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Prev Professional Automotive Repair Technical Discussions for February 13, 2009
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Open Help Requests for GM
Help Request Answers
1995 Buick Riviera 3.8L Poor Idle Quality VIN: 1G4GD22K65
Customer brought in pieces of his intake plenum, he said it was running rough, then back fired and blew the plenum up. I know about the problems with these but never heard of one blowing up. I replaced plenum car runs great, no codes, please any ideas on how t...
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2005 Buick Terraza CXL 3.5L battery VIN: 5GADX33L65
hello all tech, this van been jumped twice in two mos.we replaced the battery 2mos ago.yesterday they had to jumped it again..the owner mention that when he change the radio station to this one particular preset station he hear a noise.so i tried switching sta...
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2001 Cadillac DeVille 4.6L traction control light ,turnsignal VIN: 1G6KD54Y4U
I have this pos deville in here. When the turn signal is applied, the traction control light comes on, every time. Has code P2195 in ABS module. I performed the TSB regarding cleaning the grounds at left rear light ,under seat, and under hood.I ohmed the CHMSL...
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1990 Chevrolet K1500 Cheyenne 4.3L MIL Lamp on VIN: 1GCDK14ZXL
this vehicle came in with a code 32 egr system, we checked the vacuum system and found that the air diverter valve won't hold vacuum (it shares manifold vacuum with the egr solenoid)so we replaced it with a used valve (new part $350) even after the valve was r... Trouble codes: 32 (egr system)
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1991 Chevrolet C3500 Cheyenne 7.4L Surge VIN: 2GCHC39N9M
I have this truck that has a surge at a steady 45mph and will disapear about 50mph then @ 70,72,73 mph it comes back no codes the grounds are good. the surge feels like the overdrive going in and out but when you push the button to disingage the over drive no ...
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1996 Chevrolet C2500 7.4L vibration VIN: 1GCGC29J2T
Hello to all,, I dont see many 2x2 trucks here and I'm fairly good at virbration diag. this truck has a slight virbration at 38 to 48 mph. you can feel it both in the steering wheel and body of the truck. Cust just purchased truck no history beyond me. He thou...
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1996 Chevrolet S10 LS 4.3L timing chain VIN: 1GCCS14X9T
Customer initially complained of lack of power, I drove it and it felt fine. One month later there was noticable ticking coming from the timing cover and cranking during start up was certainly more labored than before and there was a noticalbe lack of power. W...
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1999 Chevrolet Monte Carlo LS 3.1L abs function VIN: 2G1WW12M1X
hello everyone. I have this 99 monte. The customer came in with abs light on. found the motor pack unit relay sticking inside showing low voltage. replaced the whole unit assembly (used). all was well customer took veh. two weaks later customer calls and says ...
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1999 Chevrolet Malibu LS 3.1L bcm VIN: 1G1NE52M4X
Have a draw when car sits overnight. Unhook BCM and draw goes away, traced down wires on BCM and can not find short. PLEASE HELP!!!
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2000 Chevrolet Tahoe 5.7L engine
i recently purchased a tahoe with a blown motor i swapped it with another 5.7 chevy same year 96. after starting i noticed a vibration its not a bad vibration but you can feel it in the truck at an idle more annoying than anything. my question is the motor i t...
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2003 Chevrolet Impala 3.4L cyl head VIN: 2G1WF52E33
GM techs: cylinder #5 rocker arm bolt pulled out of the head, threads stayed on the bolt, nearly 100K miles on the engine. Same thing occurred on cylinder #3 60K miles ago. Dealer performed first repair under warranty. I am going to be replacing the head. What...
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2005 Chevrolet Trailblazer EXT LS 4.2L MIL Lamp on VIN: 1GNDS13S35
Thanks again ahead of time for your help.I have had this same vehicle here before and again I need help,but this time I need some imformation.This vehicle has has several issues with the guages and I already had the instrument cluster replaced and was waiting ...
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2004 GMC C7500 Topkick C7C042 8.1L tachometer VIN: 1GDL7C1E84
Very simply; If I connect my Snap-On Solas Pro scanner, I have a good rpm signal, however the tach on the dash panel does not work. I cannot find a wiring diagram for this vehicle. I am tempted to change the instrument cluster but it's over $300.00. Can somebo...
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2000 Pontiac Sunfire SE 2.2L Stall VIN: 1G2B1246Y7
I have never seen this car before today. She says it stops running, just like turning off the key. Checked for vaccuum leaks, trouble codes, electrical system, everything appears normal. She says it starts good, runs good, except sometimes when she pushes the ...
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2004 Pontiac Montana 3.4L heater core VIN: 1GMDX03E64
Hi thanks for the help. This van has been to 2 differnent shops with the same problem. The customer states not heating well and poor air flow. The van in the shop will have 120 reg temp @ idle 140 to 150 @ 2500 to 3000 rpm. I did not see any change with the am...
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2004 Saturn Ion-2 2.2L power steering VIN: 1G8AJ52F74
Customer came in with power steering inop. Appears as though they jumped started it wrong and blew steering fuse. Replaced fuse, now steering works intermittently. Seems to reset after key off and re-start. Fuse no longer blows. Cannot scan for codes because m...
