GM Automotive Technicians Technical Discussion and Fixes for May 5, 2009

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	Help Request	Answers
	1995 Buick Riviera 3.8L MIL Lamp on VIN: 1G4GD2211S Hello all. Hopefully some one can point me in the right direction. The two codes that keep returning seem to be at the same time. Performed flow chart testing for both codes but only the EGR test was definitive in failing the part but the EGR has been replaced... Trouble codes: P1640, P1406	View
	2001 Buick LeSabre Custom 3.8L Mechanical VIN: 1G4HP54K51 This is old lady vehicle that we have maintained, in very good shape. She has all of a sudden noticed her oil light on. While level was checked it was 1 qrt low on engine oil. We topped it off and a week later the same occurred. We then replaced pcv valve (kno...	View
	1997 Cadillac Seville STS 4.6L head gasket VIN: 1G6KY5298V Hello there I have this Caddy here that it gets hot while driving. I have already talked with you all about the cause but I am about to pull the engine and remove the heads and install the inserts. My question is is there any tips or tricks I need to know to p...	View
	2005 Cadillac CTS 3.6L Poor Idle Quality, MIL Lamp on VIN: 1G6DP56765 Caddy 3.6L varible cam timing issue. Wow, this is quite an engine. Hard to think that after varification of codes listed and reading up on how it works, the next percedure is to check the 3 timing chain alighnments. I am able to control all cam actuators, and ... Trouble codes: P0008 (engine position systen performance bank 1), P0009 (engine position systen performance bank 2), P0016 (cam/crank correlation intake cam), P0017 (cam/crank correlation exhaust cam), P0018 (cam/crank correlation intake cam), P0019 (cam/crank correlation exhaust cam)	View
	1969 Chevrolet C-10 350CID Starter & Flywheel VIN: CE249S8281 My boss bought this truck a couple of years ago for resale.A previouse employee replaced the starter and flywheel because the teeth were ground to death. Still had problems starting, so the truck was parked in storage. Fast forward a year, he pulled the truck ...	View
	1991 Chevrolet P Chassis 7.4L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 1GBKP37NXN OK guys this is a simple one but I am missing something here. Motorhome has a chev 454 TBI engine. When it is cold it starts well but as it warms up it starts misfiring and will sometimes die. Then it will not hardly start. If you are driving it while it is wa... Trouble codes: 42 (electronic spark control)	View
	1995 Chevrolet Astro CL 4.3L MIL Lamp on VIN: 1GNDM19W8S The vehicle originally came in with the check engine light on, running poorly, & no communication back in nov 08. We check data connector wiring to ecm - ok, check powers & grounds - ok, installed ac delco ecm, had communication, test drove - no codes, shipped... Trouble codes: 53 (System Voltage too High)	View
	1999 Chevrolet C1500 Suburban 5.7L No Start, MIL Lamp on VIN: 3GNEC16R2X Truck towed in dead batt. Charged batt, no codes, tried to start cranks over no start. After let off starter engine contiues to turn one or two more times and air comes out of throttle. While trying to start it set p336 CRK SNSR A out of range. Have power to s... Trouble codes: P0336	View
	2000 Chevrolet Astro 4.3L No Start VIN: 1GCDM19W3Y Hello, Chevrolet technicians. I just had a car that was towed to my shop. The car didn't start. When I cranked the engine, the field pressure was 63 psi. I checked the spark wire and it had a good spark coming out. After that, I checked the compression and it ...	View
	2002 Chevrolet Venture LS 3.4L automatic level control The ALC compressor will run, fill shocks to proper level, then vent slowly thru compressor vent hose until level goes down. It will then kick [...] on and start all over again. Ran testing per Mitchell and replaced relay. Still same problem. Shocks were replace...	View
	2002 Chevrolet Camaro Z28 5.7L spark/pulse VIN: 2G1FP32G12 Hello fellow techs.have this 02 z28 has cranck but will not run at times.battery,starter,charging is in good condition.vehicle will cranck at all times,but will not run,has fuel pressure,NO spark and NO injector pulse.cranck position shows good,I changed it an...	View
	2002 Chevrolet Trailblazer LS 4.2L No Start VIN: 1GNDS13S02 This TB has an intermittent no start after brief shut down. You can drive to the Post Office, go in and do your business, when you come out it may not start. I can hold the accelerator to the floor, like a clear flood, and it will start. Puffs smoke out of tai...	View
	2002 Chevrolet Astro LS 4.3L Misfire VIN: 1GNEL19X82 greetings to all this astro van had come in for misfire codes.started doing some testing and i saw cylinder 4 misfiring while watching my misfire counters.i swapped plugs and wires with cyl2 and the mis stayed acylinder 4.i proceeded to do a compression test o... Trouble codes: P0300, P0304	View
	2002 Chevrolet Impala LS 3.8L cooling fans VIN: 2G1WH55K92 hello friends, having a intermittent fault with the cooling fans. at times the fans operate with both low and high speeds properly. sometimes as the temperature increases past 218f the low cooling fan does not come on. the temperature goes past 3/4 and neither... Trouble codes: N0NE	View
