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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 24, 2012
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1994 Buick Park Avenue 3.8L No Start VIN: 1G4CW52L4R
looking for some ideas...this park avenue cranks but will not start, i checked the basics,i have fuel pressure but i do not have spark, i dont have a scope to check the cam and crank sensor but i do notice that when i crank it the rpm gauge is moving. customer...
1995 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY5292S
Vehicle came in running rough, 2 cylinders misfiring. Had history code 36 EGR out of range and current code 105 Brake booster vacuum too low. Cleared codes and tested. Traced misfire problem to #4 &6 cyls. Replaced PCM (re man Delphi)due to no injetor signals ... Trouble codes: 80 (Position Sensor TPS and idle relearn)
1999 Cadillac Escalade 5.7L Accessories VIN: 1GYEK13R4X
We did brake job & new battery, customer picked up the truck & brought it to us his compliant is the sunroof wont open by one touch,but it will close by one touch of the switch, he said it was working before, i check all data & mitchel no info what so ever,I k...
1991 Chevrolet Corsica LT 3.1L Poor Idle Quality, Surge, Cuts out, Stall, MIL Lamp on VIN: 1G1LT53TXM
afteer several minutes running. Sets code 53. and 15. system over voltage. and ect reads -38' New PCM. New ECT. Trouble codes: 53 (system over voltage)
1996 Chevrolet Blazer 4.3L Poor Idle Quality, Hesitation, Cuts out, MIL Lamp on VIN: 1GNCS13W1T
Good Morning , This S-10 blazer will run good once warm, all day long. Let it sit for a day or more,it start's rough, idle's rough ,drive it, loss of power,give it alot of throttle and it clears up. It will stutter on accel. until warm then run's good. The cu... Trouble codes: P0300 (Random mis-fire)
2001 Chevrolet Silverado 1500 5.3L steering VIN: 1GCEK19T71
This one has us all boggled. The steering when turning left Intermittently binds up. It does not bind to a stop, only gets very hard. Usually only when it is cold. It does do it at all speeds, forward and reverse. It tends to go away once it is warmed up, and ...
2004 Chevrolet Colorado LS 3.5L 4 wheel drive VIN: 1GCDT13694
when press the 4 hi/low switch, the light just flashes and heard a clunk noise from under. When put on 2wd drive the light flashes a couple times than stay solid (normal). The drive shaft to the front differential was spinning but not engaging in 4 hi/low. I w...
2004 Chevrolet Silverado 2500 6.0L wheel speed sensor VIN: 1GCHK29UX4
Truck came in for false ABS activation at the end of low speed stops. Drove with scan tool and found RF sensor does not read until 7 mph and drops out before the other 2 while braking. Have already checked resistance of wires from sensors to ABS module. Checke...
2006 Chevrolet Trailblazer LT 4.2L headlamps VIN: 1GNES16S26
06 trailblazer, headlamps go out,the run (tail) lamps and interior (instrument and dash) lamps operate properly. it has a autoheadlamp switch but headlamps go out with it in the on position. installed new switch and bcm (programed) and still not fixed. bcm has...
2007 Chevrolet Malibu LS 2.2L steering column VIN: 1G1ZS58F07
This is a "pop" noise hat can be felt in the steering wheel especially when turning to the left. When the column is grasped under the dash, the pop can be felt. There aren't too many other components that this can be coming from. If the column is disconnected,...
2008 Chevrolet Impala LS 3.5L MIL Lamp on VIN: 2G1WB55KX8
Hi all. I have this Impala that has been to our local dealership and they cant seen to figure this out so somehow it got dumped on me. I have the P1174 code. The fuel trim is way off. I have checked fuel pressure 55psi running, smoke test the induction system ... Trouble codes: P1174
1998 GMC Sonoma SL 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTCS14X4W
Good morning everyone, I have a 98 Sonoma 4.3x that I purchased for my son as a first vehicle. When i bought it the owner had been chasing a running problem and replaced many parts trying to replace it on his own and then the engine finally spun a rod bearing ... Trouble codes: P0300 (multiple random misfire)
2001 GMC Yukon SLE 5.3L insterment VIN: 1GKEK13T71
battery light on cant get any comunication out of computor. truck runs fine . fusess test good. have power and ground at aldl. tryed modus and a poket scaner.
2006 GMC Sierra 1500 SLE 5.3L Compressor VIN: 2GTEK13Z96
This one has ac issues. Well customer was complaining about ac not working. Well when i first saw it the system was working properly but after a while it quit the compressor shut off and the blower was acting funny i could turn the speed up but the blower went...
2002 Oldsmobile Alero GX 2.2L Timing Chain VIN: 1G3NK52F72
I have a car that has a tensioner for the main timing chain that keeps failing. Car came in 2 months ago with failed tensioner in fully retracted position. Re-set timing and installed new aftermarket tensioner. Car returned one month later with same problem. W...

Fixes & Summaries for GM
Fix/Summary Answers
1967 Chevrolet Camaro 5.3L Hesitation, Stall
Hello and thank you all for the help and information. Most of you were correct when you said I needed to have the computer reprogrammed. I talked to Ed at Fastchips and he did a custom chip for me and after installing it it was about 80-90% cured. It no lon...
1968 Chevrolet Chevelle Malibu 5.3L Wiper Motor VIN: 11327W4568
After getting motor timed right got installed. Seems the biggest problem was the ground at the switch. Finally figured out wires at the motor. All works great now.
2002 Chevrolet Malibu 3.1L ignition control module VIN: 1G1ND52J12
Well fellas just gonna have to admit my mistakes. 1. I should have bought a scope awhile ago. 2. Don't always trust scan tool data. Just because a sensor shows a signal doesn't mean it's right.!!! Turns out the 3x-7x(which ever you prefer) ckp sensor on the...
2004 Chevrolet Impala 3.4L no speedometer
Customer took to dealer. One said that he has driven 2 or 3 to dealer and they reprogramed it with no problems. Some said to buy a stepper motor($10.00) for speedometer and solder it in to the printed circuit board. joe had good advice,he said to take the c...
2003 GMC Sierra 2500 HD SLE 6.6L brake pedal VIN: 1GTHK23153
IATN and it's invaluable members have come through once again! And on the very first response! Keith from WA nailed it. I did just what Keith suggested, took it out on the road and stood it on its nose with a hard ABS stop. Apparently a piston gets stuck in...
2005 GMC Yukon XL 1500 SLT 5.3L Radio VIN: 1GKFK16Z25
Thanks for all the help! I will hopefully see this Yukon next month to look at the rsa module and wiring. I will let you know what I find.
1996 Oldsmobile Silhouette 3.4L heater core VIN: 1GHDU06EXT
Hi Everyone, Thank you to all of you for responding. I checked the pot metal valve that attached to the upper manifold. It was clear. I had a blockage in the hose at the connector where the plastic meets the metal on the passenger side of van near firewall...
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