GM Automotive Technicians Technical Discussion and Fixes for Feb 17, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1991 Buick Riviera Luxury 3.8L pass key VIN: 1G4EZ13C8L hi im to the end of my trail.The vechicle has on crank. I ground the black/yellow at the pasas-key relay and have engine crank no injector pulse. Ohm the key first and than at the modual all points are reading the same ohms in all key posisions. replace pass-k...	View
	2001 Buick Century Custom 3.1L wipers VIN: 2G4WS52J51 These wipers began parking in the full up position. I removed the hood & cowl panel & watched the arm function. In pulse it works correctly. When parking, the motor reverses and leaves the wipers up. I replaced the arm assembly per the enclosed instructions an...	View
	1988 Chevrolet G30 Beauville 5.7L No Start, MIL Lamp on VIN: 1GAFG35K9J The van i am working on is a 1988 chevy full size van, It will not start unless you hold the gas pedal to the floor, upon starting it sets a code 15 i checked for 5 volt reference that was good, so i checked ground and that was good,i first replaced the sensor... Trouble codes: 15 (coolant temp)	View
	1993 Chevrolet K1500 Suburban 5.7L all shifts Hello guys, I have a weird one here. We first drove the vehicle in the snow which made it difficult to drive. The whole time the vehicle would not duplicate the customers complaint. Now,after 4 days the customer came back with the evident problem upon our test...	View
	1994 Chevrolet S10 2.2L Drive Range VIN: 1GCCS1442R I just started overhauling transmissions in the fleet and am still onthe learning side of it. I just overhauled this 4L60E about 300 miles ago. The trans shifted excellent upon completion. Employee brought truck back yesterday and said it lost movement in driv...	View
	1995 Chevrolet C1500 Cheyenne 5.7L No Start VIN: 2GCEC19K8S I’ve never seen this before. I hope someone can help us out. After sitting for a few hours this thing will not start. I have had it happen long enough to find that it has no spark. Owner says he can tap on the dist. and it will start. I have replace the module...	View
	1997 Chevrolet Blazer 4.3L gauges fuse VIN: 1GNDT13W2V Hi group! This truck does not charge and the gauges fuse blows shortly after being started. Disconnected alternator with no change. This ia a 10 amp fuse and when checked with my amp probe it pulls 30 once started. this fuse feeds quite a bit of different thin...	View
	1998 Chevrolet Cavalier Z24 2.4L foglamps VIN: 1G1JF12T4W Hi all, have this cavalier with inop left front lowbeam headlamp. I know that these have quite a problem with the front wiring along bumper to washer bottle area. But this cavalier appears to have dealer installed fog lamps.(cust bought brand new ,never been a...	View
	1998 Chevrolet K1500 Cheyenne 5.7L Misfire VIN: 2GCEK19R8W Help Guys! 1998 Checvy Z71 350 brought in missing on cylinders 5 and 7. Performed standard tests and results below. Compression 5-170 7-175 Fuel pressure - 61PSI Injector pressure drop test -OK Swapped - Cap(2),rotor,plugs. Removed plenum and commanded inject... Trouble codes: P0300 (Cylinder Misfire)	View
	2000 Chevrolet Impala 3.8L Battery VIN: 2G1WF55K7Y Customer complaint indicates that vehicle will not start intermittently after sitting overnight, dead battery, slow cranking. I have had the car for approx. 5 days and it has not been acting up and starts fine in the mornings. Battery tests every morning indic...	View
	1991 GMC Sonoma SLE 4.3L No Start VIN: 1GTCS19Z0M This is a weird one. When trying to start this vehicle it will crank for an indefinite amount of time and the check enine will stay on and it will not start, but after a couple of tries while cranking the light will blink once and the vehicle will start right ...	View
	2001 GMC Savana 3500 6.5L Stall VIN: 1GDJG31F91 I have a GMC van that will intermittently die when letting off the throttle while driving. I have not personally been able to get it to happen to me. The SES light was not on but there was a couple of codes stored which are listed above. This is a good fleet c... Trouble codes: 126 (insuf coolant temp fpr stable oper), 238 (boost sensor 1 open/high), 236 (boost sensor 1 out of range)	View
	1996 Oldsmobile Cutlass Ciera 3.1L Misfire VIN: 1G3AJ55M3T customer brought car in for intake leak and misfire. as we all know 3100's are nortorious for intake leaks. before repairing intake leak we determined misfire which revealed cylinder #3. after inspecting plug wires we seen that #3 wire is arcing thru causing m... Trouble codes: P0301	View
	1999 Oldsmobile 88 Royale 3.8L Surge, Stall VIN: 1G3HN52K9X Need A Little Help From The GM Techs. I Have A 1999 Olds 88 3800 K Engine. If It Idles In The Shop For About 5 Minutes The Engine Starts To Roll At Idle And Dyes. No Codes Found. Scanner Looks Ok. We Cleaned MAP And IAC. Looked At Fix Data And Might Suspect Fu...	View
