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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 9, 2010
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Open Help Requests for GM
Help Request Answers
1991 Buick LeSabre 3.8L Excessive Emissions, No Start, Stall VIN: 1G4HR51C2M
nice simple car. ya right. here is my problem. this car was towed in not start found very flooded engine. changed plugs and oil and car started but ing. wires were arcing, put on wires runs fine for about 2-3 minutes start to buck and surge and stalls. disconn...
2000 Buick LeSabre Custom 3.8L heat control VIN: 1G4HP54K1Y
complaint of no heat or slow to warm up.checked cooling system,runs normal 190-200 degreesonce witn engine at temp set heat at full hot.checked for 10 minutes,still blowing cold.heater hoses hot.next day pulled glovebox and checked temp actuator.was inop,power...
2005 Cadillac STS 3.6L throttle VIN: 1G6DW67785
Hello fellow techs! Customer complaint is lunging or accelerating by itself. Customer said she actually drove it through her garage last year. Sometimes when she is going approx 25MPH. the car will lunge forward suddenly and then stop doing it quickly. I cant ...
1994 Chevrolet Camaro Z28 5.7L Poor Idle Quality, Cuts out, Misfire VIN: 2G1FP22PXR
I'm looking for some fresh perspective on this car. The customer brought the car to us a few months ago as a no-start. I diagnosed a faulty optical sensor in the distributor (not the first time in this particular car). Customer towed it home and replaced the O...
1995 Chevrolet C2500 7.4L No Start VIN: 1GBGK24N9S
Hello all, a little brain teaser for you. I am pulling out my hair. What happens is on occasion this truck will not start, no spark from coil. I plug another distributer in and I get spark by spinning it by hand. Also if I pull out the "no spark" dist. and spi...
2002 Chevrolet Astro 4.3L alternator VIN: 1GNDM19X52
Not charging, replaced alternator with reman. (which could be the problem). Voltage stays at battery voltage, app. 11 volts. Gage does function. Battery indercator light on a few seconds, off a few seconds and keeps repeating. The 1638 code is F termental circ...
2004 Chevrolet Classic 2.2L T.Chain tensioner VIN: 1G1ND52F24
Replacing my first updated timing chain tensioner on this 2.2 and can not understand how to release it after in is installed. I have Alldata which tells me to use a rubber tip tool and give the chain a sharp jolt diagonally downwards to release. I have done th...
2004 Chevrolet Silverado 2500 HD 6.0L No Start, Stall VIN: 1GCHK24U14
Thanks for any help, Before I replace the PCM I need to see if I have missed anything. The PCM on this truck will "drop out" or loose communication about 10 seconds after the key is turned on, cycle key off then on again and it will communicate for another 10 ...
2006 Chevrolet Silverado 1500 LT 5.3L Misfire, Poor Fuel Economy VIN: 2GCEK13T16
vehicle came in with check engine light on. scanned and found p0300,p0303,p0304 checked and found worn plugs. replaced plugs and wires and still misfiring. swapped coil 4 for 2 and misfire stayed in cyl 4. put noid light on and saw consistant pulse. swapped in... Trouble codes: 300 (multiple misfire), 304 (cyl. 4 misfire), 303 (cyl. 3 misfire)
2005 GMC Yukon XL 1500 SLT 5.3L Stall, MIL Lamp on VIN: 3GKFK16Z05
intermitten lost of communication,abs and red brake lights come on,the drivers door lock cycles and the mil comes. the words reduced engine power mode comes on the message center.at times the veh. stalls and will not start but most of the time it starts back u... Trouble codes: U0107, C0237
2005 GMC Envoy SLE 4.2L transfer case VIN: 1GKET16S05
Replaced front differential bearings last week. Cause of failure appears to be from encoder motor engagement and disengagement on decel. Happens an decel in auto 4 wd position at speeds under 45. tire size and height are the same, both propshaft speed sensor r...
2008 GMC Sierra 1500 SLE 5.3L noise VIN: 3GTEK13368
this truck has a chirpeing noise by the bell housing already removed belts noise still there. sounds like the flywheel brally touching some thing i removed trans and fly wheel see nothing . sounds like a slightly cracked flywheel. found nothing should i get it...
1994 Pontiac Trans Sport 3.8L Surge, Stall, MIL Lamp on VIN: 1GMDU06L9R
need help with this van,intermittant stall,replaced egr valve for problem,seemed to improve,stall but has an idle surge and o2 sensor volts hang at .438 millivolts will go to closed loop,while driving but fuel trims jump to 180 while driving.replaced o2 sensor... Trouble codes: 134 (o2 sensor circut open)
2002 Pontiac Sunfire GT 2.2L Clutch VIN: 3G2JB124X2
This car will not shift.The last time this happened we bled the hyd clutch and after four to five trys it worked great and shifted great untill today.This time it will not come back by bleeding.The clutch dosent seem to slip but the pedal will not completely d...
