× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 4, 2010
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
1990 Buick Century Limited 3.3L No Start VIN: 1G4AL54N9L
does anyone know what the spec is? mitchell does noy give one.i know your not suposed to ask for specs but cant find it anywhere. thanks for the help.car will run on alternate fuel.
2002 Cadillac DeVille 4.6L mode actuator motor VIN: 1G6KD54Y22
The mode actuator is stuck on the shaft coming off the door. We have removed all of the bolts and have used both a mirror and a borescope to determine if there are any reasons it wont come off the shaft. It appears to just be stuck. I am afraid to pry on it be...
1991 Chevrolet Lumina 3.1L injector pulse VIN: 2G1WN14T7M
customer brought car in from another shop for no start when warm they have replacd used that ran on another car ign module and coils, crank sensor map sensor fuel pump fuel filter spark plugs & wires air filter fuel pressure is 40psi I have no injector pulse w...
1995 Chevrolet C1500 Silverado 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GCEK14K6S
Truck Came In With A Hesitation And Surge At At Idle.Starts To Run Rough Only When In Closed Loop. Replaced Oxygen Sensor. Still The Same. O2 Stays High At About 1v Then Will Come Down To .7v But No Switching. I Disconnected O2 Sensor So Truck Stays In Open Lo...
1996 Chevrolet C1500 Silverado 5.7L Misfire VIN: 1GCEC19R6T
I have this vehicle in the shop and it has a rather constant misfire on cyl 5 according tto the scanner. Fuel pressure good,secondary ignition looks fine on scope,no vacuum leaks, swapped pllug with no change,suspecting fuel injector. but jumped injector with ... Trouble codes: P0300 (multiple misfire)
2001 Chevrolet Silverado 2500 HD 6.6L White smoke VIN: 1GCHK231X1
THANKS FOR TAKING TIME TO CHECK THIS ONE OUT. Primary problem is heavy white smoke from exhaust at idle and worse under acceleration. Cooling system is full and holds pressure. We do have a tech2 scanner. Fuel rates on scanner are all at 0. I can increase fuel...
2001 Chevrolet Suburban 1500 5.3L Compressor VIN: 3GNEC16T21
Hello techs gota 01 suburban with no a\c comp not engaging.sys works fine with scan tool comp will engage.when not engaged no a\c request on scan tool. Very int.A|C button lites up on panel.ck request line from pcm to control and is ok with no breaks.per allda...
2006 Chevrolet Silverado 3500 LT 6.6L Misfire VIN: 1GCHK39D36
Hi everyone, We have a problem with this truck and have a few questions. First, we have a slightly rough running condition and when accelerated hard it blows out black smoke and there seems to be a knocking/clattering noise in the engine. We have verified tha...
1989 GMC G3500 Magnavan 7.4L add on overdrive VIN: 1GBKP37W4J
The customer recently purchased this unit out of state, sight unseen. He realised on the way home that the overdrive does not shift. This is a Doug Nash unit. In trying to research it, I can find info on the Corvette version but not this unit. It looks a lot d...
2001 Oldsmobile Alero GL 3.4L No Start VIN: 1G45C47KB5
hey guys. got this '01 alero that doesn't want to start sometimes. fuel pump runs with immediate fuel pressure. good spark. good clean car. it decides not to start sometimes. it does have the paskey system. there are no codes, ever. i was finally able to deter...
1996 Pontiac Sunfire GT 2.4L Poor Idle Quality, Surge, Stall VIN: 1G2JB12T8T
Hi, car starts fine, after 30 seconds it begins a surge at idle. Gets worse until car dies. Surging is caused by fuel trims being driven lean. Spraying fuel restores power/idle for a bit. Oxygen sensor reads over 1050mv except for short bit after decel. Actual... Trouble codes: MAP
2002 Saturn L300 3.0L MIL Lamp on VIN: 1G8JW54RX2
Customer had us address misfire issue and we suggested replacing the air tubes on intake due to visible cracks.everything went fine.2 days later he returned with a check engine lite.this time it was a po 150 that wasn't there the first time.bank 2 sensor 1 o2 ... Trouble codes: P0150
2004 Saturn Vue 2.2L MIL Lamp on VIN: 5GZCZ23D54
In for emission test, had mil illuminated code P0378 can't find much info on this code. Trouble codes: P0378 (Timing reference high resolutionsignal B intermittant/eratic pulse)

Fixes & Summaries for GM
Fix/Summary Answers
2004 Cadillac CTS 3.6L Cuts out, MIL Lamp on VIN: 1G6DM57724
1989 Chevrolet Corvette 5.7L Hard start VIN: 1G1YY218XK
hey guys, i appreciate all the great tips and help everyone sent in. the customer did not want to remove the tank which is where our problem may have started. also the customer did not want to pull the injector rail. we did however put another fuel pump becaus...
