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Prev Professional Automotive Repair Technical Discussions for June 24, 2010
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Open Help Requests for GM
Help Request Answers
1999 Buick LeSabre Custom 3.8L engine VIN: 1F4G58FFT6
First off gentlemen I don't have the car here so that is a incorrect VIN. Car makes a clicking/squeaking/rattling noise when accelerating while turning right or turning quick right when running down the road. The balancer had the usual 3.8 play in the rubber s...
1989 Cadillac DeVille 4.5L Hesitation, Cuts out, Misfire, Poor Fuel Economy VIN: 1G6CD515XK
Well i finally found a car thats killing me. This 89 sedan deville has been troubling me for a week and a half so far. It came in was a stumble under accel or pickup at cruise, first found no comm with ecm and tbi unit leaking fuel at regulator. Replaced ecm a... Trouble codes: 37 (mat circuit shorted), 40 (p/s switch circuit open)
1996 Cadillac DeVille Concours 4.6L high pressure VIN: 1G6KF5295T
...and end up with a good cooling but a high side that undoubtedly is too high and the programmer shuts off the compressor within a day. Pouring water on the condensor has little effect so I rule out air flow issues. Fans work seemingly well. Low side appears...
1997 Cadillac DeVille 4.6L Cam Timing VIN: 1G6KD54Y1V
Just installed new head gaskets & set cam timing with all pins at right angle to heads. Intermediate shaft & crank set pointing together. Engine binds when turning by hand. Ist there something i'm missing on the cam timing ? gotta get this car out of the shop....
1993 Chevrolet Corvette 5.7L Stall VIN: 1G1YY23P4P
we have a 93 corvette that came in with an intermitent stahling .after driving car for about 20 to 30 minutes the engine will shut off [even at freeway speeds] wait a few minutes and it will start back up and stay running .i found a bad sensor ground and repai...
1995 Chevrolet K1500 Silverado 6.5L Excessive Emissions, No Start, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2GCEK19SXS
my interest is knowing what fuel trims are based on. with no o2 or maf if you had this with - or + fuel trims where is the logic
2002 Chevrolet Silverado 1500 5.3L Transfer Case VIN: 1GCEK19T42
Vehicle came in with no 4 wheel drive and service 4x4 light flashing.The 4x4 switch on the dash will not light up in any mode.The only time it lights is when key is cycled to start and just for a split second.Checked for codes and no communication to 4x4.All o...
2002 Chevrolet Silverado 2500 HD 6.0L instrument cluster VIN: 1GCHK29U52
I have a instrument cluster with a PRINDEL that lights up intermittently only when the key is in ACC position. As soon as you start vehicle it blacks out. No speedometer, no PRINDLE, no tach, oil pressure, and no trans temp. Fuel Gauge and temp appear to be wo...
2003 Chevrolet Venture LS 3.4L Cuts out, Stall VIN: 1GNDX03E53
Came in earlier in the week with a complaint on stalling over bumps with trac off light on and misfire on restart . Checked out van and found loose connection at underhodd relay box and repaired it noe van has returned with same compalint . Sorry not much in... Trouble codes: C1276 (Delivered torque signal circuit), U1000 (Class 2 data link malfuntion), U1016 (Lost communication with ecm/pcn/vcm)
2004 Chevrolet Silverado 2500 HD 6.0L MIL Lamp on VIN: 1GCHK29U44
Truck has intermitant p1125 and reduced power. Customer replaced app sensor,wire harness between app sensor and tac module. After getting symptoms to appear scan data when acting up shows app sensor 1 0% app sensor 1 .67 volts app sensor 2 12% sensor 2 .57 vol... Trouble codes: P1125
2005 GMC Sierra 2500 HD 6.6L MIL Lamp on VIN: 1GTHK232X5
Hello techs, We had this truck come in with the "Check Engine Light" on two days ago. The code was P0101 MAF Sensor circuit. After some diagnosis the MAF and harness was changed. The CEL has not come back on, but this truck is pumping out the black smoke under... Trouble codes: P0101
1998 Pontiac Sunfire GT 2.4L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G2JD12T9W
Vehicle came in with a bad misfire, P0300,swapped out the complete coil housing (coil housing, coils and ECM)- used- no change. Realized #1 injector was firing slower than the others, and at that time seen on the genisys that "output driver 2 open" was showing... Trouble codes: P0300 (Random misfire)
2006 Pontiac Grand Prix 3.8L Radio And Info Center VIN: 2G2WP55286
Hello GM guys, I have a wierd one here and I suspect the problem is in the radio itself but see what you think. The complaint is that the radio's clock resets itself. We verified this - it does. First, we set the radio's clock to the proper time, and set the d...
