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Prev Professional Automotive Repair Technical Discussions for October 1, 2007
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Open Help Requests for GM
Help Request Answers
1991 Buick Skylark 2.5L Cuts out, Misfire, BACKFIRE VIN: 1G4NV14U2M
the customer brought the car to us with the complaint that the engine will cut off when taking off from a stop at times. when i test drove the car i found that it misfired badly and would backfire through the intake. i am leaning toward the map sensor or ig mo...
2000 Buick LeSabre Limited 3.8L speakers VIN: 1G4HR54K0Y
Customer brought car in about a month ago and said since weather has gotten a little cooler his speakers do not put out any music in the morning. After driving about 45 minutes or so then music will start to play. When it starts to play it starts out real soft...
1976 Chevrolet Camaro 5.7L Cooling Systems VIN: IQ87L6N512
I have a vehicle here that is leaking at heater core. Unfortunatly we have never replace one of these before. Our mitchell 1 does not go back that for for removal and installation procedure. Anyone out there replace a heater core on one of these vehicle and/or...
1998 Chevrolet Camaro Z28 5.7L Stall VIN: 2G1FP32G8W
I need help. A 1998 Chevy Camaro with a 5.7L and manual Trans came into our shop with the compliant: "Car Stalls sometimes, it doesn't matter if moving or at idle." After checking car 99 times I got it to happen 3 times, I notice that the SECURITY light comes ...
1998 Chevrolet Tracker 1.6L Misfire VIN: 2CNBJ1368W
fellow techs. got a real teaser,initially I had a problem with number 3 cyl. spark was good right to the cyl. I tested the spark plug,OK. tested the firing of the injector,OK. flow tested the injector,OK. I performed a injector flush, the engine ran worse. I r... Trouble codes: P0300
2003 Chevrolet Silverado 1500 4.8L Int, Steeing Shaft VIN: 1GCEK14VX3
To All, This is my own truck. I replaced the intermediate steering shaft with a Borgeson-Mullins unit as I was getting sick of the clunk and the "re grease" bit. No more noise etc. but it seems I have more engine vibrations in the steering wheel.Anyone have a...
2005 Chevrolet Silverado 1500 4.8L Starting VIN: 1GCEK14V55
Hello, I have this truck that was towed in with a no start, (no crank) just happened out Of nowhere.I have This code(U1041) but no info from alldata.My scanner says it is cranking but it is not cranking.Could somebody help me with this situation?I looked int...
2005 Chevrolet Suburban 1500 LS 5.3L abs VIN: 1GNFK16Z85
A friend stopped by tonight. He has had his truck back to dealer 3 times for this problem that does not leave a code. He is still under warranty but I think dealer is lost. I left my shop under medium acceleration and just before it shifted the traction contro...
1992 GMC Sonoma SLE 4.3L No Start, Cuts out VIN: 1GTCS14W4N
Hello all! Thanks in advance for taking the time to look into this. This GMC came in on the hook with a blown ECM 1 fuse. Replaced fuse and truck came to life. Checked circuit, found it powered ECM in two locations, intake manifold tuning relay, EGR, and fuel ...
1998 GMC K1500 Sierra SL 5.7L security light VIN: 1GTEK19R1W
this unit has a new steering column installed the truck was stolen and nnow we can not get the key/security to properly program what is the correct steps to do this the alldata steps do not work thanks guys
1992 Oldsmobile 88 Royale 3.8L Unknown VIN: 1G3HN53L7N
Hello All I feel silly even posting a help request for what should be a simple problem to find. This car is driving me nuts. I have a vibration in the front end between 65-75 MPH. It is quite violent and is not felt in the steering wheel but is felt in the fr...
1993 Oldsmobile 88 Royale 3.8L No Start VIN: 1G3HN53L9P
Hey guys, have this no start in the shop and have no ign, fuel pump , nor inj pulse. usually a simple module or crank sensor prob,right? i keep a known good mod and sensor for these as they fail often, but in this case switching to test was no help. i have al...
1989 Pontiac Firebird 5.0L No Start VIN: 1G2FS21E0K
hey guys help a nissan tech out 89 firbird no start sometimes finaly caught it? no fuel injector pulse ign1 fuse good what i need to know what triggers the driver for the pcm? is it the module? thats where im headed please help
1996 Pontiac Grand Am SE 2.4L Misfire VIN: 1G2NE52T7T
My smog tech is not in today and im stomped on my next move for trying to figure this car out. has 175psi compression 2.4mV at injector at idle and number four cylinder still misses can anybody help thanks Trouble codes: P0301, P0141
1999 Pontiac Sunfire SE 2.2L head VIN: 1G2JB1245X
Have carefully inspected lower end. Engine didn't get extremely overheated prior to repair. block deck straight. these heads look like aluminum styrofoam-are they prone to mysterious leaks?
2000 Pontiac Grand Prix SE 3.8L Poor Idle Quality, MIL Lamp on VIN: 1G2WK52J71
having computer prooblems,need to remove old one to get numbers off of it so i can get new one fashed. can someone tell me where the pcm is located on this model
2002 Pontiac Grand Prix SE 3.8L antitheft VIN: 1G2WR5132F
Hello fellow techs , I have a 2000 Gran Prix that was towed in for no start . Customer claims security light has being flashing for months with no other problem. Code P1629 was hard , would not clear , theft deterrent parameter disabled. Wiring checked out ok ...
