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Prev Professional Automotive Repair Technical Discussions for February 11, 2009
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Open Help Requests for GM
Help Request Answers
1995 Buick Riviera 3.8L No Start VIN: 1G4GD22165
car came in as a no-start, no comunication between scanner and pcm. there is no pulse to the injectors. checked grounds and found to be ok, except we don't see from the mitchel diagrams where the pcm is grounded. any ideas?
1999 Buick Regal GS 3.8L No Start VIN: 2G4WF5216X
Customer complains of intermittant no start. Could not duplicate problem however when left turn signal is turned on the car will shut off. With key on engine off the dash will flash on and off and you can hear fuel pump running for 2 sec prime when turn signal...
1999 Buick Park Avenue 3.8L Misfire VIN: 1G4CW52K5X
I would like to thank everyone for their help in advance. I just had this car dropped off running on one leg. The onwer had let someone try to do a tune-up and couldnt do the rear plugs and go the wires crossed up. I finished the tune-up and fixed the wires bu... Trouble codes: P0300
2000 Cadillac DeVille 4.6L Mechanical VIN: 3557879058
I am going to be replacing an engine, i have not done this model before, any suggestions please, come out underneath, come out top, any proggramming issue's or foresight that might help me out. Thanks gents.
2003 Cadillac DeVille 4.6L 2ndary air pump VIN: 1G6KD54Y73
2ndary air pump code p code 0410 replaced air pump with new style for dealer and cleared codes 60 miles later code comes back on checked operation of pump with scaner and pump comes on, please help and thanks for the help Trouble codes: 0410 (2ndary air pump)
1985 Chevrolet S10 2.8L Stall
gm carb guys please help have put kit in carb with new float no computer control on carb sharp turns it will stall if rock truck in shop it will stall add carb cleaner it will run somewhat while rocking thanks in advance for the help dont know what else to try...
1991 Chevrolet R1500 Suburban Silverado 5.7L Excessive Emissions, Hard start cold VIN: 1GNER16K3M
Car came in with a cold start hard start. Running rich. Need to open throttle manually to get to start. Once started will blow black smoke for a minute or two, then will clear up. Items that have been changed: MAP sensor, pickup coil, IAC, ignition coil, spark...
1999 Chevrolet C1500 Suburban 5.7L No Start, Stall VIN: 3GNEC16R7X
truck came in with this problem. with no codes. checked fuel pressure.55 psi. we have replaced the fuel pump and filter. still has the problem. it stalled and would not restart one time but not long enough to find the problem.
2001 Chevrolet Monte Carlo SS 3.8L cooling fans VIN: 2G1WX15K21
high speed fan on koer but not koeo data stream shows no fan cammand. a/c off,coolnt temp never above 140 verified with infared .with scan tool access high speed fan control no affect,but access low speed fan control and the fans can be controled.
2003 Chevrolet Silverado 2500 6.0L Misfire, MIL Lamp on VIN: 1GCHC24U93
thanks to all before hand. truck misfired at 25 to 30 mph mil flashes at 70 to 75 mph. stays on flashing til you get below 70 no hard code store when flashing goes away. check all ecm grounds. now dont know where to go from here. need help Trouble codes: P0300
2006 Chevrolet Cobalt LS 2.2L instrument panel lights VIN: 1G1HK55F66
Hey need some help with this one, We have this Chevy Cobalt that came into the shop. The problem the customer is having is when you turn on the park lights all the exterior lights and illumination lights for the guages comes on, But as soon as you go to turn t...
1994 GMC Jimmy SLE 4.3L 2-3 shift VIN: 1GKDT13W0R
hi we have a 94 gmc jimmy here the trany dose not have a 3rd gear. when driveing the truck it will just tach out when it should go into 3rd. it will go in to 3rd if you manualy shift it. the trany pan was leaking and it was 3 quarts low before this happend. sh...
