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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 7, 2005
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1988 Buick Reatta 3.8L Signal Lights VIN: 1G4EC11C4J
Hey Techs, Have a Reatta that when you turn on the signal lights, the vehicle makes a single beep before they start to work. The vehicle does not seem to have a simple flasher for the signals,but seems to have "Turn signal Alert Module" which is probably very...
1993 Chevrolet C1500 Cheyenne 5.7L Hesitation, Misfire VIN: 2GCEC19K9P
I am looking for specifications for this vehicle. Being an import our scanners do not connect to the on board diagnostics. Can any one please inform me of fuel pressure & volume specs. The vehicle seems to be going lean under load. Spark system has been tested...
1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W2S
Ok this truck is killing me, One year ago a very good customer brought in this truck he just bought, for a great price according to him. We checked it out, a major safety inspection, everything looked ok. About a month later the truck came in on the hook, I c...
1996 Chevrolet K1500 Cheyenne 6.5L No Start, MIL Lamp on, no throttle response VIN: 1GCEK19S3T
I do transmissions and took this in because it is slow now and he said to begin with it started hard and thought he needed glow plugs. When he gets here he mentioned it won't revve up some times. Alittle more then I really wanted to get into. But it is here. S... Trouble codes: P0251, P0370, P0606, P0406
1996 Chevrolet Blazer 4.3L Knock Sensor VIN: 1GNDT13W4T
This Vehicle originally came in with a running problem. Customer complained that the vehicle would shut-off when the gas pedal was released and coasted or brought to a stop by using the brake. Fuel pressure was ok was within specs 54lbs. The vehicle was was ha...
2000 Chevrolet Suburban 1500 LT 5.3L Accumulator VIN: 3GNEC16TXY
Hello group, This Suburban came in with a seized A.C. compressor. Long story short, GM has redesigned the accumulator. This requires replacing the line that goes to the rear evaporator. The orginial accumulator is made by Delphi with these two seperate #'s 157...
2000 Chevrolet Venture 3.4L Transmission VIN: 1GNDX03E6Y
Hello Iatn members, I have a transmission problem which I hope someone can help me this one. The vehicle came in with no gear in D range and 3rd gear. Vehicle would not move in the these ranges. I have checked all the basic-ok. Transmission range switch-ok. ...
2002 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDS13S02
This truck came in with a check engine light on and code 1345 in the computer. It has no running problems that I have experienced but the customer says that it has poor performance at times. I commanded the cam phaser to 10% at about 1500 rpms and it goes righ... Trouble codes: P1345
2002 Chevrolet yukon 6.0L blows fuse VIN: 1GKFK66U12
truck was towed in to a shop a week ago with a blown ecm fuse the shop installed a new fuse and sent customer on his way. truck was towed to me with the fuse blown we replaced the fuse and did some test the fuse run the pcm and fuel pump relay power pump test ...
1999 GMC Jimmy SL 4.3L 4 low VIN: 1GKDT13W0X
Where is the transfer case control module??? -customer came in for lack of power -we found fault code P1875 indicating problem with 4low switch -scan data shows 4 low at all times -this caused computer to have erratic shifting and no power -no codes in tccm - ...
2003 GMC Sierra 2500 SLE 6.0L axle seals VIN: 1GTHC29U33
Have slight rear axle seal leak both sides, vent hose seems unusually long and small. Are we barking up the wrong tree here, are they known for seal troubles? This truck well kept run easy, two wheel drive floating axle.
1990 Oldsmobile Delta 88 Royale 3.8L No Start VIN: 1G3HY54C9L
this one has me puzzled so here goes...occasionally this one wont start - it cranks fine, has good fuel pressure and great spark but the computer sometimes wont trigger the injection. It happens when it is stone cold or when hot - temp doesnt seem to matter. T...
1998 Oldsmobile 88 Royale 3.8L Cooling Systems VIN: 1G3HN52K7W
Hi Techs! This Eighty-eight came in on a hook after dying. Vehicle started right up, but hydrolocked after we shut it down. We replaced the upper plenum and lower intake manifold gaskets to correct the coolant loss. Replaced the radiator cap. Now vehicle will ...
1985 Pontiac Firebird 2.8L Excessive Emissions, Poor Idle Quality VIN: 1G2FS87S2F
it seems these old gm's are the worst for me, i have been on this car almost all day and not much closer. i need some help hard to start, will not idle. if you floor this car it will start and rev up just fine sounded to me like way to rich. scanned and got t... Trouble codes: 34 (maf sensor or circuit too low)
1991 Pontiac Bonneville SE 3.8L interior door lights VIN: 1G24X53L5N
Have this 91 Pontiac boneville with a battery draw. We replaced the power window motor due to being inop. Before we put the door panel on I cked the function of door lock latch, seems to work fine and door lights come on and off with the delay. But somtimes th...