2007 Pontiac Montana SV6 3.9L Rr Wss VIN: 1GMDU03187
hi guys, ivce got a 07 montana here, it was in an accident, body shop repaired the vehicle, when all was done the abs light was on for C0045 rr wheel speed sensor, the body shop changed the bearing with the sensor, they got it from the dealer. now the car will...
2002 Saturn L100 2.2L compressor VIN: 1G8JS54F02
Ive got this saturn that has had 2 compressors put on, when they were 1st installed the psi was 32 low side 150 high temp from vent is 48, after driving 20 miles it starts blowing warm and the pressure are 60 low side 200 high vent temp 76, accelerate low will...
2003 Saturn Vue 3.0L Surge VIN: 5GZCZ63B73
Customer brought vehicle in to our shop. Had several codes, listed above. We replaced a known bad ground going to the throttle body. Tested the tps sensors, at the pedal, tested good. Did continuity check between pcm and tps sensors, checks out ok. Checked the... Trouble codes: P2138, P0700, P0123, P1780, P1791, P0222

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick LeSabre Custom 3.8L centerline steering VIN: 1G4HP52K9V
Woops! We got a lot of usefull replies. The main problem was that the left lower control arm was bent. The fact that the aftermarket inner tie rod end we had installed on the right side had a LOT more threads on it the the original and the left side tie rod,...
1994 Chevrolet S10 Blazer 4.3L Poor Idle Quality, Hesitation, Surge VIN: 1GNDT13W6R
The PROM was from a astro van from a previous faulty repair. I was dead on with it being the PROM. Once installed truck ran great. Thank you for the one reply that gave me PROM info.
1995 Chevrolet K2500 Suburban 7.4L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Misfire VIN: 1GNGK26N9S
Thank's for all the replies, some of you hit it on the head. I unpluged the timing bypass and the datastream cleared up and truck ran fine. So I checked voltage on the tan with black stripe wire and found it was applying 5 volts on and off. The same as my data...
1998 Chevrolet Monte Carlo LS 3.1L Surge, Stall VIN: 2G1WX12K8W
Most people said to check the gas cap and the filler neck. Which I did end up running another smoke test, and pulling vacuum on the system to test the sensor, and came up empty handed.. The customer still insist, that on occassion she will start the vehicle, a... Trouble codes: P0442 (Evap system small leak detected).
2000 Chevrolet Silverado 2500 LS 6.0L Poor Idle Quality, Hesitation, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCFC29U8Y
found to have a plugged catalytic converter. had 8 psi of pressure when revving the engine. also replaced oxygen sensors on all four, before and after catalytic converter. Trouble codes: P0158 (p0300-), P0300 (p0405-), P0405 (Po171-), P0171.
2004 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality, Misfire VIN: 1GCHK29274
Sorry it took me so long to close, it was the wiring just at the break-out point in the harness above the injector. Have been unable to get time in the evening lately to get on here but thanks to those that responded and for the trial acess to the rest of the ... Trouble codes: P0203, P2149, P0742.
2005 Chevrolet Silverado 2500 HD 6.0L vent temp VIN: 1GCHK29U65
thanx to dan and everyone who replied, the customer brought truck back this morning and was blowing 45 F at idle and 38 F at 1500 rpms. everthing was done by spec on this job and i beleive next time one of these come in i'll remove all oil from the compressor ...
2006 Chevrolet Equinox LS 3.4L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on, Cooling fan inop VIN: 2CND123F86
Thanks for all the responses on this one. Rob was the first one to sugest the fix, which was our next step it was just getting the tech around to it. We pulled the connector to the pcm and found condensation and poor terminal connection, cleaned and reassembel... Trouble codes: P0030 (p0036-), P0036 (P0201-p0206-), P201P, P0230 (P0442-p0443-), P442P, P0449 (Several others).
2003 GMC Sierra 2500 6.0L Front Air Bag Sensor VIN: 1GTHK23UXF
This vehicle is fixed. I replaced the sensor after disconnecting both battery cables for 30 minutes. I used an OEM sensor. After new sensor was installed, light on dash went out. Thanks to all that replied.
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