GM Automotive Technicians Technical Discussion and Fixes for Jul 14, 2009 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2000 Buick Park Avenue 3.8L CV joint VIN: 1G4CW52K2Y The problem with this vehicle is a wobble/vibration under acceleration. The wobble only occurs when turning to the left when accelerating between 20mph to 60mph. I cannot duplicate the problem on the hoist. The front engine mount and passenger engine mount hav...	View
	1993 Chevrolet K2500 Cheyenne 5.7L Hesitation, Surge, Cuts out VIN: 2GCFK29K9P You all geat and helped once before. this came in weakand half ago for tune missing veary bad. found wires on exhust cap little dirty, replaced all igntion and fuel filter. Strarted ran poor in shop at idle checked timing found 15 degree advance on timing base...	View
	1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L Electronic VIN: 2GIFP22P6P Hi guys.I have probl. with this nice car.Car ha no air con, when cam in the shop.Nofreon R 134a inside. It had hole on the condensor, ac compresor vas leaking, and had leak on the lines conecttions.Had no codes in ECM. So I change this parts , recharge, no lea...	View
	1996 Chevrolet C1500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 2GCEC19R4T VEHICLE CAME IN CHECK ENGINE LIGHT ON. MISFIRES ON #3 AND #6 according to counter. [...] dist cap, coil firing, plug wires firing. compression good. vacuum test good. fuel pressure within spec. replaced #3 and #6 injectors and then all but #6 cylinder were... Trouble codes: P0303, P0137	View
	2000 Chevrolet Camaro Z28 SS 5.7L Alternator VIN: 2G1FP22G4Y I have been having an intermittent problem on my Camaro for the past year or so. When I rev the engine, whether it be driving, or stopped, the alternator stops charging. Tested the alternator and it fails. I have been through over 10 Alternators with this car ...	View
	2000 Chevrolet Monte Carlo SS 3.8L coolant fans VIN: 2G1WX12K2Y I replace the radiator fan assy. because one motor was noisy. I used a Dorman 620-616 fan assy. Now the coolant fans will not come on (the original assy. would) with or without the A.C.request.I can use a scanner and turn on either or both fans and make them ...	View
	2001 Chevrolet Suburban 1500 5.3L Poor Idle Quality, Surge VIN: 3GNFK16T61 hi everybody,i have 01 chevy suburban with a weird acceleration problem it only hapens right at 60 miles per h vehicle jerks a litle bit back and foward and then over 60 works fine it misses a bit at idle also but fuel presure is ok injectors ok coils ok no uo...	View
	2001 Chevrolet Astro 4.3L Ignition switch VIN: 1GCDM19W11 This Cargo van is used for Scuba diving tours, parked near shore often. The ignition switch wont turn to the start position. I jumped the starter at the starter to move the van to a parking stall and ordered a switch, electrical. When I removed the switch from...	View
	2003 Chevrolet Venture LT 3.4L suspension VIN: 1GNDX13E63 Intermittantly makes light popping noise from right front on left hand turns. has anybody ran across this before? Wheel bearings are quiet and tight. ANY HELP WOULD BE WELCOMED. Thanks in advance.	View
	2003 Chevrolet Trailblazer North Face 4.2L No Start VIN: 1GNDT13S23 Any help appriciated. Is anyone successfully reprogramming (on board) PCM's on Trailblazer's or Envoy's? In the past 3 months I have KILLED 3 PCM's on said vehicles. Cust came in with trans shift problems and I had found calibration updates for improved shi...	View
	2003 Chevrolet S10 4.3L Hesitation, MIL Lamp on VIN: 1GCCT19X23 I actually owned this truck since it was new and now my brother in law has it and it seems to have developed a rather odd problem. He said it was running funny and the service light was intermittent. Upon scanning it the ecm reported that it detected a cylinde...	View
	2005 Chevrolet Cobalt 2.2L power steering VIN: 1G1AK52F65 Customer`s complaint is intermittant loss of p/s.Vehicle has electric power steering under the dash.Cycling key OFF and then ON again restores p/s. No codes in any systems.Any help would be greatly appreciated! Thanks John	View