1997 Chevrolet S10 4.3L 1st Gear VIN: 1GCDT14X7V
Thanks guys... The truck is fixed! As simple as that ign switch. Sure was a nice easy fix for having all those problems. Thanks again everybody.
1998 Chevrolet K2500 Silverado 5.7L Hesitation, Stall VIN: 1GCGK24R7W
thanks for all the help guys. it seems we had a few different problems here. first, the intake gaskets installed at another shop were severley over torqued and they had put silicone around the intake ports. we cleaned up that mess and replaced a leaking fuel p...
2002 Chevrolet Tahoe LT 5.3L rear temp door actuator VIN: 1GNEC13Z62
this one is fixed turned out had wrong actuator part was ordered from dealer by vin. and was listed wrong had only 4 pins and needed 5 went ahead and replaced evap housing when i had it out foam was worn and bracing had slight warpage thanks to every one who r...
2002 Chevrolet Corvette Z06 5.7L Code - C1233 VIN: 1G1YY12S52
At the module, I cut the rf wire pair & lf wire pair & switched them. Went on a road test & same code came up which I decieded to blame the module. Sent the module out for repair & reinstalled. Road test & same code on hard accel. Bought a rebuilt module from ...
2003 Chevrolet Silverado 1500 4.8L air bag light on dash VIN: 2GCEC19V43
thanks to all, the problem was in the sensor under the pass seat.
2003 Chevrolet Silverado 1500 4.3L Temp gauge/Sender VIN: 1GCEC14X43
A new thermostat and an ECT corrected the P0128 ECT code, but the temp gauge alternates from reading zero (fixed) to reading about 190F (fixed) . The temp readings from the scanner are normal, but do not correspond to the gauge readings. The majority of respon...
2003 Chevrolet Cavalier 2.2L No Start, Stall VIN: 1G1JH14F63
well i checked the ignition switch it had already been replaced sounds like a very common problem but this one was already done. checked the voltage a pin #19 like bob said and i was getting 12.5 volts. and still only got 10.5 volts to the control side of the ...
2004 Chevrolet Silverado 2500 6.0L No Start, Stall, MIL Lamp on VIN: 1GCHK24U14
INSPECTED ALL WIRING AND FOUND MOISTURE IN THE PCM CONNECTOR AND CORROSION ON CRANK SENSOR TERMINAL IN PCM. REPAIRED CONNECTOR AND REPLACE PCM AND VEHICLE RUNS AND STARTS PROPERLY. Trouble codes: P0332 (Knock sensor 2 signal short/low), P0335 (Crank sensor a circuit problem), P0336 (Crank sensor a 18/24x out of range), P0455 (Evap large leak).
2004 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK23254
Well guys it took an inejctor pump, its a pricy job but somebody had to do it. I double checked all feed line connections and even put on another new GM filter housing (complete with filter and sensor) with no change. We installed a new injector pump and it ...
2007 Chevrolet Silverado 2500 HD Classic LT 6.6L Hesitation, MIL Lamp on, no power VIN: 1GCHK23DX7
Okay guys this one is down the road. Didn't get much help on it. After I sent in help request I ran a charged air leak test. This is done with some special plugs and a gauge, basically you plug off the exhaust at manifold and put a fitting in the pipe after th... Trouble codes: P0299.
1991 GMC C1500 Sierra 4.3L Surge, Cuts out, Stall VIN: 1GTEC14Z1M
Fuel pressure was within specs. its supposed to be 9-13psi. Customer said that the vehicle drove fine, just wouldnt idle. I drove it. Bad fuel pump, so obvious. Replaced fuel pump and vehicle is good. thanx for all the help!
1996 Oldsmobile Achieva SC 2.4L anti-theft system VIN: 1G3NL12T2T
We had 2 problems causing our issues. First, we did replace the tumbler since we had a failure through the pass key circuit. Second, the CPS was dead, causing the no start. Thanks for all the advice.
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next