GM Automotive Technicians Technical Discussion and Fixes for May 26, 2005

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Open Help Requests for GM

	Help Request	Answers
	1991 Buick Regal 3.8L battery VIN: 2G4WB11L9M HI Guys looking for some help here with a battery drain that has come up after installing a c/d player . seems that I now have a battery drain to 0 volt stage after sitting for 1 day. the drain is a 9.8 volt and 8 amp drain. I've been able to get the drain v...	View
	1992 Buick Regal Limited 3.8L speedometer VIN: 2G4WD54L8N hi first time poster here. this 92 regal with the 3.8 came to us with an inop speedometer, tach and odometer. we replaced the speed sensor and now the odometer works, the speedometer and odometer are pegged and works backwards with no consistancy. the new spee...	View
	1993 Buick LeSabre Custom 3.8L motormount Trying to change this waterpump, and the motormount is in the way blocking 2 bolts to the waterpump, removed all bolts and nuts from the motormount and I have a long stud holding this motormount in place. My question is what is the best way to remove this stud...	View
	1998 Cadillac DeVille 4.6L compressor VIN: 1G6KD54Y9W vehicle came in with ac system inop. replaced comp. a/c system then started working but, when you turn it on when it cycles it takes about five minutes to actually turn back on. no bcm codes also check all other systems in vehicle no codes at all.	View
	1998 Cadillac DeVille 4.6L Battery VIN: 1G6KD54Y6W Another Cadillac battery draw issue - will drain battery dead over the course of approx. 3 days - when we unplug the BODY 3 fuse in the under hood maxi fuse panel, the draw will go away - we get the same results if we unplug the body computer in the trunk area...	View
	1998 Cadillac Eldorado ETC 4.6L rr brake light VIN: 1G6ET1297W have checked circut from switch to module lr trunk power in no power ot to the rr brake light, any help would be appreciated.	View
	1992 Chevrolet S10 Blazer Sport 4.3L Low power VIN: 1GNDT13Z1N Got in a 92 S-10 Blazer the other day, with a complaint of Low power. Watching scan data shows the Knock PID switches to 'YES' as soon as the engine is started. No audible noise is heard at idle. Repalced the Knock sensor with an OE unit with no change. Discon...	View
	1994 Chevrolet K2500 5.7L radiator VIN: 1HCFK29K5R We have a radiator eating chevy in our shop. This vehicle has been back to us 5 different times for coolant leaks- all were radiator failures (area of left tank cracked. This vehicle originally came to us from a body shop where it had frt end damage. We repl...	View
	1996 Chevrolet Blazer 4.3L abs light on VIN: 1GNDT13WUT HELLO FELLOW TECHS, I'm dealing with a ABS code c1265. Flow chart diagnostics come down to replace VCM.Tryed that, same problem.Checked all related circuits for continuity & grounds .Then replaced BPMV(with junkyard peice).Same problem.Code resets on test driv...	View
	1997 Chevrolet Express 1500 5.0L MIL Lamp on VIN: 1GBFG15M2V Thanks in advance,I have a wierd one, failed obd 2 em. This is setting a po430 and passing a 420. Strange thing is it is a one cat system. The van has 4 o2 and the only post cat is sensor b1s3. Yes it is aftermarket cat ( second one )but the the rear o2 is dea... Trouble codes: P0430	View
	1998 Chevrolet C1500 Cheyenne 5.7L brake pedal VIN: 1GCEC19R0W (FOUR WHEEL ABS)truck came in for soft pedal.frt. brakes were worn out ,so did brake job, rears good and adjustment good,pedal feel did not change. checked out arcives and mremoved rubber plugs from abs unit incerted a paper clip to check for bad accumulators-...	View
	1998 Chevrolet S10 LS 4.3L No Start VIN: 1GCCS19X2W code p1626 diagnosisis suggested replacement of lock cylinder and passlock sensor. performed subsequent passlock relearn. security light comes on foe few seconds, goes off for few seconds, comes back on and remains on for duration of 10 minute period. truck st... Trouble codes: P1626 (passlock sensor not recognized)	View
	1999 Chevrolet Lumina 3.1L Hesitation, Misfire, MIL Lamp on VIN: 2G1W152M7X At idle the MIL light will turn off. Miss History with scan tool: - Cyl #4 – 4747 & # 5 – 4. Freeze Frame - Load - 23% / Coolant temp - 95 C / Map (kpa) - 88 / VSS - 44 Miles / MAF - 34.85 gm/sec / TPS - 29% Appreciate any help on this one. Thanks Trouble codes: P0300, P1381 (Misfire detected - no ebcm / pcm serial data)	View
	2000 Chevrolet Suburban 1500 LT 5.3L fuse IGN C VIN: 3GNEC16T9Y Complaint is repeated failure, apparently at random, of this fuse. "NoData"s schematic not much help; sub-fuses never blow. Can't duplicate condition on road or in shop, pulling/pushing/poking/wiggling/swearing. No tsb's, apparently, Is an internal short in th...	View
	2000 Chevrolet Silverado 1500 4.8L Cooling Systems VIN: 2GCEK19T9Y Hi all, this customer called and said that he had left the drain plug out of the engine overnight and the next morning, antifreeze was dripping out of the oilpan drain hole. Has anyone seen cases of coolant in the oil in these newer style engines, and what has...	View
