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Prev Professional Automotive Repair Technical Discussions for May 29, 2008
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Open Help Requests for GM
Help Request Answers
1994 Chevrolet S10 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Misfire VIN: 1GCCT14WXR
please help iatn, customer brought this vehicle in with misfires on cylinders 2,4, and 6; it idled very poorly and ran very rich. knowing that these are prone to leak we pulled upper plenum and found fuel pressure regulator leaking, but no leaks in lines. repl...
1996 Chevrolet S10 LS 4.3L Horn VIN: 1GCCT19X0T
The horn some times does not work. I would like to know where the ground is for the steering shaft. When going over a bump in the road it can make it work or not work. It seems like it is a ground on the steering shaft problem because when it was in previously...
2000 Chevrolet Blazer LS 4.3L Hesitation, Cuts out, Stall VIN: 1GNCT18W0Y
Hello there I have a problem child here. This blazer is cutting out and will stall under a light load while taking off. If you brake torque the vehicle it will easily build power to where the tires just barely spin(has low power), but if you put it into gear a...
2003 Chevrolet S10 4.3L ABS module VIN: 1GCCS19X43
Vehicle came in with ABS and brake warning lights blinking on and off. Checked codes and found a c0265 EBCM relay ckt. problem. Ran down diagnostic tree and determined that the EBCM needed to be replaced. Replaced EBCM and now there is no code c0265, however t...
2003 Chevrolet Silverado 3500 8.1L Starter relay VIN: 1GCJC33G63
This truck was towed in, customer said it died while driving, now it will not crank over. We checked it and found that everything powers up (instrument cluster and all accessories, radio etc.) with the key on. When you move the key to crank position, nothing d...
2004 Chevrolet Tahoe LS 5.3L MIL Lamp on VIN: 1GNEK13Z54
This vehicle came about a month ago with MIL on & wouldn't go over 15 mph. Found PCM was in "reduced power mode" & codes P0120, P0220, & P1516. Checked scan data, all looked good so we cleared codes & couldn't get them to come back. Truck came back in 3 days ... Trouble codes: P0120 (tps sensor 1 circuit), P0220 (tps sensor 2 circuit), P1516 (TAC module throttle actuator performance)
2004 Chevrolet Classic 2.2L Surge, Misfire, MIL Lamp on VIN: 1G1ND52F64
Have a Malibu here that has a rough Idle and misfire on all cylinders at Idle. Misfire will almost go away above 1500 rpm. Plugs are clean and dry. Injector flow test was from 52psi and droped to 40psi and all cylinders. Tested the MAP with a vacuum pump and l... Trouble codes: P0300 (Multiple cylinder misfire)
1997 Pontiac Grand Am SE 2.4L Cuts out, MIL Lamp on VIN: 1G2NE52T6V
This car starts fine but sets a code P0335 every time. I have replaced the crank and cam sensors, ignition module and PCM. Checked the wiring and terminals from the crank sensor to the ignition module,and from the ignition module to the PCM...all ok, no proble... Trouble codes: P0335 (Crank Shaft Position Sensor Circuit)
1998 Pontiac Grand Am SE 2.4L Stall VIN: 1G2NE12TXW
hey guys i have a 98 grand am that is driving me insane it will stall when the cooling fans come on just sitting idling if you idle it up it will just stumble a little or it will stall when driving and come to a stop. i replaced the cooling fan cause i thought...
1999 Pontiac Montana 3.4L sir
Greetings GM wizards. Sorry about the lack of VIN, I had the last 8 [[...]] but not the first 10. I'm stuck on this Montana that has a now-steady code B1042, for "LH side seat belt pretensioner circuit" I've followed the Mitchell Diagnostic tree but quite f...
2002 Pontiac Grand Am GT 3.4L all dash lights, i.e... abs, trac, cel VIN: 1G2NW12E72
this vehicle was brought into our shop with the customer complaining that all the dash "dummy" lights were on and would not go out. the car was driven by us for several days without being able to reprduce the problem. finally on the seventh drive the abs light...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Buick Century Custom 3.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1G4AH54N0L
No need to re-flash the ECM just move the prom over to new unit, so easy a caveman could do it….. A new ECM corrected the loss of data stream and also made the car run pretty good. However it still had a very mild miss. Ran as one expert said “like it was ner... Trouble codes: 88 (ECM Reset), 21 (TPS volt).
