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

×

Join Now

Prev	Professional Automotive Repair Technical Discussions for April 1, 2004 International Automotive Technicians' Network (iATN) - Members Only	Next
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM

	Help Request	Answers
	1998 Buick Regal 25th Anniversary Edition 3.8L Hesitation VIN: 2G4WF5211W Car stumbles/hesitates upon moderate/heavy acceleration.If you keep the boost out of it,car runs fine.As soon as the Blower kicks in,the car falls flat on it's face.Exhaust seems to be open,no restrictions.Compression good.Car starts fine.No codes are stored,a...	View
	1977 Cadillac DeVille 7.0L power antenna VIN: 6D69S7E663 I am trying to get the location for the power antenna relay on this vehicle.I no longer have access to alldata or mitchell.If anyone can help me by giving me the location...it would very much be appreciated.Thanks in advance. my e-mail is rwaycaster@charter.n...	View
	1990 Cadillac DeVille 4.5L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1G6CD5331L vehicle was tow it din't start. we check spark, fuel and notice fuel pump was not working told the customer. when we disconected the filler hose to drop tank down. the filler hose was full of sugar. so we replace the fuel tank ,fuel pump, fuel filter, replace ...	View
	1993 Chevrolet C1500 Suburban 5.7L pulling right VIN: 1GNEC16K4P Hello again: we have a fun one hear. this suburban has a nasty pull to the right. the brake pads, rotors, front hose, abs hyd.module & calipers have been all replaced. the module was the customers idea! on a cold test drive all is working just fine but after t...	View
	1995 Chevrolet C3500 6.5L bucks VIN: 1GBKC34FOS need some help with this deisel. mitchel says to set codes 35 or 36 pulse width is more than 2.5ms or less than 1.2ms, it sets 35 at idle, pulse width on snapon is 1.95ms , bucks on the hiway, except on deceleration. Trouble codes: 35 (inj. pulse width error short responce), 36 (inj. pulse width error long responce)	View
	1996 Chevrolet S10 2.2L drive shaft VIN: 1GCCS144XT Hi All. Vehicle Came in with check brakes problem. Front brakes were almost into the rivets so we addressed that issue. Road tested & Found A Chirping Squeek noise That is Rotation Speed affected at low speeds . Coming to a stop or on acceleration. Thought was...	View
	1999 Chevrolet C1500 LS 5.7L Surge, MIL Lamp on VIN: 1GECEC19RX Truck surges under acceleration. Found following codes stored PO171, PO174, PO300. Verified symptoms. Does surge and has loss of power under acceleration. Monitored left and right oxygen sensors - system does go lean and short term fuel trim will rise to +40% ... Trouble codes: P0171, P0174, P0300	View
	2000 Chevrolet Astro 4.3L service all wheel drive VIN: 1GNEL19WAY trans works ok but can not get lite to go off no trouble codes acording to my snappy scanner thanks for your help	View
	2004 Chevrolet Silv 25004wd 6.0L Poor Fuel Economy VIN: 1GTHK24V12 Sorry about the wrong VIN, but looking for ideas more than a fix. My customer has this 04 Chevy 2500HD 4wd with the 6.0 engine, 373 gears, pulling a camper and sucking the gas. It has a 26 gal tank, and he was wondering if they made a larger tank for it, or ma...	View
	1991 GMC Sonoma SLE 2.5L Excessive Emissions, Poor Idle Quality, Cuts out, Misfire VIN: 1GTCS14A5M Thanks to all in advance. Trtuck came in to shop on tow truck a couple of days after replacing the exhaust from the CAT back.Truck started buck wouldn't rev at all. Checked all the basics, codes, resticted cat, fuel pressure, timing. Found timing was found to ...	View
	1996 GMC Sonoma SL 4.3L abs lamp on VIN: 1GTDT14W1T Hello every one, my coworker has a 96 GMC sonoma 4x4 w/ 4wheel abs. the problem is the abs lamp is on and the system is inop. with my monitor 4000 enhanced I am getting codes c1265 & c1268 the only way the codes make sense is if you look up the last 2 digits o...	View
