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Prev Professional Automotive Repair Technical Discussions for May 12, 2008
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Open Help Requests for GM
Help Request Answers
1991 Buick Park Avenue Ultra 3.8L Stall, start and stall VIN: 1G4CU53L0M
Well fellow techs,this is something I cant seem to locate. This customer brought it to us to avoid the shot gun repair her previous shop had started on.The vehicle will start and run 2 to 3 seconds and then stall.The fuel pressure stays solid throughout the ev...
1994 Buick Regal 3.1L theft
I'm working a 1994 buick regal. no start. Need to locate the theft deterent module. I believe it is at fault. Need to test the ground and 2 power to it but cann't find it and what does it look like?. looked every where. Have a 1993 and 1995 service manual but ...
1999 Buick Regal LS 3.8L steering box VIN: 2G4WB52KXX
Car came in for a noise when turning RIGHT on accel, or say 5-10 mph. Sounds like a chirp type noise(like a belt tensioner chirp), but is louder & is coming from on the right side lower area(we sat under the hood to verify). We did remove the belt & no diff. H...
1992 Cadillac DeVille 4.9L engine VIN: 1G6CD53B1N
The customer brought this car to us complaining of hot soak no start. We verified the vehicle started and ran when cold and checked his charging system. The battery had a weak cell that would show up under load testing and got worse when vehicle got hotter. We...
1996 Cadillac Seville SLS 4.6L overheating VIN: 1G6KS52Y4T
hi guys, have a nightmare here. we performed an oil change on the vehicle. customer left and called less then 15 minutes later to say the vehicle was overheating and there was a major coolant leak. we towed vehicle in and found no flow thru the system. we repl...
1993 Chevrolet Camaro 5.7L No Start VIN: 2G1FP6P6P2
Hello gentlemen,this vehicle came to me via another garage they have replaced the ign. coil & module.I have scanned it and no codes present I also bypassed the ign. key chip and checked the harness all OK.The engine cranks over fine and the fuel pump primes up...
1993 Chevrolet Pickup C2500 7.4L Mechanical
There is a moaning through the entire vehicle, when the ac clutch is on.this was there with the old compressor also.customer says it was there for a long time and was convinced the compressor was going . It was brought in for a re-charge after all parts were c...
2000 Chevrolet Impala 3.4L No Start, no crank VIN: 2G1WF22E04
won't crank, check engine light flickers once but doesn't come on, no communication, rest of ipc lights flash and go out when ignition is put to start position, once key is turned on parking lights stay on and only go off if battery is disconnected, I suspect ...
2001 Chevrolet Express 2500 5.0L Hesitation, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1GCFG25M21
help! we had the trans. rebuilt about 1 week before this problem started. the van is loaded heavy but since the c.e.l came on it has lost power and fuel mileage. we have checked for vacum leaks and any unmetered air entering the engine. we also replaced the f... Trouble codes: P0101
2003 Chevrolet Blazer LS 4.3L Misfire, MIL Lamp on VIN: 1GNDT13X23
HEADACHE!!. owner of vehicle is a friend of shop. came in, service engine soon light on. scanned- po300. cyl. #4 misfire. decided he wanted to tune it up himself. replaced fuel filter, cap, rotor, plugs and wires(with quality products). came back, same problem... Trouble codes: P0300
2004 Chevrolet Impala 3.4L unknown VIN: 2G1WF52E84
There is a buzzing/whining noise coming from the left firewall area in park/neutral only. We can only hear the noise when sitting inside the car, windows up, radio off. Under these conditions the noise is fairly loud. When you put the trans in gear the noise g...
2007 Chevrolet Tahoe LTZ 5.3L pinging, spark knock VIN: 1GNFK13037
Need some help from the G.M. dealer techs. This 2007 Tahoe pings (spark knock) badly on 87 octane fuel. 87 octane is the recommended fuel for this engine. Pinging (spark knock) worse when in 4 cylinder mode, but still noticable in 8 cylinder mode. Pinging goes...
2003 GMC Sierra 1500 4.8L Starts then Dies VIN: 1GTEC14V13
This is our parts truck and I am a Volkswagen tech not real familiar with GM, came in for tune-up. Replaced plugs, wires and fuel filter. Started and ran fine. When went out to drive it was very sluggish and misfired on load. Ceck engine light came on and had ... Trouble codes: P514
2004 GMC Envoy SLE 4.2L Misfire, MIL Lamp on VIN: 1GKDT13S14
Vehicle was driven in, cutting off ses light was on and flashing also reduced power light was on. Check dtc found po302 cyl 2 misfire, R&R coil and plug, spark plug was soaked with fuel, used a spark tester on coil no spark. Removed cylinder 3 coil and tested ... Trouble codes: P0302
1989 Pontiac Firebird 5.0L Poor Idle Quality, Surge, Stall VIN: 1G2FS21E6J
Hello this car has a problem stalling out after starting,it exhibits a lean condition untill it enters closed loop. the engine starts runs above 1,000 rpm for a few seconds then decline steadily for a few more seconds untill it stalls the fuel pressure remains...
