GM Automotive Technicians Technical Discussion and Fixes for Apr 6, 2009 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP52K9W lt trim 5-6%, no diveability issuses Trouble codes: P0133 (o2 sensor slow response)	View
	1992 Cadillac DeVille 4.9L Excessive Emissions VIN: 1G6CD53B2N I have this 1992 Cadillac Sedan Deville. It runs rich all the time. It will go into closed loop but int. and block learn always stay at 128. The only way I can get it to halfway have any fuel control is do a blm reset using the scanner. Once I hit reset the in...	View
	1999 Cadillac Catera 3.0L Hesitation, Misfire VIN: W06VR52R1X Does anyone know if the o2 sensor should have battery voltage key on engie off to the heater circuit? This one does not. Which fuse in the fuse panel below the stearing wheel is supplying the heater circuit for this o2 sensor? This car has cold driveability pr... Trouble codes: P0155 (Bank 2 O2 Sensor 1 heater circuit failure)	View
	2002 Cadillac DeVille 4.6L air bag VIN: 1G6KD54Y12 2002 Cadillac here that will intermitently turn the air bag lite on and have several codes, B0029 Pass deployment loop/B0030 Pass deployment loop short to ground/[...] deploment loop/B0065 Drivers pre-tensioner deployment loop open, I don't have complet...	View
	2004 Cadillac CTS 3.6L MIL Lamp on VIN: 1G6DM57704 No power in drive or under load. Engine revs fine in park and neutral. Saw the GM TSB on throttle body and pigtail replacement but don't think this is the issue. Engine has run fine under load that seemed to be intermittent but now no power and MIL when in gea... Trouble codes: P2138	View
	1991 Chevrolet Camaro RS 5.0L Poor Idle Quality, Cuts out, Stall Hi Techs,I am having trouble finding out why this engine will stall when warm. We worked on this car a few weeks ago an the idle was ok. It was brought back for a tune-up,plugs,wires, Dist. cap, rotor,fuel filter,pcv valve,(cust. put this in) and now it runs v...	View
	1998 Chevrolet K1500 Cheyenne 5.7L No Start VIN: 2GCEK19R8W wondering heard from one at dealer sensor in door possible failure?? im sure someone has been though this would greatly appreciate info thank you note can start by spraying starting fluid into intake will run,stay running.when warm truck starts with delayed t...	View
	2000 Chevrolet Tahoe LT 5.3L Unknown VIN: 1GNEK13T2Y Hello there I've got this 2000 tahoe with a 4l60e truck just came to my shop after a muffler shop sold a tran service. Which did not fix problem no codes to go off of, trans has delayed shift through all gears but 1/2 worst any ideas. Thank you guys for all th...	View
	2002 Chevrolet Malibu 3.1L Tcc Apply GM techs: This car applies the Tcc solenoid at 99% duty cycle all the time. Can be commanded off and harsh shift up and down goes away. As soon as TCC is left to its own devices, it applies at full duty cycle, and slip is reduced to 0. The PCM is commanding th...	View
	2003 Chevrolet Silverado 2500 HD 6.6L Hydra-booster VIN: 1GCHK23103 Less than a month after the previous repair the vehicle came in with brakes dragging slightly, pedal would pull 1/2" toward floor with rpm increase, extremely sensative brake pedal, right rear slide and anti-lock activation at times. Determined to be Hydra-boo...	View
	2005 GMC Envoy SLE 4.2L head VIN: 1GKDT13S15 r/r head broke tap 8 out of 14 head bolts acording to gm this is normal , removed all broken bolts in block retapped using m11/2.0 got new head all new bolts installed head torqed head bolts first 22ftlbs then went to go to 155 degress of turning torque broke ...	View
	2002 Oldsmobile Alero GL 3.4L security sys VIN: 1G3N52E72C I have an intermittent problem where the 10amp a/c,BFC fuse in underhood junction block blows, preventing the car to start due to alarm system preventing starting. In checking the wiring diagram, I see this fuse feeds the ac relay and also the BCM. I have disc...	View
