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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 26, 2008
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1989 Buick Regal Custom 3.1L hard starting VIN: 1G4WB14T0K
When this car is ourside (26 deg f) it will start and die. If you hold your foot on the gas peddle it will stay running. Once it warms up a little it will run just fine. We pushed it in once and let it sit in the shop for 30 minutes and it started and ran just...
1997 Buick Park Avenue 3.8L Hesitation, Cuts out VIN: 1G4CW52K3V
The main thing is when you go to accelerate it bogs down and the Long term stays at 10 to 16 the ox goes down to lean when you let up it goes into the next gear. lightly it runs fine. The customer says that it does it more when it rains??? I can make the bog g...
1998 Cadillac Catera 3.0L No Start VIN: W06VR52R7W
car came in for a check over customer said it had been sitting awhile looked it over did a few maints items and then replaced the battery it was weak the car ran good till the battery change now it will not start. checked all fuses all were good checked all my...
1997 Chevrolet C1500 Cheyenne 5.7L brake pedal VIN: 2GCEC19R8V
1997 chevy truck 1\2 ton, did bleed all 4 wheels, did not bleed abs unit, truck has a very soft and low pedal. truck came in for a intermittent hard pedal and sinking to the floor. test drive and confrim, air was found in rear brake lines, found master cylinde...
2003 Chevrolet Suburban 1500 LT 5.3L Unknown VIN: 1GNFK16Z83
Hello, This truck came in for poor brake performance. Found rear brakes worn out and not working properly. Installed rear brakes but still have the same problem. When you step on the brake pedal about a 1/4 of the way down the pedal gets "hard" and you have ve...
2004 Chevrolet Cavalier 2.2L Day time running light VIN: 1G1JC52F74
Hi all, This car came in this morning with day time running lights inoperative. we notice that when the key is turn to the ON position (either engine ON or OFF)we ear a clicking sound (relay?) several time in the lower left side of dash and the day time runnin...
2005 Chevrolet Tahoe LS 5.3L Accessories VIN: 1GNEK13T65
Hey all,this Tahoe has a drivers seat heater problem,(no codes)you can press either switch they will light up and then shut off(about 5 sec),pass side works fine until you turn drivers side on then pass side switches off. You can hear seat module click on then...
1997 GMC Yukon SLE 5.7L Pinging / SparkKnock VIN: 1GKEK13R3V
Engine was pinging when presented, reasonably constant, suspected EGR problem... Note: MIL lamp was disabled (NOT HERE!) and is not functioning! 1)Checked for codes found; P1870 TCC slip & p0300... Scan data shows aprox.250-290 rpm tcc slip (high gear with ... Trouble codes: P1870, P0300 (Random Multiple misfires)
1988 Oldsmobile Cutlass Ciera 2.5L No Start, Poor Idle Quality VIN: 2G3AJ51R9J
ecm sees mat as +284f engine cold-unplugging mat sensor causes ecm to see +304f-5volt signal to sensor ok& ground wire ok-jumping mat harness causes ecm to see -40f. this seems opposite of what should happen.mat sensor & ecm replaced -no change in test results...
1998 Oldsmobile Aurora 4.0L shift interlock VIN: 1G3GR62C6W
weird one here guys. i have a customer that states the shifter button will not depress until the engine is up to operating temp. it started 2 weeks ago and it take 15-20 minutes until the shift button can be depressed to select a gear..ie drive, reverse...ect....
2001 Oldsmobile Aurora 3.5L drivers blend door VIN: 1G3GR64H31
driver side blowing cold air. blend motor wont move when commanded.
2003 Oldsmobile Alero GL 3.4L theft system VIN: 1G3NL12E93
Hi all. I have this alero in for an intermittent horn going off at different times. I have not been able to duplicate the concern. There are several codes in multiple modules. In the bcm history is a B2752 for a horn relay coil circuit low. I am able to manual...
1993 Pontiac Firebird Formula 5.7L MIL Lamp on VIN: 2G2FV22P8P
start and stall all parts listed Trouble codes: 41 (optispark ignition system open or shorted)
1996 Pontiac Grand Am SE 2.4L engine
Any help would be great this is my work car,it started out just stalling every once and awhile so i replaced the crank sensor and cam sensor and also tried a used pcm and a new ignition module and it barely runs at all now.
2001 Pontiac Sunfire SE 2.2L dash guages
This car intermittently drops the guages,speedometer & tachometer to "o". If the h/lites are on they also significantly dim down. I cannot duplicate in the shop & the condition doesn't last but at the most so far about 30 seconds. Wiring diagram shows all the ...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Buick Rendezvous CX 3.4L Interior VIN: 3G5DA03E34
Turned out to be the wire harness running through the winshield wiper cowling area, the wiper arm would rub on it and blow that fuse.
1988 Chevrolet Caprice Classic Brougham 5.0L Excessive Emissions VIN: 1G1BU51HXJ
Most of the replies were to go back and retest the tps. they thought 3.5 volts at cruise was to high.I decided to take the tps out of the system. I removed the link to the accellerator pump and tps.We then put the car on the dyno at 15 mph 1300 rpm at 50% load... Trouble codes: 23 (mixture control solenoid one time), 44 (lean one time).
1995 Chevrolet C3500 5.7L shift solenoid A VIN: 1GBGC34K8S
Thank you all who replied to this problem of mine. For the short answer the PCM was the problem. Chevrolet sent me a reman unit, and it worked for 2 miles, and then the engine started to run like dog poo. After getting a second one all was well with the tru...
1998 Chevrolet Express 1500 5.7L starter block VIN: 1GBC6G55X1
Here it is, the customers brother who runs a fab shop fabricated a bracket to go from the starter to the thansmission housing and the pan bolts to hold the starter in place. its working for now but we will see...
2000 Chevrolet S10 4.3L starting VIN: 1GCCT19W1Y
Just as many suggested, the fuel pump was the culprit here. By measuring the pressure at the filter under the vehicle and making certain there were no leaks in the lines, the pressure would not hold. It dropped off at the same rate as before, while pressure on...
2002 Chevrolet Impala 3.4L on/off VIN: 2G1WF52E22
Thanks for all the help from the iatn members -this vehicle is fixed per the buget way -heater fan blower is working fine and owner is ok with 1 hours labor and we took out the cruise control fuse ! thanks again for all the in put and help -joe
2003 Chevrolet Silverado 1500 5.3L engine noise VIN: 2GCEK19T33
well still have a noise at or above 2000 rpm tried a new flywheel from gm old one had a line around the bolt at the flywheel looked to be cracking.the new flywheel was twice as thick as the original humm but still have noise customer not going any further than...
2004 Chevrolet Silverado 1500 4.8L door locks VIN: 1GCEK19V44
Thanks to all who reolies. Barry [...] indecated for this truck Driver control module in the door, control driver side and passenger door control by pass door module. thanks agai...
2007 Chevrolet Suburban 1500 LTZ 5.3L reverse lights VIN: 1GNFK16367
yep, relay for the backup lights is inbedded inside the fuse box and is non-serviceable. Imagine that! Ended up ordering a new fuse panel for 300.00!
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