1997 Pontiac Grand Am SE 3.1L No Start, Stall VIN: 1G2NF52M9V
This thing is driving me nuts, it will start and die as soon as the pcm shuts off fuel because it doesn't get the proper signal from the dash. I understand the pass lock ign. sends the signal through the ipc. The problem is the security light doesn't flash or ... Trouble codes: 1229

Fixes & Summaries for GM
Fix/Summary Answers
1987 Buick Electra Limited 3.8L Extended crank time VIN: 1G4CX5130H
As I suspected and most of you too that the fuel pump was the culprit here. The fuel pressure was building too slow after it set for a long time. Other replies ranged from tps sensor to cam sensor to crank sensor, but the majority of you said it was the fuel...
2003 Buick Rendezvous CXL 3.4L abs sensors? VIN: 3G5DB03E62
monday may 12th. buick back in shop today.the biggest help was to use a graph on my scanner. found LF speed sensor drop off to zero at one point. it now set a coo35 code which i didnt show before. i did check sensor with a ohm meter,found a good reading at tha...
1990 Cadillac DeVille 4.5L Cuts out, BACKFIRE VIN: 1G6CD533XL
1998 Chevrolet Tahoe LS 5.7L Surge, lack of power VIN: 1GNEK13R2W
this was a fuel pump problem replaced the pump and it was find thanks, for all of your help.
2000 Chevrolet S10 4.3L belt noise VIN: 1GCCT19W8Y
thanks for all the replys, most of them said to check powersteering alignment,but when i posted my question i said all the pullys were good and in alignment, so what i did was put a half inch shorter belt on it,and hopefully that will cure it,because nothing e...
2000 Chevrolet Silverado 1500 5.3L Poor Fuel Economy VIN: 1GCEK19TOY
The Fuel Mileage Has Increased Aprox 1.5 MPG We HAve In Installed a Throttle Body Spacer Kit and Reflashed The PCM again I Feel The Mileage is Fair For This Vehicle I Have Told Him To Try Midgrade Fuel To See If It Goes Up Thanks For All The Great Tips But I F...
2002 Chevrolet Impala 3.4L radio lighting VIN: 2G1WF52EX2
The customer didnt request any further testing at this time. We strongly feel after testing that the light problem was an internal problem. Thank you for all the help we received.
2003 Chevrolet Express 3500 6.0L Misfire, MIL Lamp on VIN: 1GCHG35U43
Thanks to all that responded but there is an old WHO song called "I can't Explain" but on this truck I noticed the even [...] trimwould go to -5% and the miss would come in on #6 cyl so I switched o2 sensors and started the vehicle and the fuel trim for 13... Trouble codes: P0300.
2004 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCHK29224
Told customer to drive the truck a little harder to get turbo to work and that seems to have kept the light off. Also found out that truck is still under warranty so any more probs and it will go to dealer. Trouble codes: P0045, P0299 (T/C underboost).
2005 Chevrolet Silverado 1500 4.8L compressor clutch VIN: 33667HHTTF
hi all,after getting the wiring diagrams and pinout for the pcm i found the 5 volt reference wire broken about 1 foot from the high pressure sensor. it looked as if it had been burned ie the copper wire was brown and had to be cleaned before it would take sold...
2001 Oldsmobile Silhouette Premiere 3.4L No Start, Cuts out, Stall VIN: 1GHDX13E41
thanks to all that replied. i had a bad connection in the under hoood fuse box, cleaned the connectors and all is fine.
1997 Pontiac Sunfire GT 2.4L No Start VIN: 1G2JD12T7V
Hi I checked the feeds and grounds coming into the PCM. It turned out to be an open circuit on PCM C1 pin 18 on the pink wire which goes to the under dash fuse box to the ECM injector 10 amp fuse. I ran a new wire from the fuse box to the PCM as requested by ...
2000 Saturn LS2 3.0L Radio VIN: 1G8JW52R7Y
This is fixed and the customer is very happy. The ground "splice pack" located in the rear corner of the engine compartment is the ground bus for several circuits, one of them the radio. I had cleaned it because of the BCM issue, but did not take the connector...
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