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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 3, 2006
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Open Help Requests for GM
Help Request Answers
1994 Buick Skylark Custom 3.1L egr VIN: 1G4NV55M6R
Hi all gurus out there! This one has us stumped AND all the experts around here are equally mystified. This is a regular, long-term customer that has traded with me for 10 years now. This 1994 Skylark failed emissions in November due to high NOX. A new Car-Que...
1994 Buick Century Special 3.1L shifts poorly VIN: 1G4AG85M5R
Hi Group - I need help with code PO 501 ( Vehicle Speed Sensor) The speedo runs backwards when accelerating, and idle flares between shifts. Scanner troubleshooter is vauge, does anyone know a common cause? Thank You, Jim
1995 Chevrolet Caprice Classic 5.7L heat VIN: 1G1BL82P7S
flushed heater core and cooling system. coolant was very dirty and had no heat. after flush we have heat intermittently and vehicle will also over heat. i beleive there is trapped air is there special procedure to bleed this reverse flow system? or any other i...
1995 Chevrolet Lumina 3.4L engine VIN: 2G1WN52X75
Lady's & Gentlemen: I have a good one for all you folks. I hope I have the answer before any of you get a chance to reply but ??? What we have is this 3.4 dohc lumina that we replaced the timing belt and now the engine seizes up @ 2/3rds of a revolution. I kno...
1995 Chevrolet Monte Carlo LS 3.1L no-crank VIN: 2G1WW12M8S
Hello! This vehicle does not crank over! No power to purple wire @ starter! Checked power @ ignition switch, nuetral safety switch ect. = ok. It appears that anti-theft relay yel/blk wire is not being grounded by the theft module! I have 12 volts on that wire ...
1998 Chevrolet C3500 Cheyenne 6.5L Misfire VIN: 1GBKC34F8W
hi guys,, 6.5 turbo diesel problem ,, what a surprise huh! 98 6.5 electronic,, customer had been using dyed fuel , several months ago advised him to use cleaner and start using clear fuel, problem did not improve, but got worse,, orig complaint, running real r... Trouble codes: 263 (misfire see text many misfire codes)
2002 Chevrolet Astro LS 4.3L No Start VIN: 1GNEL19X12
Hi, thanks in advance for any help. This Astro was towed in with a crank no start. We have fuel pressure, injector pulse, spark, good compression, crank reference...we are at a loss, there are no codes with our OTC or our snap on scanners. We do have a flash r...
2004 Chevrolet Express 2500 4.8L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCGG25V24
june of last year , van showed up with po200 and po300 codes. found cyl # 2 misfires at 150,000 in history and current counter climbing. backprobing at pcm found no injector driver circuit. replaced pcm with ac delco reman and shipped it running great.flash fo... Trouble codes: P0200 (injector circuit failure), P0300 (random misfire)
2004 Chevrolet Malibu LS 3.5L Electronic power steering VIN: 1G1ZT528X4
Hello fellow techs, Have a problem with this car's electronically assisted power steering. Every once in a while, it will completely stop providing power assist. Vehicle stays running, and there are no other symptoms. If you shut the engine off, wait 30 second...
1995 Oldsmobile Cutlass Supreme SL 3.4L Poor Idle Quality, Idle Fluctuation VIN: 1G3WH12X6S
There are no diagnostic code present. Upon initial check up, vehicle had a major vacuum leak at vacuum hose near rear engine compartment area. Corrected vacuum leak and also performed tune-up service, as maintenance requirment. Vehicle still has a idle fluctua...
1998 Oldsmobile Silhouette Premiere 3.4L abs light-traction light- battery light on intermi VIN: 1GHDX03E7W
abs light and traction light come on intermittenly battery light comes less frequently transmission will not shift correctly when lights on- traction control affects it?? battery voltage was at 18.3 volts on scanner one time test voltage at abs relay- 14.4 at ...
1998 Oldsmobile Intrigue 3.8L abs codes VIN: 1G3WH52K3W
Hey guys and gals, this one is eating my lunch. Got this jewel in a while back for traction control, ABS and Service Vehicle Soon lights coming on. We had replaced the right front hub/abs sensor assembly quite awhile back for a noise problem. We ended up repla...
1995 Pontiac Bonneville SE 3.8L Poor Idle Quality VIN: 1G2HX52K7S
Hello to all members, I have this bonniville that came to me with idle problem when he has driven it for a while. Runs good when cold. Whent to connect scanner to retreive codes, couldn't establish communication. Tried scanner on similiar vehicle and works oka...
