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Prev Professional Automotive Repair Technical Discussions for February 5, 2013
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Help Request Answers
1995 Buick Riviera 3.8L eng temp gauge VIN: 1G4GD221XS
1995 Buick riviera came in with the temp gauge inop and prndl on dash stuck on drive. the prndl i thank is the position switch on the shifter but the temp gauge ican't fix. I have ohm both uart data wires from the pcm to the instr. cluster both were .3 to .4 o...
2008 Buick Lucerne CXL 3.8L No Start VIN: 1G4HD57298
Vehicle was towed in no start. Fuel pump not getting power from fuel pump relay. Coil side of relay has ground and power to the coil is being given when the ignition switch is turned as designed. What is happening is the 12 volt supply from the fuse drops to a... Trouble codes: P0230 (Fuel pump relay control circuit)
2003 Cadillac DeVille 4.6L starter VIN: 1G6KD54YX3
car came in intermitted no start no crank scan tool data shows crank request checked grounds at alternator bracket at trans and near battery swapped relays can jump relay and car starts and stalls have power at pin 6 yellow wire when key is in crank position c...
1996 Chevrolet K1500 Cheyenne 5.7L scan tool data VIN: 2GCEK19R3T
vehicle came in with burned transmission. customer bought it that way. we rebuilt the trans, installed transgo sk4l60 shift kit and a reman converter. drove great, no dtc's, good lock up, good trans fluid temp. fixed right? not this time. came back about 6 we...
2004 Chevrolet Express 2500 LS 6.0L No Start, Poor Idle Quality, Cuts out VIN: 1GCGG25U84
Have been working on this for a while now, trying to track stalling issue. Vehicle will not run unless holding accelerator. Cst had tune up done, changed mass airflow. It sounds like there is an intake leak, but cannot find one anywhere. Checked fuel pressure,...
2005 Chevrolet Silverado 1500 SS 6.0L Engine VIN: 2GCEC19N75
Hello everyone, I have a Silverado 1500 with a 6.0L engine that overheats in traffic. We have not duplicated the problem at the shop. Temperature regulates around [...]. The fans are cycling on and the radiator temperature up and down the tanks don't appe...
2010 GMC Sierra 1500 WT 4.3L drivetrain VIN: 1GTPKTEX6A
Good Day Fellow Wrench Turners This 2010 GMC has a strange problem which is intermittent. At times, mostly on light throttle or slight deceleration, there will be one or more random clunks generated in the drivetrain. There also seems to be a slight binding s...
1998 Oldsmobile 88 Royale 3.8L Intake Manifold VIN: 1G3HN52K5W
Water intrusion into intake manifold throught upper plenum at EGR port causing water to get into cylinders. Original manifold burned out the same way. Seems like EGR is opening too long causing a meltdown of manifold. We have no EGR codes

Fixes & Summaries for GM
Fix/Summary Answers
2007 Chevrolet Trailblazer LT 4.2L Instrument lamps VIN: 1GNDT13SX7
Turned out to be a connection. Not exactly sure which one. After pulling the rear fuse box and BCM everything started working again. Wish I could say exactly which connection but I am only sure it was in the rear fuse block area. Thanks for your help.
2005 GMC Canyon Z71 SL 2.8L Timing chain VIN: 1GTDT19865
Thank you for all of the prompt replies. Yes, the oil pan and the oil suction tube must be removed to get the timing cover off. There is a lot of labor involved in this job. My second question was: How do I know that the variable valve timing actuator is ...
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