GM Automotive Technicians Technical Discussion and Fixes for Jan 8, 2008 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1988 Chevrolet K1500 Cheyenne 5.7L Hesitation, Cuts out, Stall, Misfire, Poor Fuel Economy VIN: 1GCDK14K8J At startup we get kick back. Like when the ignition timming is way off but its at spec. Distributer position is good. While going down the road at 65 we get a backfire a stumble and it falls on its face. No codes will set. The engine will idle great and rev go...	View
	1995 Chevrolet Caprice Classic 5.7L Poor Idle Quality, Stall VIN: 1G1BL82P9S This car will crank, start & imeadiatly stall. Sometimes it will do it 5 or 6 times in a row, sometimes it will not do it at all. Problem is getting worse though. I noticed this problem a few months ago on this vehicle. Car sat inside the shop overnight, went ...	View
	1996 Chevrolet C3500 Cheyenne 7.4L Hesitation, Surge, Cuts out, Misfire, MIL Lamp on VIN: 1GBKC34J8T New Years day we got 8 inches of snow and I got called into work for snow removal. I usually stay in the garage and do Mechanic work keeping all the plow trucks going but with 18 plow trucks and 10 people, they sent me out plowing streets. I was assigned this ...	View
	1997 Chevrolet Venture 3.4L heater VIN: 1GNDX06E0V This van still has poor heat.I find when I rev it up and hold it for a few minute the heat comes back. I read about a pump that goes in a heater hose to aid circulation but the customer is hesitant to put it in because he said the van always had good heat befo...	View
	1998 Chevrolet Venture 3.4L Cooling Systems VIN: 1GNDX03E6W Customer had another shop replace thermostat due to overheating. After replacement they said it came close to overheating once and then dropped down. Now they brought it to us and at cold start up it will get up to about 3/4 or higher on the temp gauge before ...	View
	1999 Chevrolet Blazer 4.3L Mechanical VIN: 1GNDT13W1X never seen this!!!customer drove car for 600 miles came in on hook running terible. found #2 cylinder with valve stuck and hit piston the vavle stem had stuck in guide we have check for bad intake or vacume leaks egr ect and have found no problem on teardown. ...	View
	2000 Chevrolet Cavalier Z24 2.4L Excessive Emissions, Poor Idle Quality, Surge, MIL Lamp on VIN: 3G1JF12T7Y Any other suggestions as per testing before tearing out front cover to check for jumped tooth? Trouble codes: P0300	View
	1989 GMC Safari SLE 4.3L Overheat VIN: 1GKDM15Z4K Hey guys, Our shop recently replaced an engine in a 1989 GMC Safari van. Unfortunately, ever since the repair, we have been having having problems getting the temperature gauge to read properly. As the vehicle warms-up, the "digital" temperature gauge starts t...	View
	1996 GMC K2500 Suburban 7.4L Starting VIN: 3GKGK26J9T This vehicle will start immediately when cold and if has been running. Once engine is up to heat and then shut down and left for about 40 minutes or longer and the temperature seems to be in the range between 110 and 125 the engine will crank for 4 to 5 second...	View
	2005 Hummer H2 6.0L front differential VIN: 5GRGN23U95 This one just came in with the front diff leaking out the vent tube. I've checked the forums and found nothing related. No service has ever been done to owners knowledge. Any help will be appreciated.	View
	1990 Oldsmobile Cutlass Ciera SL 3.3L Torque steer, instability VIN: 1G3AM54N6L Hello group, This car came to us for struts and tires. Due to normal wear with almost 200,000 miles. We found both axel boots torn and replaced with new half shafts. So, we have installed 4 new tires, 2 front gas struts and 2 front axels and performed an align...	View
	1993 Oldsmobile Cutlass Ciera 3.3L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G3AG54N2P Hello all,we have had this car for 2 days with no answer to the problem.Today we did notice that cold start up the engine idle unstable then a/c compressor comes on/off then the cooling fan comes on the the engine shuts down.Right before the a/c comes on we lo...	View
	2000 Oldsmobile Intrigue GL 3.5L MIL Lamp on VIN: 1G3WS52H7Y Those damn intermittents... --- ==Codes retrieved from PCM:== P0131 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 1) [history,non-mil related] P0137 O2 Sensor Circuit Low Voltage (Bank 1 Sensor 2) [current, mil related] --- --- ==History Codes in PCM:== ...	View