1999 Pontiac Grand Prix GT 3.8L front end VIN: 1G2WP12K4X
customer complained of ticking noise, when driving over rough roads, consistently on roads with tar sealed crackS. front end makes a ticking noise, we have replaced struts, and checked out all the parts, no parts with apparent excess movement were found. any i...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick LeSabre Custom 3.8L Shaft or rack VIN: 1G4HP54K21
Hi everybody. Thanks for all the replies. Turns out after changing the shaft. I still had the clunk. I put a rack in it and the clunk is gone. I think the key here was the kick back. Thanks again. & Have a great day. Glenn
1998 Cadillac Seville STS 4.6L Interior lamps VIN: 1G6KY5496W
correction: wiring at ambient light sensor. How - We retesed all the GM testing procedures on the interior lamp system with no faults found. Inspect wiring connections and grounds as per replies given. The tech determined that the DIM (dash intergrated module)...
1987 Chevrolet Caprice 5.0L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G1BL51H5H
Thanks to everyone for all the help I got my caprice on the road today. I found that the ECM ground on the back of the passager head was not making good contact cleaned and retighened it and it solved everything.Some times the simple things get you the. Thanks...
1995 Chevrolet Lumina 3.1L Unknown VIN: 2G1WL52M8S
Well it's fixed and gone down the road, had 3 replies, Dave said a plugged injector, Ron said a bad convertor valve could cause it, Kent said overheating caused by a band to tight could cause it but the problem was the gasket between the channel plate and case...
1998 Chevrolet S10 LS 2.2L fuel gauge VIN: 1GCCS1947W
I would like to thank everyone for there help. I can't explain why the elec. part of ign. switch fix it but it did. With help from you'll and checking grounds I just so happened to wiggle wires going to ign switch and found a faulty connection internal on the ...
2000 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY32G5Y
First let me say thanks for the help on this difficult fix. i will probably never see this again. i will be brief in my explanation. the MAF was dirty as expected, the pump had great volume - no restrictions, the solenoid was operating as designed, the vacuum ... Trouble codes: 0410 (air injection system).
2001 Chevrolet Silverado 1500 4.3L No Start, Misfire VIN: 2GCEC19W21
2002 Chevrolet Express 2500 5.7L voltmeter VIN: 1GNGG25R02
I waited as long as I could to post this fix because of the intermittent nature of the problem. I actually never saw any of the symptoms personally. A new ignition switch appears to have solved the problem. It has been over two weeks since it was installed and...
2002 Chevrolet Tahoe LS 5.3L Poor Idle Quality, MIL Lamp on VIN: 1GNEK13Z42
I appreciate everyone's input and help with solving this problem. I apologize for the delay in responding to this email. The correction was in fact the intake manifold gasket, which we purchased from the dealer. There is a revised gasket which corrects this co... Trouble codes: P0171 (Fuel trim system lean bank one), P0174 (Fuel trim system lean bank two).
2003 Chevrolet Silverado 3500 6.6L Engine VIN: 1GCJK3318F
Well I'm gonna call this fixed because it's out of my hair. We were looking for a common issue to make the local dealer techs at least look at it. Thanks to Randy [...]. that mentioned injectors. The GM guys had to admit there could be a problem & that t...
2002 GMC Envoy SLE 4.2L converter lock-up, shift VIN: 1GKDT13S52
Hi folks, I got 3 replies. One fellow suggested I had a problem with shift solenoids, which I didn't. Kevin in PA suggested that the electo-viscous fan was staying engaged, which it wasn't...confirmed after road testing. Another guy suggested that I coul...
1998 Oldsmobile Bravada 4.3L MIL Lamp on VIN: 1GHDT13W2W
Thanks to those that replied. The fix was putting new terminals on the body harness. There was not a good enough connection on one of the three. Trouble codes: P0446 (evap system vent valve performance).
1999 Oldsmobile Intrigue GL 3.5L tcc VIN: QWXF622322
thanks for the replies transmissions isnt my forte .the problem was the gearshift pressure sensor in the side cover as far as the snap on scanner test for lock up was a bum steer.
1996 Pontiac Bonneville SE 3.8L Hesitation, Misfire VIN: 1G2HZ52K2T
well thanks to all you guys who gave me alot of ideas.Did not believe wat it was , i took those metal caps off the end of the plug wires and that fixed it. Someone before me had changed the wires so i ruled them out. I went to the dealer and got some oem wires... Trouble codes: P0300.
1999 Pontiac Grand Am SE 3.4L Front Calipers VIN: 1G2NE52E1X
Hi Everyone, Thanks for all the help, there were some good ideas. One person had seen a defective aftermarket master cylinder cause the same symptoms. Someone else suggested that ballooning brake hoses could cause this problem. It was suggested that in spite o...
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