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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 2, 2009
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1994 Buick LeSabre Custom 3.8L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1G4CU5215R
Cust states the car now has a hesitation/misfire under load when taking off from a stop. This of course has never been a problem until we fixed it. It is getting a code for no spark reference signal from the crank sensor to the icm. I have troubleshot the wire...
2001 Buick Century Custom 3.1L Water Leak VIN: 2G4WS52J26
Car came in for blower inop. Power and ground at motor. Removed blower motor and found that it was full of rust and wet. I can't see the water comming in. Something is leaking slow enough to leak on the motor, but not fast enough to leak on the floor. Just won...
1995 Chevrolet Blazer 4.3L No Start, Hesitation, Cuts out, Stall VIN: 1GNDT13W6S
vehicle does not start,it will start if you just bump ignition switch to crank for 1-2 sec.then will start.if hold in crank it will not start,once the engine is running it will have a slight hesition.if you turn on all electrical loads it will fall dead on its...
2002 Chevrolet Impala 3.8L MIL Lamp on VIN: 2G1WH55K71
greetings to all this chevy set a code for the air injection system.i have checked the air pump and that functions i then checked the solenoid which supplies vaccum to the air valve and thats working.i removed the air valve and when there is no vaccum you cant... Trouble codes: P0410
2004 Chevrolet Corvette 5.7L Diff Leak VIN: 1G1YY32G44
We have here a 2004 chev corvette convertible. About 18 months ago, the vehicle came in for a large differential leak. We resealed the differential using the appropriate sealers and new axle seals. Refilled with gm fluid and the additive. Ever since... The v...
2008 Chevrolet Silverado 1500 LS 4.8L horn VIN: 1GCEK19C68
horn inop, check fuses under hood horn fuse hot all the time. scan body computer no codes ,command horn on w/scan tool no noise. check input/ outputs no change when pressing horn pad. does not work with key fob also. went to horns under each head light both ha...
2003 GMC Envoy XL SLE 4.2L ignition coils VIN: 1GKET16SX3
I had the customer come in with a mis-fire cylinder 6 and when I pulled the coil it was full of water. There was one inch of water around the plug and heavy condensation. Plug and coil 5 were starting the same issue. Any help on this cause would be great. Reme...
2006 GMC Envoy SLT 4.2L MIL Lamp on VIN: OGKBT13S46
This envoy came in with po171 lean exhaust can find no vac leaks or air filter problems.The st fuel trim is at 20% so there is a problem. Everything looks normal on the scanner when driving except fuel trim. Do these have injector pluging problems. P.S. The o2... Trouble codes: 171 (lean exhaust)
2004 Saturn Ion-2 2.2L rh headlamp VIN: 1G8AZ52FX4
rh headlamp dim, found no power from fuse wiring o.k. bcm?

Fixes & Summaries for GM
Fix/Summary Answers
2002 Buick Rendezvous CX Plus 3.4L MIL Lamp on VIN: 3G5DB03E52
This is not a complete fix, because the customer declined to do any work. I wish I had a smoke machine, because all the second guessing I was doing made the diagnosis even longer. So I ordered a new MAF and put it in and all was good. Trims stayed around 0 and... Trouble codes: P0171, P0300.
1976 Cadillac Eldorado 8.2L Horns
Well I have fixed this vehicle. Thanks to everyone that replied, they all had very good ideas of places to look for the relay but unfortunately I don't know if someone has altered this vehicle or what has happened. I was unable to locate the blasted relay! I l...
2002 Cadillac DeVille 4.6L Traction control light VIN: 1G6KD54Y52
The traction light is still on. Retested power to the EBCM at start up and it never fluctuated. There was no interruption of power during start up. We even got into the re-flashing business since this episode began. Modules were programmed to each other a...
1993 Chevrolet S10 4.3L Unknown VIN: 1G1FP234ZD
Thanks for all the reply. The problem is bad combination valve.
1996 Chevrolet C1500 Silverado 5.7L No Start VIN: 2GCEC19R5T
Turns out the customer had replaced the ignition coil & module attempting to fix this vehicle before it was brought to us. What I finally found was the tach signal connector in the coil bent over and not even making a connection. Thanks to all that replied.
