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Prev Professional Automotive Repair Technical Discussions for November 24, 2014
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Open Help Requests for GM
Help Request Answers
2003 Buick LeSabre Limited 3.8L Lock up VIN: 1G4HR54K63
Had posted this before , however I could not up date. Vibration in 3rd and 4th at 1000-1500 rpm. As some suggested we commanded lock up off and vibration went away. Torque converter? TCC solenoid? Pressure solenoid? Transmission was rebuilt 19K ago
2006 Chevrolet Equinox LT 3.4L Coolant VIN: 2CNDL73F36
This car was bought at an auction by our car lot. The heater core was leaking so we replaced it. Everything went fine. Bled cooling system and test drove. Plenty of heat. Didnt over heat any. They put it on the lot and sell it a month later. Customer makes it ...
2008 Chevrolet Avalanche LS 5.3L misfire VIN: 3GNFK123X8
misfire in #7 but cel only shows a p0300
2004 GMC Envoy SLE 4.2L Poor Idle Quality, MIL Lamp on VIN: 1GKDT13S14
This is a weird one here, almost makes me think I'm overlooking something really simple. This Envoy came in the other day with a "reduced power" and check engine light on. The customer said he came out of work and it was running really bad. I scanned the PCM a... Trouble codes: P1680 (TCC PWM solenoid circuit), P2176 (TAC system idle not learned), P0740 (TCC circuit open), P0753 (1-2 shift solenoid), P0785 (Shift timing solenoid 3-2 shift), P1682 (Ignition switch circuit)
1991 Oldsmobile 98 Regency Elite 3.8L Battery Draw VIN: 1G3CW53L2M
Hi: This car as towed to me. After charging battery - runs but idles a little rough. Dash lights are on all the time killing battery. Also has codes 31, park/neutral sw problem, and 41, cam sensor circuit. We installed a new cam sensor because it was cheap but...
1993 Oldsmobile Cutlass Ciera SL 3.3L Stall VIN: 1G3AM53N5P
Older, well kept Olds. Customer dropped off with complaint of intermittent stalling, always while slowing to a stop. Brought vehicle in for preliminary scan and found codes listed. Gathered ECT, TPS, and Battery Voltage PIDs and set to graph. Started vehicle i... Trouble codes: 15 (Coolant sensor), 16 (High Battery Voltage), 21 (TPS Circuit), 43 (EST Malfunction)

Fixes & Summaries for GM
Fix/Summary Answers
2003 Buick LeSabre Limited 3.8L Unknown VIN: 1G4HR54K63
Thanks to all that replied. We did not fix this yet, however we isolated the issue to the transmission. With lock up commanded off the shudder is gone.
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