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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for April 3, 2013
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Open Help Requests for GM
Help Request Answers
1996 Chevrolet Lumina 3.1L No Start, Poor Idle Quality, Surge, Stall, Misfire, MIL Lamp on VIN: 2G1WL52M0T
This car came in just over a week ago for a surge/misfire issue. Car ran ok so we went to the plugs. Original plugs so they were changed, test drove and all was good? Cuat. picked up car made a couple blocks and the surge/misfire was back and the SES light cam... Trouble codes: P0131 (low o2 activity), P0171 (lean bank 1), P0300 (multiple misfire)
2007 Chevrolet Silverado 2500 HD Classic LT 6.0L No Start VIN: 1GCHC24U17
this vehicle came in a tow truck,dye on the fly I have a code for no ignition one voltage, the scanner shows 0 voltage,but I have power to the ignition coils with the key on ignition relay has two battery voltages with the key on. fuel pump does not turn on,by... Trouble codes: P0556
2007 Chevrolet Impala LT 3.5L Misfire
Very slight miss on #4 . Changed plugs ,wires checked fuel pressure , vucum all very good . Mis does not start until engine runs for 30 to 40 seconds checked vacum leaks at manifold seems good cannot reach #4 injector with out disassembly of intake . We think ... Trouble codes: P0300
2008 Chevrolet Uplander LS 3.9L MIL Lamp on VIN: 1GNDV23W38
I have this uplander with a code po172 system rich. Fuel pressure ok looked at archieves found some with repairs,doing a fuel composition reset. My solus has a procedure to do the reset but when ido it it says time allowance exceeded and does not perform reset... Trouble codes: P0172
1999 GMC C1500 Suburban 5.7L Misfire VIN: 3GKEC16R1X
thanks in advance,, truck came to us after all the listed parts were replaced, fuel press, is in spec, short fuel trim is at 130 all the time at idle is this normal or high ,both banks, have checked for vac, leak dont find one, tried new air flow meter and map... Trouble codes: P0300
2004 GMC Yukon XL 1500 SLT 5.3L drivers seat heater VIN: 3GKEC16Z24
found this only occurs with door closed or latch rotated to locked position. suspect door latched signal to drivers door module somehow causing door module to turn seat heater on and off. seat heater switch signals go thru door module. this also occurs with se...
2002 Oldsmobile Silhouette Premiere 3.4L MIL Lamp on VIN: 1GHDX23E32
This is an odd one. GM appears to have a part manufacturing problem There appears to be a manufacturing issue with this new GM fill neck assmelby PN noted above This visit, customer came in with SES light on, and an evap trouble code We pursued the code, and f...
1994 Pontiac Bonneville SE 3.8L No Start VIN: 1G2HX52L8R
Hey guys, this thing came here from another shop that had replaced the ignition lock cylinder, Crank position sensor, and Ignition control module. The starter cranks good, The system has no spark or no injector pulse. It has a good camshaft sensor signal, 3x s...

Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick LeSabre Limited 3.8L fuse 29 undrseat fusebox VIN: 1G4HR54K15
Ok so 1st thing there was an aftermarket start under the dash (sorry forgot to post upfront) which leads me to the fix. When it was installed they ran the harness between the two metal braces under the steering column pinching them. We found a 1 - 2mm bare sp...
1989 Cadillac Eldorado 4.5L Excessive Emissions VIN: 1G6EL1156K
thanks for all the replies, but it was the AIR check valve going to the exuast manifold it was suck open and making it run lean. thanks for all the help Trouble codes: 46 (lean mixture).
1967 Chevrolet Bel Air 4.6L Mechanical
Wow ! thanks for all the responses. I got home an figured to adjust the cable alittle tighter. the lokar cable doesn't have a clicker like the stock. I adjusted it TIGHT @ wot. Now it runs and shifts perfectly. As far as lockup, the buddy who built it set it u...
1995 Chevrolet K1500 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on, possible misfire VIN: 2GCEK19K2S
Well I appreciate all the help from the very knowledgeable technicians on the network. I took the advice and rechecked fuel pressure when I retested it was only at 3 psi. I checked voltage at pump and found voltage of 8volts so repaired wire and re tested and ... Trouble codes: 33 (Map Sensor to High).
2003 Pontiac Vibe 1.8L C0210 Right rear speed sensor VIN: 5Y2SM62843
I pulled out the axle to see this tone ring with my own eyes and yes it had a crack. Changed the drive axle and it works like a charm. Thanks for all the help Eric
2008 Pontiac Grand Prix 3.8L Stall VIN: 2G2WP55218
After doing some research I was able to find a data pid chart that shows the crankshaft a and crankshaft b sensors should be equal to rpm. This is a direct contradiction to the beginning of the pinpoint test. I ended up selling my customer a crankshaft sensor(... Trouble codes: P0335.
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