GM Automotive Technicians Technical Discussion and Fixes for Oct 14, 2009 - iATN (Members Only)

×

Join Now

Prev	Professional Automotive Repair Technical Discussions for October 14, 2009 International Automotive Technicians' Network (iATN) - Members Only	Next
(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
	1998 Buick Riviera 3.8L outlet temperature VIN: 1G4GD2219W this car is wearing me thin, everytime i let it go it comes back to me with a different problem. car first came in a couple of weeks ago with the code for the drivers temperature door actuator code. ok checked out actuator was getting signal from programmer bu...	View
	1992 Chevrolet Caprice 5.7L Cuts out, Stall VIN: 1G1BL8375N only shuts off when put into gear. its will run all day in idle. i got it timed but still same issue. ive had people say it could be a possible egr so i threw a part at it and problem still persists. i have others say that the torque converter could be stickin...	View
	1998 Chevrolet C1500 Silverado 5.7L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCEK19R3W Hello all you gm guys out there. I will start by saying I am not a gm guy. I own an import (german) repair shop. I am working on this truck for a friend. The vehicle came with a terrible misfire. All the ignition system looked old and worn. replaced Plugs,wire... Trouble codes: P0300, P0155, P0161 (o2 sensor heater circuit b2s1), P0442 (evap system small leak detected), P1345 (crank/cam sensor correlation cyl discrimination signal)	View
	1998 Chevrolet Camaro 3.8L blower motor VIN: 2G1FP22K2W Customer concern is there is a humming noise when the blower motor is on high. Removed blower and found the fan is off balance. Replaced with new one and there is still a humming noise. Couldnt see any debris or obstuctions. checked for any tsb's and found non...	View
	1998 Chevrolet K1500 Silverado 5.7L won't read empty VIN: 1GBEK19R3W Thanks for reading this- We have this Chevy Pickup that was towed in with no fuel in the tank. The gauge was reading 3/4 of a tank. While checking the scan data, we noticed that the fuel level read low there. The diagrams show the sender reading going to the P...	View
	1999 Chevrolet Malibu 2.4L Instrument panel illumination VIN: 1G1NDT52T4 Originally came in for no dash lights condition. I traced problem to the dimmer module under the instrument panel, mounted on a brace. Replaced module, lights worked 1 week.2nd Replacement module from dealer did not work- right out of the box. Thought I missed...	View
	2001 Chevrolet Malibu 3.1L steering axis inclination spec VIN: 1G1ND52J81 hi guys thanks for the help. i have a 2001 malibu that was wrecked for alignment and can't find a spec for steering axis inclination spec. mitchel and aldata just a waste of time.have napa spec book but not there either. if any one has the spec please e-mail m...	View
	2002 Chevrolet Astro 4.3L Cuts out, Misfire, MIL Lamp on VIN: 1GNEL19X62 this van is missfiring, spark knock under load 3rd gear hard throttle. dtc 335 keeps coming back and i've done all the checks in my modis checked the cmp sensor ,timing chain play ckp sensor. i changed the knock sensor just because.when i checked the KS it sco... Trouble codes: P0335	View
	2003 Chevrolet Impala 3.4L Stall VIN: 2G1WF52E73 Customer brought in vehicle complaint was dies every so often, when it dies instrument cluster all gauges go to zero and check engine light comes on only sometimes it will start right back up. I'm at a loss on this one please help thanks in advance	View
	2003 Chevrolet Trailblazer LS 4.2L Hesitation, Low power VIN: 1GNET16S53 Thanking all in advance .This vehicle is at another shop and lacks power only when the AC request is on. You may unplug the AC Compressor and drive the vehicle, and lack of power is present. If you turn the AC switch off the vehicle has sufficient power. They ...	View
	2003 Chevrolet Express 2500 5.3L fuel tank VIN: 1GCGG25U23 please help, i have been working on a good customers 2003 chevy express van and he can barely put gas in it, the gas pump shuts off like the tank is full. i replaced the vent valve on top of the tank because the dealer said it was the only vent on the tank. bu...	View
	2004 Chevrolet Colorado Z71 3.5L abs VIN: 1GCDT13684 This truck sets DTC C0040rf, RF WSS circuit fault. Graphing the sensor shows a lot of hash in the signal. The abs mode is activated at low speeds. The sensor was replaced, then the hub and sensor was replaced with no improvement. The wiring between the sensor ...	View
	2005 Chevrolet Colorado Sport 2.8L Mechanical VIN: 1GCDT19805 Upon initial inspect we noticed #2 cylinder spark plug had oil deposites on the plug, not fouled out yet but on the way. We researched some information on this and found an articicle that had to do with the crank vent system plugging up in the valve cover, so ...	View
	2005 Chevrolet Malibu 2.2L fuel gauge VIN: 1G1ZS52F65 this vechile came in fuel gauge erratic code p0463 fuel level sensor high volts cannot find info on code mitchells has no bulletins is there something specific to be looking for because i cannot get it to act up customer is patitent did check connection at clu...	View
