GM Automotive Technicians Technical Discussion and Fixes for Jan 26, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1983 Cadillac Seville 4.1L No Start VIN: 1G6AS6987D We've serviced this car since new and customer has never skimped on repairs & service. Spark while cranking no fuel pulses, disconnect 4 wire HEI connector then we have fuel pulse but no spark. Jump ground & ref wires at HEI connector and it starts & runs. The...	View
	1999 Cadillac DeVille d'Elegance 4.6L MIL Lamp on VIN: 1G6KE54Y9X Hey guys, I need help with this one. This vehicle keeps coming back about every two months with code P0300. History codes tell me random cylinders are misfiring, different ones each time, and also long term fuel trim was at +30 bank one and +15 bank two when c... Trouble codes: P0300, P0603	View
	2002 Cadillac Escalade 5.3L Misfire, MIL Lamp on VIN: 1GYEC63TO2 I'm hoping some of you Cadilliac techs may have seen this one before. Although this is a Chevrolet engine, I have never seen this one before. It has history miss fires on cyls #1, 3, 5, 7. You can watch the live miss fire counters, and occationally you will se... Trouble codes: P0300	View
	1986 Chevrolet Celebrity 2.8L No Start VIN: 1G1AW19W0G Customer brought in this car and said it was running poorly, when we got to it there was a dead battery, replaced battery and the car ran great. Called customer and she wanted more work. Car had time to cool down, and would not start. all systems check out ok,...	View
	1992 Chevrolet Camaro RS 5.0L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1G1FP23EXN hello and thank you all for taking the time to read my problem. this car runs great the hole time you drive it. it doesn't matter if you drive for 10 min. or 10 hours, but as soon as you stop and shut it off for about 20 min and resart it, there is very little...	View
	1995 Chevrolet Monte Carlo Z34 3.4L tcc VIN: 2G1WX12X1S Hello all...We have this Monte Carlo that will not lock the TCC up. The trans was rebuilt by Russ Moore in Fortewayne, Indiana. We can controll the solenoid with our Tech 2, and we can hear it click, but it will not apply. My tech is saying that it's internal,...	View
	1998 Chevrolet Astro 4.3L steering pump and power brakes VIN: 1GNDM19W1W replaced steering pump because it was leaking at front seal. after we installed the new pump ended up with no power steering or power brakes. this vehicle is equiped with hydroboost for the brake system.	View
	2000 Chevrolet Suburban 1500 5.3L battery VIN: 1GTEC14W0Y good day to all, we have this truck that on occasions the cruise and the high beam indicator lights come on and we have a 50 mill amp draw , the radio fuse in the underhood junction block provides battery power to cluster and the message center. when the fuse ...	View
	2000 Chevrolet Silverado 1500 5.3L ABS Module VIN: 2GCEK19TOY This vehicle had the ABS light come on. It also has had the red brake warning light come on twice. The ABS light will come on at start up and go out like it always did. Once the vehicle is driven more than 20 or 30 feet the ABS light comes on, and stays on. Th...	View
	2000 GMC Savana 1500 4.3L Rear Wheel Speed Sensor VIN: 1GTEG15W7Y Rear brakes, axle seals and wheel cylinders were replaced about six months ago at 98,000 miles. It was noted then that the vehicle had a pull that we thought was related to an ABS issue, but further work was declined at that time. It came in recently to have t...	View
	1986 Oldsmobile 98 Regency Brougham 3.8L No Start VIN: 1G3CW69B9G Hello there fellow techs. Hope your new year is going well. I have a customer called me as he drove it home one day, then the next morning went to start it up, and no start. I checked for spark, no spark. Put the scanner on it, and no codes. Checked for spark,...	View
	1996 Oldsmobile 98 Regency Elite 3.8L 1-2 ss1 VIN: 2GCEC19W21 The customer is bringing the truck back tomarrow.I have the snappy just wondered if I can get more of a jump on this.I've cked the upshift when driving on my scanner and it works untill I start the truck.?	View
	1998 Oldsmobile Cutlass 3.1L No Start, Cuts out, Stall VIN: 1G3NB52M0W Ok, here it is. The vehicle came in crank no start with no power to the fuel pump module. We found no power to the ecm from the ignition switch. We then got down to the ignition switch, and the durned thing locked up. We replaced the ignition switch and lock c...	View
	1990 Pontiac Bonneville SE 3.8L blower motor VIN: 1G2HZ54C8L Hello all. First time car is in my shop customer states that the blower is inop. This car has climate control which uses the blower module located under the hood on the blower box, Checked power and ground. ok Powered up blower motor with the connector disconn...	View