	1999 GMC K1500 Suburban SLE 5.7L light on VIN: 1GKFK16R6X ing switch and lock system changed security light stays on will not go in self dienostic starts and runs ok all fuses ok allwirers and conecters ok	View
	1999 GMC K3500 Sierra SL 7.4L abs VIN: 1GDJK34J7X Hi there guys, I have an ABS system that wants to come on when slowing down below 10 MPH! The truck came in loaded with codes pulled with a Tech 2 as follows. CO281 stop light swich, CO226 LF sens missing,CO221 RF sens open, CO223 RF sensor erratic, CO222 RFs...	View
	2003 GMC Sierra 2500 HD SLE 6.6L MIL Lamp on VIN: 1GTHK23153 This truck has a code P0404 code and I need a lttle help troubleshooting. It has low vacuum on the egr vacuum line until I block off the egr valve. As far as I can tell the egr should hold vacuum. If so, then that is my problem. If not, then I could use some h... Trouble codes: P0404 (EGR open position performance)	View
	1991 Pontiac Grand Prix SE 3.1L No Start VIN: 1G2WJ14T2M Hey Guys this one is a problem I probably should not have gotten into, Anyway the customer has replaced a ton of stuff as you can see, after throwing all these parts at it he decided to bring it in. I hooked up my scan tool and right off the bat it is reading ...	View
	1992 Pontiac Grand Am SE 3.3L Poor Idle Quality, Stall VIN: 1G2NE54NXN Intermittent dies after 35 minutes of driving. Normally restarts with foot on pedal to keep it running. Dies coming to a stop. Engine vibrates intermittently. Mostly after engine gets hot. Goes away around 1600 rpms. Cylinder balance test fine. Lab scoped cran... Trouble codes: 27 (2nd gear intermittent code.), 28 (3rd gear intermittent code.)	View
	1996 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 3G2JB5247T The Customer Complain : Cooling Fan staying on and the MIL lamp is on as well. I did a scan test with the Mastertech. I got system code P0342 (Camshaft Position Sensor). Then did the Test and Inspection Procedures according to Alldata. (It is normal to have th... Trouble codes: P0342 (cam shaft position sensor)	View
	1997 Pontiac Trans Sport 3.4L Power Sliding Door VIN: 1GMDX06E3V Hello Group, This vehicle has a problem with opening the PSD. When activated by any of the three switches (RKE, overhead console, B pillar switch) door will unlatch but motor will not run. As far as I can tell the module is not commanding the motor to run. Cab...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Buick Park Avenue 3.8L engine VIN: 1G4CW52K7T Thanks folks, most the replies I had said to check the pcv valve and that the noise I was hearing was air being sucked through the crank seals. You were right, the customer had another shop change the intake manifold because it was leaking and the guy who did ...	12
	2000 Buick Regal LS 3.8L No Start, Hesitation, Cuts out, Stall, Misfire VIN: 2G4WB55K8Y Thanks to the seven of you for your alter egos and input. They did not hit the head of the nail, but nonetheless helpful in keeping my head in the game, and kept me thinking. I had check all of what you had said mostly about the regulator before I posted, but ...	7
	1989 Cadillac Fleetwood 4.5L crankshaft VIN: 1G6CB515XK Thanks guys. 2 out of 6 hit it right. Aftermarket water pump was defective. replaced it with new, not rebuilt, and now the noise is gone. Thanks daniel and victor. P.S. found out has had three aftermarket pumps in the last 4 years,	7
	1996 Cadillac Seville SLS 4.6L Misfire VIN: 1G6KS52Y3T There were a number of ideas with this problem. Ranging from carbon tracking which we were seeing to the blower motor interferring with the signal to the plug. We install a updated blower motor with shield and we have not seen back. We also replaced the wire a... Trouble codes: P0305.	14
	1998 Cadillac DeVille 4.6L Stall VIN: 1G6KD54Y7W Hey guys this car is finally fixed. I put in both crankshaft position sensors and that has cured the problem. What I dont understand is why, if the computer uses them redundantly, and has to switch over to the other one if one fails, then why does it not s...	5
