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Prev Professional Automotive Repair Technical Discussions for March 4, 2011
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Open Help Requests for GM
Help Request Answers
1993 Buick Regal 3.8L Poor Idle Quality, Hesitation, Misfire VIN: 2G4WB54L0P
Ok here is the issue. The car came to us with a missfire the plugs and wires and a coil where changed at the time it left running good 2 days later it comes back with a missfire on cylinder #4 good spark the injector is working i have signal to the pigtail. We...
1995 Chevrolet K1500 Suburban 5.7L torque converter VIN: 1GNFK16K0S
Vehicle came in shifting fine. Customer stated that while driving on interstate the tcc wasn't locking up and engine rpm was higher than normal. After shifting the vehicle into neutral and then back into the overdrive it then went into lockup mode. He also sta...
2002 Chevrolet Tracker LT 2.5L Engine VIN: 2CNBJ34626
Thank you in advance for your time/experience. What we have is a tracker with the 2.5 v-6 suzuki engine. It has a wining noise that sounds like a howling alternator. We have removed belts and noise is still present. It does not sound like it is coming from the...
2006 Chevrolet Express 3500 6.0L Misfire VIN: 1GCHG39U06
Have misfires on 2,4,6,8 only. Number 6 is the worse. Trouble codes: P0300
2007 Chevrolet Uplander LS 3.9L Starting VIN: 1GNDV23W27
When you turn the key to start the vehicle, the horn honks twice and vehicle doesn't attempt to start at all. My question is, is this something I will be able to fix or should this go to dealer. We don't have any programming tools here at our shop and this is ...
2002 Pontiac Aztek 3.4L Starting VIN: 3G7DA03E42
Hello again! Another headache here. 2002 Aztek 3.4. customer complains that 1-2 times a day vehicle will crank ok but really struggle to start, if it starts at all. He tells me the problem use to happen every once in a while, but it's gotten progressivley wors...
2003 Pontiac Vibe 1.8L Misfire, MIL Lamp on VIN: 5Y25M628X3
has anyone run into a problem that will cause multiple coil and or plug failures ?? powers and grounds are good . is there a TSB that i can't find ?? Misfire seems to move from cyl to cyl.Possible injector or regulator issue ?? Any help would be appreciated ! Trouble codes: P0303, P0304, P0302, P0420 (cat eff. b1 below threshold both times in)
1997 Saturn SL2 1.9L Misfire, Poor Fuel Economy VIN: 1G8ZK5277V
Four months ago we replaced cat converter, o2s sensor2, exh pipe and muffler because of leaking ex system. Now the customer states that exactlly after we did the exhaust work, the fuel milage dropped from 30mpg to 15mpg!!! so now i'm trying to determine what c...

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick LeSabre Custom 3.8L Misfire, MIL Lamp on VIN: 1G4HP52K4V
thanks for all replys, found key between cam gear & camshft broken, dont know why, yet, but will get to bottom of it, thanks again for all your replys Trouble codes: P0300.
2005 Cadillac STS 3.6L timing chains VIN: 1G6DW67785
Hi Gang Car is out of shop and running and no timing chain rattle. I followed mark from Pennsylvania's instructions and she worked. The info from shop key was very vague I wound up getting two supplements from GM which did help. As usual you guys are...
1992 Chevrolet K3500 Silverado 7.4L Poor Idle Quality, Surge, Cuts out
First of all "THANKS" to all 37 replies. I thought I knew these TBI engines but I know a LOT more now!. Problem was probably mostly my fault. Customer told me it was a '92 and the door said '92. After changing fuel pump 3 times I put the old one back in to ver...
1998 Chevrolet Tracker 1.6L Misfire VIN: 3CNBJ1868W
i'm going to close this even thou ots not done yet. i'm pretty sure i found the problem. I.ve always been hearing a noise from the engine that bother me, but i coudn't figure out what was causing it. also this car had a intermited loss of power, not alot but s... Trouble codes: P0304.
2002 Chevrolet Impala 3.4L MIL Lamp on VIN: 2G1WF52EX2
First thanks to the replys I checked all wireing pulled computer and that is where the mouse nest was red wire for egr had 3 inch piece gone found 2 other wires also chewed up. Soldered in new wires and egr was fine.But some bone head put after market security... Trouble codes: P0403 (EGR Control circuit).
2004 Chevrolet Avalanche 1500 Z71 5.3L dash lights VIN: 3GNEK12TX4
I have not been able to get the vehicle back to the shop. The owner went away on holidays out of the country. Thanks for all the replies. He does not have an aftermarket radio installed but I think I may consider looking for bad/pinched wiring.
2008 Chevrolet Silverado 1500 LT 5.3L MIL Lamp on VIN: IGCEC19088
After discovering that I only had 9 volts on the supply Voltage circuit (pink and black) I found a green corroded spot in that wire, right where the harness comes down the back of the transmission and loops over to the frame. Looks like this might be a common ... Trouble codes: P0036 (O2 heater circuit bank 1 sensor 2), P0054 (O2 heater resistance bank 1 sensor 2), P0138 (p0141-), P0141 (p0300-), P0300 (p2270-), P2270.
1995 GMC C1500 Suburban 5.7L No Start VIN: 1GKFK16K6S
thanks to all whom replyed root cause of condition was connector at moduel to coil (black conn) terminal fretting replaced connector and problem of no spark was repaired
2006 GMC Envoy XL Denali 5.3L MIL Lamp on, Mis-fire VIN: 1GKET16S26
here is the status: After performing the fuel injector test properly, it was determined that #4 & #6 were not operating efficiently. They were mis-firing. Before replacement I decided to try cleaning. I took two steps; first was to introduce Lucas Fuel Injecto... Trouble codes: P0300 (Cylinder misfire), P0171 (P0463- sending unit ckt A high input.), P0463 (sending unit ckt A high input.).
2000 Oldsmobile Intrigue GLS 3.5L Engine VIN: 1G3WX52H9Y
It was the spacer behind the idler pulley. It would load up on the bolt while spinning and then 'pop' as it released the tension on the threads of the bolt. I drilled the spacer out very slightly and it took care of it. BTW the new pulleys rub on the spacer. H...
2004 Pontiac Grand Prix GTP 3.8L Cuts out, MIL Lamp on VIN: 2G2WR52474
This vehicle is down the road.It ended up being the PCM.It was a very odd one.Every time I would clear codes and then recheck it would generate different code/codes.I had convinced myself it had to be gnd or pwr problem.After checking everything multiple times... Trouble codes: P0651, P0742.
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