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

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Open Help Requests for GM

	Help Request	Answers
	1994 Buick LeSabre Custom 3.8L no start VIN: 1G4HP52LOR This vehicle came in for a no start. Starts and runs perfect sometimes and other times starts and runs about one second and then dies. When it dies it looses injector fire. Hooked up otc 4000E scanner, it has code #s 1626 Pass key failure and 1629 Pass key 11 ...	View
	1997 Cadillac Seville STS 4.6L abs VIN: 1G6KY529XV Net Techs, This Cadillac has a traction control problem. Intermittantly, when takeing off from a stop, you can hear the traction control system apply and the drivers information center reads traction control enabled. There areno codes stored for ABS or any ot...	View
	1989 Chevrolet C1500 Cheyenne 5.0L Hesitation, Cuts out, Stall, Misfire VIN: 1GCDC14H4K This truck is nutting my drives. I mean driving me nuts. This truck will hesitate severly will start pinging, detonating and occasional back fire thru throttle body if you try to push it. If you disconnect the timing connector(black/tan) it runs like thier is ...	View
	1991 Chevrolet Lumina Z34 3.4L engine VIN: 2G1WT14X7M This car stalls when the ac. is turned on and it is completely warmed up. At 230 degrees the fan motor comes on and if it is at idle it stalls. Put a new battery in it thinking more amps to cover the load and still stalls. Only one time I tested the battery an...	View
	1991 Chevrolet Corsica LT 3.1L Inner RH CV Joint VIN: 1G1LT53T3M This car came in a few days ago with a pulled out axle, the RH inner CV joint pulled apart going down the road. They just had it replaced before it went out. So we just figured they had installed the wrong one, so we checked into it and yes there were 2-shafts...	View
	1993 Chevrolet Astro CL 4.3L No Start, Cuts out VIN: 1GNEL19W0P This is for my landlord that has a shop in the same building. they replaced the spider assemble 3 times. it will have spark, fuel pressure good 65, actually pegs his gauge when it won't start, but no injector fire. Don't know much about these, there is a 2 pro...	View
	1994 Chevrolet P30 Motorhom 454CID Hydroboost/ P/S VIN: 1GBKP37NXP This vehicle has a bad problem with the brakes. Has power steering assist when at idle in park and a whine in p/s pump. When I put vehicle in gear the whine goes away along with the p/s assist and the hydroboost assist. When there is no assist, the brake pedal...	View
	1995 Chevrolet Monte Carlo Z34 3.4L booster master cyl, unknown VIN: 2G1WX12X65 the owner of this vehicle says the brakes seem to take excessive pressure on the brake pedal to stop. after taking the car for a test drive everything seems normal except when coming to a quick stop you do seem to have to push hard.there are no abs codes and a...	View
	1996 Chevrolet Caprice Classic 5.7L hard start VIN: 1G1BL52P3T The vehicle is in our county fleet...it acts like the old fuel pump relay failure...cranks a long time and then eventually starts and runs okay...BUT...it has fuel pressure right away...just no spark until you crank it about 15 seconds...then consistently it g...	View
	1996 Chevrolet S10 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Stall, Misfire, Poor Fuel Economy VIN: 1GCCS1446T truck is fixed, read this but don't reply unless you want. Technician changed head gasket that was leaking down the side of the block. ran fine when it came in. after it was back together, it had a rough idle, no vacuum at idle. thought it was map sensor, trie...	View
	1997 Chevrolet C2500 Suburban 7.4L interior lighting VIN: 1GKGK26J6V dome lights come on while trk is moving. Have replaced both door jamb switches. can duplicate problem while in the shop by pulling hard on the steering wheel. Have taken down the panel under the steering wheel checking for bare wires, none found. I have also t...	View
	1998 Chevrolet Monte Carlo LS 3.1L radiator VIN: 2G1WW12M1T Is there a known porosity with this family of GM 3.1 liter engines where oil is leaching into the coolant system from the block? Note there is no trace of coolant in the oil.	View
