GM Automotive Technicians Technical Discussion and Fixes for Jan 20, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1984 Chevrolet K30 Custom 5.7L Steering VIN: 1GBHV34KXH This truck came in with a very bad steering shimmy when a bump was hit at below 35 mph. It would continue to shake untill the truck was almost brought to a stop. The steering linkage was tight. I replace the worn steering stabilizer and the condition was corre...	View
	1992 Chevrolet S10 2.8L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire VIN: 1GCCS14R2N I have this s-10 in here that I jsut did an intake manifold on. Now the problem i am having is the vehicle is running very rough won't idle sometimes or idle will slowly fluctuate it also has a miss in it. checked all my sensors and they seem ok at this time. ...	View
	1994 Chevrolet G20 Chevy Van 5.0L Excessive Emissions, Surge, Misfire VIN: 1GCEG25H9R got a van thats hasn't passed for 6 years, high hc on decel on im31 test / found leak at t-body base gasket and intake gasket leak / replaced gaskets / found ground wire by coolant sensor not bolted down from previous repair / this work brought hc from 15. gpm...	View
	1995 Chevrolet Astro 4.3L No Start VIN: 1GCDM19W5S Customer came in with truck on the hook for no start problem. After pushed in found would crank but no fire. I found after some testing that it had spark and pulse but no fuel pressure. Tested for power and found has blown fuse for ECM1 10 amp fuse blown. chan...	View
	1996 Chevrolet C1500 4.3L Starting VIN: 1GCEC14WOK hi guys have a funny one here.have plenty of spark,have fuel pressure, good cranking,just wont start,just cranks. no codes. i know these engines have a history of bad fuel pressure regulators, but i cant see it under the plenum. any help is appreciated. thx r...	View
	1997 Chevrolet K1500 4.3L Stall VIN: IGCEK14W5V Hi guys and girls.I need a liitle help on this one.Customer came in with complain of periodic stall.We changed the ign switch because of related bulletin.Truck was good for a week and then -I'm back,stopped 3 times on the way home.Engine runs good otherwise.Do...	View
	1997 Chevrolet S10 4.3L frt. axle actuator VIN: IGTDTI9XIV Hi folks,got a 97 Sonoma that won't shift into 4x4.The transfer case is shifting, the front driveshaft turns,but the hubs won't engage.Vacuum is getting to the pot and the cable is moving,evidenced by a click at the front actuator when vacuum is applied to the...	View
	1997 Chevrolet K1500 5.0L Air Control VIN: 2GTEK19M0V Good evening Customer states that this truck has no defrost. He installed new control panel and upon start up smoke rolled out of panel. When I got truck in there was only air coming onto floor, couldn't get it anywhere else. Took Mode Actuator Motor off of ...	View
	1998 Chevrolet K2500 Cheyenne 5.7L fuel gauge VIN: 1GCGK29R0W Truck was towed in for a no-start, diagnose faulty fuel pump. Replaced with GM module assembly, assumed needle fluctuation would be repaired at same time. No such luck. The needle flickers so fast that it appears out of focus, this is exactly the way it behave...	View
	2001 Chevrolet Corvette Z06 5.7L ebcm VIN: 1G1YY12S21 Hi everyone, thanx for listening. We own this car and I have just about all the time in the world to test it so I've spent vast amounts of time with this problem so far, and probably will again. This car has extensive mods e.g. stroked LS6 (382 ci), much head ...	View
	2001 Chevrolet Silverado 2500 6.0L transfer case VIN: 1GCHK29U51 Hi, i have this problem child that will not go into 4wd. I push the selector swith and it tries to go into 4h or 4lo and then goes back to 2h. if i put into nutral it will try to go into 4lo but will click and stay in 4h untill you turn the ignition off. I am ...	View
	1994 Geo Prizm 1.6L brakes/abs VIN: 1Y1SK5365R this geo has an abs problem i know the 2 fr whl speed sensors are bad.but actual complaint is that pedal gets extremely hard and car barely stops.i did experience this 1 time and it is exactly as customer states,has anyone run into a problem like this where th...	View
	1996 GMC Pickup K1500 5.7L Excessive Emissions, Poor Idle Quality, Misfire Customer called said his truck was mis-firing , with check engine light on . By the time he got here it was running fine . pulled codes - found random misfire and #1 o2 sensor.02 sensor failed test-replaced and replaced dist.cap.Cap looked ok,but replaced due ...	View
	1999 GMC Jimmy SL 4.3L transfer case Customer came in with a bad clunk/bang when shifting from 4 hi to 2wd. This is the only time it does it. Doesn't matter how fast or slow you're moving. No codes in the TCCM. The vacuum switch on transfer case was stuck so I replaced it. Still clunks. Tested th...	View
	1999 GMC Sierra 1500 SL 4.8L Engine oil contaminated VIN: 1GTEK14VXX This truck was referred by a local Service Station {Not to many of those left}. This might be coincidental but he took it in because he noticed check engine light was going on and off. The service station found water in the oil and did an oil change. about one...	View