	2001 Chevrolet Tahoe 5.3L Stall VIN: 1GIJEC13TE This thing will just shut down while idling in stall seems like it is losing power to ignition switch. just got it to act up it will start right back up. no codes any help would be appreciated no security light on or codes Trouble codes: 1416A	View
	2001 Chevrolet Venture LS 3.4L drivers side impact air bag VIN: 1GNDU23E12 Drivers side impact air bag deployed (mounted in back of drivers seat. unit deployed while comming to a routine stop light city traffic. No related repair history other that a complaint of had to boost in AM about 1 month ago, replaced battery at that time ...	View
	2003 Chevrolet Malibu 3.1L guages VIN: 1G1ND52J83 vehicle complaint was delay on startup when hot only and all windows,guages,radio interior lights etc inoperative.When i test drove vehicle parked it shut it off and then tried to restart it vehicle started up ran fine,but all guages radio a/c system etc was n...	View
	2004 Chevrolet Avalanche 1500 Z66 5.3L fuel tank VIN: 3GNEK12T24 Customer called us with the above complaint and explanation. We advised him we'd look into the situation and let him know what step to take next. It seems this should be a warranty issue, but customer has lost faith in the local dealer and wants us to advise ...	View
	1999 Oldsmobile 88 Royale 3.8L engine VIN: 1G3HN52K2X this car has a noies after it runs for awhile that would make you think a bearing is about to freeze up such as a water pump or alternator, but it isn't. I think it is related to the air induction somewhere. When you shut the engine off you can hear a vac suck...	View
	1993 Pontiac Sunbird LE Value Leader 2.0L Hesitation, Surge, Cuts out VIN: 3G2JC51H5P Hello Techs: This car came in with a request for a basic "tune up", and a note that there was a major bogging out on hard acceleration. Fuel filter was slightly restricted, so we changed that. All else checked out very good (plugs, wires, fuel pressure, air f...	View
	1999 Pontiac Grand Am SE 2.4L Poor Idle Quality VIN: 1G2NE52T5X Hello, This car came in with a check engine light on - p0300 Random Misfire. Installed scan tool, went to misfire information, intermitiant misfire on cylinder # four, only misfires at idle. Replaced all the numerous parts listed above. Removed timing chain c... Trouble codes: P0300	View
	2001 Saturn L200 2.2L Excessive Emissions VIN: 1G8JU52F61 Weve got this Saturn in here first time weve seen this car it has a code p0172 system rich bank 1 sensor one , it seems to not have alot of power and shtft is at -20% at idle and long term is -13% at idle the load is at 37% at idle, fuel trim cell is at 21 the... Trouble codes: P0172 (fuel system too rich bank1)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1988 Buick Century Custom 2.8L Poor Idle Quality, Surge, Stall VIN: 1G4AH81W5J First I would like to thank all of the members who replied with great advise! thanks Guys! I recived several replys telling me to enter the car in the scanner as an 89 model year instead of an 88 (the accual year) because of a prom update and MAF Delete. Which...	21
	1997 Buick Park Avenue Ultra 3.8L air vents VIN: 1G4CU5212V sorry for the delay...customer returned only yesterday... as suggested by several of you, the refrigerant charge was approximately 1/2 lb low...i wouldn't have believed it if i hadn't seen it myself many thanks to all who responded steve	13
	1991 Cadillac Eldorado 4.9L System monitor VIN: 1G6EL13B2M Wow, thank you for the great info!!! There was more than enough info to point me in the right direction, it was a bad Heater and A/C Programmer, all the wiring checked out and I found a used programmer that solved the weird symtoms this customer was concerned ...	7
	1999 Cadillac DeVille 4.6L engine VIN: 1G6KD54YOX thanks to all that emailed me very useful information. I recommended the customer to take car to dealer for repairs. Was able to have fixed for about $2500, customer is happy and drives his car daily. Again thanks.	15
	2001 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY54931 thanks to the replies of curt bob and gm tech the problem was the fuel tank pressure sensor giving false reading to computer telling it there was restriction when there wasnt, nothing in alldata trouble shooting said anything about this. takes the experience o... Trouble codes: P0446.	5
	2001 Chevrolet Monte Carlo SS 3.8L 1-2-3-Convertor Shift VIN: 2G1WX15K91 Thanks for all the replies. I still have not been able to resolve this issue. I went so far that I took it to a Chevrolet dealer who had it all day and they could not find the source of the problem. Once again thanks to all. I am still in search of the problem...	6
	2005 GMC Yukon 6.0L Reverse well I checked line pressure and it seemed low when first put into rev 60-90psi depending on temp and after 2-3 seconds it jumps to 120-150psi. If you give it too much throttle before the pressure rises it shudders. I removed the pan and rev boost valve, it lo...	5
	2001 Saturn SW2 1.9L Hesitation, Cuts out VIN: 1G8ZJ82721 HELLO EVERYONE. THE CAR IS FIXED AND PAID FOR. THANKS EVERYONE THAT RESPONDED. SEVERAL GUYS HAD IT RIGHT ON. HOW IS THE SAYING? iF YOU CAN'T FIND THE PROBLEM, GO BACK TO THE BASICS. IT WAS FOUND THAT THE IGNITION WIRES AT COIL #1 WERE BACKWARDS, AND THEREFORE ...	9

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