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Prev Professional Automotive Repair Technical Discussions for November 30, 2007
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Open Help Requests for GM
Help Request Answers
1990 Buick Reatta 3.8L serial data line VIN: 1G4EC13C3L
all the data line circuits check out ok installed new bcm, ecm, eccp, ipc, derm, hvac programmer. instrument panel indicates 00 error and climate control has 3 dashes car runs fine and everything but the cruise control works and high beams and fog lights st...
1990 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions VIN: 1GCDC14K2L
Hello all, I've hit a wall. This is what I've got, hold the throttle at 2000rpm, o2 volts go to .030 sometimes less. Scan data shows integrator at 128, block learn at 117, coolant temp 185f, CLOSED LOOP operation, 1.5ms injector pulse width (checked with lab s...
1994 Chevrolet Beretta Z26 3.1L Cuts out, Stall VIN: 1G1LW15M7R
This car will start fine every time, fuel pressure is 30lb to start off with. It does not matter if the vacuum line to the regulator is unplugged or not, and there is no fuel in the vacuum line like there would be from a leaky regulator. It will run for a few ...
1996 Chevrolet Lumina 3.1L Sarter, and charging system VIN: 2G1WL52M35
hi all, thanks in advance for your help on this one. i generally do very good with just about any electrical problem, but this one's got me stumped.(and i fear it's going to be something incredibly stupid i should've seen) about three weeks ago, i replaced the...
2002 Chevrolet Impala 3.4L no low beams VIN: E029169502
thanks for your help in advance car came in no low beam headlights highs work great. got a dighram of the system and ck the headlight switch relays and the dimmer switch they seem to be working, the lights got constance power they work by getting the supplied ...
2003 Chevrolet Impala LS 3.8L Hesitation, lack of power VIN: 2G1WH52K13
Hello everyone, Thanks now for the advice. I am the third tech to attemp repair on this vehicle and am stumped. Vehicle came in with a P0401 code and a lack of power. They replaced to EGR valve which cleared the code. When running at light throttle vehicle run... Trouble codes: P0401 (egr), P0300 (random miss)
2003 Chevrolet Tahoe LT 5.3L No Start, VIN: 1GNEK13Z13
truck was towed in for nostart. found no codes. truck only cranks for 5 sec. and then stops cranking. if you back off switch engine will crank again but only for 5 sec. checked and found no problems with vtd system. checked some other things and found 12v ref ...
2004 Chevrolet Tahoe LS 5.3L rear heater VIN: 1GNEK13ZX4
Thank you in advance. We have a 2004 Tahoe that the rear heater temperature control is inoperative. We scanned it for DTC - no codes. Voltage cycles between 2.5v and 5.0v at terminal 6 on air temperature actuator. You can feel the motor try to move. Remove act...
1994 GMC Sonoma SL 2.2L rough idle VIN: 1GTCS1447R
this vehicle belongs to a regular customer, and has been relatively trouble free. however, the heater core spring a leak and the customer continued to drive the truck until it overheated and blew the head gasket. even with a blown headgasket the truck still ra...
1995 GMC C2500 Sierra SL 6.5L Cuts out, MIL Lamp on VIN: 2GTFC29S8S
engine will cut off after about 5 to 10 minutes of running. will restart most times. injector driver module was replaced about 1 month ago, problems went away during that time. now is acting up again. cleared trouble codes, code 36 comes back as soon as truck ... Trouble codes: 33 (egr pressure or baro sensor circuit high), 35 (injector pulse width too short), 36 (injector pulse width too long), 44 (egr pulse width modulation error), 57 (5 volt reference short), 62 (turbo boost sensor circuit low 78 wastegate circuit fault)
2004 GMC Envoy XUV SLE 5.3L rear gate glass VIN: 1GKES12P54
the problem is the rear gate glass will not roll up when the switch is depressed when the window switch is depressed the message center reads (wiper obstruction). when the wiper switch is activated the message center reads (glass down).i have removed the door ...