	1995 Pontiac Grand Prix SE 3.1L anti theft system VIN: 1G2WJ52M0S turn key forward all lights come on, security light stays on steady, head lights do not dim when trying to start, as if anti theft system is not getting signal	View
	2000 Pontiac Sunfire SE 2.2L Stall, MIL Lamp on VIN: 1G2JB124XY customer complaint of ses lamp coming on and at times car stalling and not restarting. vehicle towed in but started right up found freeze frame data records for po420 and data display readings of coolant sensor at (-40 deg), vehicle speed at (37 mph), maf at (... Trouble codes: P0420	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Buick Regal Gran Sport 3.8L Magnet VIN: 2G4WD54L5M Thanks to all who replied. We have not yet fixed this problem. The consensus is that this looseness is normal and most who have done one of these have used some sort of epoxy or sealer on the magnet if only to help them sleep better afterward. One respondent s...	6
	1992 Cadillac Seville 4.9L Trip Computer and A/C Controls VIN: 1G6KY53B8N I should have looked harder! All the information I needed to fix this problem is indeed in my Mitchell repair information located in the accessories section, Instrument cluster, and Radio. Given the specifics, I was able to isolate the instrument cluster as de...	3
	1993 Checker G20 5.7L abs module VIN: 1GBEG25K9P thank you for all the replies. i did get some useful information for this vehicle but unfortunatly the customer has not been able to give the vehicle to us again to do this testing. we hope to be getting it back in here shortly to finish the repairs. thank you...	5
	1995 Chevrolet C2500 Suburban 7.4L radio VIN: 1GNGC26N6S thanks to all fellow iatn members who responded to my help request. the intermittant radio problem went away after i had done some investigating and digging around in vehicle. had a couple of members state that problem could be in right front kick panel where ...	8
	1997 Chevrolet Malibu 2.4L water pump First I want to thank all the guys that responded to my problem what we did was change the oil and put in straight 30wt. oil and added maurys oil addative and most of the noise went away customer was satified thanks again ken [...]	11
	1998 Chevrolet K2500 Cheyenne 5.7L fuel gauge VIN: 1GCGK29R0W Checked gauge accuracy with Mastertech, inreases in 10% increments correctly, still with oscillations, although from 1/4 tank to empty, less extreme movement. The PCM had the current calibrations in it, no need to reprogram. Power and grounds check out fine an...	10
	1999 Chevrolet S10 2.2L tcc VIN: 1GCCS1440X We installed just the TCC valve and its springs from the Transgo shift kit. The TCC is working normally with no difference felt in TCC engagement. Here are some of the posts: scott hi, you can just change the valve in the trango kit, but it s much better t...	11
	2001 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHKK2314 We feel the problem is in the filter housing primer pump area. the filter assembly is sold as a complete filter assembly with a list of $515 from dealer. The owner reported no problems when the weather warmed up so he does not wish to invest for now. We did or...	3
	1999 GMC C-Series Topkick C6H042 7.4L Excessive Emissions, Misfire VIN: 1GDG6H1D6X Hey guys: Here is the fix I found for the GMC 7.4. When I checked the pre-cat readings, the HC was only being reduced by 7% at idle. I ordered a new cat and installed it; the vehicle passed. I had assumed that the cat was ok because of the low 2500rpm readings...	8
	2000 GMC Sierra 1500 SL 5.3L steering wheel shaking VIN: 1GTEK19T7Y Wow. Thanks to all who replied. I recieved twenty-three replies to this request and all contained valuable information. The overwelming response was to rotate or replace tires. The customer decided to replace them, so we installed four new tires and the shakin...	23
	1992 Pontiac Grand Am SE 3.3L No Start Thanks for the help people..Sunny from Ontario gave me the idea and low and behold it was a corroded connection. Thanks for the help once again.	19
	1994 Pontiac Firebird Formula 5.7L Excessive Emissions VIN: 2G2FV22P8R After many hours trying to figure out why the PCM will not command the EGR switch to supply vacuum to the EGR under ASM conditions, I decided to cut my losses. GM Techline even stated I should have vacuum at ant speed over 3-4 MPH, the maintime I was getting v...	8

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