	2001 Oldsmobile Aurora 3.5L Cuts out VIN: 1G3GR62H01 Complaint was :While driving ,ONLY in very wet weather, tach will start to read excessively high and peg if you it accelerate ( While engine RPM is normal - NOT trans problem )Then engine will start to sputter & engine will die like someone shut off the key. Y...	View
	2003 Saturn L300 3.0L valve train VIN: 1G8JW54R63 hey guys ive got this 03' 3.0L that has a rattle in the valve train. it sounds to me like its in the rear bank. i have heard that there are problems with these valve trains and was just wondering if any of you saturn guys would know of any common problems with...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Buick Regal Custom 3.1L No Start, Stall VIN: 2G4WB54T2M Hello again As most all of you let me know, there was a problem in the injectors. I unplugged and ohmed the two that were accessible. Cyl 1 checked at 12.3 ohms but # 6 cyl checked at 0 ohms. We pulled plenum up and ohmed other four at that point and they all ...	27
	1994 Buick LeSabre Custom 3.8L unknone VIN: 1G4HP52LOR Thanks to everyone`s help.The end result to the fix was a cracked input drum.William from north carolina nailed it. Nice work everybody. AITN rules. Have a great year.Len.	9
	2001 Buick LeSabre Custom 3.8L MIL Lamp on VIN: 1G4HP54K41 Hi Techs. Well this one is done and gone, but not with out all of your help. Thank You. I tested the EGR Valve with the Engine running and stalled the Engine by putting it to 100% so I know the passage was not pluged. I fired up the Air Pump and checked th... Trouble codes: P1404 (egr position failure).	40
	2002 Cadillac Escalade 6.0L chmsl VIN: 1GYEK63NX2 I removed CHMSL , is molded plastic, would have to cut it apart to try to fix, would spend hours on it and it still may not be repairable. I would like to try to fix it if customer decides to replace it with a new one. Is easy to remove, just raise the liftgat...	6
	1995 Chevrolet P30 6.5L Leaks VIN: 1GBKP32Y2S The Fitting did turn out to be something that was installed @ the factory,to set the pump timing, although the GM dealer says not. I was unable to eliminate the fitting by bending the line, so after the holiday, I obtained one from a core pump that the inje...	4
	1996 Chevrolet K1500 5.7L High Idle VIN: 1GCEK14R9T As i stated in my help IAC was being commanded closed and would not extend to close bypass. I ohmed all 4 wires to the computer and checked good. Had a sleepless night and worked on the truck all night. Came in this morning left the IAC plugged in and tested r...	20
	2001 Chevrolet Impala 3.8L rack? VIN: 2G1WF55KX1 THANKS TO ALL 11 TECHS RESPONDING! CUSTOMER TOOK CAR WITHOUT PROCEEDING, I WENT ON VACATION AND JUST RETURNED. VERY INTERESTING RESPONSE FROM STACY INDICATING THE EXISTENCE OF A FILTER IN THE RESERVOIR STARVING THE PUMP. IF CUSTOMER RETURNS , I'LL LOOK INTO IT...	11
	2002 Chevrolet Tracker 2.0L heat VIN: 2CNBJ13C22 I just want to start out saing sorry for taking so long to post a fix i have just learned that the customer had taken the car to the dealer and that had done all the same tests and nothing could be fixed there. As for the replies they were vary much help to br...	17
	1989 Oldsmobile Cutlass Cruiser 3.3L Cuts out VIN: 2G3AMB1N2K This vehicle has been fixed.Fuel pressure,spark to coil,spark to plugs,vaccum lines all OK.There is no VATS system due to this being an 1989.Oil pressure switch OK.When I went to check it I could see that one of the wires for the crank angle sensor was pulled ...	16
	1998 Oldsmobile Silhouette Premiere 3.4L Driver Information Center VIN: 1GHDX03E1W Thanks guys, sure appreciated the fast response. I double checked serial data from DID (drivers information display) and everything was fine. The customer stated local GM dealer tried a different display and no luck. I replaced it anyways since all wiring was...	3
	2000 Saturn SL2 1.9L Stall VIN: 1G8ZJ5274Y Good morning friends, Sorry about the late posting. I really appreciated the replies. A special thanks to Paul, William, Doug, Robert, Gary, and Wayne. The general concensus was that the complete intake, (throttle body to valves) needs to be very clean. The me...	6

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