GM Automotive Technicians Technical Discussion and Fixes for Jul 21, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1990 Buick Century Custom 3.3L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G4AH54NL6 Customer complaint of "service eng. soon" light on, with intermittent stall and sometimes would start, sometimes wouldnt. Talking w/customer to try and troubleshoot some, found out speedo would drop off sometimes,too. Checked over, found ok plugs, clean air an...	View
	1994 Buick LeSabre Custom 3.8L Blower Motor VIN: 1GYHR5269R I removed the add on switch and wires(which had burned out at switch terminals) and traced ircuit to where add on had been spliced in. I found that at the fuse and relay box behind right kick panel wire had been cut out of box and a wire was run to add on swit...	View
	1995 Buick LeSabre Limited 3.8L injector pulse VIN: 1G4HR52L6S the vehicle will start and die intermitantly. Losing injector pulse, setting the two codes above. Will only die sometimes and we replaced the anti-theft module thinking it would fix it, but the problem still exists. 5V to module okay, frequency reading eratic ...	View
	1998 Buick Regal 25th Anniversary Edition 3.8L No Start VIN: 2G4WF5215W Fuel pump will energize for 2 seconds and vehicle will start,after about 2 seconds power will be lost to the fuel pump and it will stall. The fuel pressure will come right back up to about 60lbs. I tried a cranksensor, ignition module and ecm.Still does it.Any...	View
	1990 Cadillac Eldorado 4.5L Poor Idle Quality VIN: 1G6EL1333L customer called shop and said his cad was making wierd noises and wouldnt go so we towed to shop and the engine runs likes the timing is retarded or maybe a plugged exhaust so i took the cat converter off and the car still runs the same ,i checked timing it wa...	View
	1995 Cadillac DeVille 4.9L compressor VIN: 1G6KD52B4S The ac controller is seeing something that is keeping it from asking for the compressor to come on. I am not finding anything. My next step is to replace the ac contol head but that is part of the whole dash.	View
	1999 Cadillac Seville STS 4.6L long crank time VIN: 1G6KY549XX Please help!! This cadillac comes to us from Canada. It has an intermittant long crank time, and I know what you are all thinking - fuel pressure regulator - but here is the problem with that. When this vehicle acts up (which is about every 20 starts) there is...	View
	1994 Chevrolet G20 Sportvan 5.7L MIL Lamp on VIN: 1GBEG25K7R Vehicle has very long cranking times.Replaced relay, oil pressure switch and PCM, still get an immediate code 54.I have ohmed out the Drk. Green wire from the PCM to the relay and the wire checks out good. As I understand,there is supposed to be a 2 second 12 ... Trouble codes: 54 (Cicuit fault Fuel Pump relay)	View
	1995 Chevrolet Cavalier 2.2L starting VIN: 1G1JC1247S Originaly repaired a/c for cust. then starter(bad soleniod). then dome as per tsb in alldata. cust very happy. Now, car dies when A/C turned off, and will start but die untill A/C turned back ON. A/C on, car starts and runs fine. Very strange, but i'm aware of...	View
	1997 Chevrolet Tahoe LS 5.7L lo beams and high beams VIN: 1GNEK13R3V I have a 1997 chevy tahoe in with inop headlamps (lo beams and high beams) A month ago we replaced the headlamp switch and it fixed the problem. Now its back. Thea head ligths will work when just the daytime running lights are on, when you turn the switch to r...	View
	1998 Chevrolet Blazer 4.3L Transfer Case VIN: 1GNDT13W8W Hello, We have a customer that is complaining that this Blazer will intermittenly put itself into 4WD and it is hard to get it out when it happens. I have checked for TSB's in Mitchell and checked the archives in ITAN there are several old posts for this pro...	View
	1996 Oldsmobile Aurora 4.0L Hesitation, Surge VIN: 1G173R4L6W this car will run fine after the initial takeoff.but its when you come to astop and go to give it gas is when youll experience a sudden jerk.it almost feels like first gear is slipping.i thought it might be the trans but im coming up blank.all the other gears ...	View
	1994 Pontiac Grand Prix SE 3.1L Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1G2WJ52MXR While driving car it will intermittantly cutout not allways stalling, just like the motor will immediatly go from 2000 rpm to 100 and then come back. seems that it usually will happen more on a cold engine yet we have also had it happen warm. we have many test... Trouble codes: 28 (Transmission Pressure switch circuit), 13 (HO2S Error)	View
	1999 Saturn SL2 1.9L Misfire, MIL Lamp on VIN: 1G8ZJ5270X Hello Everyone: I truly hope that one of my techs has helped someone in the past with a truly baffling problem!! Because, this Saturn is going to send me to Mars, Venus, and back!!! Like an idiot, I took on a SIMPLE engine swap from a local used car dealer o... Trouble codes: P0300 (Random cylinder misfire), P0302 (Cylinder misfire 2), P0303 (Cylinder misfire 3)	View
	1999 Saturn SL2 1.9L 3 4 shift.& TCC VIN: 1G8ZK5271X I am a German car tech, this is my moms car so please be patient.It had extremely hard engagement of reverse.It also has code P0741 TCC stuck off. It feels like its leaving 3rd applied at the time it applies 4 th. No lock up can be felt. My Mastertech does not...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick Skylark Custom 2.3L Timing Chain VIN: 1G4NV15D35 I want to thank everyone who asnwered my message. I ended up relacing the tensioner and chain. I started it up and it was quiet even before oil pressure built up (I changed oil also). The thing that concerned me and lead me to ask for help was the fact that ...	8
	1988 Chevrolet S10 2.8L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1GCCT14R5J sorry for taking so long to get back. i double checked all grounds and also cleaned them up, but all were tight and looked good. alot of people said to pay attention to the injectors, i found that on was intermittenly being shorted out. changed injector and al...	10
	1998 Chevrolet Metro LSi 1.3L Hesitation, Cuts out, Misfire VIN: 2C1MR5229W Hi all. This metro is running fine. After doing all of my scope testing and checking connections at the computer I started the car up and it was fine. We just talked to customer today and the car is perfect. Not really sure what happened but we were leaning to...	4
	1998 Chevrolet Venture 3.4L Right Sliding Door VIN: 1GNDX03E0W We had two replies but nothing to help. we just sat down with wiring diagram and tried to trace every input. It turns out that the FORD dealer who installed the new jam contacts had all the wires turned around, and he swears it worked for awhile after - don't ...	2
	2000 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13WGY Thanks to all, Air pump was problem.New fuse and relay along with air pump. Thanks for your help. Joe Trouble codes: P0410, P0463.	7
	1997 Pontiac Grand Am SE 2.4L Hesitation, Cuts out VIN: 1G2NE12T9V as usual all the good guys in this group have hlped us solve another problem, and we learned a new way to diagnose cars in the future. we had two replies that said fuel volume and quit a few about checking the cat, so we tested the cat firsat and had less than...	8
	2000 Saturn LS1 2.2L water pump VIN: 1G8JU52F1Y Good afternoon, This Saturn is quiet again. The problem was the balance shaft timing chain had slipped down and that allowed the tensioner to expand out. This tensioner has a locking mechanism on it. Once it moves out, it will not retract. The unit must be r...	5

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