GM Automotive Technicians Technical Discussion and Fixes for Apr 26, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1988 Buick Regal Limited 2.8L Stall VIN: 2G4WD14W0J Hello . I've got this buick in here, with a stalling problem. Once the engine gets hot, it will stall at idle and bogs when acclerating from a stop. The thing is, it starts right back up every single time. No codes, all scanner values check out good. Fuel pres...	View
	2000 Cadillac DeVille DTS 4.6L mode selection VIN: 1G6KF5799Y all air movement was coming out of the floor with a clicking sound coming from the dash area. Replaced the mode door actuator. Now all the air movement is coming out the top vents and will not change for heat or defrost. Mitchell call for recalibration of the ...	View
	1988 Chevrolet Cavalier 2.0L No Start VIN: 1G1JC1114J Hello Techs, 1988 cavalier no start. no inj pulse and no spark. How can I isolate Module or ECM? Pulled crank sensor (not part of module) and inspected, looks good and clean, no cracks. hooked CPS up to digital volt meter and get .5 volts AC with a small magne...	View
	1990 Chevrolet K1500 Silverado 5.0L Excessive Emissions, No Start, Poor Idle Quality VIN: 1GTDK14K3L Hi techs. Guy brought this truck to us from another shop. His complaint was that he parked the truck for two weeks and when he started it it ran very rough. Took it to the other shop and they replaced the plugs, wires, dist. Cap, rotor and air filter. Truck wa...	View
	1990 Chevrolet Corvette 5.7L VATS, HVAC, Radio VIN: 1G1YY2386L This is going to be a little long. This Vette came to me with the odometer not working wouldn't switch from trip to mileage and none of the fuel data would work, Diagnosed bad body module, couldn't find one so the customer had me pull it and sent it in to card...	View
	1991 Chevrolet C1500 Silverado 5.7L Poor Idle Quality, Surge, Stall VIN: 2GCEK19K1M Never thought this would happen, but this is my own vehicle I am posting. My faithful pick-up truck needed a motor. It was running OK but burning oil and needing a head gasket job. I got a rebuild (complete long block - all sensors, manifolds, etc. . . are fro...	View
	2000 Chevrolet C3500 7.4L fuel gauge VIN: 1GBKC34J3Y replaced both tank units initally,still no gas gauge reads empty,insatlled ballance module & relay , still ng- got good used cluster no change, had same year truck in for service- swapped out computer still no change still reads empty on both clusters. , check...	View
	2001 Chevrolet Malibu 3.1L No Start, Anti-Theft System VIN: 1G1WE52J61 Hi, This car keeps activating the anti-theft system and the engine won't start. I (or the owner) will reset the system and get it started, but a couple days later it happens again. This used to happen only once every few months, but now it's been happening eve...	View
	2004 Chevrolet Blazer LS 4.3L shift motor VIN: 1GNDT13X74 Hello to everyone. I know this is a relatively easy system to diagnose but we just can't seem to get to the bottom of this. The customer stated that all lghts on the 4WD switch would intermittently start blinking as they were driving down the road and the syst...	View
	2004 Chevrolet Avalanche 1500 Z71 5.3L Noise VIN: 3GNNEK12TX The problem is when you are driving intermitently it makes a loud ratcheting noise which can be felt through the floor.It makes the noise going straight sometimes and sometimes on a slight turn.We cant make it do the noise by doing figure 8s or accelerating or...	View
	2007 Chevrolet Silverado 1500 HD Classic LT 6.0L MIL Lamp on VIN: 2GCFK13Y87 Truck came in with very hard upshift when service stabilitrak light came on. looks like i need to replace the camshaft position actuator solenoid to fix the problem although i cannot find one. the camshaft actuator is actually the gear and there is a magnet th... Trouble codes: C0561 (c0900-), C0900, P0011, P2119	View
	2006 GMC Envoy SLE 4.2L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1GKET16S46 Good morning, I have an '06 Envoy here that when cold intermittently it will stall, no power, backfire in intake, misfire, MIL illuminated. Here is the story, the MIL has been illuminated for over a year, she has had the vehicle to several places who accordin... Trouble codes: P0172 (Lean bank 1), P0300 (Random misfire)	View
	2006 GMC Canyon SLE 3.5L Cmp Actuator VIN: 1GTDT19656 This Camshaft Position actuator solenoid valve (mouthful) seems to have eaten a screen or two. There are 2 screens on it, and I suspect there were 2 more at one time. I doubt I can get the screens seperately, so I believe we will be replacing the valve. At thi...	View
	2002 Oldsmobile Silhouette GL 3.4L Chimes/indic VIN: 1GHDX23E92 Approximately 2 days after the removal and replacment of rear air shocks and front brake pads and rotors, the chime (door ajar, keys in ignition etc) indicator randomly rings numerous chimes in a row and then will stop. There is no pattern, evident conditions ...	View
