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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for February 7, 2006
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1995 Cadillac Seville SLS 4.6L a/c clutch VIN: 1G6KS52Y8S
Hey techs, This cadillac came in with the a/c clutch inoperative. I checked the relay to make sure it had power in all the right places and it did. I then scanned for codes and retrieved three dtc's. Number's 14 and 15 which the scanner said had low signal vo...
1989 Chevrolet C1500 Cheyenne 5.7L No Start, cranks VIN: 1GCDC14K7K
Helping a friend, he has installed a new g.m. engine, and it will crank over, but wont start. Have proper fuel psi, and power to and from coil. Injectors will not open, and no spark. And no ignition circuit signal from ecm. Initial test found that magnetic pic...
1990 Chevrolet K3500 Cheyenne 7.4L Poor Idle Quality, Hesitation, Stall VIN: 1GCGK34N4L
NEED HELP!!! OK. . . LONG story short, this vehicle has ALWAYS had a bit of a rough idle and sometimes would want to stumble/stall out. . .mostly when cold. Vehicle is a fleet use vehicle and we have put countless hours into this thing over the years in an ef...
1995 Chevrolet Lumina LS 3.4L MIL Lamp on VIN: 2G1WN52X4S
Hello All. I'm going to apologize in advance for a long post. This vehicle has got me severely stressed out. The check engine lamp intermittently turns on for the P1403 code. I have cleaned out the passage numerous times thinking just maybe I didn't get enou... Trouble codes: P1403 (EGR Solenoid 1 Circuit Error)
1995 Chevrolet Monte Carlo LS 3.1L temp gauge showed hot and heat indicator light cam VIN: 2G1WW12M6S
customer complaine dvehicle overheated . she was told that the cooling fans were the problem. they work fine for me [#1 comes on at 222 degrees snd #2 comes on at 235 degrees.the question i have has there been a bulletin concerning ecm temp senders [2 wire] be...
1996 Chevrolet Cavalier Z24 2.4L Poor Idle Quality, Poor Fuel Economy VIN: 3G1JF12T7T
Vechile came from another shop. customer was in collision and had new computer, flashed but jobber parts also ignition was done plugs and boots coil pac and ignition module. Also customer has had 4 o2 sensors installed and vehicle still not running right. Car ...
1998 Chevrolet Venture 3.4L MIL Lamp on VIN: 1GNDU06E9W
I need some dirction on this van. The problem started before about two months ago. The cam seized in this van and desroyed the engine. That was last summer. After letting the van sit for about 3 months cust asked to have a new engine installed. After that, cus... Trouble codes: P0133, P1133
1998 Chevrolet Cavalier LS 2.2L Warning Lights VIN: 1G1JF5245W
Hi guys, The customer came in complaining about some warning lights coming on in the dash. she mentioned the "ETS Off" light comes on at times, the "Security" light comes on, and also the "Temp" light comes on. I checked for the lights when I started it but...
1999 Chevrolet Silverado 1500 5.3L 4th gear VIN: 2GCEC19T4X
We have a 1999 Chevy C1500 Pickup with a 5.3L V8. History: Trans was rebuilt by other trans shop 8 months ago(13000 miles ago). Came to our shop with no 2nd or 4th. Trans had a burned band, Reverse input drum surface, & burned overrun clutches. We rebuilt the...
1999 Chevrolet Silverado 1500 5.3L unknown VIN: 1GCEK19T6X
Hello everyone and thanks for taking the time to read this. We had this truck in for a very low brake pedal and the ABS lamp was on. Found the master cylinder leaking fluid and replaced with a new one.When we went to bleed the brakes by commanding the pump on ...
1999 Chevrolet Venture 3.4L Cuts out, Stall VIN: 1GNDX03E3X
vehicle has intermittent hesitation and stall.no codes.took snap shot of serial data when problem occurs.problem usually occurs on accel and more so when cold.tps,map,maf stay steady when problem occurs.noticed 3x signal will jump from 3,000or so up to 5,000 a...
