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Prev Professional Automotive Repair Technical Discussions for May 17, 2008
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Open Help Requests for GM
Help Request Answers
1993 Buick Park Avenue 3.8L A/C Compressor VIN: 1G4CW53L2P
Customer brought to me from another shop stating A/C Inop.Compressor locked up. Saw wire and toggle switch , unhooked and installed new Comp.Temp. recharged system to see if any other falures.Also noticed A/C control head " Flashing".Scanned and got Code 66,Lo...
1996 Buick LeSabre Custom 3.8L Electronic VIN: 1GCW52K6TH
1996 Buick LeSabre with dual control AC system. Both AC and heat work fine with just the driver controls but the passenger controls do not change the settings on the passenger side. Both upper and lower blend doors are working via the driver control and discon...
2007 Buick LaCrosse CXS 3.6L XM module VIN: 2G4WE58787
Hello, Can anyone help me with the location for the XM module on this vehicle? The system is all original, factory installed. This Delco has the single CD but no factory CD changer, and it does have the BAND button. To add an iPod interface I need to access th...
2001 Chevrolet Blazer Xtreme 4.3L Misfire VIN: 1GNCS18W31
Vehicle misfire at idle. Off idle vehicle smooth out. Misfire is very sutle. Fuel pressure is within norm. Fuel Injecto balance test is pretty much even. Customer had replaced cap rotors ignition wire set. Spark looks fine. I can hear a slight tapping noise co... Trouble codes: P0303 (Misfire Cylinder 3)
2001 Chevrolet Impala 3.4L MIL Lamp on VIN: 2G1WF55E31
I got this car with a security light on and setting a B2960 passlock code,went thru all the diag.inspected the wire's at the BCM and checked resistance all were ok, Installed new lock cylinder and security light is still on and will start with out relearning. ... Trouble codes: B2960 (Ignition passlock module)
1997 GMC Savana 3500 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1GTHG35R4V
Sure hope someone can help, This van intermittently will miss on one or multible cylinders, backfire under load, and stall. Hot or Cold dosent seem to matter. One of the strangest things about this is the ecm will not read missfires. The scanner Data stream sh...
2001 GMC Savana 2500 5.7L Misfire VIN: 1GTGG25822
man do i need some help on this one,gmc van 5.7 motor codes po335 po341 it runs like crap just above idle it backfires if you pull number 1 plug wire it goes away,on my modis scanner it shows no missfires,plugs and wires are new have real good spark, replaced ...

Fixes & Summaries for GM
Fix/Summary Answers
1995 GMC C1500 Sierra SL 5.0L Long, Extended Crank VIN: 1GTEC14H1S
Thanks for all your replies. Most of you said Fuel Pump relay. We tried that and symptom was still there. It actually turned out to be intake valve deposits. Thanks to Ron from New Hampshire. Ran a top end cleaner and symptom is now gone. Thanks again to all w...
1999 Pontiac Grand Prix SE 3.8L Poor Idle Quality, Hesitation, Surge, Cuts out VIN: 1G2WJ5K2XF
i always suspected the mass air was bad, but the snapon vantage scope was too slow to catch the glitch when i taped on the mass, so i dug out the 1950's heathkit scope and worked like a charm, got a glitch when i taped on the mass. so thank you to all for wond...
2001 Pontiac Aztek 3.4L Cooling Systems VIN: 3G7DA03E61
Thanks for the replies, guys. Responses were unanimously in favour of the intake being responsible. You were all right! I added a dye tracer to be certain and found slight fluoresce at the back of the engine (trans. side). No wet spots to my surprise. Customer...
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