	1994 Pontiac Grand Prix SE 3.1L Radio VIN: 1G2WJ52M2S Hello good friends at iATN just a little help from you. This Pontiac shows "code" at radio display and looking at user manual I read that owner can put his own code to the Theftlock system. Now here in my country there isn´t a dealer for now to ask if I can r...	View
	1994 Pontiac Firebird 3.4L No pedal VIN: 2G2FS22SXR Dear Group, The Firebird is killing me.It comes to me by way of the car lot next door,the landlord!Original customer complaint, Low or no clutch pedal.Their guy replaced the clutch assembly , and the slave and master cylinder no change.It feels like it has air...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Cadillac DeVille Concours 4.6L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G6KF52Y0R First of all, many thanks to all iatn members who responded to our request for assistance. Although we are new to iatn, we are already using it daily! The Fix-Database is awesome. It's always difficult when you 'inherit' a headache from another location. You... Trouble codes: 137 (loss of abs/tcs data).	12
	1999 Cadillac Seville STS 4.6L ride control VIN: 1G6KY5499X Hello- Got a few replies on this one, suggesting that the problem is in one of the sensors for the struts. However, since I did have a steering wheel sensor code stored in the ABS module and felt that may be related, I wanted to try and actually diagnose the s...	4
	2001 Cadillac DeVille DHS 4.6L heated seat VIN: 1G6KE57Y81 Most replies were correct. Turned out to be an element. It wasn't open but had high resistance. The seat cushion checked fine, both thermistors cheked fine. Seat back element checked at 15-25 ohms. It must have been giving the module the signal to shut off. Bu...	15
	1988 Chevrolet C1500 Cheyenne 4.3L No Start VIN: 1GCDC14Z6J Many of you guys right on the money. the ignition coil was the problem low output when temp below zero.thanks to all that responded.customer happy.	17
	1994 Chevrolet Cavalier RS 2.2L Cuts out, Stall VIN: 3GIJC1147R Thanks for all the input, The fix for this car was I had to replace the IAC .Removed the old unit and bench tested it and it would hang up,causing the car to stall Thank alot Kev	9
	1996 Chevrolet Corvette 5.7L Cuts out, Misfire VIN: 1G1YY3254T We have not fixed this vehicle. We however changed fuel filter.pulled injectors flow tested and cleaned. cleanned mas air flow. Since the problem only happens above 74 we decided to send out to another shop with a dyno thanks for all the help jerry	6
	1996 Chevrolet Caprice Classic 5.7L heater VIN: P8TR125683 Finally, got this vehicle back to work on it. Thanks to all who replied most said heater core and some said restricted heater hoses. I replaced the heater core with oem part and heater hose assemblies with the flow meter valve. Everything works great no longer...	19
	1999 Chevrolet Blazer 4.3L Flasher Unit VIN: 1GNDT13W9X Thank's to everyone for their help. ` Replaced multi-function switch blazer back on the road. Thanks again to everyone for your quick response.	11
	2000 Chevrolet Silverado 2500 6.0L no go VIN: 1GCGC24U11 problem fixed, special thanks from 'Timothy from Texas' who sent me the manual procedure this is what he wrote i've seen a lot of these, we almost always replaced the ignition lock cylinder (it contains the passlock sensor) and to be on the safe side the i...	6
	2002 Chevrolet Suburban 1500 LS 5.3L front diff fluid I'm not sure what fixed this truck. The front drive shaft(after checking several others) will always turn, but is allowed to slip a little. I dissassmbled, reassembled, and double checked my work and sent the vehicle out. I have not had the vehicle return with...	4
	1998 Oldsmobile Intrigue 3.8L Surge VIN: 1G3WH52K2W I got a lot of replies on this after my update, all seem to be good things to look at. Customer hasn't been heard from or returning my calls to come back in. Recently heard he has been to other places complaining of problems after work has been done. Not sure ...	17
	1995 Pontiac Grand Am SE 2.3L No Start VIN: 1G2NE55D85 You were right on the mark with your advice. I cleaned the fuel rail and screens on the fuel injectors. Also had to replace one injector because the resistance was too high. The car now runs great. Thank you for all of your help. Thanks especially to Fred, Dan...	18
	1997 Pontiac Grand Am SE 2.4L Poor Idle Quality VIN: 1G2NE12T7V Thanks to all who have responded. I found that although there were no resent repairs to the water pump or related areas, a chain guide had broken and the chain jumped one tooth. Replaced all chain componets and we have a good running veh. thanks agin. Mike Trouble codes: P0300.	20
	1997 Pontiac Sunfire GT 2.4L Mechanical VIN: 1G2JD12T0V We determined the noise was a wrist pin knock and informed customer. He declined any further work to be done. Customer was going to call G.M. to see if they could help him out at all.	6

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