	2002 Pontiac Grand Am SE 2.2L Poor Idle Quality, Stall This car is surging and idling rough,also has noise in chain area. I read in the knowledge base that a Cavalier with same symptoms had cam timing issue. My fuel pressure, fuel trims and compression check O.K. Vacuum at idle is low, IAC numbers are at 120 and s... Trouble codes: P0300	View
	2003 Pontiac Vibe 1.8L No Start VIN: 5Y2SL62843 car came in on hook crank no start checked fuel pump ok unpluged EFI relay swapped with fog lamp relay same type of relay engine started installed new aftermarket relay test drove ok ... came back on the hook about 900 miles later found EFI relay burned failed...	View
	1996 Saturn SW2 1.9L No Start VIN: 1G8ZJ8273T Vehicle blows 30 amp [...] fuse in underhood relay center. Unhooked ignition switch and problem became intermittant. Wiggled wires and stripped back insulation by steering column and now it won't pop a circuit breaker I installed. Any common area where the...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Chevrolet K2500 5.7L No Start VIN: 1GCGK29ROX thanx for all the responces,found loose ground @ starter heat shield a ground wire was added @ trans. replacement aprox 1 year ago.somone grounded the loose stud to the heater core.I guess you can only get a ground from coolant for 1 year.thank you again Steve...	22
	1999 Chevrolet S10 LS 2.2L No Start VIN: 1GCCS194XX after pulling the front engine cover and finding that the timing marks line up, i moved on to the electrical side of things. had a good crank signal to the ignition module but when I scoped the signal wire from the ignition module to the pcm found that is was ...	25
	2004 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC12F44 After operating vent sol. several times(20)as suggested it finally did pass smoke. Thanks guys Trouble codes: P0442.	14
	2006 Chevrolet Silverado 3500 WT 6.0L ABS light on, no codes VIN: 1GBJC34U96 Thank You Everyone for responding. I already had tried "rebooting" by shorting the battery cables together, but not for ten minutes. I gave that a try, probably more like twenty minutes, no good. I drove the rig on my normal test drive route, 1.25 miles up to ...	8
	1994 Geo Prizm 1.6L Speedo VIN: 1Y1SK5363R Thanks for the help, fellows. A new used unit solved this problem. I wish there were someplace local that I could have taken the old speedo to have it checked but I don't know of any that exist. Again, thank you for setting me on the right path and confirming ...	3
	1990 Oldsmobile Delta 88 Royale 3.8L No Start, Cuts out VIN: 1G3HN53C8L Thanks to all who replied.After exausting every suggestion to Fix this beast I called in a friend of mine. Wile going thru the live data capture on the car my friend noticed a dummy reading on the TPS just as it died.So he started banging the ECM and the read...	14
	2001 Pontiac Bonneville SE 3.8L Mechanical VIN: 1G2HX54K81 THANKS TO ALL WHO RESPONDED TO MESSAGE. WE REASSEMBLED ENGINE WITH NEW PCV STRAW AND VALVE, AND NOTICED NO CHANGE IN OIL CONSUMPTION. WE REMOVED FRONT VALVE COVER AGAIN, WE DID NOT SEE ANY ISSUE WITH NEW VALVE SEALS. WE USED SMOKE MACHINE TO FILL CRANKCASE. WE...	11
	2002 Pontiac Grand Am SE 3.4L No Start VIN: 1G2NF12E22 While testing #2-6 secondary ignition wires were removed to check for spark. When engine was cranked, engine started, the engine started every time after that and did not die again. We tryed to duplicate the problem for 2 days without success. We returned vehi...	17
	2003 Pontiac Sunfire SE 2.2L guages VIN: 3G2JB12F13 well this was the sinceya syndrom , sinceya fixed this some thing else is wrong !!! as most replies sugested check for power and ground to the dash , then replace it ... got a used dash from the wreckers put it in and wella every thing is fine just incorre...	8

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