GM Automotive Technicians Technical Discussion and Fixes for Feb 12, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick LeSabre Custom 3.8L spark Knock VIN: 1G4HR5215R I could use some help on a spark knock problem. The customer brought in for poor fuel economy. I replaced the Thermostat. The engine ran too cold also replace the o2 while I was at it. On road test I noticed to much spark Knock for normal operation when under ...	View
	2000 Buick Park Avenue 3.8L Interior VIN: 1G4CW52K8Y I would like a spec. on parstic battery drain for this vehicle.Any and all help is apperiated.Thanks	View
	1994 Cadillac Seville SLS 4.6L Mechanical VIN: 1G6KS52YOR Hello! I am replacing MAP sensor for the second time on this Caddy.The MAP sensor is bathed in oil, as was the first time. Is this normal to have oil in this area? If not,what is leaking? I am thinking this is what's causing the premature failure.Thank-you.	View
	1994 Cadillac DeVille Concours 4.6L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G6KF52Y0R now coolant temp goes from 172f to 50F real fast,abs data states Lf and Lr wheels going 40mph and the rest of the data is jumbled on our snap on scanner and sometimes just cuts out for lack of communication.unplugged computors on the uart data line one at time... Trouble codes: 137 (loss of abs/tcs data)	View
	1998 Cadillac Seville STS 4.6L Starting VIN: 1G6KY5492W First Seville in our shop.Imported from Singapore. Used car from dealer client. Vehicle driven for 3 days by yard manager without problem. Came in for oil service, no problems. Sat in shop overnight. Attempted to start vehicle this morning, dead flat battery. ...	View
	1997 Chevrolet Venture 3.4L Mechanical VIN: 1GEDTRE4WV Hello all GM techs, I have a question. We dont do too many american vehicles so here it goes. This van came it with number 2 cylinder filled with antifreeze, so we removed the intake manifold and did head gaskets. One of my techs put it back together tried to ...	View
	1998 Chevrolet K3500 Cheyenne 5.7L Electronic VIN: 1GCHK33RVW Hi techs: We have a chev pick-up that came in with the 4x4 not working. What happens is when you put it in 4x4 it does not engage unless you turn the ignition off and then on again. But with the vehicle running and you pull the stick into 2 high and back into ...	View
	2002 Chevrolet Silverado 2500 6.0L starter VIN: 1GCHK24U62 see below	View
	1992 GMC C1500 Sierra SLE 5.0L Poor Idle Quality, Stall, stumble VIN: 2GTEC19H8N hi everyone. thanks in advance for all your help i hope to receive. this truck came in after the dealer did intake manifold gaskets to repair a water leak. the customer went to get it and it died leaving ther service bay. dealer said it must have been doing th...	View
	1999 GMC Sierra 1500 SL 5.3L abs VIN: 1GTEK19T5X Dear fellow G M Techs,I have this GMC pickup (4x4) that activates the ABS when you come to a stop ,it has gotten more frequent now,I monitored the wheel speeds with my snap-on scanner,all the speeds appear to drop down evenly when this happens,I evev had someo...	View
	2000 Oldsmobile Intrigue GL 3.5L cooling 2000 intrigue , 3.5 liter . Over heats when under freeway conditions, will run all day in bay with radiator covered, normal temp, normal fan op,ect reads correctly,matches guage,matches infared temp gun.no combustion gases in cooling sys. I drove @ 85 mph apro...	View
	1995 Saturn SL1 1.9L Excessive Emissions, Poor Idle Quality, Misfire, NOISY VALVETRAIN VIN: 1G8ZH5289S I am the fourth shop that has had this vehicle. I am primarilay an engine remanufacturer and have limited diagnostic capabilities relating to emissions related problems. This vehicle starts and runs fine when cold. As it warms to operating temperature, it idle...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1989 Buick Reatta 3.8L ABS Module + Master Cylinder VIN: 1G4EC11C7K Gentlemen, All of you emphatically said don't even attempt this for liability reasons! I will follow everyone's advise and inform my customer of this decision in the morning. Thanks for your wise counsel!	11
	1994 Buick LeSabre Custom 3.8L drive and reverse VIN: 1G4HP52L1R Thanks to all who replied, response was unanimous that problem was most likely input clutch seals or convertor drainback due to faulty check valve. Convertor drainback did not appear to be the problem as fluid level was not excessively overfull before starting...	15
	1990 Chevrolet Lumina APV 3.1L battery VIN: 1GNCU0603L after removing the radio from the vehicle the draw went away.	13
	1990 Chevrolet G20 Sportvan 5.7L engine VIN: 1GBEG25K0L Greetings: Well, we got several replies stating what we already knew, but thanks for the confirmation. Fix it right or replace the engine. After completing plastigage checks on the remaining bearings and finding #2 out of spec and #1 didn't even flatten the ...	13
	1992 Chevrolet S10 Blazer Sport 4.3L hard start VIN: 1GNDT13W4N Thank you for your help. I was stuck on the pulse width being the problem when it wasn't. There was a pinhole in the feeder line to the cpi assembly under the intake. Most of you pointed me in that direction.	7
	1994 Chevrolet S10 Blazer Tahoe 4.3L oil consumption VIN: 1GNDT13W1R thanks to everyone for your info. after talking to the cust,we decided to install a new engine.	11
	1997 Chevrolet Blazer 4.3L Misfire VIN: 1GNDT13W5V Dropped catalytic converter found it was melted inside, replaced it and truck was fine. thanks to all who responded!!	17
	1999 Chevrolet Silverado 1500 4.8L blend door motor seems like this is a common problem with this truck, I replaced the blend door motor and everything is working fine. thanks to all those that helped . a simple fix.	4
	1999 Chevrolet Express 2500 5.7L No Start The problem ended up being a bad ignition coil, cap, rotor and wires. The spark was back feeding through the ignition coil into the computer and shorting it out. This one was a strange one, but ended up being something simple.	7
	2001 Chevrolet Monte Carlo SS 3.8L Unknown VIN: 2G1WX15K11 The customer has not brought the vehicle back yet but we have agreeded to look at the alinement even thought the dealer had just alined. I received replies that recommended the following: 3 for alinement, 3 for struts (mounts, performance), 4 for tires (2 diff...	12
	1995 Pontiac Grand Prix GT 3.4L Timing belt VIN: 1G2WJ52X9S Most replies pointed to problems with the idler pulleys which already had been replaced but I forgot to post. Delco help lines tell us that replacing gears should help, otherwise don't worry because it is a common problem.	6
	1997 Pontiac Bonneville SE 3.8L No Start VIN: 1G2HX52K4V thanks for all your replies, this one was a little tricky to find, but extra thanks to Wayne [...], who all suggested a damaged composite intake plenum deteriorated near the EGR tube outlet allowing coolant into the inta...	25
	2000 Pontiac Grand Am SE 3.4L Idle surging VIN: 1G2NF52EXY I did not fix this vehicle, the customer took the car to the dealer. They found the B1 S1 causeing the problem and they decided to reflash the computer program. But surging was caused by the o2 sensor. It had a new o2 sensor on it but it is bad. An oversight t... Trouble codes: P0131 (O2 sensor bank 1 sensor 1).	6

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