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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 23, 2009
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
1988 Cadillac Seville 4.5L Master Cyl VIN: 1G6KS5156J
I have this Caddy just kicking my butt. It is a NON ABS car. I replaced the master cylinder. During the bench bleeding process, I was getting no fluid out of the front ports that go to the RR & LF. After messing around pulling a vacuum on a port and plugging t...
2005 Cadillac CTS 3.6L MIL Lamp on VIN: 1G6DP56715
ok cadi guys help me out!! this car is a friend of a friend, ok it comes to me with a check eng lamp on. code p0101 maf performance code, also has bank one rich and bank 2 rich codes(forgot #'s didn't wright them down)but the maf code always comes back, 2-3 mi... Trouble codes: P0101
1991 Chevrolet LLV 2.5L Excessive Emissions, Poor Idle Quality, Hesitation, Stall VIN: 1GBCS10E1M
Vehicle came in with black smoke out the tailpipe and low power. Removed spark plugs - fuel fouled (rear two worse - engine slants rearward with throttle body injection). Checked compression 140 +/- 10 across the board. Install new spark plugs - vehicle has be...
1994 Chevrolet S10 LS 4.3L Poor Idle Quality, Surge, Misfire, MIL Lamp on VIN: 1GCDT19W38
Customer brought this truck into our shop about a month and a half ago- see related repair history for work performed then. vehicle left shop in good running condition. NOW vehicle is back and when i drove it it seemed fine until i got it back into the shop pa... Trouble codes: 44 (lean exhaust)
1997 Chevrolet K1500 Silverado 5.7L low eng temp VIN: 1GCEK14R6V
I'M AN ASE TECH 15+ YRS EXPERIENCE. NOT SURE WHERE TO TURN. ANY AND ALL HELP APPREITIATED. Truck consistantly runs about 170degs. I have replace thermostat multiple times. flushed coolant system.Radiator.water pump.thermostat, have all been replaced with new ...
1998 Chevrolet Malibu 2.4L antitheft VIN: 1G1ND52T7W
Hello I have this 98 Malibu with a 2.4l that came in with an intermittent no-start. I checked codes and it had a P1630, 1631 and 1632 antitheft codes. I could not get into the BCM on this model with my modis for some reason, which is strange it did not show B...
1998 Chevrolet Astro 4.3L Starting VIN: 1GCDM19W6W
hi we have a 1998 chevy astro van with intermittent no start.we check for codes found dtc p1631 we test for that code and are unable to find the cause of the intermittent starting problem.it happen most of the time in the morring we try it 5 times and just cra...
1999 Chevrolet K1500 Suburban 5.7L Misfire VIN: 3GNFK16R6X
Hello fellow techs This vehicle has been a thorn in my side. The customer overheated enging enough to blow a head gaskets. We replaced both head gaskets and had the valves inspected. One valve was replaced. New spark plugs, plug wires, dist. cap. Now the vehic...
2000 Chevrolet Blazer LS 4.3L Reverse Gear VIN: 1GNDT13WT2
I opened up my free trial 24 hour pit pass to search here on iATN from the knowledge base and there was only one transmission related issue from 1998 to 2004 and had nothing to do with my issue. The Blazer when placed into (1), (2), (3), OR (D) does not make a...
2001 Chevrolet Express 3500 5.7L abs VIN: 1GCHG35R01
I've been working on this one on and off for about 3 weeks now and I just can't take it anymore. I get a ton of codes from Tech 2 but none show up on GM's website. I've replace EBCM and BPMV thinking it's a GM it probably fried the EBCM. No change and all the ...
2002 Chevrolet Tracker 2.0L cooling system VIN: 2CNBJ18C42
I hope someone can shed some light on the problem. Vehicle has been towed in twice now for over-heating engine. I have driven the vehicle on and off for a total of about 60 miles and can not get the engine to over-heat. I've done a cooling system flush and rep...
2002 Chevrolet Suburban 2500 LT 6.0L Stall VIN: 3GNGK26U62
Verified customers concern for vehicle just dies/stalls when driving in town. I've duplicated problem and most times vehicle will just die out. When it dies no lights on dash come on(usually if you were to cycle the key off to on your brake, air bag, ect.)Othe...
2002 Chevrolet Astro 4.3L No Start VIN: 1GNDM19X72
Towed in, no-start. Dead battery. Unable to determine if battery was drained due to cranking or leaving flashers on, etc. Charged battery, crank over but no start. Checked fuel pressure, spark, compression, etc. All appear normal. Crankshaft and camsahft senso...
2003 Chevrolet Cavalier 2.2L MIL Lamp on VIN: 1G1JC52F73
This vehicle came in a week ago, for the MIL on. We scanned the vehicle and got a P0440. I smoke/flow tested the evap system, and found nothing wrong except occasionally, the vent valve would leak a small amount of smoke and hang just above the .02 mark. I tes...
2004 Chevrolet SSR 5.3L MIL Lamp on VIN: 1GC3S14P94
Hello group this SSR has a p0315 code that wont clear or learn the crank variation. We have a Tech 2 and have relearned these systems before. The fun starts when the cust stated that it used to have a blower on it, and that 2 years ago it was reprogramed at a ... Trouble codes: P0315
2005 Chevrolet Silverado 2500 HD 6.6L charging system
This is a question about putting dual alternators on a truck that came factory with only one alternator. I have found the brackets and thinkgs put I was told by GM that I needed to buy a $900.00 wiring harness. I was wondering if anyone has converted a single ...