	1994 Pontiac Firebird Trans Am 5.7L no up shift VIN: 2G2FV22P4R we have a car we can't get it to communicate with any of our scanners. it came in for the trans with no up shifts. we tried disabling different modules and sensors, abs, vss,trans, ect...we also replaced the pcm, sence it had water running out of it, but we st...	View
	2003 Pontiac Aztek 3.4L dash cluster VIN: 3G7DA03E73 customer came in, failed mass state inspection for no check engine light, i removed dash cluster to find out someone snipped the bulb off the circuit board. the bulbs/led's are not replaceable. well gm has an exchange program, but has no units to exchange. so ...	View
	2005 Saturn Ion-1 2.2L Hesitation, Cuts out, MIL Lamp on VIN: 1G8AM12F35 This vehicle has an intermittent miss which feels like an ignition misfire or a lockup converter chugging around 80 , we have done the most common tests and component replacements on it. It's still missing. When the problem occurs, the check engine light flash... Trouble codes: P0300, P0336	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2005 Cadillac SRX 4.6L Pump/Pressure Hose VIN: 1GYEE63A65 This was a very straight forward repair. The hose assembly from GM comes complete. The GM diagram I received was incorrect and confusing. The coupler installs into the pump and the power steering hose assembly snaps into place. This is a one time deal and...	6
	1994 Chevrolet Camaro Z28 5.7L evap temp sensor VIN: 2G1FP22P9R well I have to call it fixed, found that the pcm will ground the ac relay when ever it decides to and then the system works just fine. He took it to Texas over the weekend and it worked good all the way. Will replace the ecm when He decides to.	3
	1997 Chevrolet Express 1500 4.3L No Start, Hesitation, MIL Lamp on VIN: 1GCFG15W5V well everybody said distributer and one said crank sensor connector. I replaced the distributer as recomended gear was worn a bit but was still getting -60 cam retard .After removing vcm and seeing nothing but corrosion I replaced it with a used unit and all p... Trouble codes: P0101, P0102, P0143, P0171, P0300, P0340.	10
	1998 Chevrolet C1500 Silverado 5.0L Hesitation VIN: 1GCEK19M5W well thank you all for your help. I didn't fix this vehicle in my carrer this is like the 3rd and is not a good feeling customer just did't want to leave it any longer he had to drive it. I change MAF, Fuel filter, fuel pump, back pressue tesed the cats, and a... Trouble codes: N0.	16
	1999 Chevrolet Silverado 1500 LT 5.3L Auto 4X4 VIN: 2GCEK19T7X Numerous replies that mentioned to measure the wheel circum. completed and eliminated the whining and then the auto 4x4 would only engage when slippage was occuring. this site is awesome for info and i appreciate all the help.	8
	2000 Chevrolet Astro 4.3L Sir VIN: 1GCDM19W0Y Thanks for the info I got the dealer set it up Thanks	3
	2004 Chevrolet Silverado 2500 6.0L electric braking VIN: 2GCEK19U24 Thank you all for the responses, the vehicle finally never came here, it was towed to a gm truck centre in ottawa who found the problem to be a simple rear abs sensor, this vehicle has 4 wheel disc brakes. Tech there told him gm stopped making 4 wheel disc on ...	13
	1997 GMC C1500 Suburban 5.7L transfercase VIN: 3GKFK16R9V the customer told me several times that he has to do something with it cause he was worried that it would shift into 4x4 low while moving which would be mechanicly impossible to get the front axle splines and collar to lock together while moving but anyways we...	4
	1999 GMC Yukon SLE 5.7L Poor Idle Quality, Cuts out VIN: KEK13R9X1G Sorry this fix took so long to post, we had to stop and make some money on some other things. First and for most, thank you to everyone who responded to my nightmare. Most of which had great ideas which we gave a try. The issue ended up being a faulty aftermar...	14
	1989 Oldsmobile Cutlass Supreme SL 3.1L Poor Idle Quality, Hesitation, Surge, Stall, MIL Lamp on VIN: 1G3WS14T1K ended up replacing the ecu for a second time and vehicle has not come back. Trouble codes: 33 (map sensor high), 34 (map sensor low).	15
	2004 Pontiac Grand Prix GT1 3.8L Blower motor VIN: 2GWP522141 This vehicle is still not fixed. Most replies said to check the cabin air filter or direction of rotation of the fan motor. The mechanic had all ready verified that the fan was going in the correct direction and the cabin air filter had just been changed. I...	18
	2001 Saturn LW300 3.0L Timing Belt / Valves VIN: 1G8JW84R92 Thanks to all that replied. Almost all of you said that the motor has at least bent valves & cracked guides. Some even said that the pistons may be bad. I would tend to agree with the later as well and the motor needs to be replaced. However . . Due to the...	19
	2002 Saturn L200 2.2L The Car VIN: IG8JU54F62 Thank you all for responding, I was schooled on basics. rebalanced all tires and shifted them around to end up with the best on the front. Problem was corrected , THANKS AGAIN!	9

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