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Prev Professional Automotive Repair Technical Discussions for December 11, 2006
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Open Help Requests for GM
Help Request Answers
1990 Cadillac Seville 4.5L Misfire VIN: 1G6KS5331L
car wsas in the shop and we first thought the camshaft was bad, pulled cover and rockers go up / down, replace plug and wire twice compression test was between 130-150, cap look and appear O.K. Thanks for any advice
1995 Cadillac Seville STS 4.6L Dash Displays VIN: 1G6KY5298S
A liitle help needed from the Cadillac Techs out there! This vehicle is experiencing battery run-down due to the Dash Instrument cluster not shutting down key-off. Specifically, the Fuel Computer, the DIC, and the HVAC Control head stay powered up, but not oth...
1997 Cadillac Seville SLS 4.6L Stall VIN: 1G6KS52Y4V
To all; thanks in advance, I have this caddy, my customer bought it used a couple of months ago. We dis a tune up, oil change etc.. whenhe bought it. recently he is complaining of an idle stall that seems to happen after it has benn raining, but I only saw it ... Trouble codes: P0300 (random misfire), P0138 (p0139-), P0139
2004 Cadillac CTS 3.6L abs, tcs VIN: 1G6DM57704
Hello everyone! Car came in with an intermittent ABS and TCS (Traction Control System) light on the dash and on the DIC (driver's info. console.) Road testing confirmed that, with the lights illuminated, both of these systems were indeed inop. When the car wa...
1997 Chevrolet Blazer 4.3L Poor Idle Quality, Misfire VIN: 1GNDT13W2V
i have a 97 s blazer that has miss fire on #4. fuel inj ballance test ok. spark ok. comp ok. any help??? thanks Trouble codes: P0300
1998 Chevrolet Cavalier LS 2.2L No Start VIN: 1G1JF5242W
this vehical has a starting problem when it is cold out in the morning after its been sitting all night.when you go to start it,it will start then shut right off then it may do it again or it may not start at all after about 15-20 tries you can get the vehical... Trouble codes: U1016
2001 Chevrolet Impala LS 3.8L Radio VIN: 2G1WH55K61
Radio powers up, no problem and when it works it sounds like a bad cell phone call(cutting in and out). Usally no sound at all. Recal radio w/tech 2, no affect. Radio transmits speaker info to amplifier(watched signal w/scope) but nothing is transmitted out of...
2001 Chevrolet Silverado 1500 4.8L steering wheel VIN: 2GCEC19V11
This customer came in the day after we replaced all his balljoints saying that there was a shake in the steering wheel that started around 70 km/h and got worse as speed increased. We started with balancing tires and rechecking front end. Tires balanced good a...
2001 Chevrolet Suburban 1500 5.3L abs pump VIN: 3GNEC16T71
ABS pump is constantly running even with key off. Diag. chart points to ebcm but this wasn't the chart specific for "pump staying on" symptom. It was for the code C0267 that I found. Has anybody seen this, before I spend $500 on a new module?
2001 Chevrolet Tahoe 5.3L Heater Performance VIN: 1GNEK13T91
This Tahoe is experiencing a lack of heater performance. Initially when vehicle came in found no matter how long the vehicle ran, the lower radiator hose (the thermostat outlet) stayed COLD at all times. At this point we put a water pump and thermostat into th...
2002 Chevrolet Trailblazer LS 4.2L compressor VIN: 1GNDT13S32
Vehicle came in with no R134A in the system. Another shop recomended to replace the compressor. I put in about 1.5 lbs of R134A and when the AC cluch kicks in, the engine rpm slows down and will stall. If i hold the rpm to 1500, when the AC clutch kicks in,...
2003 Chevrolet Silverado 2500 6.0L MIL Lamp on VIN: 1GCHC29U33
Hey guys have one for the GM techs. Vehicle came in with MIL on and a P0120. Vehicle would not go over 40 mph. This vehicle does not have a throttle cable. It is equipt with a "Throttle Control Actuator". Scanned vehicle and found TPS at 18% and 1.14 volts at ... Trouble codes: P0120 (Throttle Position Circuit)
1998 GMC C1500 Sierra SL 4.3L Cooling Systems VIN: 1GTEC14W6W
OK. This is a fun one. Pickup came in with the temp gauge not coming up. Coolants were mixed and formed a sludge. Pulled radiator and had it gone through, flushed coolant. Temp will still not go up. Replaced thermostat just in case, no change. The coolant is p...