2006 Pontiac Grand Prix 3.8L MIL Lamp on VIN: 2G2WP55246
To run tests for the secondary air injection I need to test the (2) relays for this circuit.Alldata and Mitchells On Demand do not show me a location for the Air pump relay and Air pump valve relay.I would like to test these relays to determine what is wrong w... Trouble codes: P0411 (Secondary Air Injection)
2006 Saturn Vue 3.5L torque converter VIN: 5GZCZ63416
After the vehicle was gone for the weekend, customer called back with a check engine light on. P0741 was present, and the TCC was not applying, even though it was being commanded to do so. Did the diagnostic procedure for the code p0741, and found the tcc sole...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac DeVille DHS 4.6L tcc lock up VIN: 1G6KE54Y53
Car is fixed. Had replies that comfirmed the valve body problems on these. Also had replies that talked about convertor isssues, and problems with the seals and tranny parts I had already replaced. Special Thanks to Edward from Connecticut. He Explained what h...
2008 Cadillac CTS 3.6L Pedestrian Impact Detection Module VIN: 1G6DR57V68
Thanks for all of the replies. At this point we are still working with GM TAC to resolve this issue. Once it is resolved, I will try to update this post as to the solution. (Not sure if it will allow me to update a post that has been closed, we'll find out ...
1981 Chevrolet LUV Sport 1.8L cv axle removal VIN: J8ZBR14N6B
Thank all of you that repilyed.I beat and bang and pulled for two days until my tongue fell out. I finally gave up and turned this four-wheel drive unto a two-wheel drive. Customer very happy. Thanks again everybody.
1986 Chevrolet C70 C7D042 6.0L Unknown VIN: 1GDG7D1B4G
Well, after the overwhelming number of responses I received, and some Google Searching, I'm pretty confident that I am correct. Thanks for the responses guys.
1992 Chevrolet K2500 Silverado 5.7L Overdrive VIN: 2GCGK29K6N
Well it's gone but not repaired. Thanks to all that replied. With the information given by you guys I was at least able to figure out what the problem was, even though the customer didn't go for it. Noah and Jerry, you guys were right on about the TCC slip %. ...
1995 Chevrolet Cavalier 2.2L fuel odor in car VIN: 1G1JC1245S
Fuel injectors/seals were faulty.Replaced injectors and seals, and no problem since. Thank you for all the help!
1999 Chevrolet Astro 4.3L Starting VIN: 1GNDM19W7X
thank to all. replaced key, ignition switch and pass modual. light went out and van starts every time. thanks.
1999 Chevrolet Express 3500 5.7L prndl VIN: 1GBJG31R8X
Sorry for the delay. Customer needed this van for his business so we just got it back to "dive" into it. Most replys suggested it was the selector shaft range switch on the side of the transmission or the instrument panel cluster and 1 or 2 mentioned the ignit...
2003 Chevrolet Malibu 3.1L back-up lights
Since this problem only happens in reverse and I could not promise to keep the repair CHEAP...go figure... the customer is going to deal with it for now. Any change down the the road and I will advise. Thanks for the help.
2005 Chevrolet Silverado 2500 HD 6.6L Stall VIN: 1GCHK23295
Was headed on vacation so I sent the truck to the local dealer. They replaced the accel. pedal pos. sensor. Thanks for the replies. Trouble codes: P0642, P0700, P1404.
2006 Chevrolet Cobalt SS 2.0L MIL Lamp on VIN: 1G1AP14P26
Sorry,I know I closed this question with a fix but I must have done incomplete,anyway THANKS to all with your help.The fix was simply to replace the Bank 1 Sensor 2 Oxygen Sensor with a Dealer O.E.M. sensor.I originally used a NAPA o2 sensor to replaced the on... Trouble codes: P0141 (Heated Oxygen Sensor Bank 1 Sensor 2).
2007 Chevrolet Trailblazer LS 4.2L ebcm VIN: 1GNDT13S67
Well this one is fixed. I reprogramed the ebcm with a tech 2, using replace and reprogram option, which is exactly what I did with the the Snap On Passs Thru. It worked perfect the first time. I cannot explain why the Snap On caused this problem it programed t...
1996 GMC C3500 Sierra SL 6.5L Stall, Lack of power VIN: F5TJ514291
Replaced the injector driver module & remote mounted it seems to have fixed the problem .Haven't heard back from the owner so I'd have to take that as a good thing. Thanks for the help Tim
2004 GMC Savana 3500 6.0L oil consumption VIN: 1GJHG39U34
Did some test that I was sent from other techs on IATN and came to conclusion that the vavle stem seals were bad. I replaced all seals and did a tune up at same time. I made sure all passages to crankcase vents were clear also. Have heard nothing back from cus...
2001 Oldsmobile Alero GL 3.4L radio VIN: 1G3NF52E21
Thanks to all who helped, the customer took the veh. back to the used car lot where she got it, hopefully she went elsewere to buy one. Thanks again.
2002 Pontiac Grand Am GT 3.4L cruise control VIN: 1G2NV12E82
I replaced the stop light switch at the brake pedal, and replaced all stop lamp bulbs. One of the center high bulbs was black but still working, I thought it was an intermittent, and replaced all the bulbs. However it dropped out again, so I replaced the stop ...
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