GM Automotive Technicians Technical Discussion and Fixes for Mar 28, 2005

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Open Help Requests for GM

	Help Request	Answers
	2000 Buick Park Avenue 3.8L ride control VIN: 1G4CW52K4Y Customer came in for transmision service, brakes, and tire rotation. I raised vehicle, however I did not support the rear control arms, and after I lowered the vehicle the rear shocks inflated and I would not come down. Called dealer and was told to disconnect...	View
	1990 Chevrolet Camaro Iroc-Z 5.7L Hesitation, Surge VIN: 1JCCF87E2F While driving at any point at any speed if you depress throtle to 3/4 or full it will hesitate surge and then stumble. It will smooth out at [...] or if you decrease throtle. tps sweep was ok. map sensor was ok. o2 sensor was ok. timing was set to 9 degrees... Trouble codes: 45 (over rich)	View
	1990 Chevrolet Celebrity 3.1L Poor Idle Quality, Surge, Cuts out, Stall VIN: 2G1AW84T7L this car will stall coming to a stop, or sitting in the shop idling will intermitantly stumble for a split second i belive i have found the problem the vacumne reading fluctates between 21 and 15 smoothes out at 2500 i don't think the map has enough vac to r...	View
	1991 Chevrolet Corsica LT 3.1L Poor Idle Quality, Hesitation, Stall Hello everyone. I am once again working on another gm 3.1L engine. You know they're great until an electronic problem occurs. Then I have to break out all my resources to figure them out. Anyway, this engine has lots of power and runs well. It had a tip in hes...	View
	1992 Chevrolet P30 6.2L no overdrive VIN: 1GBKP32J1N I have a 92 Chev P-30 van with a 6.2 Liter diesel and a 4l80e transmission. The truck came into the shop for no overdrive. I verified the condition and my scan tool showed a code 22 low TPS signal code. The TPS shows 0.00 volts and TPS percent is at 35%. With ...	View
	1994 Chevrolet C1500 Suburban Silverado 5.7L abs,ect VIN: 1GNEC16K9R Im working on a 1994 suburban 1500.The problem is that it pulls hard to the right during braking.The suburban has new calipers,brake pads and fairly new brake hoses and 2 new rotors.I did a runout check and it was fine.I also made sure the rear drums were adju...	View
	1996 Chevrolet S10 2.2L compresser VIN: 1GCC8144XT Hello all. What i have on this one is no ground for the A/C relay. I also have a leak to deal with. This came in from a car lot. The system was low so I went to charge the system. The compressor stayed inop so I have done the power and ground checks. When I gr...	View
	1997 Chevrolet C3500 Cheyenne 7.4L vent system VIN: 1GBKC34J4V have bad fuel smell in cab checked for signs of leaks,did not find any fuel smell only in cab,vent canister line from tank has fuel smell,took off canister to check for gas none in canister thanks mike	View
	1997 Chevrolet Cavalier 2.4L No Start VIN: 1G1JF123TV Hi.We have exhausted all efforts in trying to fix this car. I have a no spark no injector pluse except sometimes when i bump start key 8-10 times then I will get spark & pluse. When engine does try to start it as if it has a cross fire I have replace ckp senso...	View
	1997 Chevrolet K1500 Suburban 5.7L Hesitation, Surge VIN: 3GNFK16R8V I need some help with an intermittent problem on this 'burb. Intermittently it will surge, hesitate and lose power. I have felt this once, but I didn't have any test equipment connected. It did it for about a mile, I stopped at the shop and it was still runnin...	View
	1999 Chevrolet Cavalier Z24 2.4L timing chain VIN: 1G1JF12T5X car came in with a failed water pump. i replaced the water pump [which was scraping on the impellor housing] and reassembled the engine. the timing chain still made noise, so i installed a new kit [which included new gears, chain,guides,and tensioner.]also cha...	View
	1999 Chevrolet KODIAC 7.2L park brake alarm module VIN: C7XJ105931 Started with park brake alarm going off.Had moisture in system, so we flushed system.All ok for 2 days and alarm lights off again.Noticed excessive travel on actuator cable,replaced and adjusted park brake shoes.Once again, ok for a day or two.Since then the p...	View
	2000 Chevrolet Suburban 1500 LT 5.3L Poor Idle Quality, MIL Lamp on VIN: 3GNEC16T7Y came in on hook. No start. Pcm b fuse blown. Tac motor shorted. Now runs but sets TPS code p1220a and trips low power light and will not go over 2000rpm. Heres the sticky I can clear codes and drive with no problem or SES until I restart or just turn key back ... Trouble codes: P1220	View
	1996 Geo Tracker 1.6L Surge, Cuts out, MIL Lamp on VIN: 2CNBJ1267T Customer complaint of vehicle surging while going down road. Does it more when warmed up.TPS has been replaced several times over last couple years. Code P0510 always comes back after several months and starts running the same. Noticed when driving that on sca... Trouble codes: P0510 (Closed throttle position switch circuit), P0400 (EGR System)	View
	1996 GMC C2500 Suburban 6.5L Misfire VIN: 1GKGKZ6F4T Hello, I have this GMC Suburban 2500 here with a tricky miss, what it does is while driving it occasionally gives a puff of black smoke and loses power, but not really bad just enough to cause alarm to the driver. he thinks it might be a sign of something fail...	View
	2001 GMC Jimmy SLE 4.3L MIL Lamp on VIN: 1G1CDT13WX This vehicle does NOT have an air pump. Does anyone know why I should get this code and CEL? Trouble codes: P0410 (Secondary air system)	View