2005 GMC Envoy XL SLE 4.2L No Start, Stall VIN: 1GKET16S55
I have an 06 Envoy that was struck by lightning. The PCM, BCM, Air bag module, and 4WD module have all been replaced. I have a theft control issue. The vehicle starts and dies. The BCM has learned the Passlock code. It is PassLock code 10. The Passlock sensor ... Trouble codes: P1630 (Theft deterrent learn mode active)
1999 Oldsmobile Alero GL 2.4L Poor Idle Quality, Stall, Misfire VIN: 1G3NL52T1X
Customer brought this vehicle in this morning compaining of a rough idle. pulled codes and found p0300. replaced plugs and boots. no change. had a known good coil/module assembly in house and installed it. no change. called customer to find out details of prob... Trouble codes: P0300
1997 Pontiac Bonneville SE 3.8L fuse grid keeping power VIN: 1G2HZ52K6V
Here is another fun one Techs. a/c head display power all the time with key out of ignition, (its suposed to be hot with key on) traced down to fuse A5 that powers fuse if I remove the fuse its shut off. Wiring diagram found all 4 fuses on that grid hot and th...
1995 Saturn SL2 1.9L Cylinder # 3 VIN: 1G8ZK5274S
Hellow I have a 1995 Saturn with the dual cam engine that came into my shop with no compression in cylinder #3. Upon teardown I found that the exhaust valves in cylinder #3 were burnt badly. I had the cylinder head rebuilt at a machine shop where it was surfac...
2002 Saturn L100 2.2L Misfire VIN: 1G8JS54F72
Happy holidays to all! I have a 2002 saturn L100 that skips number 4 cylinder when cold only. The skip is intermitant, is much more pronounced in gear at idle and deminishes as the coolant temp rises. It is very prevalent cold ( 200 misfires in aprox 1 minute... Trouble codes: P0304 (misfire 4 cyl.)

Fixes & Summaries for GM
Fix/Summary Answers
1995 Cadillac DeVille 4.6L MIL Lamp on VIN: 1DR235LGO9
thanks to all that replied, sorry it took so long my internet was down. i ran an idle re-learn and all is good now. thank you kevin [...] Trouble codes: 085 (isc fault).
1997 Chevrolet S10 LS 4.3L e.c.m VIN: 1GCCS19X7V
thank you all for the replies. We found the wires running close to the exhaust melted to the other wires and shorting to ground. We didn't see untill we removed the tape and plastic tube covering it the wires. also thie is the best web site and ones of my most...
1998 Chevrolet Tahoe 5.7L Poor Idle Quality VIN: 36NEK18R4W
Many Thanks for all the replies to my post. There were several different opinions including a leaking fuel pressure regulator and an update for the ECU software but the culprit was a leaking intake manifold gasket at #6 cylinder (lower half). Once the lower ma...
2001 Chevrolet S10 2.2L MIL Lamp on VIN: 1GCCS19541
I did find the sensor. It was on the frame behind the right front suspension. The diagnosis was a bad sensor. replaced the sensor took care of the problem. Trouble codes: P0178 (Fuel composition sensor circuit low), P0179.
2002 Chevrolet Impala LS 3.8L RF Wheel Speed Sensor VIN: 2G1WH55K72
Well, the vehicle has not yet returned for further diagnosis. Almost all the replies I received point to some sort of wiring problem, either at the connector or the sub-harness. When and if the vehicle does return, I will update the post as to what I find. Tha...
1997 GMC Yukon SL 5.7L Cuts out VIN: 1GKEK13ROV
well this one is fixed. it took alittle time to figure this one out and get the parts put in to confirm fix. it was the fuel pump. we covered everything and found nothing. so obviously we missed something right? started over and this time while watching fuel p...
1992 Pontiac Grand Prix GT 3.1L fuel gauge VIN: 1G2WP14T7N
Thanks for all the reply. I send the cluster out to my local GM dealer to have it rebuild, put it back and the low fuel light is not on all the time. The guages is now reading correct. Thanks again! You guys just added some information on my diagnostic tools.
1996 Pontiac Bonneville SE 3.8L Hesitation, Surge, Cuts out, MIL Lamp on VIN: 1G2HX52K2T
thanks for everyones help on this one. all the readings that i got from the snap on scanner was reading fine. just was not fast enough to pick up the glinches from the tps sensor. i replaced the tps sensor and the pigtail and the pigtail on the maf sensor. the... Trouble codes: P0102.
1999 Pontiac Sunfire SE 2.2L brake strut spring VIN: 1G2JB5245X
Thanks again for all the help/emails/phone calls. I ended up getting the springs from GM dealer (part # [...]) that cost $15.65/set. The first parts guy I talked to had priced the complete metal rod not the springs and once I told him I needed just the spri...
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