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Prev Professional Automotive Repair Technical Discussions for October 9, 2006
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Open Help Requests for GM
Help Request Answers
1988 Buick Skyhawk Custom 2.0L headlights VIN: 1GCDT14Z7R
Customer, little old lady, presented this 88 skyhawk with hideaway lights the intermittently work. They are electric and can hear both motors run, but sometimes they close and somtimes they don't. Sometimes one or the other will close. Linkage looks ok, and lu...
1999 Buick Century Custom 3.1L Hesitation, Cuts out VIN: 2G4WS52M0X
I inherted this one after it has been to 3 other shops. It cuts out like hitting rev limiter at 3000 rpm. I have scoped 24x, 7x, 3x, cam sensor, IC, and Injectors. The only thing I am seeing happen is when scoping injector amp draw the signal goes almost flat,...
2002 Cadillac DeVille 4.6L Light VIN: 1G6KD54Y12
Hi Guys! This is the Caddy that we put the engine in couple weeks ago. The engine runs fine and all is well as far as that is concerned. The customer has had a problem with warning lights on the dash for some time and has asked us to look into it. Both the A...
1992 Chevrolet Astro 4.3L No Start, Stall VIN: 1GKM19Z1NB
This van will run PERFECT for a while, then randomly it will die on decel. It will crank and not start for 1min.-[...]. and then starts and runs perfect again. I was able to test one time and I had great spark, and fuel pressure but no injector pulse, I ha...
1995 Chevrolet K2500 Cheyenne 6.5L No Start, Misfire VIN: 1GTEK14S1S
hello thanks in advance for any help. we have a 1995 6.5l torbo diesel. on cold start very hard to start. misfires and large amount of white smoke. runs good when warm but has noticable amount of black smoke from tail pipe under acceleration.runs bad for up ... Trouble codes: 36 (injection pulse width response time long)
1995 Chevrolet C3500 Cheyenne 7.4L Poor Idle Quality, Hesitation, Surge VIN: 1GBKC34N4S
The truck has a bad idle surge(comes & goes) - When acting up, truck starts running lean, although o2 shows high(goes more towards 1105 mv)*** When you disconnect the field wire for the alternator the problem goes away & idles great. We tried an Ac delco alter...
1996 Chevrolet C1500 Suburban 5.7L volt guage/alternater VIN: 1GNFK16R6T
Hey guys this one has been a real head scratcher for me. We put an alt. on becuase it was not charging enough. At first we used an after market and the customer took the vehicle and when it came back the alt was fried, no charging. We tested the battery and wa...
1996 Chevrolet Monte Carlo Z34 3.4L instument cluster and radio VIN: 2G1WX12X7T
We have this 96 monte that came in with the insturment lighting inop and also when you turn on the switch the radio light goes out also. If i manually power up the raido circuit it operates correctly but still no instrument cluster lighting. HELP! i am about r...
1997 Chevrolet Express 1500 5.7L Stall VIN: 1GBFG15R6V
After replacing module & coil all was fine for a couple days now vehicle back same problem anyone have an idea fuel pressure is good vehicle just shuts off
1998 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13WXW
Hi Guys, Got this Blazer that wouldn't start after the customer stopped to get gas. Its getting good spark, and fuel at the injectors. Tried pouring alittle gas in the air valve and it would start and run for a second. Injectors are getting power on the pin...
2002 Chevrolet S10 LS 4.3L Brake, Rear Turn VIN: 1GCDT13W22
I have a 2002 S-10 that both rear brake lights do not work but the middle 3rd brake light works. The rear turn signals also do not work but the front work. The turn signals do flash fast probably because only the front is working. I looked at the wiring diagra...
2004 Chevrolet Impala 3.8L temperature actuator VIN: 2G1UH52K44
Hey Techs! I have a question for all you GM techs. Im having a problem with the left side climate control actuator opening the air door. I tested to see if i had good power and ground coming from the head unit, it tested good at 12v. Pulled the actuator out an...
