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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for January 19, 2006
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Open Help Requests for GM
Help Request Answers
1968 Buick GS 5.0L Wiring VIN: 446678B120
Hey everybody out there in "mechanic land?" Need a little help from some "old school" techs out there or whomever can help. Here's the situation. Had a 68 Buick GS that was brought in for I don't know what, but for whatever reason, the tech had to pull the d...
1987 Buick Century Custom 2.5L engine VIN: 1G4AH51R5H
Engine is not getting oil to the rocker arms at the head .
1988 Cadillac Eldorado 4.5L Liquid Crystal Display VIN: 1G6EL1156J
This is My first post after years of Membership so please have pity. This is a real nice Cadilac Eldorado. Problem is Liquid Crystal display on Dash, Heater,& Information Center does not light up. Another shop tried another Body Computer. I checked all grounds...
1990 Cadillac DeVille 4.5L Speedometer VIN: 1G6CD5330L
This is my first post and hope it is in correct section. The customer returned and stated speedometer reads almost double and fuel mileage is inaccurate. We compared dash and modis readings and they are the same. We got a second ecm by application from salvage...
1992 Cadillac DeVille 4.9L MIL Lamp on VIN: 1G6CD53B6N
We are lost on this one.We have cleaned all grounds,added a jumper ground off ground at alt bolt and performed tsb on main ground.We have replaced ecm and park neutral switch but still get a service engine soon light and a code 91 after a very short drive.Any ... Trouble codes: 91 (park neutral switch concern)
1994 Cadillac DeVille Concours 4.6L failsafe VIN: 1G6KF52Y6R
car came in stuck in second gear, code 29. pulled pan , saw B solenoid was broken and hanging there at valve body. replaced both solenoids w/GM#[...], still same trouble. scanner shows solenoids changing as normal, but no shifts at all, after the solenoids ...
1998 Cadillac Seville STS 4.6L Interior lamps VIN: 1G6KY5496W
Hello We have the 98 STS with interior light problems. All four door lights and overhead reaing lights do not go off. We used Tech 2 and tested all door switches, all are functioning. Tested and clean G301 and other ground connection. Tested 3 main control rel...
1985 Chevrolet K20 Custom 5.7L timing VIN: 1GCCK24M3F
I just installed this motor in this truck set the motor at top dead center with the balancer at 0 degrees on the timing tab provided with the motor. I indexed the distributor to the number 1 cylinder and fired the motor up. I set the timing by ear and then che...
1991 Chevrolet Astro 4.3L Poor Idle Quality, Hesitation, Dies at idle VIN: 1GBDM19Z1M
Vehicle came in with erratic idle & dies at idle. Found system running lean. block learn 138 , integrator 128 - o2 tests ok . Tps reading was 11% . All-Data said tps reading at idle should be zero.I replaced TPS for this & new one reads 12% so I am assuming th... Trouble codes: 33 (map sensor history code)
1992 Chevrolet Caprice 5.7L Stall VIN: 1G1BL8370N
This Caprice will stall ONLY when making left turns at about 20-30 MPH. We have never experienced the problem, but it happens at least once a week for our customer. We replaced the distributor cap & rotor, wires, plugs as maintenance. We have also replaced the...
1992 Chevrolet S10 Blazer Sport 4.3L Rear Brakes VIN: 1GNDT13W0N
I searched and found some information that was helpful, but have not nailed this one yet. We have been trying to fix the rear brakes for a long while. There are virtually no rear brakes. They are working very slightly, as I can see where the new shoes have be...
1995 Chevrolet K2500 Cheyenne 5.7L Hesitation, Stall VIN: 1GCGK29K4S
Good evening GM techs.I have a truck here that is driving me crazy.It is hard to start unless I spray carb cleaner down the throttle body.Once it starts It runs poorly,The IAC opens to approx 100,the map sensor voltage starts to climb,all because it is running...
1995 Chevrolet K1500 Cheyenne 5.7L Excessive Emissions, Hesitation VIN: 1GCEK19K3S
Hi guys, need your help again. The vehicle will fall on its face under hard accelleration. Kind of acts like a bad accellerator pump on carbureted vehicle. If you feather the throttle to 2000 RPM it will then takeoff and run decent. Seems to idle ok just dead ...
1996 Chevrolet Cavalier 2.2L abs VIN: 1G1JC5249T
I am a Nissan Tech working on my sisters Cavalier that has a ABS lamp on intermitantly. I drove it for about 10 miles with no lamp on and brakes feel fine. I checked for codes and found codes 14,57,62,65,76 and 78 stored in history with code 78 as the last set...
1999 Chevrolet Express 2500 5.7L Water Pump VIN: 1GTHG35R5X
The water pump was replaced in this van 2 weeks ago. It came back with a severe coolant leak. Turns out the technician left the bolts loose...so we thought. (There was no sign of gasket remaining by the way) So the van got a new Delco water pump and obviously ...
