GM Automotive Technicians Technical Discussion and Fixes for May 18, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick LeSabre Custom 3.8L none VIN: 1G4HR5212R have been working on this for 3 weeks trying to figure it out.it will run(poorly) but will not charge.we took it to a chevy dealer to see if they could figure it out since they have newer euipment than we do.they said it was the instrument cluster.customer sai...	View
	2000 Buick Century Custom 3.1L fans VIN: 2G4WS52JXY his car will not turn on cooling fans with the AC on,so the result is no cold air.We tested the relays and they are fine,we did find that we had a wire going to relay #2 that is power,but by the diagrams it goes to the pcm and should be ground.The fans will co...	View
	2001 Buick Regal LS 3.8L starting VIN: 2GRWB55K81 hi, i had this 01 buick brought into shop for intermittant no start. when it acts up, all lights car will not crank, clicking in dash sounds like turn signals clicking, lights on instrument panel flash (abs, brake, service engine light) gear shifter will not c...	View
	1991 Cadillac Eldorado 4.9L System monitor VIN: 1G6EL13B2M Ok Caddy electrical Guy's, let me tell ya about this one, Intermittently displays "Check System" and you can not enter onboard diagnostics, then if I hook up a scan tool to the ALDL; you can then enter onboard diagnostic. many codes, IS THERE ONE THING THAT S...	View
	1994 Chevrolet Beretta Z26 3.1L Hesitation, Surge, Poor Fuel Economy, MIL Lamp on VIN: 1G1LW15M5R Hello all, we need some big time help with this one. We've had it for two months on and off with no avial. What happens is the vehicle jerks at cruising speed just like when the spark plug wires are bad, although less noticable then a dead misfire. When the Be... Trouble codes: 44 (Fuel system lean)	View
	2000 Chevrolet Impala 3.4L air bag VIN: 2G1WF55E8Y Hey fellow techs, I have a 2000 Impala with a SIR light on. The codes are B0041 and B1001. Both tests require the use of a special J tool, which I dont have. I have reasonably diagnosed a bad Module but would like some feedback to other possibles or probables....	View
	2001 Chevrolet Silverado 1500 5.3L reciprocating parts VIN: 2GCEK19T71 Thanks in advance- This truck is well maintained, regular oil changes. It make a noise that is similar to but not quite the same as, a rod knock. Like a rod knock the noise is worse at higher rpm w/ low engine load. But it doesn't quite sound like a rod knock...	View
	2001 Chevrolet Suburban 2500 8.1L temp, fuel and trans temp gauges VIN: 3GNGK26G31 Seems like this is in the ip but I've got some new stuff to me. There's 7v. occas. 8v. on the serial data circuit. Nice clean square wave form but... While the grounds are ok, some of the ref. low circuits at the pcm have 1/4v or even 2v. Both of the 2v lines...	View
	2002 Chevrolet Venture LS 3.4L no shift, ses light on VIN: 1GNDX03E82 Hello fellow techs. I have a vehicle here with an extreemly intermitant problem. The tcc fuse blows at around 140 miles aproximately. i have checked the harness connector for the TSB concerning simular problems. There appears to be no fault for extended period...	View
	2002 Chevrolet Silverado 1500 5.3L Stall VIN: 1GECK19T22 car came into shop car stalls at times but restarts every time it stalls out. also hes complaining when he gets into the truck to start the vech. he turns the key to start and truck wont start now when he trys it again after the second time it starts right up ...	View
	2003 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J23 car starts fine in morning car dose'nt start after sitting in sun for awhile has no codes or theft deterent problems fuel pressure good both crank signals good on lab scope when problem occurs I don't have injector pulse or spark any help would be appreciated ...	View
	1992 GMC K3500 Sierra SLE 6.5L overdrive VIN: 1GTHK34F4N no overdrive scanner readings of tps volts 1.76 ,tps angle% 35%, coolant temp reads -35 there all stuck there no movement what so ever.checked voltage at tps plug with volt meter reads like it should right ref, right output traced all the way to ecm same outpu...	View
