GM Automotive Technicians Technical Discussion and Fixes for Feb 22, 2006 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1992 Buick LeSabre Custom 3.8L Stall VIN: 1G4HP53L2N car came in with a stalling concern. after about a 10 min. test drive car stalled and would not restart. after sitting for about five min. car restarted. after stall rpm read zero while cranking. dtc 17 set current and history. put scope on terminal c on ignit... Trouble codes: 17 (rpm signal shorted)	View
	1999 Buick Park Avenue Ultra 3.8L Surge VIN: 1G4CU5216X hello. i have a 99 3.8 supercharged park ave, it has a surge at light throttle, about 15 to 1800 rpm, and about 50 to 55 mph. has no codes, it doesn,t seem to be miss firing. according to my scanner. 0 on miss fire counters. and the tcc slip rpms never go over...	View
	2003 Buick Rendezvous CX 3.4L Rear Differential VIN: 3G5DB03E73 Greetings GM techs. This Rendezvous came in with a loud howl and vibration in the drivetrain that varied in intensity with speed and load. When running the vehicle on the hoist we narrowed down the noise to the rear differential area. We have removed the rear ...	View
	1993 Cadillac Seville STS 4.6L Cylinder heads VIN: 1G6KY5292P Hi Techs, we have a northstar engine that is pumping coolant and we are removing the heads,this is a first for us. Our book says it is recommended to remove the powertrain then remove the heads. Can this job be done without removing the powertrain? We are more...	View
	1997 Cadillac DeVille 4.6L Cuts out, Stall VIN: 1G6KD52Y1V Ok Good Afternoon I have this Caddy that my customer brought in with the concern that it sometimes stumbles and sometimes dies out.To date it has happened to us once and that was on the way to pick the customer up after driving it for two days.Here is what we ...	View
	2000 Cadillac Catera 3.0L oil/moisture seperator VIN: W06VR54R9Y Vehicle back in the shop with a misfire code. Using smoke machine, vacuum leak was found around PCV runner atop plenum. Upon removal of plastic PCV runner, excessive sludge (milky white) was found running through it and into the throttle body. Rechecked oil fi...	View
	2000 Cadillac Seville SLS 4.6L StabilitySys VIN: 1G6KYS490Y Hello everyone, I have this Seville STS that turns on the "Service Stability System" message in the info center. This happens when driving at highway speeds going straight. It always sets a code C1287 Steering sensor rate malfuntion or steering sensor circuit...	View
	1991 Chevrolet Corvette 5.7L Poor Idle Quality, Misfire VIN: 1G1YY2385M We have this 91 Corvette in the shop driving us crazy. As it warms up it gets a pretty severe misfire at idle. It's not a consistant dead hole, it just seems to intermittantly loose a cylinder. The rpm's will drop almost to the point of stalling, then the idle...	View
	1991 Chevrolet S10 Blazer Tahoe 4.3L Cooling Systems VIN: 1GNDT13Z7M well this one is from our sister shop. a tech replaced the intake gaskets flushed the coolant and replaced the t-stat. now the vehical will idle fine and do in town driving fine but as soon as you go on the highway the vehical overheats almost insantly. when i...	View
	1993 Chevrolet G10 Chevy Van 5.0L Starting VIN: 1GBEG25K3R the problem is not present it kind of fixed itself when i pulled it in the shop.this is a conversion van that when you tuen the key off it doesnt turn off.it keeps running,not dieseling but running normal.has any one seen this before?	View
	1999 Chevrolet Silverado 1500 5.3L abs VIN: 1GCEK19T6X When going around 15 mph or less when you apply the brakes the pedal starts to surge and go down .The rear and both front wheel sensors are always reading 3mph even sitting still but when you start moving they go up to the normal speed .When you drive normal s...	View
	2001 Chevrolet Cavalier 2.2L MIL Lamp on, runs fine VIN: 1G1JC12451 Customer brought in car with check engine light on, car running fine. Retrieved code P0440, emission system fault. Checked out wires by canister back by fuel tank coming out of body ( have seen them corroded there before on cavaliers), found nothing, wires and... Trouble codes: P0440	View
	2000 Geo Metro 1.0L Excessive Emissions, MIL Lamp on VIN: 2C1MR2269Y Hello All, This car came in a No start. It started right up for me but ran rough, Plugs were black and fouled out. Check for codes and it had 134 in a pending code. Checking activity for 02 and found it to be inactive. Replaced the sensor with no change. Check... Trouble codes: 134 (b1 s1 inactive 02)	View
	2002 GMC Savana 3500 5.7L rear wheels VIN: 1GDJG31R42 We have used the Dorman wheel studs here for many years without any problems. Within the last 6-7 months we have had 7 trucks that use the 13" x 3 1/2" rear shoe brake with dual rear wheels shearing all of the studs. Does anyone else have any issues with the h...	View