2002 Chevrolet Monte Carlo SS 3.8L programing VIN: 2G1WX15K72
This customer brought the vehicle to us for a no start and other interior features not working 6 months ago. We installed a BCM and corrected the problem. Earlier this week the customer stopped by with a low tire and a yellow low tire indicator light on. I fil...
1997 Geo Tracker 1.6L fuse VIN: 2NCB1867V6
This Tracker has been blowing the Turn signal/reverse light fuse every month for a while, now it is blowing it every week. Owner says that it blows when driving, as in it works then doesn't work in the same drive cycle. I have inspected the harness at every a...
1999 Oldsmobile Intrigue GL 3.5L Misfire, MIL Lamp on VIN: 1G3WS52H8X
after repairs are made during roadtest some misfires are recorded on tech 2 more on coil pack side with problem , but don't set codes, fuel trim does't make any larger correction than maybe 5 percent,we know that the ecm controls all coils , has anyone else ra... Trouble codes: P0300
2001 Pontiac Grand Am SE 3.4L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1G2NF12E41
Got this 2001 Pontiac Grand Am in for a no heat problem. Checked it out and found that the system was low and found lower intake leaking. Replaced the gaskets and flushed the system. Vehicle started surging and cutting out. Went through and Checked all sensors...
1996 Saturn SL2 1.9L application VIN: 1G8ZJ5273T
Good Morning,I dont want to take up your time this morning but i cannot determine the model of the Saturns that i get into the shop.I have had trouble identifing the models.I cannot get any information from the Dealership on how to determine the correct model ...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Cadillac DeVille 4.5L No Start VIN: 1G6CD5159J
Well..I have not been able to repair this vehicle. After receiving a couple of replies I did remember that I had checked the grounds on a previous trip to the shop. I beleive the ECM may be the culprit but am not sure it will fix the whole problem. The DIC and...
1994 Chevrolet Camaro 3.4L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 2G1FP22S1R
Thank you all for your responses. I did find three leaking injectors. LTFueltrim and STfueltrim was 128 and did not change. [...] were high. I pulled the computer and had it reflashed. The computer failed. I replaced with a used computer and found a bad s...
1994 Chevrolet Blazer 6.5L No Start VIN: 1GNEK18S2R
This truck is runing again and out of my life. I had a few replies about the problems with the fuel driver on the side of the injuction pump. Haveing read the fix data base and not seing the same symptoms that I was haveing, did not want to just toss one on to...
1996 Chevrolet Beretta 2.2L Poor Idle Quality, Stall, Misfire, MIL Lamp on VIN: 1G1LV1542T
thanks everybody for the help almost all of the replys were in the areas already covered, it was a self(customer)inflicted wound replaced all 4 injectors with delco,s found 0s2 sensor working but extreamly fouled from injector flow problems thanks again all ... Trouble codes: 300 (randam missfire).
1998 Chevrolet Corvette 5.7L column lock VIN: 1G1YY32G1W
I couldnt find the 'close button!' As in my first reply, I found the problem and removed the campaign installed harness/relay. THanks!
1999 Chevrolet Astro 4.3L Poor Idle Quality, Surge, MIL Lamp on VIN: 1GCDM19WOX
Thank you gentlemen for your advise on this vehicle.I did further research and decided to replace crank sensor (cya) and replaced the distributor with another distributor. Just pulled old distributor out and reinstalled new distributor without moving any gears... Trouble codes: P1870 (trans slippage), P0420, P1345 (cmp/ckp syncronation problem).
2000 Chevrolet Blazer LS 4.3L 4 wheel drive VIN: 1GNCT18W0Y
Had code pulled, co323 transfer case lock circuit low.Followed chart for co323 code and found orange wire that goes into encoder motor broken and corroded.The chart says the resistance across the lock cicuit of the encoder motor should be 19-25 ohms it was 3.5...
1999 GMC K1500 Sierra SL 5.7L starter VIN: 2GTFK19T7X
thanks for the replys, unfortuntly the items suggested had been previously pursued to no avail. we have replaced the complete instrument cluster re: if battery went dead, digital odometer reset to a previous set mileage & not known last mileage. suspecting som...
2002 Oldsmobile Bravada 4.2L Transfer Case VIN: 1GH0T13S62
Thanks for the replies on this truck. I found that my Genisys system as well as Snap On will not cimmunicate with the TCCM module. I am attending a seminar on the Genisys sytem this evening, man do I have questions about this. After replacing the TCCM I found ...
1991 Pontiac Bonneville SE 3.8L No Start VIN: 1G2HZ51CM1
thank you to all. Te specs sent confirmed the idea of a failed crank sensor, I also discovered a failed fuel pressure regulator which was causing the extended cranking time
1999 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NE52T6X
well this car is out of here-thanx for all the great leads-david [...]-and mechnx hit it on the nose-they all said to check the housing the coils set in and sure enough- i saw tiny cracks in the material-just enough to cause arcing- than...
2003 Pontiac Grand Prix GT 3.8L Stall VIN: 1G2WP52K63
the owner decided not to spend the money to try any suggested parts. He had already put a new cheap module on himself. I suggested he get a oem module and if that didn't work then try a crank sensor since these are the most common failers.
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