2000 Buick Park Avenue 3.8L LH tail and parking lamps stay on VIN: 1G4CW52K5Y
Thanks to all those that responded to my request for help. We verified all the wiring and bulbs were OK and decided to replace the flasher module. The key here was the cornering lights did NOT stay on when the left turn signal did remain on, so that allowed us...
1997 Cadillac DeVille 4.6L Misfire, MIL Lamp on VIN: 1G6KD54Y4V
Thanks so much for the replys. Alex, you hit it right on the head. My technician who stated he had checked all timing marks in reality had not actually checked chain from crankshaft to intermediate sprocket. After front cover removed found timing off between c... Trouble codes: P0340 (IC module cam reference CKT no frequency), P1571 (Traction Control system Pulse Width Modulated circuit no frequency.).
2003 Cadillac CTS 3.2L windows door locks and radio VIN: 1G6DM57NX3
Thank you so much for the help. I left the battery disconnected over night and problem has not returned in 2 weeks. Now the wipers coming on on there own was a result completely seperate involving just a bad wiper module.
1989 Chevrolet Corvette 5.7L No Start, Hard Start VIN: 1G1YY3189K
First off, "Thank You"! Gentlemen that took their precious time to help me fix my neighbors,"Baby".She just took it out for a test drive and came back with green backs in her hand,Smiling from ear to ear.David from Texas,and Ronald from California,Ding-Ding, y...
1993 Chevrolet G30 Hi-Cube 5.7L engine VIN: 1GBHP32KOR
For those who suggested that we re-torque the intake manifold, thank you. While the final results are not in yet, it appears that this may be the fix. The manifold bolts were extremely loose although they were torqued initially. We have since re-torqued them a...
1996 Chevrolet C1500 Cheyenne 5.0L Excessive Emissions, Hesitation VIN: 2GCEC19M7T
Customer took the truck and has not returned. have checked for powers and grounds and everything seems ok. leaning torward computer but customer hasn't returned. Trouble codes: P0122, P1122, P0172, P0175, P1406, P0748.
1999 Chevrolet Malibu 3.1L Cooling Systems VIN: 1G1ND52M6X
After reading all the replies. I have determined that this condition is normal for this vehicle. The fans are coming on at the right time. If your driving down the road, the gauge stays about the middle. Pressure test cooling system, system holding pressure an...
2002 Chevrolet Trailblazer LS 4.2L window switches VIN: 1GNDS13S92
Howdy again, I should have said that I took a rear window switch apart and found no logic in the switch, for there isnt, it does not have to be programmed. Only the front switches need programming and that being said I still find no logic in even that! Those e...
2003 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J93
Finally duplicated concern. only 9 volts at fuse block. replaced ign switch. car run good
2003 Chevrolet Malibu 3.1L noise VIN: 1G1ND52J03
received several great replies thank you everyone i did what the tsb said about the strut bearing plates but what i missed was the very top plate of the strut// it only is a round plate with a rubber sleeve in it// replace both sides and no more noise//...
1988 Oldsmobile Cutlass Ciera 2.8L over voltage code 51 VIN: 2G3AJ81W6J
Thanks for all the help on this olds. I fixed the problem by replacing the ecm with a reman. Started up with no codes and all perimeters where they should be. Customer had a little problem with the sudden demise of the oem part. Was fine after explaning there ... Trouble codes: 51 (High Voltage 19v).
2001 Oldsmobile Silhouette Premiere 3.4L Cuts out, Stall VIN: 1GHDX13E61
This one is solved but the finds are troubling. A known good 7x crank sensor cleared it up, but here's the trouble. I had already scoped the 7x signal and low ref several times before, even during the cut out event and the signal remained clean. So why did'nt ... Trouble codes: P1122, P1189, P1626.
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