2004 Oldsmobile Bravada 4.2L lack of acc light VIN: 1GHDT13S04
OK i have an intermittant here that is driving us nuts. This bravada came to us a few months back with a rat attack under the hood first off we found some turn signal wiring chewed up and fixed that. Weeks later the vehicle came back with a lack of power light... Trouble codes: P2138 (1-2 corolation)
1996 Pontiac Grand Am SE 3.1L security VIN: 1G2NE52M7T
just bought car it has been a flood rebuild started fine when first got then start then die security light flashes
1996 Pontiac Grand Am SE 2.4L Poor Idle Quality, Misfire VIN: 1G2NE12T6T
thanks for your time guys. car came in missing very bad. checked codes (no light) p0300 misfire.checked mis data all 4 cyl 0's (my scanner always shows ign misses sofar) check engine data lt fuel trim avg -100%,lt ft -11.7, short ft 0% st ft avr -100%, spark a... Trouble codes: P0300 (misfire)

Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac DeVille 4.6L No Start, MIL Lamp on, VIN: 1G6KD54Y1X
Sorry abourt the delay, I've been on vacation. The responses I received were very helpful in giving the customer an estimate. He (used car dealer) didn't want spend that much (I considered it the least expensive fix of all possibilities). Nonethe less the car ... Trouble codes: P1605 (loss of HVAC serial data), P1610 (loss of PZM/BCM serial data), P0603 (PCM KAM error/reset), P0758 (2-3 sh sol B cir fault), P1602 (loss ABS serial data or KS mod), P1610 (loss of PZM/BCM serial data).
2000 Cadillac Catera 3.0L Alternator VIN: W06VR54R6Y
replace alternator again and the problem was gone , thanks to all for all the help scott
2007 Cadillac DTS 4.6L Charging VIN: 1GEEH96Y47
Thanks to everyone for their ideas on this Caddy. The only thing I could find was a small inductive sensor around the negative battery cable under the rear seat that was unplugged. After plugging it in and checking everything again I let this Caddy go and so f...
1991 Chevrolet R3500 Cheyenne 7.4L left front wheel VIN: 1CRLF47R4L
Well, I tried it all, the calipers had the same size pistons, i tried new pads, I tried swapping pads too. The suspension is solid. I even pulled the hard line to check it and it was clear. The only component left was the proportioning valve, and this ite...
1996 Chevrolet S10 2.2L No power VIN: 1GCCS1443T
Sorry I did not fix this but they decided to take the truck.Its not worth fixing.I almost sure the chain/tensioner is out. Trouble codes: P0342.
1997 Chevrolet K1500 5.7L transmission? VIN: 1GCEK19R5U
Sorry for late post, just now got info on fix. Customer had trans replaced, and problem is gone. They installed a used unit, so we will never know what in the trans did it.
1999 Chevrolet Cavalier 2.2L Hesitation, Surge, MIL Lamp on VIN: 3G1JC5244X
Well I'll never let this happen again, it appears someone (multiple drivers/fleet vehicle), decided to fill the tank up with alcohol (E85), took a sample in a jar and added water, the water floated on top, drained the tank and filled with gas, fuel trim went b... Trouble codes: P0171.
2003 Chevrolet Malibu 3.1L harsh upshift VIN: 1G1ND52J43
Well the quick summary is that the tranny has been sent out to be rebuilt. I had placed a call in to identifix, and learned that on 98 and later GM, if the shift times are over 0.7 seconds that indicates a internal problem with that gear. I believe that piec...
2003 Chevrolet Silverado 3500 6.6L front end VIN: 1GCJK33113
Thanks for all the replies. The customer returned with the truck and we removed the front drive shaft with no change in the shudder. I raised the rear of the truck and let it idle in gear the rear of the transfer case was moving back and left and right. I lube...
2003 Pontiac Grand Am GT 3.4L all dash waring lights VIN: 1G2NW12E93
First off Thank you all for sugestions and help. What I fund was that it had bad ground to the alt. (entire engine) Several times I did voltage drop test on the power and grounds and every time i got 0.04 at most with key on engine off wipers,radio, heater b...
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