1999 Chevrolet Express 3500 6.5L Stall, hard start VIN: 1GBHG31FOX
I am working o a school bus. The complaint is that the bus will somtimes die on route. It has always restart after a minute. I have spewnt several hours with the bus and can never get it to act up while I have the bus. the last time it took it almost two weeks... Trouble codes: P1216
2000 Chevrolet C3500 5.7L Poor Idle Quality, Misfire VIN: 1GCGC33R5Y
2002 Chevrolet Silverado 2500 HD 6.0L Fuel Level VIN: 1GBJC34U02
The problem is that the fuel gauge is inaccurate and the front tank will run out of fuel without any fuel transfer from the rear tank. Our other shop put both sending units in it and using the Mastertech I can make the gauge work fine. Both of my fuel sender v...
2004 Chevrolet Silverado 1500 5.3L driver information center VIN: 2GTEC19T93
Hi gang-We just replaced this IPC (rebuilt unit) and noticed that now the Driver Information Center does not function. When you first start it the message center gives odometer reading and also shows 'Driver 2' then 'Change Engine Oil' but none of the steering...
2002 GMC Sierra 1500 SL 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GTEK14T12
I have multiple random cylinder missfires occuring mostly when cold. Fuel pressure is 48psi with koer,53psi with koeo, and 58 psi koer with vac line removed from regulator. My spec shows that fuel pressure needs to be 56-62 but does not state with koer, koeo, ... Trouble codes: P0300
1996 Oldsmobile Achieva SC 2.4L Excessive Emissions, Misfire, Poor Fuel Economy VIN: 1G3NL12T1T
After initial repairs car seemed to run great. Yesterday customer returned and said car is acting up again. We test drove and 1 time had car seem to missfire or stumble between 30-40 mph. Customer stated that once there up to speed, say 50 on up no problems ar...
1995 Pontiac Bonneville SE 3.8L MIL Lamp on VIN: 1G2HX52K4S
There is no communication with the pcm and the check engine light is on all the time. I can communicate with the abs module, but not the air bag unless the computer is unplugged. We have gone through the no communication test from mitchell and it says to repla...
1998 Pontiac Sunfire SE 2.2L Hesitation, Surge, Misfire, MIL Lamp on VIN: 3G2JB524XW
In good weather car runs great no mil light but when get a bit damp starts to act up and mil on when warms up / drys out, mil off runs great again if any one has see this problem like to know please could save me a lot a time , as car will be coming in Friday ... Trouble codes: P0122, P0404 (EGR Solenoid performance problem), P1404 (undocumented code)
1999 Pontiac Grand Prix SE 3.1L Cold engagement VIN: 1G2WJ52M6X
This is a relatively low mileage 4T60-E. Vehicle will not engage forward or reverse when cold. No codes. Line pressures are in spec. (see above) and are the same whether trans will move or not. Fluid level is ok and fluid looks and smells good. Filter and flui...
1999 Pontiac Grand Am GT 3.4L Poor Idle Quality VIN: 1G2NW12E3X
I have this grand am here that is driving me nuts. It came in last week for the cel being on. Code po172 was stored. I replaced the intake gaskets because the there was vacuum in the crank case. Car comes back today with a complaint of a rolling idle only when...
2001 Saturn SL2 1.9L Poor Idle Quality VIN: 1G8ZK5279Z
i have this saturn that on start up idles fine and fuel trims are good. but as soon as you start driving the vehicle the computer will just open the idle control motor to about 90 steps then my short term fuel trim goes to -12 and the car idles at about 3000 r...

Fixes & Summaries for GM
Fix/Summary Answers
1971 Buick electra 7.5L blinkers brake lights VIN: 484391H439
Thank you to everyone for all your help!! We did not know that the brake switch was wired to the turn signal. There must be a lot of great electricians on GM vehicles out there on IATN since almost every post was correct. After getting all the advice we were a...
1991 Buick Park Avenue 3.8L No Start, Stall VIN: 1G4CW53L7M
hey guys very sorry for the long fix reply the reason been is to make sure he doesn't came back. all had good replys butv car will spark if you have computer un pluged so computer was not the problem, and those who said check power and ground good ideal but wh...
1992 Buick Regal 3.8L MIL Lamp on VIN: 2G4WD11L8N
Hello and thank you to all that replyed. Yes it was the ecm giving us the problems, replaced it with new and it was good to go. Was my hunch all along but i have never seen those codes before and was a little hessitant to replace a 400$ component on a hunch. T... Trouble codes: 26 (Qaud-driver Ckt W/O ECM-Controlled Temp Light).
