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Prev Professional Automotive Repair Technical Discussions for October 17, 2013
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Open Help Requests for GM
Help Request Answers
1991 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD53B2M
Car has only 53K miles very clean well maintain. The CO is at 0.00% running lean causing high NOX. Fuel filter is new. no leaks from pressure regulator or any air / vacuum leaks. EGR works per specs and no restriction at passages. Cat Converter is not faulty. ...
1988 Chevrolet Caprice 4.3L Ecm VIN: 1G1BL51Z3J
4.3l engine apparently is a rare bird in these things. I've got a burn computer - dead short to the case and ground blowing the inline fuel fuse. Can anyone confirm for me if a ECM out of a 5.0l or 5.7l vehicle will work by switching the chips in the ecm? I ...
1989 Chevrolet K1500 Cheyenne 4.3L mode door VIN: 1GCDK14Z5K
This pickup came in with customer saying when he switches from vent to defrost it takes along time to switch. it has a electric system with mode door actuator. Inspected and found control head sending what appeared to be good signal. He previously had the cont...
1995 Chevrolet C3500 Cheyenne 6.5L No Start, Cuts out, Stall, MIL Lamp on VIN: 1GBKC34F4S
Customer brought me this diesel truck, says every now and then will shut off on him, usually starts back up. Sometimes it will run poorly and have no power, other times wont start at all. Did have the 2 codes in it. I havent verified his concern but he says it... Trouble codes: 36 (Injection Pulse width error long responce), 35 (injection pulse width error short responce)
2001 Chevrolet Blazer LS 4.3L Lighting VIN: 1GNDT13W81
We got an odd one here folks. The headlights on this Blazer only work in reverse. No DLR. The park lights work and the warning dinger work if we leave the H.L. switch on. ~Cheers~
2002 Chevrolet Venture LS 3.4L wont start VIN: 1GNDX03E82
I got this chev venture that wont start I have a few scan tool reading that don't make sense to me maf reading with key on is 2.53 and don't move when cranking I have a 24 x crank sensor that reads 293 with the key on and when you crank don't make any differen...
2004 Chevrolet Silverado 1500 LS 5.3L MIL Lamp on VIN: 2GCEK13T74
This truck came to me October 7th of this year with a check engine light on and customer complained that he couldn't refuel the truck without the pump handle kicking off immediately. He said it took him over 10 minutes to pump 4 gallons of gas in the tank. I s... Trouble codes: P0455 (Evap leak large)
2010 Chevrolet Aveo LT 1.6L Hesitation, Stall VIN: 3G1TC6DE6A
This aveo will lose power untill it shuts off.You can be driving right along and it seams like it is runing out of fuel. If you shut car off it will work ok for a half a day or so then will do it again. No codes and all scans are normal.It would not act up tod...
2009 GMC Sierra 1500 SLE 5.3L Power door locks VIN: 2GTEK13339
Helping out a tech in the shop. Found both rear power door locks lock/unlock functions not functioning with either the switch or the key fob. Front door locks operational. Checked in the driver information center programming and was unable to change any settin...
2005 Pontiac Grand Prix GTP 3.8L Misfire, MIL Lamp on VIN: 2G2WR52445
This one is killing me. First are the known issues. The exhaust crossover is cracked, the boost control solenoid is bad. When started cold it runs fine. About a minute after entering closed loop cyls 1 and 3 begin to misfire. Engine is shaking and CKP relearn ... Trouble codes: P0300, P0243

Fixes & Summaries for GM
Fix/Summary Answers
1993 Buick Riviera Luxury 3.8L instrument cluster/hvac VIN: 1G4EZ13L0P
After extensive tests, we replaced the pcm to no avail. Back to the drawing board led us to fatal errors in the bcm, so we chose to send the bcm off for remanufacture. We will know the definate fix within a few weeks.
1999 Chevrolet Silverado 1500 5.3L Poor Idle Quality VIN: 2GCEC19T2X
Thanks to all. Even with no codes bad 02 sensor. Readings out and not noticed. Honestly wasn't looking there. Have never had one not throw codes.
2003 Chevrolet Impala 3.4L speedo VIN: 2G1WF52E23
I traced the VSS wiring harness and found that it had rubbed on the RF corner of the oil pan and was shorting to ground. Repaired the wire and speedo and shifting are ok. Here are some of the other suggestions - Clean grounds and battery cables. Check alt for ...
2003 Chevrolet Trailblazer North Face 4.2L Left Blend door VIN: 1GNET16S83
Well everyone i was misinformed a little one this one. Both the actuators that were installed were GM actuators. After doing some research on GM parts web site ive discovered that the dealer sold us the the wrong actuator not once but twice. They sold us a mod...
2009 Chevrolet Silverado 1500 LT 5.3L Surge VIN: 3GCEC23069
The customer picked up truck so we did not get to try your ideas. thanks for all the input.the truck came back today and we will get back with any new info.
1995 GMC C1500 Sierra SL 6.5L No Start, Cuts out, Stall VIN: 1GTEC14P8S
Thanks everyone. Turned out to be a faulty FSD module as Vincent and Patrick suspected. I was not able to capture FSD input and output control signals upon failure, but after eliminating 99% of the other possibilties, I took the plunge on the module. Vehicle w... Trouble codes: DTC, 35 (history code after clearing codes has not reset after multiple stall), DTC, 33 (MAP high. Has reset once since initial code clearing), DTC, 32 (EGR System problem. Code re-appeared once since clearing), DTC, 65 (Accellerator pedalposition. Historical code. Has not re-occured).
2001 GMC Savana 2500 5.0L Hesitation, Misfire, MIL Lamp on VIN: 1GTFG25M71
fuel pump was droping 9 to 10 psi under load was causeing po300 random misfire change fuel pump and filter was able to crank relearn good road test runs great we doubted the fuel pump because the presure was so close change. thanks guys for all your help...
2004 Saturn Ion-1 2.2L No Start VIN: 1G8AF52F84
Well what I did was go through the whole car unplugging and plugging in every connector that I could find. Blowing them out with shop air and spraying contact cleaner. At the end of the day I plugged everything in, hooked up the battery and Away she Went ! Not...
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