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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 22, 2011
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Open Help Requests for GM
Help Request Answers
2003 Cadillac CTS 3.2L timing VIN: 1G6DM57N73
Vehicle came in with a broken timing belt. Later found out all the exhaust valve where bent. Had heads rebuilt. re-assembled heads and replaced timing belt. Started vehicle had misfire and lacked power. Acted like timing was off retarded. Torn back down and ch...
1998 Chevrolet S10 LS 4.3L slips after kick down
after kick down this truck is in coast till the throtle is lifted to idle, can bang on the rev limiter til you lift. trans rebuilt, new converter, all new electrics, new valvebody.
1998 Chevrolet C3500 Cheyenne 5.7L starter VIN: 1GBJC34R3W
key in on position starter cranks continuously pull starter relay still cranks turn key to start position sends ground fuel pump doesnt come on either
1999 Chevrolet Silverado 1500 5.3L No Start VIN: 2GCEC19T9X
Merry Christmas to all, This was a tow in,cranks , no start,no fuel pressure or spark. I noticed right off that the CEL was not on and the fuel pump would not fire up. I was able to pull several o2 codes though which surprised me since the cel was not on. I c... Trouble codes: M1SC
2006 Chevrolet HHR LT 2.4L MIL Lamp on VIN: 3GNDA23P86
Thank you in advance for your time. There is an 06 Chevy HHR in here and has check engine light on and no reading on temp gauge. Customer says he will be driving and the gauge dies and the light comes on. Also when this happens remote start doesnt work and a/c... Trouble codes: P0128
2007 Chevrolet Suburban 1500 Z71 5.3L Ebcm VIN: 3GNFK16357
This 07 Burb' will not leave our shop, no matter what I try. Since I don't have a tech 2, I suspect I will need one to remedy my issues... of course. Initially I replaced the speed sensors under warranty that another tech had done. When I did not get my speeds...
2007 Chevrolet Trailblazer LT 4.2L abs module VIN: 1GNDT13S37
no communication with ebcm abs light on power to ebcm ok tried new module can not communicate to program either
1996 GMC Sonoma SL 2.2L Excessive Emissions, Poor Idle Quality, Surge VIN: 1GTCS1440T
Could someone help me on this, its really being a tuff one. The truck has a lopey idle, and if you open the throttle it will kind of stall out. I found the brake booster hose with a huge crack in it and a vacume leak, I thought for sure this would fix it but i...
1999 GMC K3500 Sierra SL 7.4L 2nd gear VIN: 1GDJK34J8X
truck will start off in first and shift fine for about 5 min then it looses controll of the epc solnoid it drops off to 0 percent and 0 amps on my scanner . it then starts shifting hard and neuturals out in 2nd causing it to down shift into 1st again . if you ...
2004 GMC Sierra 1500 SLE 4.8L Misfire VIN: 2GTEK19V74
Car came in with random misfire code, misfires on 6 mostly and some on 5 but they are right next to each other in firing order so I have dismissed #5 misfires. Unplugging coil to 5 does drop RPM, unplugging #6 does not. I have performed cylinder balance test w... Trouble codes: P0300

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick LeSabre Custom 3.8L intake gaskets VIN: 1G4HP54K8Y
Thanks to all the many responses that I received. I had to go back to basics on this one. The coolant loss was actually from the coolant elbow going into the front of the lower intake manifold. I replaced both elbows and that solved that issue. The misfire wa...
1996 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W4T
Ok I learned something on this one. First I believe that I need my scanner checked. FTP never showed any reading. I got a reading to the PCM. Checked with multi meter. Check vac @ canister in and out. Was going to get a used PCM but customer wanted a new one s... Trouble codes: P0446 (EVAP Blocked).
2000 Chevrolet Express 1500 4.3L Poor Idle Quality, Cuts out, Stall, Misfire VIN: 1GCFG15W9Y
Thanks to William. The ecm did have to be flashed. after all the tune up issues and programming the truck runs great. we did find a coolant leak spraying on the radiator fan and blown onto the pcm. we opened the pcm and the corrosion literally fell out like di...
2002 Chevrolet Trailblazer LS 4.2L Temp Blend Motor VIN: 1GNDS13S32
hi all thanks for the replies, it was a bad temp actuator. replaced it on monday but waited till now to close this out to give it a few days to make sure. customer called to say all is good! oem parts gotta love that huh! ac delco part says made in china, what...
2006 Chevrolet Suburban 1500 Z71 5.3L Front Blower VIN: 1GNFK16Z76
installing a new blower fixed it---thanks to all. This is where I would have closed this but IATN wouldn't let me-not enough information so now I have to type in this useless dribble.
1997 GMC C3500 Sierra SL 6.5L MIL Lamp on VIN: 1GTHC33F7V
Thanks for all the help guys, and to Patrick for all your info during our phone conversation. At this time the customer is going to allow us to continue "playing at our leasure" with this one. I have learned alot. We put a new PDM in the truck and it wouldn... Trouble codes: 183 (fuel temp. sensor circut high), 231 (fuel/lift feedback circut low), 251 (inj pump a rotor/ cam problem), 370 (timing reference a high res problem), 238 (boost sensor 1 circut open/high).
2003 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NV52EX3
Well unfortunately this one is not fixed customer is taking it for now. I did find out the he has done a lot of wiring on it himself and I found some wires with warmed up insulation underneath when i was disabling the vtd as recommended by a reply. what bother...
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