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Prev Professional Automotive Repair Technical Discussions for June 25, 2009
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Open Help Requests for GM
Help Request Answers
2002 Buick Rendezvous CX 3.4L no start VIN: 3G5DB03EX2
car came in because it was dying after driving. could not get car to die at first. drove car 12 miles, turned off the car for about 5 mins and then started car. when put into reverse the car shut off and would not start back up. changed fuel pump relay, checke... Trouble codes: U1064
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1997 Cadillac DeVille 4.6L Ventilation VIN: 1GKD54Y2VU
Customer complaint is simple...driving down the road with A/C on the air flow goes from face to defrost very quickly. He stops and cycles the key and sometimes this works and sometimes it does not. There are NO CODES and the self test passes. I drove it and t...
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1992 Chevrolet K3500 Cheyenne 6.5L lack of power VIN: 2GTHK39N2N
This Truck runs great for the first 15-20 minutes then will cruise fine. When you accelerate hard it loses power. if you shut it off and restart it is ok for a bit then the symptom returns.I am not really a diesel guy so any help would be appreciated
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1993 Chevrolet K2500 Suburban Silverado 5.7L Mechanical VIN: 1GNGK26K2P
Hello fellow tech's. I just purchasedthis vehicle for my shop truck and it had a bad transmission so I couldn't drive it prior to purchase. It ran great and only had a slight rough idle. Now that I have the rebuilt transmission in it and it is working correctl...
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1994 Chevrolet C2500 5.7L Poor Idle Quality, MIL Lamp on VIN: 1GCEC29KXR
Has anyone seen this EGR system will not work has a acdelco egr valve working fine egr regulator working fine, but only in diagnostic mode. can anyone please help thanks in advance Trouble codes: 32 (EGR Circuit error)
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1995 Chevrolet Camaro 3.4L dead injector VIN: 2G1FP22S0S
Vehicle came in with #4 cylinder not contributing, injector not pulsing. Ohm test of injector was around 12 ohms, power was supplied to injector, but no ground pulse from pcm. Noid light not flashing on connector. Tested at pcm and found no ground pulse at pin...
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1998 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC1241W
This vehicle will start and run for 2 seconds then die. I have no communication with the Airbag module, Instrument cluster , or ABS module. I tried unplugging the modules individually to see if communication was restored and it was not. I have been through the... Trouble codes: P1629 (Theft Deterrent malfunction), U1016 (Serial Communications Malfunction)
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1998 Chevrolet Corvette 5.7L driver info center VIN: 1G1YY32G6W
thank you in advance to anyone responding, the dash cluster seems to be operating fine, however the driver info center does not display any info. the customer says the chime will go off like when the message center would usually indicate a low tire or any othe...
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2003 Chevrolet Silverado 1500 4.8L MIL Lamp on VIN: 1GCEK14VX3
came in for p0446 checked vent valve found bad replaced with updated solenoid.tested system ok test drove no concerns came back 2 days later same code checked solenoid bad again replaced again passed all test came back 2 days later p0446 again checked canister... Trouble codes: P0446
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2003 Chevrolet Suburban 1500 LS 5.3L No Start VIN: 3GNFK16Z63
I have this 2003 chev. suburban with a 5.3l, this truck will not start unless you wait 3 to 5 seconds for the fuel pump to build pressure, if you wait longer then that the pressure drops to 0 in almost 30 sec. Also if you go to start the truck right away befor... Trouble codes: P0430 (cat. efficiency below threshold)
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2006 Chevrolet Cobalt SS 2.0L rough shifting 1st speed VIN: 1G1AP14P46
we're experiencing rough shifting the first time of shifting once the clutch is pressed it shift smooth but the first time of shifting is rough which wasn't the case in the beginning check the repair history below we've used valvoline full synthetic 75-90W in...
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1996 GMC Jimmy 4.3L vents VIN: 1GKDT13W8T
Have a problem on max ac mode. When in the max ac mode, not getting sufficent volume at center vent. getting most at feet. when accelerating lose the center vent flow until throttle is released.Do not lose any flow on any other mode, just max ac. This sounds l...
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1998 GMC Savana 2500 5.0L Misfire VIN: 1GTFG25M4W
Came in 2 months ago with misfire complaint in a.m. Tuned engine and cleaned injectors. Customer says still doing it but now he has white smoke out tailpipe and antifreeze smell. Verify misfire codes and history shows mostly cyl 1 and 3. Pulled plugs and 1 and... Trouble codes: P0300
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2003 GMC Sierra 2500 HD SLE 6.6L power mirror VIN: 1GTHK231X3
Have this pick up in the shop with a power mirror problem. Truck is equipped with curb assist option where the mirror automatically points down at curb when put into reverse. The problem is that the mirror on the driver side only, goes down to show the curb wh...