	2000 Hummer H1 6.5L Excessive Emissions VIN: 137ZA8434Y Hello group, -mixture of black & grey smoke (mostly just after startup) -vehicle performance is normal -seem to hear a knock from engine that is tied to variable rpms (it comes & goes), The oil is approx 1 to 2 qts. low, we are about to do an oil change. My f...	View
	1994 Oldsmobile Cutlass Ciera 3.1L shifting into park VIN: 1G3AG55M7R Having problem after you take it out of park and go into any other gear and back into park, it catches in reverse. It's more pronounced if you go straight to reverse and back to park. If you go to park to drive and back up, it catches at reverse and will not g...	View
	1994 Oldsmobile Cutlass Ciera 3.1L in park VIN: 1G3AG55M7R Having problem after you take it out of park and go into any other gear and back into park, it catches in reverse. It's more pronounced if you go straight to reverse and back to park. If you go to park to drive and back up, it catches at reverse and will not g...	View
	1995 Oldsmobile Aurora 4.0L engine VIN: 1G3GR62CXS car has loud bang going into reverse.	View
	1997 Oldsmobile Aurora 4.0L High idle speed. VIN: 1G3GR62C0V This vehicle does not appear to have any vacuum leaks. Scan data suggests the pcm has run IAC to stop. RPM can be raised and lowered with scanner but will not drop below 1050. If vehicle is put in gear the rpm will drop to around 850. With iac removed and vacu... Trouble codes: P0507 (Idle speed high.)	View
	1998 Oldsmobile LSS 3.8L MIL Lamp on hello, i have this olds LSS came for mil light on, had random misfire code. found misfire and it ok after the tune up. plugs,wires, pcv vlace and motorvac was done, no mil light after the repair. week later mil light is on again and has code p0401 insufficent ... Trouble codes: P0401 (insuffisent egr flow detected)	View
	1995 Pontiac Sunfire SE 2.2L No Start VIN: 1G2J85245S HI Guys! Well I have another one from another shop who couldn't get this thing started. They have just about put everything new on it and gave up. From what I understand this car came out from a flooded area but it looks pretty clean. At first I wasn't gett...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Chevrolet Astro CL 4.3L Poor Idle Quality, Stall VIN: 1GNDM19W7S I don't have the fix for this van. The coustomer took the van. They didn't want to spend any more money. IF the van comes back i will let you know what happens. Thanks for youe help!!!	19
	1995 Chevrolet Tahoe 5.7L Cuts out VIN: 3GNEK18K2S This vehicle is back on the road again. As I said, I was posting this for another shop. He read all the responses and just installed a new EGR valve. Truck is running great again. He didn't test the old one the way several of you suggested, instead he just rep...	13
	1997 Chevrolet C1500 Cheyenne 5.7L Misfire, MIL Lamp on VIN: 1GCEC19R3V thank you for the help. we went through checking everything once again. found nothing out of spec. however we did find a loose terminal connection to the injectors including #7. we repaired the terminals and we have not had an issue since. the problem is more ... Trouble codes: P0300, P0307, P0302.	14
	1999 Chevrolet Cavalier 2.2L convertor VIN: 1G1JC5249X I had to give up on this one. Scoped the tcc solenoid, was drawing 400ma. When the solenoid was out of the vehicle it would hold 120psi air pressure when energized. I could find nothing wrong with the valve body or auxillary valve body. Unless both converters ...	6
	1998 GMC K1500 Sierra SL 5.7L Misfire, MIL Lamp on VIN: 2GTEK19R8W First off thanks to all the helpful information i did check runnig compession and it was within 20% of cranking compression,I also put a gm dist cap on.I did check for vac.in dipstick tube and there was none.I checked the fuel pressure regulator again and it w... Trouble codes: P0300.	25
	1991 Oldsmobile Cutlass Supreme SL 3.1L No Start, Poor Idle Quality, Misfire VIN: 1G3WS54T7M I isolated the injector harness and ohm tested.I found the injector reistance to be to low. After removing the plenum I tested each injector for resistance. Found two injectors shorting One had only 1 ohm and another had only 4 ohms. All the others were 11 to ...	20
	1997 Oldsmobile Achieva S 2.4L No Start VIN: 1G3NL52T5V Special thanks to everyone who replied to this problem! iATN sure has benefitted me here! What I ended up doing was removing the PCM from the vehicle and leaving the car outside overnight with the PCM in our warm office. I connected the 'warm' PCM to the cold ...	8
	1999 Oldsmobile Alero GL 3.4L steering pump VIN: 1G3ML52E4X Thanks to all who replied. Replies began with doing nothing because some pumps just make noise for a while. I was told Cardone pumps say to ignore any noise for the first 500 miles. Some suggested a broken baffle in the pump, Low trans fluid, binding steer...	8
	2000 Oldsmobile Bravada 4.3L Electronic VIN: 1GHDT13W4Y Hello and Thanks for the response, When the vehicle came back in we wnet right to the heater core and found that we were not getting proper flow. Thanks to Roger and Mark that both suggested check for proper flow. We flushed the core and everything was fine....	3
	2001 Pontiac Grand Am GT 3.4L starting VIN: 1G2NW12E71 Thanks for the help guys, but the problem was a burnt resistor wire in the security system, Had to buy a resistor and repair wire.	8
	1996 Saturn SL1 1.9L Mechanical VIN: 1G8ZH5288T greetings.. thanks to all those who helped me on this problem. the suggestion of pinching off the lines one at a time really helped me out the car does not have abs on it. after pinching off the lines i discovered problem was in the rears. I replaced the rear ...	5

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