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Prev Professional Automotive Repair Technical Discussions for July 5, 2010
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Open Help Requests for GM
Help Request Answers
1983 Buick Regal 3.8L Stall
im gonna need a real pro on this one--one that knows the Rochester feedback 2 barrel carb and its tuning. the problem is a flat spot off idle--transition fuel. when starting from a stop, the engine coughs lean and dies. Feels exactly like a bad accelerator pum...
1985 Buick Regal Grand National 3.8L Hesitation, Misfire VIN: 1G4GK4791F
Have misfire when accelerating. also will be intermittent. did find that the number 6 plug and wire had carbon tracking. replaced all plugs and wires. still have a misfire on load not as bad as before but still present and very noticable. fuel pressure good at...
1996 Chevrolet C3500 Silverado 6.5L Starting VIN: 1GBKC34F7T
Hi guys, this truck is our ramp truck we bought it this past spring. It has 240k miles on truck but motor has been replaced at some point ,not sure of mileage on motor maybe 50-60k miles? Just a guess. Anyways when the truck is hot and you shut it off it will ...
1998 Chevrolet Express 2500 4.3L Poor Idle Quality, Hesitation, MIL Lamp on VIN: 1GCFG25W51
Some cold starts this thing cant stay running, it back fires on accel, no misfire codes. It cuts out and runs poor until it goes into closed loop. Then it runs fine. Codes came on during closed loop= P0171 & P0174. Engine up to temp and driving around 25mph. R... Trouble codes: P0171, P0174
2003 Chevrolet Suburban 1500 LS 5.3L Valve Train VIN: 1GNEC16Z83
I have a noise in the valve train. A tapping that increases in volume from being barely discernable at idle to a sharp staccato sound above 2k rpm. Cancelling cylinders via injectors makes no change whatsoever. We removed the driver valve cover and ran the en...
2005 Chevrolet Tahoe LT 5.3L Ebcm VIN: 1GNEC13T85
Replaced ebcm, now i see it sets c0040, key on engine off, which it probably was to begin with. Thought i followed flow chart, verbatim. Oviously not. I have not reflashed or driven over the 8 mph yet. Any ideas? did i miss something in the text about error wi...
2005 Chevrolet Venture LS 3.4L No Start, Cuts out, Stall VIN: 1GNDV03E55
hey folks!this car come on the hook with no start problem.first of all i had to charge the batterr and install a new starter after the customer kept cranking.still no start till check for codes and p0386 show up,installed new crank sensor B and no luck,then wi... Trouble codes: P0336, P0386, U1000
2006 Chevrolet Silverado 3500 LT 6.6L MIL Lamp on, Goes into limp in VIN: 1GCJK33D96
The customer was driving and experienced a loss of power. He stopped and changed the fuel filter and continued driving for maybe 50 miles when he experienced the same problem. Thinking he may have had bad fuel he replaced the filter again (WITH NAPA GOLD FILTE... Trouble codes: P0087 (Fuel Rail Pressure Low)
2006 Chevrolet Cobalt LS 2.2L left front door latch VIN: 1G1AL55F66
HELP! Left front door will not open. Handles and linkages intact. Lock actuators (inside, outside and power) and linkages intact and "working". Feels just like the right side which works. Can see all linkages and latch parts that are moved by the linkages (inc...
2007 Chevrolet Equinox LS 3.4L Air Bag system VIN: 2CNDL63FO7
I had A customer come in with a Air bag light on. He said a dealer had diagnos it saying it needed a passenger presence module or a diagnostic module or both. We tryed the presence first then the diagnostic module no fix. The only code it had to begin with was...
2004 GMC Sierra 3500 6.0L No Start VIN: 1GDJC39U54
We have a strange on here. Customer claimed truck strated for a few seconds then died and has not started since. We have fuel pressure,inj. pulse but no spark. Coils have 12V. and ground and ohmed out the control and ref. wires from PCM and coil harness. All f...
2007 GMC Sierra 2500 HD Classic SLT 6.6L Safety VIN: 1GTHK23647
Iinstalled new rims on this truck ..put in new tire pressure monitors right from gm ... Went through the reset procedure as in the manual staring at left front and ending up at left rear ..upon completion of the left rear it is supposed to single beep than dou...
2002 Oldsmobile Alero GX 2.2L OBD II monitors VIN: 1G3NK52F2C
OBD II readiness monitors for O2 & CAT will not set. It will set all other monitors evap, o2 heater ect. no problem time after time. I have followed a drive trace to the letter multiple times for these monitors. No MIL, or pending MIL codes. Do I need to run t...
2000 Pontiac Grand Prix SE 3.8L key wont return VIN: 1G2WJ52K2Y
top of the day fellow techs.I hope it's been a great 4th of july for everybody.this 2000 grand prix has been a pain in my side.the problem is the ignition key won't return to the off position after driving.I've driven the car and come to a stop, put it in park...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick LeSabre Custom 3.8L Vent Temp VIN: 1G4HP54K4Y
Thanks to all who replied. Ended up removing the blower motor and cleaning the evap. core. System was still not very efficient while idling in the shop, but, blew in the 40's on medium blower speed going down the road. in the 50's on high speed blower. Not sur...
1996 Cadillac DeVille Concours 4.6L high pressure VIN: 1G6KF5295T
Thank you to all who replied...faulty equipment coupled with a bad low pressure sensor were the issues!
1995 Chevrolet C1500 Silverado 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GCEK14K6S
Sorry For The Wait And Thanks Again To Everyony For All The Great Help. The Problem Was The New O2 That I Had Put In. I Guess You Can't Always Trust A New Part. Many Thanks
2004 Chevrolet Silverado 3500 6.6L Unknown VIN: 1GCJC33264
Thanks everyone for all the help!I should have mentioned that this is a 2 wheel drive.Tyson from Utah hit right on!The middle u-joint was locked up.I have never had a u-joint that gave these symptoms.I used just the parking brake and shudder was still present ...
1997 Pontiac Grand Am SE 2.4L Clatter in Engine VIN: 1G2NE52T6V
I want to thank all who tried to help on this tough situation but we did not ever get the car fixed because of how labor intensive it is to dig into the lower engine. We told the customer to drive it like it is until something worse happens and then put anothe...
2003 Pontiac Aztek 3.4L Stall VIN: 3UEIRJ38K3
custumer had hot wired ac compressor causing a non stable idle upon start up Trouble codes: P0300.
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