	1989 Chevrolet R2500 Suburban Scottsdale 7.4L high idle VIN: 1GNGR26N0K All replies recieved refered to throttle body base gasket leaks or bad computer both of which were replaced (the computer was replaced 3 times, all from different suppliers)I tried all Tech help lines we have axcess to and no one had any answers to this proble...	22
	1995 Chevrolet Corvette 5.7L Unknown VIN: 1GYY22P8S5 steve from florida hit the ltpws on the nose. we tested the system by , what else ?? , making the system work. we lowered the air pressures in the tires one tire at a time and test drove the vehicles. the tires that the sensors where operating in the low / fla...	5
	1995 Chevrolet Blazer 4.3L Hesitation, Surge, Cuts out VIN: 1GNDT13W3S We can call this one fixed. Thanks to all the great replies. Michael [...] hit it right on.We pulled the Upper Manifold off and found that one side was clean from fuel the other side nasty looking.We pressured the system and found no leaks but by...	13
	1996 Chevrolet Lumina 3.1L Poor Idle Quality, HIGH IDLE Gentalman it has been awhile since this was posted, however the customer had to wait until funds inproved. Well we got a new computer and installed it, as most of your replies suggested after checking my grounds. Well the car has been repoted running great now...	9
	1997 Chevrolet Blazer 4.3L Noise when accelerating VIN: 1GNDT13W4V Well thanks guys I will have to write this one down as a wild goose chase. After going through this with a fine tooth comb we found nothing that is wrong or could be wrong. The techs that did reply gave great ideas in regards to the backpressure, intake leaks,...	6
	1997 Chevrolet Camaro Z28 5.7L will not move sometimes? VIN: 2GIFP22P3V thanks to all who replied - this car will be coming in as soon as weather warms up - I'll update post more then	8
	2002 Chevrolet Suburban 1500 LT 5.3L Dash fire VIN: 1GNFK16Z12 This one is taking a long time to fix. The lastest is that my boss wants to call in an expert, probley from GM I understand they have someone from the factory that flys out and investigates fires, I WILL POST WHAT EVER I FIND OUT. But right now things are move...	10
	1996 Geo Metro LSi 1.3L No Start VIN: 2C1MR229XT Tried another cap and rotor no luck. My parts guy I have dealt with for years says he sells a good many of these distributers. He sent me one and said he had a good feeling since he sold a lot. He even told me if he was wrong he would take it back. After it wa...	20
	1996 GMC K3500 Sierra SL 6.5L engine VIN: 1GTHK33F2T We received 6 replies all with good suggestions going by the recomendations we ran a compression test and a leak down test this verified we had an internal engine issue we gave our findings to the owner of the truck but he decided to sell the truck rather than...	6
	1999 GMC K1500 Suburban SLE 5.7L light on VIN: 1GKFK16R6X reset with tech 2 gm scan tool snap on has no body control	3
	2000 GMC Jimmy SLE 4.3L Misfire, MIL Lamp on VIN: 1GKCS13WOY well i learned something from this always check it for yourself i listened to my boss about the fuel pressure being within specs after i read wheat you guys said i went in the next morning and put the fuel gauge on and yes it was acting up and yes it was like ... Trouble codes: 171 (air flow meter), 174 (air flow meter).	13
	1995 Pontiac Grand Am SE 3.1L 3.1 Engine replacement VIN: 1G2NE55M2S WOW Guys -- Thanks for the great responses -- & quick too. The general consensus is (by about 2 to 1) that the engine will come out the topside, but it is pretty tight. You guys that are dropping the complete driveline & cradle out the bottom must have lots ...	20
	1997 Saturn SL1 1.9L vent temp I received a number of helpful replies on a strange problem but Paul, you hit it right on the head, it was the oil. I flushed the whole system and added oil from Saturn and Bingo! I had a vent of 36 degrees. My pressures still were off but 4 season told me the...	10

(Also Available: All, Asian, Chrysler, European, Ford, GM.)