trouble codes: U0107.
1989 GMC V2500 Suburban Sierra Classic 5.7L Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GKGV26K0K
First of all I would like to thank everybody who responded to help us with this problem-- the original diagnois' of the computer being defective was correct. We received two new computers from the dealer and both of those made the vehicle run like it should, h... Trouble codes: 51 (check ecm prom and connections).
2001 Oldsmobile Intrigue GX 3.5L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3WH52H81
Sorry this has taken so long...It took about a week to get the customer back and I wanted to be sure it was fixed. I took most of your advice and replaced the MAF sensor with a new Delco. Almost instantly the fuel trims came up to normal. In fact they ended up... Trouble codes: P0172 (fuel trim rich).
1997 Pontiac Grand Am SE 3.1L valves
It ran away rinning like a Watch! I did have the hollow camshaft and I could see no damage to it. I crossed my fingers and it ran fine. One GM heavy line tech told me that the easy way to get the pushrods right is to look at the intake gasket. the long pushrod...
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