GM Automotive Technicians Technical Discussion and Fixes for Mar 7, 2007 - iATN (Members Only)

×

Join Now

Prev	Professional Automotive Repair Technical Discussions for March 7, 2007 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 Regal 25th Anniversary Edition 3.8L abs VIN: 2G4WF5216W car came in with complaint of abs, trac control & mil lights coming on after drive 2-3 miles (condition has been erattic for several months but now is more consistant) scanned found code c1233 rf or any w.s.sensor open circuit/ short. sensor and harness tested...	View
	1981 Cadillac Fleetwood Brougham 6.0L Poor Idle Quality VIN: 1G6AF2392B I need an idle relearn procedure for this vehicle. The procedure in my information is not correct	View
	1997 Cadillac Catera 3.0L abs VIN: W06VR52R3V Hi everbody, need help with this catera, cannot get our MODIS or a borrowed TECH2 to communicate with the EBTCM. Both the ABS & TC lights are on, no codes present for eng., tans., or body. have all signals from all 4 wheels to EBTCM. Have found LOTS of posting...	View
	2000 Cadillac DeVille DHS 4.6L Tach, speedo,turn signals and backup warning indic VIN: 1G6KE57Y4Y After starting the engine it takes 2 minutes before tachometer, turn signals, speedometer and back up warning indicator starts to work. These are the main things that I notice don't work.	View
	1993 Chevrolet C1500 Cheyenne 4.3L running lights VIN: 1GCEC14Z6P Can someone please send me a schematic of the running light circuit. Or if you know a good place to look for a common short in this system, it might save me a few hairs. Thanks in advance. Brad	View
	2000 Chevrolet Corvette 5.7L Rear of transmission leaking VIN: 1G1YY22G0Y Need some help with this Vette. There is trnasmission fluid leaking from between the rear of the transmission and the rear end. The weird thing is that sometimes it will not leak at all. When it leaks it leaves a trail of fluid. Seems to be when the outside te...	View
	2000 Chevrolet Venture 3.4L dash VIN: 1FBSS31LXW We had this venture come in with rear door latch message on the little lcd. Of course there is no test in mitchell for that error so we tore the rear panel off. Disconnected everything in the rear hatch & light was still on. Talked to GM & they said they sell ...	View
	2001 Chevrolet Silverado 3500 LS 6.6L Cooling Systems VIN: 1GBJC341X1 this truck will push coolant out of the overflow bottle first thing in the a.m.,put combustion tester on,head gaskets seem ok. it builds up a lot of pressure in the system, pulled the return coolant line off the turbo and put a pressure gauge on it,crimped off...	View
	2002 Chevrolet Tahoe LS 5.3L rear AC/heat VIN: 1GNEC13Z53 The rear AC will not cycle from hot to cold. A new blend door motor and rear control module have been replaced. Rear case was replaced at dealer. Upon installing new motor blend door went straight to cold. Every other operation of all other controls works just...	View
	2002 Chevrolet Corvette Z06 5.7L reverse, 2nd VIN: 1G1YY12S62 this vehicle will not go into reverse. when shifted into reverse it has a grinding stipping sound like it is not engaged into gear all the way. also it will pop out of 2nd gear unless you hold the shifter. all of the adjustments on the shifter seem to be ok. a...	View
	1998 GMC K2500 Sierra SL 5.7L poor power VIN: 1GTGK29ROW Hi gentlemen, this truck came in today, not starting well and not much power after it had run a few minutes. I tested the fuel pressure, and decided to pull the pump as the pressure was right on the edge, about 52 lbs.,i was surprised to find the fuel tank col...	View
	1999 Oldsmobile Alero GL 2.4L Electronic VIN: 1G3NL52T9X This olds came in with ABS & TCS lamps on. Has codes C1223 R/F speed sensor; [...] illuminated red brake warning lamp & C1246 rear ABS channel will not move. I inspected brakes. fronts OK & working; rears no pad material left but has rusted rotors. I have...	View
	2001 Oldsmobile Aurora 3.5L Hesitation, MIL Lamp on VIN: 1G3GR64H51 THe mil light is on, code PO300 random mis-fire. Mis-fire data shows all cylinders are having mis-fires but not severe enough to feel. I cleaned the MAF sensor and checked fuel pressure, checks OK. Do they have intake issues, I spayed carb cleaner around and R... Trouble codes: P0300	View
	1991 Pontiac Grand Prix LE 3.1L Surge VIN: 1G2WH54T9M this car surges when idle, hot, in gear and have replaced idle air control. car will not run and re-learn idle	View
	2000 Pontiac Grand Prix GTP 3.8L engine fire VIN: 1G2WR1214Y Bought this at salvage aution. It had a small fire on top of the motor and behind the motor. I checked the archives and found posts about fuel pressure regulators failing and causing the intake to explode. Those were all on normally aspirated engines with plas...	View
	2002 Saturn SL2 1.9L Hesitation VIN: 1G8ZK52762 Customer brought car in for a routine tune up and oil change, didnt notice it running bad before work but only went around the block to warm the oil a little bit before changing oil. I replaced the spark plugs (auto lite)wires (carquest) and fuel filter (wix) ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Cadillac DeVille 4.6L Poor Idle Quality, MIL Lamp on VIN: 1G6KD52Y4T Thanks to the following Techs:Bradley [...] advised us to check the t... Trouble codes: P0507 (High idle).	7