	2005 Chevrolet Silverado 2500 HD 6.0L mode door VIN: 1GCHK29U15 customer had battery replaced at a big box store and now the mode door stays on defrost (it was working good before battery replacement). I have tryed disconecting battery for 5 min but has not helped. customer will be bringing truck back to me tomorrow for th...	View
	2006 Chevrolet Cobalt LS 2.2L shifts fine VIN: 1G1AL55F16 Trans. has whine noise in park and neutral. Noise is gone when car is in gear and wheels not turning. whine noise when wheels turning. Inspected drive gear and driven gear support bearings,appear ok. Drive chain seems ok also. Noise doesnt change when increasi...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y3X I WAS WRONG IN TYPING THE RESITANCE WAS .883 K OHMS. SO I STARTED UNPLUGING MODUALS WHEN THE CUSTOMER DECIDED TO TAKE THE AS IS. THANKS FOR ALL THE HELP.	22
	1999 Cadillac DeVille 4.6L duel zone climate control VIN: 1G6KD54Y5X I want to thank everone how took the time to reply, it seems everone could be considered correct however replacing both temp. actuators was the fix, after abserving both operate and disconnecting the linkage and manually operating them i determined that there ...	8
	2001 Cadillac DeVille 4.6L Poor Idle Quality, Surge VIN: 1G6KD54Y21 Thanks for the help turns out someone else had been working on this car.Customer told us no one had, the crank sensors were swapped installed them correctly and did relearn DONE!Thanks again it really helps when you have the right info.	6
	1997 Chevrolet Cavalier 2.2L radiator coolant flow thanks for all the good advise..i checked everything possible and this was what we found worked for us ,flushed the heater core and it was clean , so we removed the thermostat and all worked fine ,we changed the thermostat and it acted up again we than install...	31
	1998 Chevrolet C1500 Silverado 4.3L Excessive Emissions, Poor Idle Quality, Hesitation, Surge VIN: 1GCEC14W9W after checking crank sensor several times with lab scope,we finally seen a faulty signal and replaced it.engine ran better but not completely repaired.went back thru all tests and almost gave up.we decided to change to the new fuel injector design and test d... Trouble codes: P0300, P0339, P1404.	20
	2004 Chevrolet Silverado 2500 HD 6.6L excessive smoke VIN: 1GCHK23104 Sorry about closing this with out a fix. I recomended the injectors just because i looked into what you guys told me. I did sell 8 glow plugs because the check engine light came back on with a p0380. #2 glow plug has no ground now. save time doing all. THANKS... Trouble codes: P0380.	7
	2005 Chevrolet Suburban 1500 LS 5.3L Starter VIN: 1GNFK16Z65 Fixed the beast and here's what I found. I got 23 excellent intelligent responses on this and most were suspicious of the remote start unit or the ignition switch. This was a dealer add-on Astroflex system and it had been working properly up to the point when...	24
	2007 Chevrolet Tahoe LS 5.3L Mechanical VIN: 1GNFC13JO7 Thanks everyone for giving me your input on this problem. I probably didnt make it clear about the voltage from the sender was actually reading low oil pressure so I knew it wasn't the cluster, what was actually happening was the screen or filter was clogged u...	12
	1993 GMC C6000 Topkick C6H042 6.0L Poor Idle Quality, Surge, Cuts out VIN: 1GDJ7H1P8P JAY FROM TEXAS MY BROTHER THANKS WE WERE PRETTY SURE THAT WAS THE PROBLEM BUT I DID NOT HAVE THE RIGHT INFO AND DID NOT WANT TO BLOW 125.00 GUESSING DEALER ITEM ONLY AND ON THE WAY Trouble codes: 44 (lean).	9
	2005 GMC C4500 Topkick C4E042 8.1L Hesitation VIN: 1GDE4C1E55 Thank you to all that reponded.It was what all of you said,the pto was on.I had looked at that pid on the tech2 but I saw a * next to that pid and thought it might have been a option not installed.I was wrong.After we switched the pto off the tech2 was hooked ...	6
	1997 Oldsmobile Aurora 4.0L No Start VIN: 1G3GR62C0V Ok here it goes after doing extensive testing on the various areas you guys suggested. I found that the fuel rail still had alot of water in it so I took all hte injectors out and drained the rail all the way out put back together and got it running. Thats m...	17
	1993 Pontiac Firebird Trans Am 5.7L Hesitation, VIN: 2G2FV22P4P thanks for all the help this one is fixed i replaced the fuel tank vent valve alls well now thanks again to all	4
	1994 Pontiac Firebird Trans Am 5.7L No Start VIN: 2G2FV22P3R ENDS UP A BAD IGNITION SWITCH 1 VOLT DROP ON INJECTOR POWER CIRCIT INJECTOR AND PCM WAS SHUTTING INJECTORS OFF Trouble codes: 18 (no crank signal).	14
	2000 Pontiac Montana 3.4L Surge, Cuts out, Stall VIN: 1GMDX03E5Y Experimented with a used ignition module we had on the shelf and this seems to have cured the problem. will order new one and install.	8
	2001 Pontiac Grand Prix GTP 3.8L abs/traction control VIN: 1G2WR12171 Thanks to those that helped . Ernesto ,Adam ,Eric ,and Alfonso [...] don't know where you guys found the technical info but I am greatful. unfortunately even with all that we still could not get this vehicle repaired in the time we had. it is scheduled to come bac...	4

(Also Available: All, Asian, Chrysler, European, Ford, GM.)