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Prev Professional Automotive Repair Technical Discussions for March 14, 2013
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Open Help Requests for GM
Help Request Answers
2001 Buick LeSabre Limited 3.8L Engine VIN: 1G4HR54K21
No codes. Sluggush pickup. Lugging. Vehicle came in with performance problems. All we had a chance to do was to check codes and run basic diag. Customer had to go to work. Checked with engine hot. Verified problem. Did not check fuel pressure. no time. All tes...
2001 Chevrolet Silverado 2500 HD 8.1L MIL Lamp on VIN: 1GCHK23G51
Greetings, Truck has symptom of hard starting and fault code for camshsft position sensor. Easy fix, right? Not so fast. This part GM p/n [...] is not available anywhere, no longer supplied by GM, checked every aftermarket and internet source and the part n... Trouble codes: P0342 (Camshaft sensor fault)
2004 Chevrolet Silverado 3500 6.6L cooling system VIN: 1GCJC33124
i have this duramax that is getting fuel into the coolant. i have removed the driverside valve cover thinking that this would be faulty injector cups like a ford might have, but after looking at the system i dont think thats possible. i dont work on many chevy...
2007 Chevrolet Avalanche LTZ 5.3L Misfire VIN: 3GNFK12347
This engine only misfires on #5 cylinder when the computer commands 4-cylinder operation mode. Once it trips the code P0305, it won't command 4-cylinder operation and doesn't miss again. Not sure if you can feel the misfire when it acts up because it runs roug... Trouble codes: P0300 (multiple cylinder misfire), P0305 (Cylinder 5 misfire), P0171 (lean bank 1), P0175 (rich bank 2)
2006 Hummer H3 3.5L Drivers Window VIN: 5GTDN13686
This vehicle came in to us with the problem being ABS Lt on,Trac Lt on,Ck Eng Lt on. Verified complaint. Brought into shop and hooked up to scan tool,No codes,except an evap leak small (P0442)Took for a test drive with scan tool,checking wheel speed..all good....

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Riviera 3.8L Poor Idle Quality, Cuts out, Stall, MIL Lamp on VIN: 1G4GD2218V
Thanks for everyone's help. I had someone in the vehicle monitor the signal on the scan tool data. At idle, everything was normal. When put in gear (R or D) the signal would drop out, then return. When it dropped out, a loud bearing noise can be heard insi... Trouble codes: P0102 (MAF Low frequency).
2004 Buick Rendezvous CX 3.4L Pw & Pl VIN: 3G5DA03EX4
Hello All... Sorry for the delayed update - hard to get more diagnostic time paid for by a used car dealer... I checked the entire rear dor - had continuity throughout -- and wires in the pillar were ok... Dan [...] hit the nail on the head... it was the wir...
1997 Chevrolet Tahoe LS 5.7L No Start, Stall VIN: 1GNEK13R4V
thank you all for the replies the vehicle has not been back yet this was a crazy one like i said before when it messed up it would only do it for a couple min not long enough to do testing and no rhyme or reason i drove this vehicle for 2 days with nothing the...
2004 Chevrolet Trailblazer LS 4.2L 4x4 VIN: 1GNDT13S84
i ended up trying a new switch on dash and it still acted up. luckily when it did act up i had scan tool hooked up and i could watch position switch signal at controller flickering all over the place. i replaced three wires from the shift motor to the controll...
2009 Chevrolet Cobalt LT 2.2L Reduced power/Limp M VIN: 1G1AT58H79
This one is a stumper... The car originally was acting up on slippery driving. I have driven the car every day since I have opened the help request and we have had several snowy days and it no longer acts up.. I gave it to the customer last Friday... Dont know... Trouble codes: P2135 (c0561-), C0561.
2007 GMC Yukon XL 1500 SLE 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GKFK16367
Thank-you all so very much for the information. I quoted the lifters and VLOM (as well as engine replacment). With all of your information we are pretty sure its the lifters and VLOM. The customer has decided to park it for a few months to round up the money ... Trouble codes: P0201 (Injector 1 control circuit), P0300 (Random misfire).
2006 Pontiac Grand Prix 3.8L inop when cold VIN: 2G2WP55206
Thanks for the replies on this one turns out the fix was to replace the battery and replace the starter relay. Found that if you tap the relay with the hood latch switch bypassed so the car thinks the hood is closed I could get it to startwith the remote clea...
2003 Saturn Ion-1 2.2L Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G8AG52F53
A big thanks to every one for the replies. What made this problem so difficult was that it was diff. electrical. It acted as though some one was under the hood while driving and disconnecting the ECM every time I stepped on the gas. From 0 to 30 every thing is... Trouble codes: 1599 (all codes show up).
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