1996 Saturn SL2 1.9L Misfire, tach cuts out VIN: 1G8ZJ5276T
After start up, the vehicle will run poor for 2-5 seconds. While this is happening, the fuel pump relay will click constantly, and the tach will drop out at the same frequency as the relay. Then the idle goes high (2000-2500 rpm) for 3-5 seconds. After all thi... Trouble codes: P0336
2000 Saturn LS2 3.0L Hesitation VIN: 1G8JW52R8Y
Hi, This Saturn has something unusual going on. The Genisys shows the following readings and yet the engine runs well except for an occasional hesitation. Some of the DTC's seen on the Genisys cannot be found in Mitchell. All readings below were taken from the... Trouble codes: P0401 (EGR Flow Insufficient), P1118 (Not known), P1829 (Not known), P2914 (Not known), P1530 (Throttle control system amplifier adjustment)
2003 Saturn Vue 2.2L transmission VIN: 5GZCZ43D53
Hello techs, I need some help. This Saturn has a cvt transmission. When it came in it had a rich fuel trim code 172 set and had pid reading that did not make since like 10 volts on batt pid, 6,000 mv on o2 sensors and fluctuated to 30 mv. map read 0 v. Car had...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Regal LS 3.8L lf window VIN: 2G4WB55KX1
well i put in a gm motor and we will see if it lasts. thanks for the responses but i didnt really get the answer i was looking for,that was how long does the motor have to stall before the express down clicks off. thanks again.
1992 Chevrolet G20 Beauville 5.7L Hesitation, Surge VIN: 1GCEG25K2N
this vehicle had several problems, # 1, the fuel tank ballast was broken inside the tank and was moving around causing the fuel pump and sender to be damaged. so I replaced the pump/sender and fuel tank. This helped the problem but was still lean. I then repla...
1997 Chevrolet Camaro 3.8L no crank VIN: 2G1FP32K9V
This model does not have a seperate Anti theft module, its all controlled by the BCM and PCM. Diag had me using a test light to check powers and grounds which did not work!! I went back and tested all powers and grounds from ignition switch with a huge head ...
1998 Chevrolet C1500 Cheyenne 5.7L MIL Lamp on VIN: 2GCEC19R7W
sorry it took so long to get back to you guys on this one. but I the got truck back into the shop, put it back on the scanner and the cam/retard was at zero. all else looked fine. pulled all conn and harnesses loose and found moisture in the cam sensor, so I ... Trouble codes: P1345.
1999 Chevrolet Blazer 4.3L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GNDT13WXX
2001 Chevrolet Impala LS 3.8L MIL Lamp on VIN: 2G1WH55K91
Thanks to all who replied. The fix was the reprogram of the PCM for the false PO420 code. The light is out and the customer is happy. Trouble codes: P0420.
2002 Chevrolet Express 1500 4.3L distributor VIN: 1GCFG15W22
Thanks to everyone that replied. after doing some further investagation we found that the balancer shaft had teeth broken also so we put another dist gear on and told the customer if it happend again they would need an engine
2004 Chevrolet Silverado 3500 LS 6.6L gauges VIN: 1GBJC34184
Thanks to all who responded. We believe that the IPC is the culprit, but the customer does not want to spend the money at this time. From the responses...the PCM monitors the level sensors in both the front (primary)tank and the rear tank. The PCM communicate... Trouble codes: U1000 (no communication).
2004 Chevrolet Tahoe LS 5.3L Air Conditioning
Thanks for all the help Techs. You guys will not believe this. After doing everything you guys said. It turns out the parts department gave me the wrong part. In my post I mentioned that the Tech II gave a code for bad actuator. so I changed it with no res...
1996 GMC K1500 Sierra SL 5.7L Hesitation, Surge, Cuts out VIN: 1GTEK19R7T
some one had upper intake off of unit a week prior and the oval shaped o ring found around the injector harness connector was torn and 1.2 missing causing a vacuum leak that could not be detected using propane or anything we j...
2003 GMC Sierra 1500 SLE 5.3L Air flow and temperature VIN: 1GTEK14T13
I did get the customer to bring the vehicle back in after he had stated it seemed to be acting the same as before we replaced the ac control head. I performed the relearn procedure again by disconnecting the battery, turning the controls to off and then conne...
1994 Oldsmobile 88 Royale 3.8L Stall VIN: 1G3HN52L4R
Thanks for all the replies. A new ecm fixed this. I had many good replies. As I stated in the diagnosis I had good fuel pressure, and a good crank signal, to the ecm. The code 1629 for the theft set, but I confirmed that this was not the issue. Now, by th...
1996 Pontiac Bonneville SE 3.8L No Start VIN: 1G2HX52K6T
Thanks to every one who resonded to my help request, But the customer hasn't brought the car back in yet because it has been working ok. He will let me know if it acts up again and then I'll have another go at it, and let everyone know later thanks Rob R
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