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Prev Professional Automotive Repair Technical Discussions for August 29, 2007
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Open Help Requests for GM
Help Request Answers
1992 Buick LeSabre Limited 3.8L No Start VIN: 1G4HR53LXN
This vehicle was towed into our shop for a stopped running problem. The vehicle started immediately after dropped of and continued to run for hours. We retrieved a loss of crank code from memory, but found no current faults. We replaced the crank sensor for fe...
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1994 Buick LeSabre Custom 3.8L blower motor VIN: 1G4HP52L6R
i have a problem with an inoperarive blower motor. i have replaced the fan switch the relays and tested the fuses and for power at the switch the blower motor the resistor all of which have no power. has anyone run into a similar problem
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1997 Buick LeSabre Limited 3.8L vents VIN: 1G4HR52K9V
this car came with customer saying not cold enough air. first i turned on air and set control to med vent,it is computer control air with the pass control on the door, all it did was floor,and floor with windshield no middle vents and was cool not cold. gauges...
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1995 Cadillac DeVille 4.9L compressor
well the customer complains that the air condition stopped in the IPC memory i have code I039 and in the A012 now the compressor is not being turned on to work . I can bypass the compressor by jumping the relay the only problem is the dryer and lines freeze li...
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1991 Chevrolet Camaro RS 5.0L temp gauge VIN: 1GIFP23E9M
car came in for engine overheating and replace radiator, water pump, thermostat, flush cooling system, the radiator fan works, the fins in the condenser is in good shape no obstruction. check exhaust backpressure and resulted good. ignition timing is good. the...
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1993 Chevrolet K2500 Cheyenne 5.7L Mechanical VIN: 2GCGK29K8P
this truck came in with an idle surge and lack of power. (somtimes stalling) the iac always reads 0, which led me to beleive there was a vacuum leak and i found a small intake leak and repaired but still having the same symtoms. iac always reads 0 and fuel tri...
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1994 Chevrolet Caprice Classic 5.7L speedo VIN: 1G1BN52P8R
This car had the cluster replaced by the dealer about a month ago. It hads a digatal cluster and the speedo was not working in it and the odomerter was switching between 300000 and 700000. It came to us with the speedo not working in cluster. With the scan too...
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1994 Chevrolet K3500 Cheyenne 6.5L No Start, Stall VIN: 1GCHK39FXR
The truck shuts of like you turned the key of. sometimes will run for a half an hour or some times 30 seconds. the truck will start right back up sometimes. checked injector signal to pump witch drops out. Tried new pcm and had the same results. help
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1997 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCCS19X0V
customer just purchased this pick up and took in for state emission test.failed with multiple codes. first thing we found was a check engine light bulb that looked like a flash cube - replaced bulb cleared codes and test drove.after 2nd test drive we tripped a... Trouble codes: P0300 (multiple missfire)
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1998 Chevrolet C3500 Cheyenne 6.5L engine speed VIN: 1GBKC34F5W
Truck towed in to shop.New customer..turbo impeller missing,installed new turbo,engine revs up to limiter..and goes back down to 1100 rpm..and then back up.seems like an unmetered fuel problem,no codes ..coolant air intake sensors test ok.have never seen this ...
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2000 Chevrolet Silverado 2500 6.0L engine oil cooler hose VIN: 1GCGK29U8Y
trying to replace engine oil cooler hoses on this truck. Old hose assy came out OK but new hose assy is diffrent & I don't see how it is going to work. Dealer parts dept said there was a running change & this is the only hose they list- [...]. Checked NAPA ...
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2002 Chevrolet Monte Carlo SS 3.8L suspention VIN: 2G1WX15K12
Front end wobble. Mostly when turning right and under acceleration. It will also do it when accelerating and going over a bump, big enough for the suspention to move, kinda like a bounce. We have replaced the passander side axle with a rebuilt one from napa. W...
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1993 GMC K1500 Sierra 5.7L 1-2 shift VIN: 2GDEK19KXP
truck was brought to us with a 1-2 shift that will knock your teeth out every time it makes a 1-2 shift,trans is a 4l60e the epc solenoid and tps sensor had just been changed trying to correct this problem.all shift points and feel seem to be fine other than t...
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2000 GMC K2500 Sierra SL 5.7L door lock VIN: 1GTGK29U6X
Hi my problem is right front door will unlock with eather left or right door switch or the key fob but will not lock I have positive power to the acuator in lock or un lock but I loose the ground I put a jumper test lamp accross the conector and it lights in u...
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2002 GMC Envoy SLE 4.2L MIL Lamp on, Power Loss VIN: 1GKDT13S22
Vehicle came in with SES and Reduced Engine Power lights on. Scanned and found code P1221. Followed the GM flowchart and diagnosed bad throttle body. Replaced with new GM part. Initially, it seemed as if vehicle was fixed (lights stayed out and vehicle drove g... Trouble codes: P1221
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2004 GMC Yukon SLE 5.3L a/c VIN: 1GKEK13Z34
Hello fellow techs. I have an issue with a 2004 GMC Yukon. Truck came in with a problem affecting the a/c system. It seems that it would start blowing hot air through the front vents as though someone turned up the heat. The compressor never quits working and ...
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1992 Oldsmobile Cutlass Supreme S 3.4L Cuts out, Stall VIN: 1G3WH54X2N
This vehicle exhibits a stall condition that occurs whether driving or idling, open loop or closed loop. The only common denominator I've found is that as the coolant temp reaches 225 deg. and the radiator cooling fan is commanded ON, the engine stalls. It is ...