2006 GMC Envoy SLE 4.2L Spark plugs VIN: 534811GKDT
Nothing wrong here,I just need to know if there's anything special or unusual to do when changing plugs on this engine(COP,aluminum head etc.).Thx in advance TISH
1999 Oldsmobile Alero GL 2.4L No Start VIN: 1G3NL52T8X
Hello techs. I hope someone can help me. I have this olds alero with the 2.4 engine that has an intermittent no start. The only codes was a p0507 that has not returned since being cleared. When the problem happens there is no injector pulse & i think it's miss... Trouble codes: P0507
2000 Pontiac Montana 3.4L starting curcuit inop VIN: 1GMDX03E04
this is a intermitant problbem . when it is at the shop it does not occur . the customers complant is that the vehicle will not turn over . the dash lights come on but it does not turning over & there is no sound at all. a boost does not help but after a sh...
2000 Saturn LS2 3.0L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G8JW52R7Y
This vehicle is not hitting on cylinders # 2, 4, 6, We did remove the front half of the plenum and checked for fire at the plugs and there is good fire. We removed the front plugs and cleaned them . We cleaned the intake and throttle plate. When we unplug the ... Trouble codes: P0447, P0300, P0302, P0304, P0306, P0506

Fixes & Summaries for GM
Fix/Summary Answers
1991 Buick LeSabre 3.8L Hesitation, Surge, MIL Lamp on, code 41 VIN: 1G4HP54CMH
Well,my suspicions were confirmed. The magnet was defective.But here is the deal that maybe you tech's smarter than me can explain. When I test both magnets, both attract and both have the same pull to them.However,the defecive one will not produce a signal ou... Trouble codes: 41 (cam signal circut problem).
1998 Cadillac DeVille 4.6L abs VIN: 1G6KKD54Y4
Thanks guys yes it was a ground. also didnt have ABS plug seat ed in the module. Lights are out.
1995 Chevrolet Blazer 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire VIN: 1GNDT13W4S
as many have you said the fuel pressure regulator and the cpi lines were leaking..you couldnt see the leak with the intake removed but removing the sensor from the top of the intake and watching it while it cranked you could see gas shooting out the end of the...
1998 Chevrolet Tahoe LS 5.7L transfer case VIN: 1GNEK13R2W
FIXED! And you'll never believe what I found. First off I believe the initial problems my customer had with this NV-246 were due to the slowly corroding wire to the motor brake circuit which would sometimes/sometimes not cause the "service 4x4" light to come o...
2002 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, MIL Lamp on VIN: 2MECM75WIN
the right side mount was causing the vibration this mount is next to the exsaust manifold and was slightly swollen on one side.we replaced the cam phase solenoid for the second time but only time will tell,thanks for all the help Trouble codes: P0014.
2004 Chevrolet Silverado 3500 LS 6.6L MIL Lamp on VIN: 1GBJC34254
Thanks for all the good replies and after going thru all your suggestions Brent from British Colombia hit it on the nose.After clearing codes and going on a bunch of long road tests the only code that came back was the p2227 baro performance.At that point I ch... Trouble codes: U0106 (Loss of communication with glow plug module), P2068 (Fuel gauge low), P2227, P2228 (Barometric pressure sensor voltage low).
2001 GMC Yukon XL 2500 SLE 6.0L Misfire, MIL Lamp on VIN: 3GKGK26U81
Hi every body, sorry for not responding, but we where kind of busy, any way, the solution to my misfiring es just perform crank relearn, just as many of you suggested, after crank relearn, we where able to do smog inspection,no more codes setting . Thanks to a... Trouble codes: P0300.
1991 Oldsmobile Cutlass Supreme 3.1L Poor Idle Quality, Hesitation, Cuts out VIN: 1G3WH54T9M
Well this ones a fix. I took every ones advice and checked it all out. I changed the temp sensor that Theodore suggested and this brought the temp to where it should be. The ones that narrowed it down were Stan , Matthew & Timothy who suggested checking the in...
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