GM Automotive Technicians Technical Discussion and Fixes for Jun 3, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1988 Buick LeSabre Limited 3.8L Poor Idle Quality, MIL Lamp on VIN: 1G4HR54C5J vehicle came in with idle problem an eng light on found tps reading at 3.82 volts unplugged tps and voltge dropped to 0. replaced tps set to specs and cleared codes two days later vehicle returned with light on and tps codes back voltage high again, unplugged ... Trouble codes: 21 (high tps voltage), 22 (low tps voltage)	View
	1990 Buick LeSabre Limited 3.8L speedometer VIN: 1G4HR54C8L Greetings to all Im working on this buick which the speedometer is not working.I scoped the vss and got agood signal also looked at scan data and ecm is getting a vehicle speed reading.I removed the instrument cluster to scope my signal but i did not get a sig...	View
	1995 Buick Skylark Custom 2.3L engine temp. VIN: 1G4NV55D5S vehicle came in overheating at low speeds. cooling fans operating properly. replaced thermostat, still overheats. has good heat from heater. coolant level is full and holds pressure. noticed poor circulation at idle either thru small tube to resevior or thru r...	View
	2000 Buick LeSabre Custom 3.8L retained acces. The radio specifically goes on and off with the opening and closing of the trunk deck . Not only with car running but also turned off.Seems to be a retained acces. problem but also sometimes security light will come on.	View
	1989 Cadillac DeVille 4.5L ECC Display and Fuel Data VIN: 1G6CD5155K This vehicle came to me from a customer that just bought it from a note lot. He stated that he has driven it for about a week and all was fine. While driving down the street, the A/C cut off and there is no display in the ECC window or the Fuel Data window. T...	View
	1955 Chevrolet belair 327CID booster VIN: VC55006816 Thanks in advance. I have bought a 55 wagon and want to install a used power booster and master cylinder. I figured someone out there might be able to tell me what donor car works best. I know that there are units at Danchucks but I am trying to keep costs dow...	View
	1991 Chevrolet Corsica LT 2.2L No Start VIN: 1G1LT53G9M Hello, I have a 1991 chevrolet corsica with a 2.2l eng. The problem is a long time cranking before starting, between 20 to 40 seconds. The car came in with a bad starter. After replacing the starter we saw why the starter went out, the long cranking time. It h...	View
	1994 Chevrolet K1500 Cheyenne 5.7L Hesitation, Surge, Stall, Misfire, Backfire VIN: 1GCEK19K5R The customer has been fighting this problem for several months now and has thrown parts at it then came to me. He says it will backfire in the exhaust and TBI when towing a utility trailer up a small hill and powers out and starts slowing down. Release the ped...	View
	1994 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL54T4R mil light keeps coming on. sets a 32 code. flow chart takes us to an egr valve which we have replaced 3 times. we have checked the the passages, they are free. we have checked the wireing to the computer from the egr, thats ok. we have checked the powers and g... Trouble codes: 32 (egr flow)	View
	1999 Chevrolet Cavalier 2.2L Cooling Systems VIN: 1G1JC5240X The fan will come on at 150deg, 160deg, 190deg, or whenever it wants to and stay on till engine shutoff. Vehicle is running too cold, ecm sees right temp, but doesn't ground fan relay at proper temp or cut it out at proper temp. Since ecm sees for example this...	View
	1994 GMC Safari SLE 4.3L Front Brakes VIN: 1GKDM15Z5R Please have any of you seen this problem before. Vehicle pulls severely to the right when you apply the brakes,Light or Hard.ABS Has no codes. No Lights on. left front brake seems not to be getting very much fluid. When you crack the bleader screw on both side...	View
	1989 Oldsmobile Cutlass Ciera SL 3.3L Poor Idle Quality, Cuts out, Stall VIN: 2G3AM51N7K anybody who knows gm's 3.3L, please help. this vehicle came in with a stall issue. when it first came in I test drove the vehicle and was not able to varify the concern. So I thought it was a typical stall problem and performed a tap test on maf, ckp, and pcm....	View
	1993 Pontiac Bonneville SE 3.8L oil pressure VIN: 1G2HZ52L4P Hello Peoples This 93 Bonniville 3800 has low oil pressure when fully warmed up after changing the timing cover gasket due to a oil leak. The pressure is 60 psi cold but drops to 10 psi when warmed up. The customer said his pressure never droped below 40 befo...	View
	1995 Pontiac Trans Sport 3.8L Poor Idle Quality, Surge VIN: 1GMDU06L4S have been chasing problem for a while vehicle surges from time to time and occasionally stall other times runs and idles fine have been watching fuel trim and at warm idle ok 125 to 130 but when a load is put on alt such as blower motor on high or cooling fan ...	View
	2000 Pontiac Montana 3.4L ABS light comes on VIN: 1GMDX03E3Y Hello everyone.Car came in with ABS light on.When i try read codes with Snap-on mt2500-"no communication" (only on the ABS.Data of engine scanner reads good). Was checked power,ground - everything ok.I think problem is ABS module, but it's costs lot of money. ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick Park Avenue 3.8L Stall VIN: 1G4CW52K3S What a tremendous resource iatn is!!! Thanks to everybody for their help. Cleaning the MAF didn't help but a new MAF took care of the problem...thanks again...marv	8
	1998 Buick LeSabre Custom 3.8L engine VIN: 1G4HP52K4W I appreciate all of the replies to my help request. Some of the replies were more helpful than others. My customer was very satisfied with what I did for him, espcially after I told him I was going to ask for help from about a couple of thousand other techs. ...	10
	1992 Chevrolet Lumina 3.1L No Start VIN: 2G1WL54T1N We found the problem although the customer has elected not to repair the car, at least we know what is wrong. The main focus of the query was to see if anyone had encountered an intake leak causing low compression to a bank of cylinders and every response said...	10
	1998 Chevrolet Prizm 1.8L MIL Lamp on VIN: 1Y1SK5280W Clean those lines real good. Done several of these in the past on Toyotas (parts totally interchangeable on evap sys.)with great success. Replace canister assb.(root problem)and purge VSV, clean purge line. It turned out I didn't clean the lines well enough. S... Trouble codes: P0441.	2
	2002 Chevrolet Express 3500 5.7L Stall VIN: 1GBHG31R11 I ended up replacing the ign. switch and the crank sensor. What helped the most was cleaning the air induction and fuel system. Anyhow it runs like it should now. We'll give it back to the customer and let them put some miles on it. Thanks again.	3
	1991 Geo Storm 1.6L Poor Idle Quality, Cuts out VIN: J81RT2357M thank you guys your replies send me the right way i was chesing a ghost on this one i found wires that were worn with battery acid that fix the problem Trouble codes: 14 (c.t.s high temperature), 13 (oxygen sensor), 21 (t.p sensor signal voltage high), 23 (mat sensor low temperature undicated), 32 (e.g.r system fault), 51 (e.c.m prom error).	4
	1995 Pontiac Bonneville SE 3.8L Poor Idle Quality, Stall, MIL Lamp on, No excelleration VIN: 1G2HZ52K0S Thanks to all of you that responded to my help request. The majority of the replies stated that the fuel pump was most likely the problem. I tested pump presure and sure enough, only 11 PSI max. Replaced fuel pump and problem solved. Thanks again to all that r... Trouble codes: 171 (Lean condition), 131 (O2 sensor lean).	19

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