GM Automotive Technicians Technical Discussion and Fixes for Mar 28, 2007

Join Now

Prev	Professional Automotive Repair Technical Discussions for March 28, 2007 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
	1996 Buick LeSabre Custom 3.8L Hesitation VIN: 1G4NC64MAT Hopefully someone has ran into this issue before. I've done my share of intake gaskets on the 3.1 liters, but this last one that I did is causing me a problem. This is the first one I did with different length pushrods, but I made sure I put them back in their...	View
	2002 Buick Century Custom 3.1L abs motor VIN: 2G4WS52J12 i just started working on this vehical today.when your driving down the road the abs motor will start to run then shut off,sometimes it does it when you hit the brakes and sometimes you can just be driving down the road without your foot on the brake.it had a ...	View
	1996 Cadillac DeVille 4.6L Oil pump loses prime VIN: 1G6KD52YXT Help, Gurus! This fine ride first arrived three weeks ago from a different garage that did not have the capability for replacement of the oil pan. Other shop had already done subframe but didn't realize what they were in for to gain access to the pan. Anyway.....	View
	2000 Cadillac DeVille 4.6L compressor VIN: 1G6KDS4Y2Y Car came in with a/c not working. It was about a half pound low of 134a. So we top off the system. We could not find any stored codes. A/C still not working. We also noted that air will only blow thru the defrost vents. It will not change regaurdless of mode s...	View
	1993 Chevrolet C3500 Cheyenne 6.5L hard start VIN: 1GTHC33F4P we have a diesel that is hard start.glow plug system is okay and put on a lift pump because it was inop. the bleed valve in the front of the engine when you bleed it and fuel comes out,the truck will start. let it sit awhile and recheck all air and when fuel d...	View
	1993 Chevrolet K3500 Cheyenne 5.7L Front axle VIN: 1GCHK34K9P Thanks in advance for any help you can give, this truck has me pulling my hair out. Customer came in with complaint of the front axle not engaging. Verified complaint but noted an inconsistent clicking noise coming from around the front end. Drained a bit of f...	View
	1995 Chevrolet Astro 4.3L rattle clip This van came in for a routine trans service and now has no third or fourth gear. For training purposes we agreed to attempt a rebuild. All is well except for the rebuild instructions from mitchell. Is there a good source for a overhaul procedure some where, i...	View
	1996 Chevrolet K1500 6.5L No Start VIN: 2GCEK19S3T we have this diesel which came in with a no start on the hook.Client says he was leaving his drive way and noticed after driving faster{approx 30 miles per hr}he had selector in 2nd gear{by accident} and engine was reving.He then proceded to manually put it in...	View
	1998 Chevrolet K1500 Cheyenne 5.7L brakes in general VIN: 2GCEK19R7W Customer brought vehicle in for complaint of loss of power and vibration in front end while at highway speed. Drove vehicle and quickly noticed odor of burning brakes. Found BOTH front wheels locked up. If you bleed front brks condition goes away until vehicle...	View
	1999 Chevrolet Tahoe 5.7L turn signals VIN: 1GNEK3R1XJ i have a tahoe that came in with the turn sihnals going out every time you step on the brakes found the turn signal switch had melted inside, replaced switch and now all the brake lights flash when signals are turned on, thanks for any help	View
	2001 Chevrolet Tahoe 5.3L service 4wd light VIN: 1GNEK13T91 Service 4wd light comes on while driving. Key off, then on light goes out. On the rack the 4WD engages in 2 hi, 4 hi, and 4 lo. All scanner readings agree with what is actually happening. just the occasional llight coming on.	View
	2002 Chevrolet Silverado 1500 4.8L 4wd VIN: 2GCEK19V82 Hi Members: Customer arrived at shop complaining of strange noise when driving in 2 wd. He said he heard a sound like a "bad speedometer cable" and the 4WD light came on. He said the noise was quite loud and he pulled over and looked under vehicle. He did not ...	View
	2002 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEC13Z42 customer came in with a no power concern. found fuel filter plugged. replaced fuel filter, spark plugs and wires. now vehicle will not start. check engine light stays on when cranking.	View
	2002 Chevrolet Malibu 3.1L radio/dash gauges/key fob VIN: 1G1ND52J82 Looking for any ideas, did a search of data base and seem to see alot of bcm issues. Customer driving vehicle had temp and fuel gauge drop out, no key fob operation and radio would not turn off with key off. With key off the radio could be turned off and on at...	View
	2002 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEC13Z42 vehicle came in with low power, found fuel filter clogged. replaced fuel filter, spark plugs and wires for maintenance/mileage. now vehicle will not start. no injector pulse. any help would be appreciated. Trouble codes: P0101 (mass air flow)	View
	2004 Chevrolet Silverado 1500 4.8L cannot fuel vehicle hello, and thanks in advance for any help. this chevy came in because the customer could not fill the gas tank. pump would click off every 50-75 cents. it also had mil on, po446,evap vent control problem. removed evap vent solenoid, found it was stuck shut. re... Trouble codes: P0446	View
	1999 GMC Safari SL 4.3L speedometer/odometer VIN: 1GTDM19W7X Need some help on this 'beast'. At odd times whilst driving, the speedometer and odometer would work in tandem. And sometimes they BOTH won't. Scanned computer and monitored VSS on PCM data. It's fine and so is the shifting of the transmission. So I think the ...	View