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1998 Oldsmobile Intrigue 3.8L ac controls VIN: 1G3WH52K9W
car came in with air running a few seconds then turning off. the light on panel goes out and comp. shuts off. push button and comp and light come on for several seconds ,then off again. anyone seen this before? thanks jay
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2000 Oldsmobile Alero GLS 3.4L insturment panel VIN: 1G3NF52E5Y
the instrument panel is not working. only the backlights and service engine soon light work. no gauges, tach, speedometer, etc. i tried a diffrent cluster and that didnt work either. thanks in advance.
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2001 Pontiac Montana 3.4L Poor Idle Quality VIN: 1GMD403E01
customer dropped off van , said that the throttle was sticking , after a lenghty road test the symptoms reoccurred , the engine would remain at 1500 some times 1200 rpm , scanner shows tps at 9 % and .57 volts so that should be okay mass air flow at 6 to 7 gra...
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Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Custom 3.8L starter
I received several fixes on this vehicle and all were pretty much right on the money. I had heard about this issue in the past but even after twenty years of wrenching, never ran into, till now. The resistor in the key mesured 1.136 k ohms. There is a ...
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2000 Buick LeSabre Limited 3.8L heated seat VIN: 1G4HR54KXY
THE THERMISTOR SECTION OF THE SEAT ELEMENT WAS OPEN CAUSING IT NOT TO FUNCTION. THANK YOU ALL FOR MAKING ME LOOK AT THE ELEMENT AGAIN
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2004 Cadillac Seville SLS 4.6L MIL Lamp on, extended crank VIN: 1G6KS54Y04
replacing the pcm corrected the problem. Both crank sensors now function and the vehicle runs in angle mode. I was able to do crank learn and no more codes. I delayed the post a few days because the NEW pcm programming failed on the first attempt and that had ... Trouble codes: P0335, P1372.
3
1986 Chevrolet Nova 1.6L Excessive Emissions VIN: 1Y1SK1949G
Classic. While scoping the oxygen sensor and watching the duty cycle of the EBCV I found that, more often than not, during the ASM test the PCM was ceasing to command the EBCV. Off idle, no load, however, it was consistantly operating. After decyphering the...
9
1993 Chevrolet S10 2.8L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCCS14R4P
Check and re-checked for vacuum leaks, nothing found. Removed egr valve, valve wasn't open, cleaned carbon around pintle. Check fuel pressure reg. fuel pressure held with return line pinched. Last resort went with a used pcm with prom, idle is now around 800 ... Trouble codes: 45 (o2 rich).
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1995 Chevrolet C1500 5.7L clutch
This one is finally fixed, thanks to all who replied. I tried changing the master cyl. one more time with one from a different supplier, because i noticed the clutch pedal was lower than the brake pedal when they were released. We found that the master cyl. pu...
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1996 Chevrolet C1500 5.7L starter VIN: 1GCEC14KOR
I appreciate all of the replies, they were very helpful. This was a new one for me. There is a ground for the pass side headlights right in front of the battery, the wires looked funny, so we started chasing that. The wires going to the horn in the center of t...
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1999 Chevrolet Blazer 4.3L mode switch VIN: 1GNDT13W5X
Thanks for all of the help. I would have liked to get my hands on this, but the other shop stuck with it and condemned the TCCM, like most of you said. They replaced it and she's back on the road. Thanks
13
2000 Chevrolet S10 4.3L ignition lock VIN: 1GCCS14W4Y
Thanks for the help. Two of the tumbler pins, the first one and the third, were "stuck" down as suggested by Dennis from FL. The vehicle owner had already soaked it down with WD 40, I used some more and with a seal pick reached inside the lock and flicked the ...
4
2000 Chevrolet Impala 3.8L No Start, Hesitation, Cuts out, Stall VIN: 2G1WF55K3Y
Thanks to all of you who emailed me with a possible solution. I replaced the crank sensor and that did the trick. Couldn't find anything 'wrong' with the sensor as I couldn't duplicate the customers concern, but after having the custoner drive the car for th...
5
2002 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEK13Z52
Thanks first off for all the helpful replies. Most people seemed to hit on the fuel pump, and this is what I think the problem is also. However, since I cannot abosultely confirm this being the problem, the customer understandably did not want to spend the $10...
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2003 Chevrolet Tahoe LT 5.3L No Start VIN: 1GNEK13Z23
I received a lot of good information and followed each lead but was unable to duplicate customer concern. After many miles of test driving and countless hours running outside the shop, The customer decided to take his chances. Its been a few weeks now and the ...
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2005 Chevrolet Impala LS 3.8L Cuts out, Stall VIN: 2G1WH52K85
I am sorry to say I let this one go. I had 4 replies telling me to check gounds, ignition switch, monitor crank & cam signals at icm while wiggling wires & tapping on computer. I have done all of these several times.I found out this was a used car they just pu... Trouble codes: P0350 (ignition coil control circut), P1350 (ignition bypass circut).
4
1995 GMC K1500 Sierra SL 5.7L stalling when warm VIN: 1GTEK14K9S
Alot of you guys gave me alot of good ideas to check. What I did was check the TB gasket which was partially sucked in, also checked the EGR valve which was leaking alittle, so I figured I had fixed the problem. Checked the distributor for worn bushings, and...
18
2002 Oldsmobile Alero GX 2.2L Mechanical VIN: 1G3NK52FX2
THIS ONES DONE, I THINK THE TENSIONER WAS THE MAIN PROBLEM IT MEASURED WAY SHORT 75MM AFTER REMOVAL AND MY CHAIN WAS SO LOOSE IT WAS SCARY. I INSTALLED THE CHAIN KIT #[...] AND WOULD RECCOMEND THAT ROUTE, THE LOWER FT COVER COMES OFF EASY AND THAT WAY YOU C...
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