2006 Chevrolet Silverado 2500 HD LS 6.6L Brake Pedal VIN: 1GCHK29D46
This customer had dropped this 06 chevy 2500 hd off for brakes.well their is nothing wrong in the pads,rotors,and brake calipars .no air when bleeding and no codes, but this pedal is way low!!! This system does use a hydro boost that runs off the power steerin...
1998 GMC K1500 Sierra SL 5.7L No Start VIN: 1GTEK19R9W
After this truck sits for a couple of days it won't start right away. After cranking a few times you can hear a pop in gas tank and it starts. When started it runs good until it sits for two days. Any help would be apprieciated. Mike
1999 GMC K2500 Sierra SL 5.7L prindle switch VIN: 1GTGK24R6X
vehicle was picked up on a friday shited and drove geat for 4 days and all of a sudden out of the blue it decide not to have any gears at all towed in to us and went out to the truck and it had all forward gears and lunged in park at idle like it was stuck in ...
2001 GMC Sonoma SLS 4.3L Misfire, MIL Lamp on VIN: 1GTCS14W01
This GMC shows that there is a misfire on cylinder 4 as soon as the truck is raised off idle. The misfire counter counts rapidly on cylinder 4 above about 1400 rpm, when the engine speed is held steady. It does not count when idling or when revving quickly and... Trouble codes: P0304 (Cylinder 4 misfire)
2002 Pontiac Grand Am GT 3.4L No Start VIN: 1G2NF52E42
Customer brought vehicle in and had complaint of intermittin no start always cranks good but sometimes just wont start normally cold or after sitting for a while, but the strange thing is if you disconnect the battery and reconnect it it fires up right away an...
2001 Saturn SL1 1.9L battery light VIN: 1587452
we have a 2001 saturn sl1 that the battery light comes on when driving .the cust. states that she starts the car and the light will stay on some times and than it gos out. we have replaced the alter. two times and also have checked the wires we have also repla...
2001 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZJ527X2
all data diag says check voltage we have 5vdc reference, jump wire check for fuel pressure voltage nothing, ohm out wires from i/p connector and pcm all ok still cant get reference volt to fp sensor please help!!! Trouble codes: P0442 (small evap leak)

Fixes & Summaries for GM
Fix/Summary Answers
1985 Cadillac Seville 4.1L shift VIN: 1G6KS6987F
thanks to all who responded. ended up being pressure regulator, also there was gunk build up in the valve body that had to be cleaned out.
1988 Chevrolet K1500 Silverado 5.7L Poor Idle Quality, Stall VIN: 1GTFK24K3J
Thanks to everyone who responded. I checked everything that was suggested but still was unable to get the truck running any better. I decided to pull the intake manifold to look for trouble. The EGR passage has a chunk missing out of it. I am certain that this...
1997 Chevrolet Blazer 4.3L Misfire, spark knock VIN: 1GNDT13W4V
It looks like this one is fixed. I have been waiting to close this because the fix is hard to believe and wanted to make sure it was really fixed. We had lots of replies on this and several mentioned cam retard. I had already checked it and forgot to include t... Trouble codes: P0300.
1999 Chevrolet Corvette 5.7L Dash illumination VIN: 1G1YY22G1X
Well, I don't have much of anything good to report. Our shop doesn't feel the need to have proper factory scan tools so we sent it to a Chevy dealer. The tech there couldn't communicate with the BCM so feels that is where the problem lies. I COULD communica...
2000 Chevrolet S10 Xtreme 2.2L No Start, fuel delivery VIN: 1GCCS1942Y
To those of you that responded, you are the BEST. High school auto/101, "check powers and grounds", I "blew it off", can't be.. This S-10 had some transmission work done, before we got it. Battery block ground LOOSE, grounds 103/105/108 LOOSE or not CONNECTED...
2003 Chevrolet Tahoe LS 4.8L Electronic VIN: 1GNEK13V03
Install New Transfere Case Module & Re-program it & everything is fine, Thanks To everyone who helped in this matter
2003 Chevrolet Avalanche 1500 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GNEK13T13
Well this one is for the books! Thanks to all who helped us, especially John(Calif), Shaharazed(N/york), & Mike(Louisiana)who really got us thinking. The post that really nailed it was from a few months ago in the tech. discussion forum(may take time, but it p... Trouble codes: P0300.
1996 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 3G2J35249T
A new fuel pump with a tank pressure sensor AND an additional wire harness to allow the sensor to be connected to the car repaired this vehicle. Thanks to Randy Briggs our local CTI trainer for stating “Fix what you know is broken, and then continue on”. The... Trouble codes: P0440 (Canister Purge system fault).
2003 Saturn Ion-1 2.2L blower motor VIN: 1G8AF52F03
My customer declined to repair vehicle I do believe the Bcm is bad but we cant find one used , and the price for a new one is 600 one of the post says replace resistor this is wrong there is no power to resistor at all . one says replace switch but there is no...
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