	1999 GMC C-Series Topkick C6H042 7.4L Excessive Emissions, Misfire VIN: 1GDG6H1D6X Hey guys: This truck was brought to me after having been turned away from a heavy truck(GMC)dealer and a different shop. It has failed the idle portion of the emission test on hydrocarbons, but passed all other parts. It has a catalytic which seems to be funct...	View
	1998 Pontiac Sunfire SE 2.4L abs system VIN: 1G2JB1241W test drove car and confirmed complaint of abs system mal-function. abs cycles on dry roads. scan abs-no codes data stream shows rr wheel sensor at 3-10 kph slower than the other 3 wheel speeds no other obvious problems found	View
	2000 Pontiac Sunfire SE 2.2L abs Hi All I have this sunfire that's not adding up. Keeps setting open codes for the rt frt speed sensor.I did find a break in the wire at the connector of the speed sensor but this did not fix it. But get this with the scanner hooked up on a road test it may or...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1992 Cadillac Seville 4.9L Pass Key VIN: 1G6KY53BXN This Cadillac Seville had the VATS (Vehicle Anti Theft System) system. The problem (although the local GM dealership which had made us the new key denied was possible ) was in fact THE KEY. It had been programmed with the wrong resistance pellet. Once we went ...	23
	1995 Cadillac Seville STS 4.6L rear level control VIN: 1G6KY5291S Thanks for taking time to reply, The fix was the wiring to the rear level control sensor, DAVESCARCARE hit the nail on the head. After I faxed the wiring diagrams and all of the info gathered from IATN the technician was able to find the open in the harness. T...	3
	1958 Chevrolet Impala Conve 348CID Fuel Pump Push Rod Thanks to all the guys that responded. The answer is 5.750 X .500. for the push rod. The problem was that the new style pump, which was on the engine when I got it, might have run it but I don't know if it is so. The fix was to get the old style pump (with the...	8
	1988 Chevrolet K2500 Cheyenne 5.7L Hesitation, Cuts out, Stall, BackFire VIN: 2GCFK24KJ1 Thank you for getting us back on track. We had orgionally check the grounds at the thermostat housing. We went back and rechecked our grounds and found a stud which was not making good contact. We cleaned the stud and replace an eyelet and problem fixed.	10
	1990 Chevrolet C1500 Cheyenne 5.7L a/c control head VIN: 1GCDC14K3L after a little more research i noticed that this vehicle did not have a high pressure switch but i didn't find a plug for it, the high pressure switch wire was grounded to the intake manifold. thank god its done, thanks for all the replies, your all a great he...	13
	1994 Chevrolet Camaro 3.4L Misfire, vibration VIN: 2G1FP22S6R Well Thanks again to IATN techs. I was thinking that this was caused from internal engine problem like valve springs or cam. I can't confirm this at this time due to customer but i got some new info to check and all is good outside engine. So I'm reccomending ...	12
	1997 Chevrolet Corvette 5.7L codes VIN: 1G1YY22G9V thank you to the 2 gentlemen that responded,I was told the code 1571 traction control problem is usually set on these vehicles when scanning for codes,I got in touch with a buddy at GM that went one step furthur and said that if you scan for codes with your fo...	3
	1998 Chevrolet Blazer 4.3L Intake VIN: 1FNDT13W2W Thanks again for all your help on this one. We ended up pulling the head on the side we were getting water in and found that the number 5 cylinder had a crack in it! I've actually never seen that. I'm not sure what caused it, although our theory is it froze. T...	16
	2000 Chevrolet Cavalier 2.2L wont move VIN: 1G1JC524DY found input shaft broke inside trans thanks for all the replies this site is great	14
	1998 GMC Safari SL 4.3L lifter VIN: 1GTDM19W8X I would like to thank everyone for there help. The fix for the noise was a rebuilt motor. One of the wrist pins had some wear on it causing it to knock when the engine warmed up. The cam bearings also showed minor wear, but I do not think it was enough to caus...	7
	1996 Oldsmobile Aurora 4.0L all windows innop VIN: 1G3GR62C3T THanks for graet and accurate responce, the black wire-main ground for switches in drivers door jam area was broken and had a previous repair done allready in same area(this stopped all window switches from responding), I had initially, grounded this wire from...	5
	2001 Pontiac Grand Prix SE 3.1L MIL Lamp on VIN: 1G2WK52J94 Hello again, Thank you for your help. The fix was a broken wire(ppl/white) in the harness hear the trans gounds, the main harness for the pcm. The pcm is in the air filter box. The wire was the signal one. Data out of o2 good signal, near pcm fixed signal. I...	8
	1996 Saturn SL2 1.9L Hesitation, Lack of power VIN: 1G827FJ329 Thank you for all the replies. I put teflon tape on the threads, a rubber and an aluminum washer on the knock sensor and test drove. Engine performance returns to normal operation. Special thanks to Ray [...]. in S. Cal. who lead to the fixed. Iatn is a great reso... Trouble codes: P0326 (Too Much Knock Present).	3

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