1990 Cadillac DeVille 4.5L Excessive Emissions VIN: 1G6CD5330L
The fix is in! As many noted, injectors are a big problem on this vehicle. Six out of eight injectors were out of spec. Not a cheap fix at $160.00 each but the vehicle is in perfect shape and the owner wants to keep it so it got a complete set. It's not cost...
1986 Chevrolet K20 Suburban Custom 5.7L PINGS Bad VIN: 1GBEK16L3G
Hello and I want to thank everyone who replied to my help request.I started by bringing 1 cyl. up to TDC and checking to make sure the damper had not slipped,as alot of suggestion said.Found damper OK.Next I installed a adjustable vacum advance from MR Gasket ...
1996 Chevrolet Cavalier 2.2L Transmission in UK VIN: 1G1JC5246T
I would like to thank those that replied to my help request. I was hoping to find someone in the UK that would have a trans. I wish it was as easy as finding one here! I will have to send one via Fed Ex or something similar if my customer decides. He may have ...
1997 Chevrolet Camaro 3.8L abs VIN: 2G1FP22K4V
problems with power feeds from fuse box were the most suggested tests. This car was actually missing a component of the traction control system which is controlled by the abs/traction ecm. The customer did not want to purchase the require parts so we unfortunt...
1998 Chevrolet Astro 4.3L rotors
WOW! 45 Replies. Many of the replies are very good, however some techs don't read the repair history as recomendations to focus on the rear brakes (ie why have you not looked at the rear brakes) were of little use. After carefull consideration and with the cus...
2001 Chevrolet Venture LS 3.4L gauge VIN: 1GNDX13E61
What I found is that the sender is available separately, however as one reply stated it makes sense to replace the FP Module considering the time & mileage on the vehicle and the labor there are two different units available depending on the wheelbase ( extend...
2003 Chevrolet Express 3500 6.0L Misfire VIN: 1GCHG35U23
Thanks to all that responded. Drove us crazy for awhile but we finally found a broken wire in harness. It was barely rubbed through. Located on left side under pcm. Thanks Again! Trouble codes: P0300.
1988 Oldsmobile Cutlass Supreme 2.8L No Start VIN: 1G3WR11W5J
Thanks to all (13) who replied. Several suggested checking fuel pressure regulator which I had done and ruled out. I got the car hot,then removed vac line from reg and put a clean piece of paper under it. It took about 10 minutes and fuel started dripping from...
1997 Oldsmobile Silhouette GL 3.4L Misfire, MIL Lamp on VIN: 1GHDX03E2V
Well after replacing the intake gaskets the vehicle continued to run it's fuel trim to -17 & higher. I should have noticed the amount of blow by earlier, but I didn't. So long as the PCV & breather hoses are not feeding engine vapor through the intake the fuel... Trouble codes: P0300 (Random misfire).
1999 Oldsmobile Alero GL 3.4L 1-2 shift VIN: 1G3NL1ZXC3
Thanks for the test procedures. Didn't get a chance to use them though. After informing the customer the whole list of possibilities and the prices, car was traded in.
2000 Oldsmobile Alero GL 2.4L Cuts out VIN: 1G3NL52T7Y
Thanks Robert. Ingnition switch fixed this vehicle. I wouldn't have though to look in that direction without your input. Thanks to all the replied.
1996 Pontiac Bonneville SE 3.8L Battery VIN: IG2H5216TH
I first want to sincerly thank all nine that responded.I tested the ignition switch's operation and it checked normal.But given that the problem was intermittant I replaced it anyway.Then after a couple hours of monitoring the problem came back.There were two ...
1993 Saturn SL1 1.9L Cuts out, Stall VIN: 1G8ZN5591P
ok, thanks for all the help, and the replies, most of you where right in saying it was the coil packs, turns out the 'known' good one was bad when installed, go figure?? Replaced with a new one, and car runs fine. THANKS for all your help DAVE Trouble codes: 26 (Quad driver module failure), 27 (Info flag QDM failure), 48 (info flag Reference pulse error), 42 (Bypass line error).
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