2004 Chevrolet Blazer LS 4.3L wheels VIN: 1GNCT18X24
Vibration started after replacing tires. Tires were replaced with original type, size and manufacturer. I did not notice any extreme vibration before, yet I have checked for bent parts,drive shaft, even flex plate for cracks. This vehicle came original with th...
1997 GMC Savana 1500 4.3L distributor VIN: 1GFTG15R8V
Van came in to another shop not running. Apperently was on highway and just died. Other shop first looked at distributor and thought that may be the problem. they changed distributor, this didn't fix problem so they then changed the coil. Still not working. Th...
1997 Oldsmobile Cutlass GLS 3.1L Steering VIN: 1G3NG52M1V

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick Century Custom 3.1L MIL Lamp on VIN: 2G4WS52J2Y
Thanks for all the responses. Most pointed to a possible poor ecu ground for the egr problem, and burned headlight switch terminals for the lighting problem. After some discussion it turns out the problem with the trans position illumination is due to the auto... Trouble codes: P0405.
1995 Cadillac DeVille 4.9L Interior VIN: 1G6KD52B1S
replace cluster with salvage yard part - no other problems
1999 Chevrolet Blazer 4.3L tranfer case VIN: 1GNCT18WXX
Hey thanks everybody for the help. What i found was a broken signal ground wire up side near the bell housing causing the issue.After i ran a new ground and reset the system 4wd works perfectly. The reason i began rechecking my wires Varmits lol. I found the t...
2003 Chevrolet Express 3500 6.0L Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GCHG35U23
Thanks everybody. We changed the injector pigtail for cylinder 1 injector and also cleaned the mass air flow sensor. Cleared codes and have been driving for a couple of days. So far so good. Thanks Again. Trouble codes: P0200 (Fuel Injector Control Circuit).
2003 Chevrolet Suburban 1500 LS 5.3L pushbutton switch VIN: 3GNFK16T23
After playing with this vehicle on the shop floor I was able to get the problem to act up, it was very intermittent. I was monitoring the encoder position sensor voltage and noticed that it was all over the place when the problem occured-.03 volts to 3 volts-i...
2003 Chevrolet Tracker 2.5L Starting VIN: JNNE34KN3W
frist thanks to all who replied,I was able to isolate this draw quite easily with your help.first I unplugged the radio and bam draw was gone ...the 600 ma.. was of course to clue that is the approx .amperage of a module that hasnt gone to sleep...once again t...
2005 Chevrolet Silverado 2500 HD 6.6L Radio VIN: 1GCHK23235
Hi All Sorry it took so long to close this request but I was waiting for the customer to bring back the vehicle. Many thanks to Charles, Carl [...] as they gave me the best information to fix this . The fix is to have the ignition on with the...
2001 GMC Yukon XL 1500 SLT 5.3L No Start VIN: 3GKFK16T11
Thanks again for all the helpful hints guys. Found broken wiring from the bottom of the fuse box that goes to the fuel pump circuit. The wiring may have been cut inadvertently when the dealer installed Alternative Fuel System. Just as FYI, there are few cars h...
2003 GMC Sierra 3500 6.6L Rear Brakes
First, Thanks to all that replied. As it turns out there were 2 problems. One that was driver error and one that was me not seeing the forest for the trees. Special thanks to Roger [...] for his tip regarding the brake hoses. I ended up having to insis...
1994 Oldsmobile Bravada 4.3L No Start, Stall VIN: 1GHDT13W8R
I received 5 excellant replies. Nelson [...] suggested coil and fuel pump pigtails, they check...
2000 Oldsmobile Alero GL 2.4L Remote Door Lock VIN: 1G3NL52T4Y
Thanks to all that replied especially Keith [...] who got me the full series for reprograming the remote. Although the first and second time didn't take the third one did after the battery was removed and reinstalled in a new remote. Thanks again IATN'ers. ...
2000 Pontiac Firebird Formula 5.7L No Start VIN: 2G2FV22G5Y
Hey guys, this bird finally wouldn't start, and I was ready. I had fuel gauge and spark tester hooked up, and was able to take snapshot data , which really helped. Anyway, this bird had no spark when it took a notion not to start. So I followed my lead and fou... Trouble codes: P0443.
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