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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 9, 2014
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Open Help Requests for GM
Help Request Answers
1985 Cadillac Eldorado 4.1L Surge VIN: 1G6EL5783F
Car starts great cold, runs to full operating temp then starts to surge in park or drive. Checked for orn cam, fluctuating vacuum, leaking egr, leaking evap solenoid. No codes. The base tps was checked with isc unplugged and is at .46 when the isc is plugged i...
2001 Cadillac DeVille DTS 4.6L No Start, No PCM Communication VIN: 1G6KF57981
I am working on this vehicle for a friend of mine who is struggling financially. I am an Auto AC Technician but decided to take on this job for him. Anyways, The vehicle will not start. Load tested battery, Failed. Replaced battery with new one that meets vehi...
1999 Chevrolet Express 3500 6.5L Stall VIN: 1GCHG39F0X
customer brought van in complaining of stall on deceleration asked us to change fuel filter. Now the van cranks and runs for about 3 min sometimes less. Is it possible the injection driver has failed again this quickly. I am not a diesel mechanic by any means ...
2004 Chevrolet Suburban 1500 LS 5.3L Low Power VIN: 3GNFK16Z24
This one is though. Very low power when accelerating. Has low exhaust pressure and low engine vacuum 14in at idle even lower at cruse. Calculated engine torque is 4% at idle. It is not exhaust. I have removed and still same thing. No codes. Fuel pressure good....
2007 Chevrolet Impala SS 5.3L No Start, Cuts out VIN: 2G1WD58C47
customer brought the car on tow truck, car was not starting and ECM IGN 10 Amp fuse was blown replace the fuse car fire right back up. Check All the wiring everything seems good. Gave the car back to customer and after 2 days same fuse blow again . Cannot dupl...
2008 Chevrolet Uplander LS 3.9L Cooling System VIN: 1GNDV23W68
customer comes for an heating problem. No heat at idle, but heating properly when rising rpm. But on the road, temperature stays good in the cluster. was missing little of coolant. Topped up, but surprise, air always comes on quickly. Boom! I badly burned my a...
2008 Chevrolet Express 3500 4.8L Day time running lights and Brake warning light VIN: 1GBHG31C18
This vehicle has had a dead battery a couple of timed during the summer. We would go out and replace the battery with a good recharged battery. Test the charging system and run a computer scan, everything check ok. The last time I was there to replace the batt...
2011 Chevrolet Express 3500 6.0L Not sure VIN: 1GB3G2BG4B
I was thinking I have a bad compressor assy this is where it gets weird here if I disconnect the alt field wire my noise stops rear a/c compressor works great and is quiet the alt viberates badly when loaded with the rear a/c system on has anyone seam any prob...
2004 Oldsmobile Bravada 4.2L MIL Lamp on VIN: 1GHDT13S24
OK here we go, thank you all for your valuable time.. We replaced this 4.2l that had a rod knock with a jaspers unit, after test drive P0016. the tech replaced the phaser sol thinking it may have had shavings in it. no change.. When I try and run a manual test... Trouble codes: P0016 (Cam crank correlation)

Fixes & Summaries for GM
Fix/Summary Answers
1995 Cadillac Eldorado 4.6L Poor Idle Quality, Misfire VIN: 1G6EL12Y4S
first off Thanks to Hal, the relearn of the idle was a big help once i fixed problem. finally pinned this one to P.C.M. scoped E.S.T. wire from pcm and once idle would start to surge lost squarewave out of pcm to ignition module. Replaced pcm then [...] aft... Trouble codes: P0023.
2003 Cadillac CTS 3.2L calipers VIN: 1G6DM57N83
As most suggested, the fix for this vehicle was 4 new calipers. Brakes were all original on this car with 115k on it. Little old lady that only drives to church and the grocery. Compressing the pistons back to original positions pushed corroded areas over t...
2011 Chevrolet Express 3500 6.0L A/C Comp VIN: 1GB3G2BG4B
heres what I learned if I disconnect the field from the alt my compressor is quiet and rear a/c blows cold but plugged in the alt viberates has high idle I just don't know what to think anymore it only had 145 amp alt on it has anyone seam these cutaway buses ...
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