GM Automotive Technicians Technical Discussion and Fixes for Mar 11, 2005 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick Park Avenue 3.8L computer VIN: 1G4CW52K7S Problem no communcation unless you ground computer to neg battery terminal. have checked all grounds by starter under ignition module. The outside of the computer has postive power but if you ground the outside to the negative it starts and runs fine. Pulled a...	View
	1998 Cadillac Catera 3.0L No Start VIN: W06VR52R5W I'm Posting This For A Friend Of Mine. It Appears That The Vehicle Came In Running Rough, While @ The Shop It Stalled & Has Yet To Restart. He Pulled The Plug Wires From The R.H. Bank To Check For Spark And All The "wells" Were Full Of Oil. He Is Unsure How ...	View
	1992 Chevrolet Step Van P30 6.2L Cooling Systems VIN: 1GTJP32J7N 3 weeks ago van came in overheating, found head gasket leak, replace head gaskets , sent heads out and came back ok. van back know running hot on gauge, did not beleve gauge, radiator was not hot thermastat was not hot, neather radiator hose hot, replaced t st...	View
	1994 Chevrolet Lumina 3.1L Hesitation VIN: 2G1WL54T5P Help on this one would be great. The car came in for a run problem worse when cold. Had a constant misfire under load and tip in hesitation. Performed the usual scan,ignition check,etc. Vacume gauge showed glitch traced to round cam lobe on #1 intake. R&R cam ...	View
	1995 Chevrolet Camaro Z28 5.7L No Start 95 5.7 in a 54 jag, ran good for 2 yrs, developed an occasional hard/no start, when it does, it starts on 4 cyl or wont start, there is no injector pulse on 1 or both banks, then most of time , starts and runs great, has a dakota digital key bypass (just repla...	View
	1997 Chevrolet Blazer 4.3L Hesitation, Misfire, MIL Lamp on VIN: 1GNDT13W0V Customer brought vehicle to us with a complaint of no power. Vehicle boggs down under load. checked for codes and found po100, po300, and po420. checked MAF sensor operation and found B+, referance and activity to be ok. checked fuel pressure and found that to... Trouble codes: P0300, P0420, P0100	View
	1997 Chevrolet C2500 Suburban 5.7L Cuts out VIN: 1GNNGC26RX Hello Gents. This is a head scratcher which has come my way from another shop. They have limited test equip and experience and their problems become mine. Of course as most techs, we like a good challenge although sometimes we get more than we bargained for. W...	View
	1998 Chevrolet K1500 Cheyenne 5.7L Park Lamps VIN: RBT11W0256 This truck came in with complaint of not being able to shut off the parking lights. I got in the vehicle and could smell a burning electrical smell with no smoke. I removed the headlamp switch and the park light remained on (dash lights included). I have check...	View
	1998 Chevrolet Blazer 4.3L Cuts out, MIL Lamp on hi guys , i have this s-10 blazer with a 4.3 w motor.the main problem is that it will go into fuel cutout at 2100 rpm.it also wont learn a crank relearn. it set a cam sensor code , but i replace it and check the cicuit and all seems fine.. it looks like it had... Trouble codes: P0339	View
	2001 Chevrolet Impala 3.4L lifter noise VIN: 261WF55E91 Vehicle has valve train or lifter noise in am startup after sitting overnight. Low end is quite. It appears that no oil is getting to the rocker arms. Oil pressure builds immediatly and is in spec- cold 40psi idle, 55psi 2500 rpm hot 28psi idle, 52psi 2500rpm....	View
	1996 Geo Metro LSi 1.3L engine VIN: 2C1MR5294T 96 metro 4 cyl no-start. towed in. customer states intermittent no-start. we had replaced the timing belt 8 months ago as preventive maintenance. while cranking, i noticed that the crank pulley was wobbling and i flound that the pulley bolt was gone. i checked...	View
	1993 GMC Jimmy SLE 4.3L Mechanical VIN: 1GKDT13W5P This is a Non PWM 4l60-E trans. Rebuilt the thing due to slipping in 1st gear. Now that it is complete it doesn't fully engage into any commanded forward gear (commanded with scan tool) when warm either taking off from a stop or when switching to drive. It doe...	View
	2003 GMC Sonoma SLS 2.2L Headlights VIN: 1GTCS14H73 The vehicle we have has a problem with the headlights and tail lights that continually burn out. We have replaced the headlamp bulbs numerous times, we have also had to replace the connectors for the bulbs because they have melted. We checked the voltage to th...	View
	1995 Pontiac Sunfire SE 2.2L Excessive Emissions VIN: 41SS839546 Hello, this is my own car. Having alot of trouble getting this to pass emissons. . The Limits are as follows. Idle 200 HC. and CO 1.00 Cruise HC 66 and Co at .37. When I first got the car 3 months ago the first thing I did was put a cat on it because the prev ...	View