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Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick LeSabre Limited 3.8L oil presure VIN: 1G4HR52K3V
THANKS GUYS.. I DROPPED THE PAN SCREEN WASNT THAT BAD.LITTLE MORE FEELING AROUND AND FOUND BEARINGS ARE BAD AND WHO ELSE KNOWS WHAT. CUSTAMER DOES NOT WANT TO REPAIR CAR SO I OWN IT NOW.IVE DONE A FAIR AMOUNT OF THESE 3.8 LITTER MOTORS AND HAVE NEVER SEEN THIS...
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1999 Buick Park Avenue 3.8L Misfire VIN: 1G4CW52K5X
Thanks to all, it ended up that the cage was damaged and the crankshaft positioning sensor couldn't pickup a single on 1&4. It ended up that the previous mechanic tried to get the crank sensor off without taking the balancer off. Thanks again for all the help. Trouble codes: P0300.
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2001 Buick LeSabre Custom 3.8L Extended Crank VIN: 1G4HP54K02
Thanks to all that responded, after going back and re-checking all inputs, powers, grounds, resistance, connections i replaced the ECM and that took care of the problem. After talking with a GM engineer, come to find out that these newer ECM's aren't as reliab...
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2001 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y31
Hey guys, I found the rubber boot that connects the TBI to the intake manifold to be dry rotted and not sealing right causing a leak. I found the little plug on the end of the intake manifold by the power steering pump to have a tiny pin hole in it. Fix was to... Trouble codes: P0101, P0420.
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2001 Checker MONTE CARLO 3.4L blower motor risisstor VIN: 2G1WW1ZE71
WELL I REPLACED THE BLOWER RISISTOR ASY AND BLOWER MOTOR. AFTER TALKING TO THE CUSTOMER MORE I FOUND OUT THAT THEY HAVE BEEN HEARING THE FAN SLOW DOWN AND THEN PICK UP SPEED WITH OUT MOVING THE FAN SPEED SLECTOR SWITCH. THEY DID ALSO TELL ME THAT ABOUT A MON...
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1997 Chevrolet C3500 5.7L Mechanical VIN: 1GDJC34R2V
Thank you for all the replies.Jamie [...] hit the nail on the head.I replaced the flexplate, I couldn't see anything wrong with it, but installed a new one anyway,made 50 miles, and it didn,t leak a drop.It must have been flexing. This one was a headache for ...
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1997 Chevrolet Blazer 4.3L Unknown VIN: 1GNDT13WKV
Well folks, thank you for your info, almost everbody suggested wheel speed sensors. First I cleaned the sensors and the toothy rings.They were very dirty. Grease, dirt and metal debris were present.This cleaning did nothing to improve the problem. I rechecked ...
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1999 Chevrolet Cavalier 2.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 3G1JC5248X
this vehicle has a secondary pcm for the alternative fuel system. found that the map sensor was not reading the same as the barro at koeo. the map sensor sends a signal to both pcms. pulled the pcm for the alternative fuel and found that some of the connectors...
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2001 Chevrolet Silverado 2500 HD 6.6L cooling system VIN: 1GCHK23151
well kevin from pennsylvania hit it on the head he even had pictures of what to look for and thomas with the same fix so thanks to all and especally to kevin and thomas. well here goes last friday night i pressurized the cooling system up and it sat overnig...
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2001 Chevrolet Tahoe 5.3L speedometer VIN: 1GNEC13T81
Everyone thanks for the help found the problem behind radio, had radio wired to vss wire.Thanks for all the replys
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2005 Chevrolet Silverado 1500 4.8L 2nd gear VIN: 1GCEC19V55
Well, the shop owner talked the cust into buying a SRTA. Once the old trans was out, I took the 2-4 servo cover off and didn't find any problems with scoring, damaged seal rings, apply pin, etc. I did smell a strong burnt friction odor coming from the servo / ...
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1994 GMC Jimmy SLE 4.3L 2-3 shift VIN: 1GKDT13W0R
the customer gave me the truck for the labor i have in it i am going to rebuild the transmission. the 3-4 clutch is smoked thanks to every one that helped
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1999 GMC 6500 7.4L No Start VIN: 1GDJ6H1D0X
After labscoping the crankshaft sensor and seeing it drop out after 2 seconds we new that we had a issue with the crankshaft sensor signal. We had already replaced the crankshaft sensor and the wiring all checked good so the chart for p0336 led us to excessive... Trouble codes: P0336 (Crankshaft Position Sensor performance).
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2003 GMC Yukon Denali 6.0L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GKEK63UX3
It was the intake manifold gaskets, (right between pistons 4 and 6). After performing a smoke check it was obvious that was where the problem existed. Thanks for all the replies and help. You guys are awesome. Craig Trouble codes: P0101, P0171, P0174.
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2006 GMC Envoy SLE 4.2L Spark plugs VIN: 534811GKDT
Thanks very much for your advise on changing plugs on the 4.2.Not being that familiar with this engine I didn't want to get myself in trouble like has happened on some of the Ford engines(plugs breaking off etc.).Just standard precausions for aluminum heads.TI...
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1999 Oldsmobile Bravada 4.3L No Start VIN: 1GHDT13W9X
Thanks for all the replies .I ended up replacing the 6 month old cap and rotor there must have been a defect in the cap. Stung by the new /bad part syndrome.The coil always had good spark but the spark at the plugs where good some of the time.Again thanks for ...
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2000 Pontiac Sunfire GT 2.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3G2JD12T3Y
Thanks for the suggestions of lean at idle and inj balance test. I did another injector flush and that took care of the idle misfire. The cat was only a few months old - it temp tested fine and at idle was working ok - under load it could not keep up and thus ... Trouble codes: P0420, P0300.
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