	2000 Chevrolet Express 3500 5.7L MIL Lamp on VIN: 1GCHG35R1Y This thing is kicking my @$$. It came in with a P0140 HO2S B1S2 insufficient activity. I scanned data and found that the sensor was reading 450 mV at all times. I ended up replacing the sensor. Code reset after a few road tests. So I hooked it up to the scope ... Trouble codes: P0140 (HO2S B1S2 Insufficient activity)	View
	2002 Chevrolet Trailblazer LS 4.2L Front end VIN: 1GNDT13S02 This truck makes a loud noise when the front end dips. Stabbing the break results in a loud creak noise from what appears to be the left front. Bouncing on the front end seems to duplicate the noise but it does it much more when the truck is in gear and the br...	View
	1997 GMC Jimmy SL 4.3L serpentine belt VIN: 1GKDT13W5V Hi everyone. We have a very stubborn GMC Jimmy 4x4 that has had the serpentine belt replaced 3 times. Every time after about a week, the belt gets very noisy and squeaks mostly when the a/c is turned on. All accessory bearings are good, no play, and we were wo...	View
	1998 Pontiac Grand Prix SE 3.8L Air Bag Code VIN: 1GWJ52K1WF This vehicle came in with a code 1025 "Driver Deplowment Loop Short to Voltage". The light flashes 7 times and stays on steady. When the code is cleared it always comes back instantly. The Driver & Passenger Sensor Low reading is 4.1 volts. Driver Resistance =...	View
	1998 Pontiac Trans Sport Montana 3.4L Misfire VIN: 1GMDX06E7W Hi. this 1998 transport has high cylinder#2 misfire counts. When brought off idle(2ooorpm) it cleans out. Tried plugs and wires, swapped ignition wires at coil pack,misfire remains on #2.posible module? Trouble codes: P0300	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Cadillac Seville SLS 4.6L loss of coolant VIN: 1G6KS52Y0V Thanks to all who have hepled. What had me confused was the 185-200 psi compression. WHAT A BLOWN HEADGASKET) WAY DUDE) when i did cylinder leakage test, coolant was forced back out of the surge (overflow ) jug. I sent it on to engine shop. I dont even want to...	10
	1984 Chevrolet P30 Step-Van 5.7L Unknown VIN: 1GBGP32M4E Thank you! Thank you! Thank you! Everyone was right about it being the STEERING SHAFT U-JOINTS STUCK. I took the shaft out and shot some grease into the zerks and worked the joint back and forth till they were free. I took the hydroboost off in anticipation of...	11
	1990 Chevrolet Lumina 3.1L Poor Idle Quality, Cuts out VIN: 2G1WN54TL1 Thanks for all the great resonses -13in all. Bruce [...] hit it right on the head with a blown fuse for the front 3 injectors. the fuse also powered the egr valve. what confused us was that the injectors had power and a ground while the car was running, and ...	14
	1994 Chevrolet K1500 Cheyenne 5.7L Hesitation, Surge, Stall, Misfire, Backfire VIN: 1GCEK19K5R The majority of replies received indicated the distributor pick-up rotor (magnetic) that has a history of cracking, others said to check timing, coil, fuel sys (filter, pump, press), scope sec. ignition system. If I had a scope I would probably have found it s...	14
	1996 Chevrolet C3500 7.4L fuel gauge VIN: 1GCHC33JOT Hello everyone, I would like to thank everyone who responded to my nightmare. This truck has a single fuel tank on the side so there is no anti-slosh module, check all the grounds=good and tight, look at wiring diagrams followed the loom all the way to the fir...	9
	2001 Chevrolet Prizm 1.8L cruise control VIN: 1Y1SK54881 Thanks for the replies, tried to clear the cruise control unit by jumping tc to e1, KOEO, pull the switch to cancel, push main switch on 5 times in 3 seconds. Did not work. Tried using a scan tool, this did not work. We ended up replacing the control unit ...	2
	2000 Pontiac Montana 3.4L instrument panel VIN: 1GMDX03E6Y Most people suggested the ignition switch or dash module. I knew it wasn't the ignition switch by the codes and weird way it was acting. So we ordered a reman dash from the dealer and installed it. It worked for 3 days then acted up again. I had already lost m...	10
	2001 Pontiac Grand Am GT 3.4L injector pulse VIN: 1G2NW52E91 Rec'd a few replies. Thank you ! The first from [...] was short and to the point; unplug the MAP sensor. Bingo ! Unplugged cam and 24x crank sensors to see if it would start, to satisfy my curiosity, vehicle will start. MAP sensor had serious short, causing...	5

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