GM Automotive Technicians Technical Discussion and Fixes for Nov 1, 2004 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1988 Buick Electra Limited 3.8L Broken Hood release cable VIN: 1G4CX69B9G I can not unbolt from behind grill Hood latch bolted from inside. Hood opens forward once released There has to be a way anybody please help	View
	1995 Buick Riviera 3.8L No Start VIN: 1G4GD2213S Vehicle came into the shop from two other shops. I could not get it started and neither could they. We get one spark out of the coil when we began cranking. We lose spark right thereafter. It will not fire again until we turn the key off and crank again. It wi...	View
	2000 Buick Regal LS 3.8L passlock VIN: 2G4WB55KXY Vehicle came to shop with no start condition.Vehicle would not crank.Tested starter, found no power to s terminal. checked pcm for codes , found code present for passlock security problem, dealer stated key and tumbler had to be changed.did as sujested still h...	View
	1989 Chevrolet S10 Blazer Sport 4.3L No Start VIN: 1GNCS18ZXK Hello Fellow Techs, I have one that's really puzzling me and wanted to see if anyone has come across this. The customer stated that he was going down the road and the vehicle stalled on him and wouldn't restart. When I got it in would crank, have fuel and inj...	View
	1995 Chevrolet Tiltmaster 5.7L Stall, MIL Lamp on VIN: 4KBB4B1A4S This vehicle came in with all the related repairs already done to it. I am fixing it for another garage. The vehicle starts up and runs great all day long. As soon as you put it in gear after it is hot it stalls. I can drive the vehicle all day long as long as...	View
	1995 Chevrolet Lumina APV 3.8L Cuts out, Misfire VIN: 1GNDU06L5S Vehicle is a recent addition to a car lot. Van will cut out whenever it wants, no pattern, and will restart with no problem. Apparently the previous owner had problems because it already had new crank and cam sensors. Tried a crank sensor because I had a 3.8 w...	View
	1995 Chevrolet Lumina APV 3.8L Poor Idle Quality, Hesitation, Stall VIN: 1GNDUO6L7S Thanks for reading and hopefully responding to my post. When cold this van starts and runs great for thirty seconds. The first event noticed is the O2 drops from .800 to .040. The IAC opens, fuel pressure responds, grams per second increase and the unit dies u... Trouble codes: P0300 (random misfire)	View
	2000 Chevrolet Impala LS 3.8L lr wheel speed sensor VIN: 2G1WH55K2Y vehicle came in with abs light on and trac control light on checked for codes found code c1234 left rear wheel speed sensor open or short to ground tested system and wiring tested good, replaced ebcm same problem replace sensor twice. what am i overlooking. th...	View
	2002 Chevrolet Corvette Z06 5.7L Pedal height VIN: 1G1YY12S92 This Vette suffers from a decreasing height of brake pedal over approximately a 2 week period. Dealer has attempted repair, but had less success and made less headway than we have made. We have verified lower pedal height and slightly spongy pedal and replaced...	View
	1992 GMC Jimmy SLE 4.3L pedal creeeps to floor VIN: 1GKCS13W3N After doing all of the above, the pedal was better and seemed to work. ON the test drive I hit the brakes hard at a high rate of speed, but not enough to engage the ABS. 5o yards later the pedal hit the floor and the abs and brake lights came on. I had no brak...	View
	1997 Pontiac Grand Prix GT 3.8L valvetrain ? VIN: 1G2WP12K7V Hello, This car has what sounds like a lifter noise, kind of tick squeak noise, worse when hot. Rockers stay tight,lifters do not bleed down. The noise seems loudest on the rocker bolt on cylinders # 3,5,6 or could it transfer up from the balance or cam shaft....	View
	1999 Pontiac Grand Am GT 3.4L Hesitation, Surge, MIL Lamp on VIN: 1G2NW52E9X Hi This is my first posting. This vehicle has P0327 code. Knock sensor and wiring test good. Alldata and Mitchell say if P0327 code is present with no 24X signal and no cam signal to use p0336 power and ground diagnosis. Found no power at Red/White wires (powe... Trouble codes: P0327	View