1997 Chevrolet K1500 Silverado 5.7L Cuts out, Misfire VIN: 1GCEK19RVE
Richard [...] got the right answer with the crank sensor rubbing on the reluctor ring because of distorted cover. So I put a small spacer under the sensor and a different sensor and It hasn't missed a beat yet. I had 13 replys with comments such as: Carboned u...
1999 Chevrolet C1500 Suburban 5.7L abs VIN: 1GNFK16R1X
2000 Chevrolet Astro 4.3L No Start VIN: 1GNEL19WXY
Although I had checked the ignition switch for power output, I decided to recheck it after so many people (Bob, Brian, Kevin, Russ, etc...) had pointed in that direction with many switch failures credited to them. I had intermittant power to pink wire which fe...
2002 Chevrolet S10 4.3L gas tank VIN: IGCDT13W52
we were FINALLY able to find a used gas tank in conn. thankyo all for your help we did not want to put a used tank in but had no choice, as this was a 4 dr s10 and everyone we checked with had gas tanks for a two door s10. thanks again dave
2006 Chevrolet Silverado 2500 HD LS 6.0L Poor Idle Quality, Misfire VIN: 1GCHC24U11
Problem was the main grounds @ frame under drivers door and behind eng. block cleaned them both vehicle runs good. Trouble codes: P0300.
2006 Chevrolet Silverado 1500 LT 5.3L engine VIN: 2GCEK19B26
Thanks to all. I found a small piece of debris imbedded in the oil pressure regulator valve. Debris was missed on first inspection. Replaced oil pump all is well. Thanks again for all the replies.
2002 GMC Envoy SLE 4.2L Vibration VIN: 1GKDS13S62
Craig in Ohio gets the prize on this one. I replaced the mounts with OEM GM parts and the vibration is gone. Thanks for the reply Craig!
1991 Pontiac Sunbird LE 2.0L Excessive Emissions, Poor Idle Quality VIN: 1G2JC14K0M
This is an ugly fix but it did pass its smog check. Nox came down to 650 at 15/50 and 150 at 25/25. I replaced the egr but it performed the same as the old so that didnt fix it. By the way it is a positive bpegr and rpm raised when taking off th...
1995 Pontiac Grand Am SE 2.3L lifter VIN: 1G2NE55D3S
You guys were right on the money, I pulled the timing cover off, secured the guides, ran the vehicle and saw the tensioner plunger jumping in and out. Oil leaking out through the tensioner. Marked the tensioner at it's current position and removed it. Found te...
1999 Pontiac Grand Am SE 3.4L Excessive Emissions VIN: 1GCCS1442T
thanks to mike,doug & bruce,cleaned maf on both cars they didn,t look dirty but cleaned them any how ,fuel pressure no problem,so i also changed front o2s both a little lazy,and #s back to normal thanks again guys
2006 Pontiac G6 2.4L MIL Lamp on VIN: 1G2ZF55B26
Hello fellow iatn members it looks like i have fixed this car sorry for the long fix it took two weeks for all the parts to come in i did replace the timing chain, crank sprocket, guides and tensioner . The tensioner was fun to set up correctly you have to ma... Trouble codes: P0010 (intake camshaft position actuator solenoid control circuit), P0011 (intake camshaft position system system performance).
2009 Pontiac G6 2.4L compressor VIN: 1G2ZG57B39
Dealer 1st installed new belt, next day noise was back. 3 days later they put on new tensioner. So far the noise is gone, but ,of course, all this week it's been cold & no A/C been needed. Thanx for the help & I'm fairly sure this isn't over yet. If things cha...
1992 Saturn SL1 1.9L Poor Idle Quality VIN: 1G8ZG5490N
I would like thank all of you taking the time to respond to our help request, a special thanks goes out to Don. The retired saturn tech. Don you were wright on, the wiggle test helped us to locate the problem and repair the car. The CTS connector part # 121170...
2003 Saturn Vue 3.0L fuel gauge VIN: 5GZCZ53B13
thanks to all it was senders and reflash bcm cool system resistance values very critical on senders a few ohms off sends gauge crazy
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