	1998 Pontiac Sunfire SE 2.2L Radio VIN: 1G2JB5245W Hi all. Sorry but haven't had a lot of time to diagnose this car, so not a lot of info available. I hope someone out there has ran into this. The customer brought this in christmas eve day (2005) with this problem. After having a battery installed at a local t...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1993 Buick Regal Limited 3.8L No Start VIN: 2G4WD54L5P Sure hope no one else gets one of these. As it turns out, the car had overheated and melted several wires in the main harness. After all of the time spent on the vehicle, the customer had no money. Thanks to EVERYONE who responded, your help was critical and g...	23
	1997 Buick Riviera 3.8L Steering VIN: 1G4GD2214T I am going to post this as a fix even though the customer has not decided what to do yet. 7 replies and 6 out of 7 said rack. I guess the Magnasteer system has rack problems according to some the lower bearing in the pinion gear is inferior from day one. Thing...	10
	2000 Buick LeSabre Limited 3.8L suspension VIN: 1G4HR54K5Y Thanks to all who replied. After investigating some of your suggestions we had decided to try the bearing unit on the left side front. Customer did not want to proceed with any other 'fixes' at this time but may want to try the bearing later. They took it on a...	12
	2001 Cadillac DeVille 4.6L head bolt threads VIN: 1G6KD54YX1 This nice Caddy is fixed...I removed the engine from the cradle and placed it on the bench, covered the decks and the front timing area with masking tape to keep out all the aluminum from the drilling & tapping process with the Timesert kit I purchased ( passe...	10
	1995 Chevrolet Blazer 4.3L No Start VIN: 1GNDT13W7S Thank you all that responded. I still havent got this thing to start yet but will post fix when I find irt. Trouble codes: P1351 (ic curcuit voltage high/open).	21
	1995 Chevrolet Tahoe LS 5.7L Mechanical VIN: 1GNEK13K1S well it looks like the cust. Has fallen into the I will replace the truck and not fix. Thanks for all the great replys.And I dont have any information on what fixed the truck, you know the reply from the cust. Thanks for your time, Mark	21
	1998 Chevrolet S10 LS 4.3L transfer case VIN: 1GCCT19W1W Gentlemen This no shift transfer case problem is repaired. I recived 9 responses which covered the four main areas. Electrical ( blown fuses, bad connections or the control switch ). The encoder/motor. The tccm( transfer case control module ). The front shif...	9
	1999 Pontiac Sunfire SE 2.2L starter VIN: 1G2JB1240X First I would like to thank all of the people that took the time to read and respond to my cries for help. The problem was the GM recall. The recall involves instalation of a relay for the starter motor. On the control side the purple wire that usually goes to...	8
	2000 Pontiac Montana 3.4L traction control VIN: 1GMDX13E5Y this problem has gone away with the cold weather. all 6 responses indicate a wiring issue to the wheel speed sensor and although i could not prove it, i believe this to be the fix. i have ordered new harnesses and have them ready to go when the problem returns...	7
	2001 Pontiac Sunfire SE 2.2L Lighting VIN: 3G2JB52431 thanks for all the help. this car has not returned for repair yet so it has not been fixed. all responses have led me to believe that the problem is in the wiring under the headlights and battery tray. i have since fixed 2 other cavaliers with similar head lig...	11
	2002 Pontiac Grand Prix SE 3.8L Door locks VIN: 1GWP52K32F The customer decided not to repair the car, Before the car left I checked BCM connections and grounds, And all other grounds. I did not find any thing wrong. There were some that suggested the BCM was intermitantly causing the problem, Another suggested the ig...	5
	2000 Saturn LS2 3.0L Misfire, MIL Lamp on VIN: 1G8JW52R7Y I called the customer yesterday and asked how the car has been running since Iput the spark plugs in it and he said it has been fine with no check engine light. So I would say that the plugs fixed the problem. Trouble codes: P0300 (Random Cylinder Missfire), P0304 (Missfire Cylinder 4).	4
	2002 Saturn L200 2.2L Misfire VIN: 1G8JU54F82 Thanks to everyone that took the time to respond to my help request. Several people said to check for high resistance in the plug wires. This vehicle only had a short 'boot' with a coil of wire in it that connected between the coils and the plugs. My fried c... Trouble codes: P00, 300 (Random Missfire).	21

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