	2004 Pontiac montana 3.4L wind noise Hi everyone hope holloween went well, My wifes Montana has a howling/whistling noise from the left front dash area at higher speeds or when there is outside wind. I thought I fixed it by removing the top cargo bars but this weekend we drove it and I heard it f...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Cadillac Catera 3.0L MIL Lamp on VIN: W06VR54R0X Replaced Mass Air Flow Sensor last week and customer has not been back. Almost everyone recommended replacing the MAF and many said that they do several every week. I guess Cadillac/Saturn/Saab/Opel had a problem with these systems. By the way I called Snap On... Trouble codes: 171 (System too lean bank 1), 174 (system too lean bank 2).	14
	1965 Chevrolet corvette 350CID radio VIN: 194375S120 The radio and dash speaker came out just as descibed in the detailed instructions. It was a great help on such an old vehicle to not have to remove any more than necessary as to avoid damaging any trim pieces or dash components. Special thanks to Brent in Utah...	2
	1999 Chevrolet Tahoe 5.7L Cuts out, Stall Replaced distributor cap with new one. there was a tremendous amount of corrosion around the center post of the distributor cap. The engine has been running for over four hours without stalling.	16
	1999 Chevrolet K1500 Suburban 5.7L Hesitation, Misfire, MIL Lamp on VIN: 1GNFK16R0X The fix for this vehicle turned out to be the dist. cap and rotor. Customer told us the car had been tuned, and we did see new wires and plugs. He said cap and rotor were changed also, so we did not look. Big mistake. Because one of the replies said use deco c... Trouble codes: 300 (cylinder 4 shows misfires).	11
	2000 Chevrolet Suburban 1500 LT 5.3L abs VIN: 3GNFK16T7Y thank you to all the replies i received, like many of you had said, the vehicle speed from the front wheel sensors were different, scope tested and found a glitch with the driver's side front sensor, owner had requested that both be replaced, we did and he dro...	10
	2000 Chevrolet Silverado 1500 4.8L Poor Fuel Economy VIN: 2GCEC19V3Y Thanks for the replies, Got some interesting info. I questioned the customer till he got mad and found out he thinks his truck has a 30 gallon tank. He got really mad when he was told he has a 34 gallon. I think it is better to get a customer mad than waste my...	5
	2000 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNCT18W9Y first off, thanx for the help.found secondary air pump locked up. also blown fuse next to battery. nice location... thans to all again Trouble codes: P0410 (secondary air injection problem).	8
	2001 Chevrolet Tahoe 5.3L transfer case VIN: 1GNEK13T71 Gentleman, First of all thanks for the good input, actual cause however turned out to be electrical connector for motor control 'a' circuit in a 4-pin connector at the transfer case shift control module. The connector pin was damaged and would only make part...	5
	2003 GMC Yukon SLT 325CID Rotors VIN: 1GKEK13222 The customer has taken the vehicle back to the dealer and they are going to warranty the brakes for them as customer satisfaction. From the replies I have gotten the excessive wear is cause by road muck getting on the passenger side of the rear brakes and GM h...	5
	1989 Pontiac 6000 LE 2.5L Surge, Cuts out, Stall VIN: 1G2AF51R7K first of all thanks for all the great help! after checking all my previous steps over again i decided to try a delco module as some one suggested. it fixed the problem! after two after-market modules the gm one fixed it. im sorry i dont have more time to spend... Trouble codes: 42 (est problem).	15
	1997 Pontiac Sunfire SE 2.2L Excessive Emissions, MIL Lamp on, GAS SMELL VIN: 1G2JB5240V sorry for the delay for my post i just wanted to make sure it was fixed. it turned out to be the purge solinoid under the intake was not working and allowing the comp to purge gas fumes. i replace the purg valve and canister and all is well. thanks again joh... Trouble codes: P0440 (evap system leak).	2
	2001 Pontiac Aztek 3.4L Fuel Gauge VIN: 3G7DA03E41 Good Morning, I got alot of hits on this subject..Thanks to all who responded.It seems this will be a common problem with GM senders.Kennith and Andrew mentioned a poor surface connection and poor tension on sweep arm ( Seems like it may be worth the gamble to...	8

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