	1996 GMC Jimmy 4.3L dies when stopping VIN: 1GKDT13W8T customer drove car about 35 miles and called saying car ran great and then strated to die when coming to a stop, would immediately restart and drive fine until coming to another stop, would die but always restarted. I installed a fuel pressure gauge . when sta...	View
	1995 Pontiac Firebird Formula 5.7L wheel studs VIN: 2G2FV22P0S car snapped off left rear wheel studs--can not replace studs due to abs / ring--has anyone ever removed and reinstalled this ring without breaking it--accordind to gm manual i have to replace the axle which is no longer availabe	View
	2000 Saturn LS2 3.0L Compressor VIN: 1G8JW52R4Y Thanks up front for any help with this car. It has many problems that may or may not be related. Customer came in with a complaint that his a/c didn't work since going through a automatic car wash and hearing a popping sound. Thought it blow a hose but it didn...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Buick Skylark Limited 2.4L heater core VIN: 1G4NJ52T9V Hey Guys, thank you for the very helpful infomation. Electrolysis is a growing problem. I changed the water pump and flushed system etc . i have a lower voltage at the coolant tank (i.e.50 milli amp)I am thinking my troubles with electrolysis are over..thanks...	18
	1938 Cadillac lasalle 353CID no turn with my own 50 years and the very helpful 7 replies , I will install the marvel mystry oil in clyinderss and let it sit , the big help was not to use carb cleaner in carb and disconnect fuel line and run a hose to a bucket , will hand crank at first -and sho...	7
	1990 Chevrolet Corvette 5.7L blower volume VIN: 1G1YY3388L i am still waiting for parts on this vette, i tore the dash apart and found air duct not secured correctly to main housing causing air leak before getting to diffusers, as far as the temp control problem i dont know yet,pinpoint test lead to control head but n...	14
	1997 Chevrolet Cavalier 2.2L cooling VIN: 1234FH76K9 Thanks to all who told me to vacume lift the coolant. put therm. in and vacume lifted it and temp is now running a cool 190'. I don't beleive those who told me 217' was normal running temp. With 3/4 temp guage. Thanks again.	17
	1997 Chevrolet C2500 Suburban 7.4L brake light switch Thank you all for taking the time. Peter and Carter seem to have the idea that the brake pedal is missing a stopper. This would keep the pedal from coming too far upward and slamming against the switch. The way these switches are breaking, I would have to agre...	6
	2003 Chevrolet Cavalier 2.2L Mechanical VIN: 1G1JC12F53 Vehicle never did die for us while in our possesion. Had it for over a week. Problem started after fuel pump replacement. Replaced wiring harness to the fuel pump and no problems since. Thanks for ALL your help!	10
	2003 Chevrolet Impala 3.4L Unknown VIN: 2G1WF52E73 We did the GM reprogram and the problem hasn't come back, although we beleive that sol in the trans probably was just sticking and the clean fluid freed it up.	9
	2005 GMC Canyon Z71 SL 3.5L ABS light on VIN: 1G1CS19665 Well this one is fixed. We replaced the left front hub, wheel speed sensor as one unit instead on just the wheel speed sensor. Client has driven it for about one week and everything is good. Thanks to all. Craig	4
	2003 Oldsmobile Bravada 4.2L abs, sir light VIN: 1GHDT13S23 well the ign switch fixed it. i was very surprised. thanks for all the help. i never could pin point a voltage drop on any of the feed circuits from the switch, but with so many replies leaning toward a switch, we opted to try it.	5
	1997 Pontiac Firebird Formula 5.7L Poor Fuel Economy VIN: 2G2FV22P0V Sorry for the long delay. I had a personal matter to deal with. The car came back in, and I replaced O2 sensors and this helped, but did not bring fuel trims low enough. They were about 12 to 15+. I checked for tsbs and found a recall on AIR pump. I checked a...	18
	2002 Pontiac Grand Prix GT 3.8L abs VIN: 1G2WP52K92 Thanks for all the replies. We have double checked harnesses front to back, pulled,tugged wiggled, heated--- nothing. Have inspected all harnesses at sensor & module--- nothing. Customer needed the vehicle so we waiting for them to return it when they have tim...	11

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