	2001 GMC Yukon Denali 6.0L steering VIN: 1GKEK63U21 Vehicle setting at idle, turning the steering wheel left from a lock right position, the steering hangs up or gets hard and has to be powered through these hard spots. Am able to raise rpm up and problem goes away. My thoughts are a problem with the steering p...	View
	1996 Oldsmobile 98 Regency Elite 3.8L information center VIN: 1G3CX52K4T The tail lamp out message in the info center will not go out. All the bulbs are operative and have been replaced just in case of wattage problems. Anybody out there have a clue to this malady? There are of course no TSB on this particular problem. Thanx for al...	View
	1987 Pontiac Bonneville LE 3.8L Poor Idle Quality, Cuts out, Stall VIN: 1G2HZ5130H Vehicle has been thru 3 shops that cannot find the cause. It cuts out and or stalls just like turning the key off and on. Usually under load, but idle's and runs rough most of the time. Sometimes will stall idling in gear just like turned the key off. Has NO p...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Cadillac DeVille 4.9L Poor Idle Quality, Hesitation, Stall, Poor Fuel Economy, MIL Lamp on VIN: 1G6CD53B3M Thanks for all that responded, it's good to know that there's fellow tech's that are willing to help. The fix was replacing the ECM, it was seeing the inputs from the MAT, ECT, and TPS but not responding. Put new ECM in and vehicle is running smooth. Thanks Ri...	10
	1995 Chevrolet Monte Carlo LS 3.1L hvac fuse #15 VIN: 2G1WW12M3S thanks for everyones help on this problem.i have removed (temporarily)the daytime running light module and the short seems to have gone away.the customer will drive the car for some time and we will see what happens. thanks again	5
	2000 Chevrolet Express 1500 5.7L brakes VIN: 1GBFG15RXY Thanks for all the replys, The rear shoues were most ofthe problem with this one. The shoes were poorly made, they were twisted in a way that they wouldn't make good contac with the drum. We also replaced the front brakes and rotors again.	9
	2000 Chevrolet S10 2.2L Hesitation, Cuts out, MIL Lamp on VIN: 1GCCS144XY I appreciate the replys. I was not able to dupicate. I replaced the throttle position sensor and customer has been driving now for 1 1/2 weeks and has had no problems. Appears this has fixed customers concern. Trouble codes: P0122.	3
	2001 Chevrolet Silverado 1500 5.3L can't reprogram pcm VIN: 2GCEC19T11 thank you for the replies. i sent my genysis otc scanner in for repair and update. so far have not had problems.	7
	2002 Chevrolet Avalanche 1500 5.3L vibration VIN: 3GNEK13T22 Jack [...] was correct in his reply the evo sensor was bad the new design has 4 wires instead of 2 with limited data from the scanners snap on solus and the mac mentor we took the gamble and replaced the sensor problem solved thanks to all who replied	8
	1995 Oldsmobile 88 Royale LS 3.8L Cuts out, Stall VIN: 1G3HY52K6S thanks to all who responded. You just reinforced our feeling that either the PCM or Crankshaft position sensor were to blame. We changed both to be sure. Problem solved!	7
	1997 Pontiac Grand Am SE 2.4L Hesitation, Surge, MIL Lamp on VIN: 1G2NE12T7V well as i may have said in my original reques, all ignition parts module, plugs, boots and coils were replaced by the owner trying to fix this car prior to us seeing it. we just assumed that all parts wee working properly and after mul;tiple tests and hours of... Trouble codes: P0335, P0341.	5
	2002 Pontiac Grand Prix SE 3.1L No Start VIN: 1G2WK52J52 Thanks to all who replied. The vehicle finally refused to start completely. When this happened the mil light did not come on and the ecu would not communicate with the scanner. After checking power, grounds, and imputs we replaced the ecu and the car has not h...	5
	1998 Saturn SL1 1.9L MIL Lamp on VIN: 1G8ZH5289W i wish to thank all of you who responded.turns out i fixed the car by replacing 02 sensor.the problem with bank 1 sensor 1 reading 0 mv. was due to scan tool not displaying data. i have a brand new snap on solus which for some reason doesnt display sensor 1 da... Trouble codes: P0133.	10

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