1994 Pontiac Trans Sport 3.8L MIL Lamp on VIN: 1GMDU06L9P
This car came in to the shop with the customer complaining of a check engine light on and no drivability concern. When the brick was put on it, it came up with 101. Mass airflow failure. I printed out a flow chart for this code which hadme check the A B and C ... Trouble codes: 101 (Mass airflow failure)
1997 Pontiac Bonneville SE 3.8L exterior lighting VIN: 1G2HX52K8V
problem with this car is the headlights,parking lights and the dash lights all flash like a strobe when turned on automatic through the ambient light sensor when it gets dark enough or cover it up. every thing works normally if the headlights are turned on man...
1997 Pontiac Sunfire SE 2.2L engine VIN: 1G2JB5241V
hello,have a strange one here this car was towed to shop timing chain broke about a month ago customer can just now afford to get fixed. replaced timing chain and had cylinder head reconditioned with new valves and complete valve job. reassemble and now engine...
2000 Pontiac Grand Am SE 2.4L Daytime running lights VIN: 1G2NF52T8Y
Please help, this car came in with the customer complaining of no ac and that the lights came on in the middle of the nite and couldnt be shut off. The ac is fixed but im pulling my hair out trying to figure out the lights. The body computer had a B2602 code(D...
2002 Pontiac Grand Prix SE 3.1L Hesitation, Poor Fuel Economy, NO POWER VIN: 1G2WK52J92
this vehicle has no codes, long term fuel trim is -30.00 o2 sensors seem to support this, one thing we found is that baro sensor reads 14 psi koeo,replaced map sensor no change, once engine starts map sensor seems to read normal,two weeks ago another shop repl...

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick LeSabre Limited 3.8L Surge, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G4HR52L3R
Replacing the Pcm fixed this Buick. The traction light is off now, both computer codes stay away & car runs great! - Thank for all the help! Trouble codes: P0341, P0342.
1994 Cadillac Seville STS 4.6L head bolt serts VIN: 1G6KY529XR
was able to replace time sert to a lower position in the block. The head bolts were threding all the way to the end of the sert. replaced gasket and head botls.
2001 Cadillac DeVille 4.6L Electronic VIN: 1G6KD54YA1
I got seven replies and 5 said LOW CHARGE, Well i feel a little silly for having to open a help request because the charge was low, but that is what i did. Yesterday when i hooked up the ac machine the pressues were good so i did nt think low charge. It was on...
1987 Chevrolet Caprice 5.0L Alternator VIN: 1G1BN81Y9H
Thanks to most all who replied. Sometimes we overlook the simple things. A lot of people told me that it was o.k. to have the regulator red wire hooked to the output terminal, so I checked the output wire to the battery and found it to be the problem. No outwo...
1993 Chevrolet C1500 Cheyenne 4.3L Misfire VIN: 1GCDC14Z0P
well...just as i suspected, it was lean. The injectors were the culprits. I decided to run a motorvac on this one, because all of the odd drivability cases i've had, seemed to improve with one of these services. This one did in fact improve, and that was enoug...
1999 Chevrolet C1500 Suburban 5.7L starter VIN: 1GNEC16R6X
Thank you to all who replied. The problem ended up to be the code 1345. I reset the distributor to the proper place and the vehicle never exibited the drag at start up any more. I did follow through with all suggestions and found that all the voltage drops wer...
1999 Chevrolet Silverado 2500 6.0L cycling switch VIN: 1GCGK29U2X
as per the replies we replaced the pigtail and cycling switch. this cured the problem. vehicle has been on the road for2 weeks now and customer says all is fine.
1999 Chevrolet K1500 Suburban 5.7L trasfercase VIN: 3GNFK16RXX
thanks members this vehicle is fixed,vehicles wiring harness was corroded tan wire to encoder just before connector under master cylinder also green wire on rt.speed sensor used for tranfercase output rpm this was broken at sensor connector.I used voltage sour...
2000 Chevrolet Malibu LS 3.1L dash gauges and lights go dead VIN: 1G1NE52J0Y
sorry, but this one ended up at the dealer. i drove this car everyday for a week and it would not act up and then the next day i couldn't get it out of the shop. the problem was so intermittent that i could never catch it when it happened...whatever it was. i ...
2002 Chevrolet Impala 3.4L starter VIN: 2G1WF55EX2
ended up towing to steeler ship body control module was problem
2005 Chevrolet Silverado 1500 4.8L Hesitation, Surge, Misfire VIN: 2GCEC19V75
Hi fellow techs, I am closing this post belatedly because I have not been able to verify the complaint,and the owner wants Chevy to fix it.I don't see a problem other than a need for more torque.Maybe my friend should have bought a truck with a larger engine...
1997 Pontiac Grand Am SE 2.4L engine VIN: 1G2NE52T9V
it turns out this is particular engine has to have the rotators on the intake valves,which is pretty unusual,since most other engines have them on the exhaust.i guess the machine shop could be blamed,but the norm is that they are on the exhaust valves.the loca...
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