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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for May 17, 2012
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Open Help Requests for GM
Help Request Answers
1991 Cadillac Eldorado 4.9L MIL Lamp on VIN: 1G6EL13B6M
This car came in with a very high idle and set two codes, codes 55 and code 52. Went through dio test found broken ground wire at the starter. Repaired broken wire and replaced the pcm. Replaced the throttle position sensor. Set the throttle position sensor at... Trouble codes: 55 (throttle position sensior misadjusted), 52 (memory reset long term)
1994 Chevrolet Corvette 5.7L Poor Braking VIN: 1G1YY32P7R
This Corvette has a poor braking problem at speeds above 40 mph. If you stop slowly it is fine until you try a panic stop. The pedal goes down about half way then stops, hard as a rock and the car will not lock up the brakes even with the abs disabled. The tem...
1996 Chevrolet Cavalier 2.2L cam and crank sensor VIN: 1G1JC5245T
Just replaced head gasket car started came to temp and died. car has inermitently started several times since. when no start condition exists, there is no spark no injector pulse. 12v voltage to cam and crank sensor changes from 9 to 12 volts. but car doesn't ...
1996 Chevrolet Impala SS 5.7L MIL Lamp on VIN: 1G1BL52P5T
Hi fellow iatn members, thank you in advance for your time and help,I'm working on a 1996 impala ss, 350, with an optispak ignition system. customer came with a cutting off at highway speed, 60-65 mph.we checked for codes, found dtc po372, ignition high resolu... Trouble codes: P0372, P0336
2000 Chevrolet Impala 3.8L no start VIN: 2G1WF55K5Y
Lock cylinder was worn out. Took key and lock cylinder to GM and he just keyed me up a new lock cylinder with the new passlock sensor. Installed the new lock cylinder and turned the key and it started right up. Car sat a couple days until the time came for o...
2000 Chevrolet Impala LS 3.8L #4 cylinder skip VIN: 2G1WH55K7Y
Removed value cover for # 4 cylinder. Checked valve springs. Did not see any one of them to be broken. Did leak down test 38% really closed to a good cylinder.Could the spring be weak and still have compression ?. Is there any test I could do to see why there ...
2004 Chevrolet Suburban 1500 Z71 5.3L abs VIN: 1GNFK16Z64
Hello, when turning and taking off this Suburban will intermittently activate the ABS and the pedal will pulsate. Also the engine loses power as if it were being shut down. The stability light on the dash will come on sometimes but not always. So far I have sc...
1997 GMC Yukon SLE 5.7L fuel system. VIN: 1GKEK13RXV
I would like to start off by saying thanks for any help.I am new to IATN. The symptoms are,vehicle will sometimes start hard, but idles completely normal,and when you slowley give it throttle it climbs to rev limiter normaly. If you step on the pedal as if you...
2006 GMC Savana 2500 6.6L MIL Lamp on VIN: 1GTGG25236
Vehicle runs great and starts fine but the wait to start light never comes on. I can comand the light on with the scanner but it still does not turn on. I have checked the wire at the cluster (that the pcm controls) and can watch the pcm toggle it to ground (t... Trouble codes: P0381 (Wait to start light control circuit)
2008 GMC Yukon SLT 5.3L Hesitation VIN: 1GKFK13018
Vehicle has extended crank times. No codes. Checked fuel pressure, within spec. When checking fuel pressure, as soon as engine is shut off fuel pressure drops to 0 istantly. After first key cycle, pressure will not build with continued key cycles. Fuse bo...
2006 Pontiac Montana SV6 3.5L warning indicator VIN: 1GMDV33L06
This is strictly a have you been there question for you GoodWrench guys. Got this '06 Montana with a 3.5 that was sold by used car lot. Customer brought car back a couple of weeks later saying the oil pressure warning in the ipc information center had come on....

Fixes & Summaries for GM
Fix/Summary Answers
1970 Buick Skylark 7.5L Turbo 400
Thankyou Peter, Ernest, Don, Al, Dwayne, Lane, Allen, John and all the others that posted. After reviewing all my options I concluded that 1st, I didn't have the room at home or work to perform the repair on this trans myself. 2nd, I know cleanliness is a big ...
2003 Buick Regal LS 3.8L No Start VIN: 2G4WB52K33
thank you everyone for great support and helps. I did end up replacing complete engine wiring harness.found sevseal burnt and damaged wires near battery and air filter housing whitch main ecm harness.also found huge roddens nest near air filter housing.this ca...
1998 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC1247W
Well , thanks everybody for the help , I forgot to mention that I had replaced the IPC with a junkyard part and it made no difference ( according to MOD the IPC is in charge of and houses the passlock software and then sends the signal to the ecm to start the... Trouble codes: U1016.
2005 GMC Sierra 1500 Denali 6.0L Charging VIN: 2GTEK63N65
Thanks again to all. As was suggested and as we thought the alternator was the culprit. Actually, I should have worded my request for help differently as our tests and the voltage fluctuations pointed to the charging system, I just never saw one act that exact...
1997 Oldsmobile Aurora 4.0L pops back/intake VIN: 1G3GR62C4V
The thing that struck me about this problem was that the computer never showed a missfire at all. The only item that showed any problem was the long term fuel trim was positive on the front even bank of cylinders and the back was perfect. What we found when lo... Trouble codes: P0741, P00, 420A, P1139, P1537.
2008 Saturn Astra XE 1.8L Ipc VIN: W08AR67158
I got this one done... Thank you Brian! Anybody programming an Astra you should know everything will appear to be going normal i.e. there won't be any warnings telling you to back out and use a different procedure, or remove fuses etc... but it won't work. I w...
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