	1993 Chevrolet Lumina Euro 3.1L bad computer info VIN: 2G1WN54TXP Thanks for all the replies. Most replies suggested bad power/grounds, error with scan tool and with bad parts. I use a otc scan tool and had to put car in as a 95 to get good readings. Power and Grounds were all good. The real problem was with bad control modu...	32
	1995 Chevrolet Blazer 4.3L Poor Idle Quality, Cuts out, Stall, Poor Fuel Economy VIN: 1GNDT13W1S Well I went back through and found that by wiggling the wiring harness to the 'spider' I could get it to stall. I replaced the wiring harness to the injector assembly, and while I was under the plenum I removed the fuel press regulator, and replaced it. Proble...	23
	1999 Chevrolet Tahoe LS 5.7L Poor Idle Quality, Hesitation, Misfire VIN: 1GNEK13R6X Thanks for all the help. We pulled the distributor and found the dist. gear severly worn. Installed new dist. gear and problem is fixed. We are starting to see a few of these 5.7 vortec engines in for worn dist. gear. Oil dilivery problem? Thanks again Trouble codes: P0300 (Random multiple missfire).	28
	2000 Chevrolet Blazer LS 4.3L transfer case VIN: 1GNDT13W5Y thanks again for the advice. the problem was a bad vacuum switch on the firewall and the selector switch on the dash. we had replaced each separately but not both at the same time. sometimes having test parts isn't that much help if you don't leave them in unt...	20
	2001 Chevrolet Venture LS 3.4L Poor Idle Quality VIN: 1GNDX03E71 after long testing this vehicle never I could duplicate the concern of the costumer. several component we test but anything wrong. we trace all wire of TPS and look for something wrong in the resistance but nothing. replace hall efect crank sensor because was ... Trouble codes: P0336 (crank angle sensor).	9
	2001 Chevrolet Express 3500 5.7L Poor Idle Quality VIN: 1GCHG39R11 we found that we were loosing the'a' side high and low signal to the iac and found the pcm was dropping out-replaced pcm and reprogrammed pcm and van is working great. thanks to all that responded! every bit helps! Trouble codes: P0506, P0507.	7
	2001 Chevrolet Impala 3.4L Electronic VIN: 2G1WF52E11 Thanks for all of the help! As everyone said, the side cover could be removed fairly easily. I also needed to remove the hose from the air filter to the throttle body, to allow the engine to move down further. I also took the left mount bolt out of the steerin...	4
	2001 Chevrolet Malibu 3.1L no start VIN: 1G1ND52J16 Update and fix: Forget to mention yesterday, battery was at 12.45 volts when car came in. Battery was never ran dead for me and customer swears for her also. I tried the relearn procedure numerous times yesterday to no avail. Unhooked battery overnight, tr...	18
	2004 Chevrolet Blazer LS 4.3L O2 sensors, charge light VIN: 1GNDT13X34 I received a fax of wiring diagrams from mitchell. These are very difficult to read. I sent this one back to the salvage yard. They will look at it further. If anyone has any better wiring diagrams, could you please fax them to me? I think the problem is somew...	4
	1998 GMC Jimmy Envoy 4.3L heater core VIN: 1GKDT13W4W This vehicle seems fine now time will tell, but tried it two days now -39c yesterday with wind chill and today slightly warmer, heat just below 150deg f in dash. Tech posts were many but generally flushing system different ways, one uses hydroblast air mixed w...	24
	1999 GMC Savana 3500 5.7L turn signals VIN: 1GDJG31R0X Everyone suggested the same path I was going down. The fuel gauge acting up led me to think grounds,grounds,grounds. I was headed toward the back of the vehicle to inspect the wiring at the point the customer decided they didn't want to spend any money chasing...	14
	2002 GMC Envoy SLE 4.2L front differential VIN: 1GKET16S03 I narrowed the problem down to the front differential.I removed the differential from the truck and after disassembling we found several teeth broken on the ring and pinion.I asked the customer if he put it in 4wheel at a high speed and his reply was that car ...	4
	1994 Oldsmobile 98 Regency Elite 3.8L Hesitation, MIL Lamp on VIN: 1G3CW52L9R Well Car is fixed, we went back to car and suddenly we had scanner communication and got codes for crank and cam error also spark reference lost. we check'd and found some hash in the readings from the crank sensor, we replaced the crank sensor and car still r... Trouble codes: P0321 (spark reference lost), P0341 (camshaft crank error), P1361 (ignition controll toggle error).	4
	2000 Oldsmobile Silhouette GL 3.4L Inst/Radio VIN: 1GHDC1358Y Well, folks, most of you say that I would need to reprogram the unit with a Tech II or a visit to the GM dealer. Since neither of these appealed to me, I unsoldered the bulbs from the donor instrument cluster and soldered them into the original unit. One respo...	9
	2000 Pontiac Grand Prix GT 3.8L fuel VIN: 1G2WP52K4Y well this one is gone , as most replies to my post stated to reset the security by leaving the key turned on till the security lite stops flashing , then turn the key off for approx fifteen minutes . i had to do this several times before i could get the car to...	13

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