	2000 GMC Safari SL 4.3L Hesitation, Misfire VIN: 1GKEL19W7Y the van has had random misfires on all cyclinders under light load. doesn't matter if it is hot or cold. happens while in o/d with light acceleration, or from 10-20mph. if you brake torque it won't miss. if you accelerate hard it won't miss. has had the proble... Trouble codes: P0300	View
	2003 GMC Sierra 1500 SLE 5.3L braking capacity VIN: 1GTEK19T73 This is my own vehicle which I purchased new. Ever since it was new I've complained about the braking . It takes a lot of pedal effort and the pedal seems soft. The dealer has checked it a couple of times under warrantee. The last time, they replaced the maste...	View
	1991 Oldsmobile Cutlass Calais 2.3L Surge VIN: 1G3NL14D0M hello excelent tech's This vehicle has stumped more than one good technician. including me! The car runs great. (no miss, good power, idle is smooth, and customer has no complaints) It will not pass an IM240 E-Test and it has the white ignition module. her...	View
	1994 Oldsmobile Cutlass Supreme 3.4L injectors VIN: 1G3WT35X1R car came in for trany, just swap it out, done. now car has fuel, spark and no negitive pulse to the injectors, has anyone ran into this before? also have a 3.8 bonneville same conditions. and yes we checked the antitheft system.	View
	1993 Pontiac Grand Prix LE 3.1L Hesitation, Cuts out VIN: 1G2WH54T2P stumbles, hesitates, coughs, boggs down on light or heavy acceleration. replaced ecm, prom and cam sensor. didnt help. had multiple codes (13)on arrival. cleared codes. they all came back after short drive. 68,66,22,21,23,25,53,42,35,15,13,17,6,8. replaced ecm...	View
	2001 Pontiac Bonneville SE 3.8L rf wheel VIN: 1G2HX54KX1 C1222 was pulled. replacing the wheel bearing again. I told this vehicle for a test drive again. I have my scanner connected to the vehicle has I am driving I watch the wheel MPH everything is good except when I come to a slow stop. when I do this the right fo...	View
	2002 Pontiac Grand Am SE 2.2L oil life monitor VIN: 1G2NE52F02 Hello everyone,this is my first request and I hope I do it properly.I have a small problem with this vehicle, no matter how many times I try I cannot get the oil life monitor lamp to reset.The vehicle has been here before and have had slight difficulty in rese...	View
	1993 Saturn SW1 1.9L entire vehicle VIN: 1G8ZG8285V hey guys i hope there are still some saturn experts out there,i have one that when you start the vehicle it idles up high but than goes down to normal,but if you apply the brakes both tail lights light up aswell,and if the vehicle stalls,and if turn the head l...	View
	2001 Saturn SL1 1.9L Surge VIN: 1G8ZH52831 This Saturn continues to elude us (get me mad) The Customer CRYING girl School Teacher Drives this car 28 Miles one way per evening to Night School She states the car starts surging (RPMS go up & down) Then the engine races and she has to put her foot on the b... Trouble codes: 172 (Rich)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2003 Cadillac Escalade ESV 6.0L Driver's Seat Heater VIN: 3GYFK66N83 Turned out to be the driver's seat back heater. The updated specs said 2-5.5 ohms. This one tested out at 5.7 ohms(didn't think this would make a difference...wrong!) Removed heater element(pretty easy) and it was burnt around driver's left shoulder area. Repl...	6
	1991 Chevrolet Camaro Z28 5.0L No Start, Poor Idle Quality, Hesitation, Misfire VIN: 1G1FP33F0M I retested the dist. and the pick-up A)C) voltage was low so I replaced the dist with a new one. Same problem. SO I went back to the Inj. Waveform seemed ok, and resistance was within specs according to Mitchell on demand. So I unplugged one at a time during t...	9
	1999 Chevrolet Astro 4.3L No Start VIN: 1GNDM19W9X thank you to all who replied,many good suggestions, but the kicker here was that the upper plenum was full of fuel due to a ruptured pressure regulator. taking off the upper plenum will allow you to see exactly what happens. key crank and fuel pours out of the...	20
	2002 Chevrolet Express 2500 5.7L Hesitation, MIL Lamp on VIN: 1GC6625R82 REPLACED COMPUTER AND ALL IS WELL . THANK YOU FOR ALL THE HELP. MIKE p Trouble codes: P0300 (misfire code), P1381 (misfire code com. error between pcm and ebcm).	6
	2004 Chevrolet Astro 4.3L E85 Fuel usage VIN: 1GNDM19X64 All of the fine techs on here have convinced me to be like Rhett Butler and be Gone With the Wind from this project. Have walked away from it. Thank you all for you great input.	15
	1995 GMC white/volvo 10.6L fan VIN: 4V1WDBDF2S thanks for all of the responses. after running vehicle for several hours was able to determine function of the hi and low cutouts by trial and error but came up empty on a malfunction. replaced compressor under warranty, flushed system and recharged. after s...	4
	2000 Oldsmobile Intrigue GLS 3.5L oil consumption VIN: 1G3WX52H1Y thanks to all that helped. my tech had the car in the other day and replaced the pcv valve with a gm part. since then the car has not used one drop of oil . this one was very different. i cannot believe something so little could be the problem.	12
	1999 Pontiac Grand Prix GTP 3.8L Cooling Systems VIN: 1G2WR5211X I pulled the supercharger off and it had sucked the gasket in and it appeared to be pushing coolant up through a couple lower intake bolts. there was a little coolant under the s/c when i pulled it off,it might have been pulling some of it in from the pool on ...	9
	2001 Pontiac Grand Prix SE 3.8L Hesitation, Surge VIN: 162WP52K81 Thanks everyone for the help. It was the fuel pump. Thank you Craig [...] Help To Find The Mode6 Info.	3
	2003 Saturn L300 3.0L warning lights VIN: 1G8JW54R83 thank you all for the replies. the customer called saturn and their master tech called me back and said that it is the bcm and that when a new one is installed it will need to be flashed by a gm dealer. i did find out that the abs light and the air bag lights ...	3

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