	2004 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Surge, Cuts out, Stall, MIL Lamp on VIN: IGND513525 Customer brought truck in with idle problem. When the truck gets hot it will surge for a few mins. and cut off. With scan tool hooked up when it acts up engine load goes to 100%, the map readings seem fine. Do not know if maybe no throttle responce from comput...	View
	2005 Chevrolet Malibu 2.2L evap monitor VIN: 1G1ZS52F35 vehicle will not pass im test due to evap monitor showing not ready. no trouble codes. when i drive the vehicle in the morning with scanner attach the evap status and evap test starts out with no response then the evap test switches to on. the evap test runs t...	View
	2006 Chevrolet Uplander LS 3.5L converter / transmission VIN: 1GNDV23L36 I haven't serviced this vehicle before. Trans slips very bad on take-off or during harder acceleration. Shudders very badly. NO DTCs. Doesn't matter if I start in D, 1, 2, or 3. Nothing that looks abnormal in trans data. It will shift into all gears. Fluid is ...	View
	2008 Chevrolet Colorado LT 3.7L Misfire VIN: 1GCDT13E18 Ok here we go. This wonderful vehicle is a SALVAGE vehicle bought at a used car dealer with no warranty as is. This thing was in a head on collision previously, bad enough to put the engine in the firewall about 4-5 inches. Anyway body shop hacked this thing u... Trouble codes: P0300, P0304	View
	2004 GMC Sierra 1500 SLE 5.3L steering wheel VIN: 1GTEK19Z84 Driver complaint and I varified, noise heard in cab, and can feel on steering wheel while only turning left. Noise goes away with wheels off the ground, but returns if resistance is put on wheels. Noise is a dry squeek sound. Checked all steering linkage and b...	View
	2006 GMC Yukon SLT 5.3L drivetrain VIN: 1GKEK13T26 this truck has a vibration at 52-54 mph only- not real bad but is there.it feels like a drivetrain vibration rather than a tire vibration .the vibration will go away if you shift into 4-wheel auto.the vibration is still there w/out the ft driveshaft in the tru...	View
	1997 Oldsmobile Regency 3.8L Electronic level control VIN: 1G3HC52K2V Originally, vehicle was brought in for routine replacement of struts front and rear due to worn out, spongy units. Replaced all four corners and everything seemed fine for about a week and a half. Customer returned today commenting the rear suspension was si...	View
	1992 Pontiac Grand Prix SE 3.1L Ignition VIN: 1G2WJ14T8N Has anybody come across with an ignition problem with these older GM products,92 Gran Prix 3.1 litre came in no start,cranks OK no spark replaced crank sensor,and module,now there is spark,but apparently at the wrong time,it tries to start but kicks and bucks,...	View
	2003 Pontiac Grand Prix GT 3.8L Cuts out, Low Engine Power VIN: 2G2WS52204 Hi Everyone, Customer brought vehicle in after short drive with the complaint of no power, test drove and found 'Service Traction Control" light in Driver Information Center was on also "Reduced Engine Power" light on in DIC. The vehicle will idle perfect but... Trouble codes: P1518	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2004 Cadillac SRX 4.6L trans over heat VIN: 1GYEE63A74 Re: 2004 Cadillac SRX 5L50E Transmission I am sorry that the information was not very complete at the initial post. But this is what i know after extensive amount of work to get to the bottom of the problem, We were able to get our sonnax flow meter in line ...	5
	2000 Chevrolet Silverado 1500 4.3L Hesitation, Surge, Cuts out, MIL Lamp on VIN: 1GCEC14WXY I want to start off with thanking everyone who has replied. Unfortunately the vehicle has not been fixed. truck is totaly drivable, just not right 100%. Customer doesnt have the funds to go any further. If i have a chance to fix it in the future i will post th... Trouble codes: P0131, P0151, P0171, P0174.	26
	2001 Chevrolet Camaro 3.8L Reduced Power VIN: 2G1FP22K81 The fix on this one was multi part, some as result of others that had been into it before. The terms were spread at the PCM, replaced. Replaced the TAC Module/pedal assm, could tap it and make the problem clear. Then after all the times I had tested it, it cam... Trouble codes: P1518 (Loss of serial data between PCM and TAC module/Reduced Power Mode).	7
	2001 Chevrolet Silverado 2500 HD 8.1L Stall VIN: 1GCHK23G81 hello everyone, thank you all for the help, it was very appreciated, after a lot of drilling, cussing,(mostly about the engineering) finally it came out, the way i did it was by heating a decking screw until red and melting it in to the sensor. this worked aft...	12
	2003 Chevrolet Silverado 3500 LS 6.6L cluster VIN: 1GBJK39113 thanks to all who replied--i found wiring rubbing on clutch pedal assembly.it is very difficult to get to to repair .repaired and installed hose around harness to insulate from contact.all is good now .	4
	2006 Chevrolet Malibu Maxx LT 3.5L Steering VIN: 1G1ZT63856 I ended up replacing the complete steering column. The column comes with the sensor and thats it had to re and re the motor assembly multi swith and wheel Did take note that the gear inside the old unit for the motor assist is plastic like and it was a little ...	2
	2006 GMC Sierra 2500 HD SLT 6.6L Glow Plug VIN: 1GTHK23DX6 After letting the truck sit for a while after I programmed the flow rates, it seemed to take. I dont know if it was a communication error or what. I let it sit overnight and started it cold, so the plugs cycled and all seems well for now. Thanks to Roger fo...	1

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