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2003 GMC Sierra 1500 SLE 4.8L cranks VIN: 1GTEK19V03
Ok so here I am again scrathing my head. I have a GMC truck that was running fine and gets brought in on the hook. It cranks for 3-5 seconds then cuts out. It sometimes cranks longer, when it does I only sometimes have reference. I have no spark and no fuel. I...
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2007 Hummer H2 6.0L auxilliary ac
hello,and thanks for any help you may be able to offer.this is a stretched limo built by krystal coach.it came in w/aux a/c inoperative.primary ac working.it has a seperate compressor/condenser/evaperators for the aux. system.found system discharged,and a smal...
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2001 Pontiac Bonneville SE 3.8L Surge VIN: 1G2HX54K71
This vehicle came to us from another shop with a new fuel pump,filter, plugs, wires, tps, mass airflow sensor. between 60mph to 70mph on acceleration there is a consistent surge as you accelerate. hard acceleration it goes away. We unplugged th egr valve no ch...
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2001 Pontiac Aztek 3.4L ign sw VIN: 3G7DA03E11
hello fellow techs this one is driving me bonkers! the vehicle will start when i ground the yel/blk wire (pin76)at the pcm.i have batt voltage at the yellow wire in start position.i have nothing at the crank request signal wire in start position (pin23)at pcm....
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2001 Pontiac Aztek 3.4L Poor Idle Quality VIN: 3G7DA03E21
Hello everyone & thanks for taking time out of your busy day to read my help request. I have this 2001 Pontiac Aztek that has a high idle at times. This never happens until the vehicle has been driven for a few miles. Go to start it up, idles fine. Drive for a... Trouble codes: B3840, B3841
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2004 Pontiac Grand Am GT 3.4L starter/ecu VIN: 1G2NW52E14
To all valued techs Car will crank for about one second or less then stop .It will sometimes just startup and run but not often . When it cranks you can see on the tech 2 pid starter ON then OFF the same timeframe . We have checked codes none also the antith...
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2006 Pontiac Torrent 3.4L compressor VIN: 2CKDL73FX6
I have a Pontiac that will not engage the ac. On computer scan of the system it lists the compresser disengaged due to anti-stall? The body control computer list engagement when the switch is pressed. Pressure in system is 111psi on high side.Any ideas? Thank...
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Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Regal GS 3.8L Cuts out, Stall VIN: 2G4WF5212X
The fuel pump, fuel filter and a new ballast resistor were installed, also the harness connector at the pump was replaced. it has been a week and no return. If propblem roccurs I will post again, thanks for everyones assistance.
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1993 Chevrolet C1500 Suburban 5.7L shift quality VIN: 1JMND452D2
sorry for the delay!!!car has been fixed.turned out the 4LO wire was sending a false signal to the pcm.repaired the wire and presto!!!I have regular shifing.thanks for all the help.
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2001 Chevrolet Impala 3.4L No Power VIN: 2G1WF55K01
Hi Folks, It was a bad catalytic converter. One piece of the converter had a formed a ball and plugged the outlet when under full load. I did my back pressure tests in the shop with the car in neutral. I got 21 replies most of which said recheck the coverte...
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2005 Chevrolet Silverado 3500 6.6L MIL Lamp on VIN: 1GCHK33215
Well thanks for the responses. The tsb repaired it. It consists of a new pigtail that plugs into the injector. Comes with two of them For Cyl. #2 and #7. Actually by wiggling the old connector in the shop it stopped the problem. I actually found some other inf... Trouble codes: 207 (injector 7 control circuit), 2146 (injector pos. voltage control circuit group 1).
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2007 Chevrolet Suburban 1500 LTZ 5.3L No Start VIN: 1GNFK16307
thanks to all who replied did power flush on fuel system turned car loose so far so good thanks again really hot here 90s with hi humidity
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2001 GMC Sierra 2500 HD SL 8.1L Crank Sensor VIN: 1GTHK24G61
Thanks to all replies. All great ideas, unfortunatly even with the engine out, we had a hard time getting the whole sensor out of the block. We finally got the last piece(only about 1.5 inches) out by drilling & tapping in a screw. The old sensor was very brit...
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2002 Saturn SC1 1.9L long cranking VIN: 1G82P12802
I replace ignition module and coils, so far customer is not back Trouble codes: P0171.
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