	2000 Pontiac Montana 3.4L No Start VIN: 1GMDX03EXY Hello Gentlemen! Thank you SO much in advance for your help! This is what I have: NO START, good spark, good fuel pressure, but injectors will not fire. Good power to injectors (see above), injector resistance seems reasonable (#1-11.7 ohms,#2-11.6, #3-11.6, #... Trouble codes: P0440, P0300, P1446, P????, B1009, B2734	View
	2001 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NF52T21 customer says car does not start and throws code 1632. starts ok after a while. this is the second time this has happened. the first time some one else prformed the reprogramming procedure and he had no problems for two. months. i'm going to look at this car t... Trouble codes: P1632	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Cadillac DeVille Concours 4.6L monitors not set VIN: 1G6KF5294T Thanks to all the techs that replied to this. All were good ideas and we tried all of them. Problem turned out to be we were trying to fix a car that was not broke! Thanks to Daniel we learned that this car was equipped with Canada OBII emission standards. D... Trouble codes: P0135.	4
	1989 Chevrolet Astro CL 4.3L Stall, Misfire, Poor Fuel Economy, Back firing VIN: 1GNDM15Z2K HI Again! Yes I have gotten this one fixed also, at least I pray. You all had some very good suggestions. In this particular van it seems that someone had attempted to repair some wires in the harness, taped and rewrapped them inside the plastic loom. Upon... Trouble codes: 42 (EST error), 43 (ESC failure), 33 (map), 32 (egr).	20
	1992 Chevrolet Cavalier Z24 3.1L all gears VIN: 1G1JF14T9N Howdy fellers! Well, ya all can stop laughing now. The Cavalier is back on the road, shifting just fine. Yes, it was the filter. Although there wasn't a trace of metal in the pan, I did find the fluid as thick and black as I like my coffee. We figure that ...	9
	1995 Chevrolet S10 4.3L battery discharges at random VIN: 1GCDT14Z2S thanks for all the input, but bosses mom won't even let us kill the radio to see if it is the cause. replaced the fp relay and the oil press sw. it still kills the batt. she 'just can't drive without a radio'. Guess it's easier to have use come jump it every 2...	18
	1995 Chevrolet Blazer 4.3L no 1st gear sorry guys for the wait, this vehicle was involved in an accident shortly after the post. i have been waiting for it to be fixed.i think the customer is going to claim this shifting problem on the accident. i wonder how far he will get?	6
	1996 Chevrolet K1500 Cheyenne 5.0L MIL Lamp on VIN: 1GCEK19M1T After testing and monitoring just about everything and three techline phone calls we decided to try a new computer, because nothing else looked bad. It's been a few weeks now and the light has not come back on. The VCM may have been damaged by the shorted TCC ... Trouble codes: P0172, P0175 (B2S1 rich).	11
	1997 Chevrolet C3500 5.7L heater blower motor resitor VIN: 1GBJC34R7V I want to thank everyone that took the time to reply. I also felt that 17 amps was high. I jumped the diode on the resistor to make motor work in all speeds and this is what I got for amp readings low 2 amp M1 8 amp M2 13 amp high 17 amp What I was looking for...	11
	1998 Chevrolet K3500 Cheyenne 5.7L fuel tank VIN: 1GBHK34R8W thanks to all who replied,i replaced the tank,checked the line to tank to canister-ok,pulled cap off vent on canister and bingo-full of dirt,i cleaned out vent and suggested replacement and new / crankcase vent,one question,this truck doesnt have a pressure se...	16
	2001 Chevrolet Malibu 3.1L Poor Idle Quality VIN: 1G1ND523X1 How many time can i bang my head against the wall!It turned out to be a bent wire terminal on the front O2 sensor.Thanks for all the help.	9
	2001 Chevrolet Malibu LS 3.1L Engine Noise VIN: 1G1NE52J91 Thanks to everyone who sent me emails about the problem. We removed the engine and tore it down. Found the center cam bearings had spun in their bores. Replaced the cam bearings, reinstalled the engine and the noise is now gone. Thanks.	15
	1997 Pontiac Grand Prix GTP 3.8L Unknown VIN: 1G2WP1219V soory guys customer did not want to fix vehicle, and took it out of the shop unrepaired, I do want to thank those of you with the helpful advise. too bad i didnt get to use any of it but thanks nonetheless Thanks Brian	7
	1998 Pontiac Bonneville SSE 3.8L supercharger VIN: 1G2HZ521XW I checked the oil in the supercharger and it was a little low so I went ahead and changed the oil and rechecked everything and the noise seemed to quiet down. Spoke with the customer and he stated the boost gage has operated that way since the car was new.	7
	2001 Pontiac Grand Prix SE 3.1L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1G2WK52J31 Well everyone was on the same track with a problem in the head. indead this was the case. i did a cylinder leak down test and found that the cylinder in question was 100% leak down and all the rest were below 60%. i then used the smoke machine and put smoke in... Trouble codes: P0303 (cylinder 3 missfire).	9

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