GM Automotive Technicians Technical Discussion and Fixes for Apr 25, 2011 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick Century Limited 3.1L MIL Lamp on VIN: 2G2WY52M9W Car came in with below codes, checked scan data and fuel trims -25% to -30%. Checked usual fuel pressure regulator-ok, pulled PCV and plugged. Still high. Then found in scan data that purge valve was at 20%. I unplugged purge valve connector and fuel trims cam... Trouble codes: P0172 (Fuel system rich), P0440 (Evap system leak detected)	View
	1998 Cadillac DeVille 4.6L Stall VIN: 1G6KD54Y3W PLEASE READ ALL TEST DATA AND POST BEFORE REPLY. Car came in 2 weeks ago on hook with a no start condition. Found bad ignition relay. Replaced with dealer relay. Noticed fuel gauge not working properly and car quit running. Found ground wire for fp and signal ... Trouble codes: P1599	View
	1995 Chevrolet Monte Carlo LS 3.1L timing chain?? VIN: 2G1WW12M2S Quick question on this high mileage 95 Monte, car will fire for a second @ WOT but is noisy & dies immediately, cranks like its out of time, checked compression rear quick this evening on front 3 cyls. (80, 130, 50). If the chain fails or jumps on a 3.1L will ...	View
	2001 Chevrolet Venture LS 3.4L No Start VIN: 1GNDX03E31 Vehicle died on road. Has fuel pressure and spark at all times. Injector pulse only on intial crank, then injector pulse width goes to zero and stays at zero until you cycle key and computer times out. Vehicle will not do bulb check on 'check engine light' and...	View
	2003 Chevrolet Express 2500 6.0L ignition VIN: 1GCHG39U43 After changing above items,no lights in dash at all times,tried relearn procedure for pass key to no avail.Light in dash came on for a period,tried relearn and then no dash lights at all.Did we get locked out or could any of you guys give us some help on this ...	View
	2006 Chevrolet HHR LT 2.2L Electronic VIN: 3GNDA23D76 car has an irratac idle on tach.needle bouncing with speedo when this happens trans shifts bad	View
	2004 GMC Sierra 2500 HD 6.6L Poor Idle Quality, Hesitation, Misfire VIN: 1GTHK23154 Replaced all njectors on bank 1. Found the inlet in a couple of injectors inlet full of what looked like dirt/rust. Customer did not wanted to do all injectors at this time. Before replacing, I checked all the injectors for resistace and broken wires between F... Trouble codes: P1235	View
	2005 GMC Envoy SLT 4.2L 1-2 Shift VIN: 1GKDT13S05 Customer brought vehicle to the shop with a hard 1-2 shift. First go around we did a transmission flush and told him to drive it awhile. He returned saying no change. On my test drive, with moderate acceleration, it would squeal the tires going into second gea...	View
	2001 Pontiac Grand Am SE 2.4L engine VIN: 1G2N52TF1C Got a bit of a weird one here, customer has a very intermittent no start, has no obvious rhyme or reason, just when it decides not to start it doesn't and every time it has been towed to the shop it has started up at the next key cycle and has run beautifully ...	View
	1998 Saturn SW2 1.9L Misfire VIN: 1G8ZK8270W Car came in running poorly, after retrieving codes noticed car had a random cylinder misfire, with two bad oxygen sensors. Replaced all that, took the car on a test drive to find that is had a misfire on cylinder 4 mainly still but you only notice it once you ... Trouble codes: P0137, P0131, P0300, P0341, P1640 (Driver 1 output voltage high), P1599 (CC Power Management Mode or Engine Stall)	View
	2001 Saturn ls 2.2L smokes VIN: 1G8JU82F71 car busted timing chain and bent 6 valves...after repairing timing chain and did valve job car ran good for about 125 miles then it started to smoke and use oil as if the oil is going right into the cylinder.. did compression test all cylinders hit at 160.. di...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick LeSabre Custom 3.8L shifting so after dropping the pan and finding some metallic particles. we decided the transmission needed an overhaul. the fluid changing and filter replacement did nothing, while we were going in we were going to replace the pressure control solenoid as well. the cus...	19
	1998 Cadillac DeVille d'Elegance 4.6L Front end VIN: 1G6KE54Y0W Thanks to all that responded. The overall majority of responses said to replace the axles. The remaining said motor mounts sagging or broken, and a couple were way off base with tire balance. We replaced both of the axles with new parts and the vibration is go...	19
	2001 Cadillac DeVille 4.6L Steering VIN: 1G6KD54Y11 WELL I LOST SLEEP OVER THIS, TURNED OUT WHEN THE FACTORY PUMP FAILED IT FILLED THE SYSTEM WITH FILINGS AND POWER STEERING FLUID WAS NOT SUITABLE TO FLUSH SYSTEM THE FILINGS PLUGGED UP THE PRESSURE VALVE AND IT DID NOT BULID PRESSURE IN THE PUMP I FLUSHED THE S...	11
	2004 Cadillac SRX 4.6L Timing Chain VIN: 1GYDE63A24 Stephen got it right found a bad exhaust camshaft actuator not locking when engine was off.	5
	1986 Chevrolet El Camino Conquista 5.0L Excessive Emissions, Poor Idle Quality, Hesitation VIN: 3GCCW8DH7G Thanks for all the replies. Most agree with me to replace the ecm the customer has ordered an ecm off line. Pretty sure that will fix problem, for car runs good without ecm pluged in, just a little rich. Thanks again.	24
	2003 Chevrolet Tahoe LS 5.3L water seal VIN: 1GNEK1Z34Z well we think this on is fixed? but we need it to rain good! well we believe the problem was the windshield after all, we did find what appeared to be old water stains coming from the left lower corner of the windshield so we are going to wait to see if the ...	10
	2005 Chevrolet Silverado 2500 HD 6.6L Mechanical VIN: 1GCHK23265 EGR valve was bad fooling the MAF. EGR valve was stuck open and did not read that it was stuck open!!	7
	1998 Oldsmobile Intrigue 3.8L Excessive Emissions, No Start, Misfire, MIL Lamp on, Floods VIN: 1G3WH52KOW well i hate too admit it but i was wrong, the car finally came back today no start. i bit the bullet and pulled the throttle body and found the lower manifold full of coolant. in my defense the first time the car was here i did check for coolant behind the th... Trouble codes: P0300 (Ramdom missfire).	30

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