× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 10, 2005
International Automotive Technicians' Network (iATN) - Members Only
(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
1992 Buick LeSabre Limited 3.8L No Start, NO SPARK VIN: 1G4HR53L1N
This car has no spark no injector pulse We have changed the module 3 times(old one tested bad) crank sensor,crank pulley(stator on pulley was damaged)We can make the injectors pulse when we do a scratch test.3x and 18x referances are their Crank sensor has 3x(...
1995 Buick LeSabre Limited 3.8L shift lock VIN: 1G4HR52L3S
shift interlock does not release, I have checked it has voltage and when I apply the brake it supplies ground but still will not release in any key position engine running or engine off
1996 Buick Riviera 3.8L temperature control VIN: 1G4GD22I9T
This vehicle has dual climate controls. The right side gets down to 40 deg. however, the left side only gets down to 60 deg. Originally suspected malfunctioning blend door. However, removed heater core and visually inspecting blend door operation. Both doors ...
2000 Buick Century Custom 3.1L Air bag light on VIN: 2G4WS52J7Y
Hello everyone!! I have this Buick Century from Hell!!Was bought as a Salvage and given to me to fix.I replaced everything From the bumper to Windshield.I pulled the dash and replaced the 2 front airbags, and the airbag computor (under seat).I had a code for n...
1997 Cadillac Seville SLS 4.6L radio, display in VIN: IG6KY529XV
Customer states the Body control module has been replaced four times at the dealer. Always same symptoms... Radio will turn it self on and off, displays will be illuminated with key off and battery will go stone dead. Customer feels BCM will fix problem. New B...
1993 Chevrolet Corvette 40th Anniversary Edition 5.7L No Start, no serial data VIN: 1G1YY23P4P
could not comunicate with scanner, testing lead to pcm, burnt smell from computer so we replaced it. Still no scan data, re-ran trouble tree and other possibilty was the mem-cal so we replaced it, still no data. Thought maybe the mem-cal had hurt the new pcm s... Trouble codes: 41 (ccm code for ecm serial data circuit)
1993 Chevrolet K3500 Silverado 6.5L Stall VIN: 1GCHK39FXP
Starts cold and runs excellent. At normal operating temp, sometimes after a [...] stop (30-40 min), engine will start and dies, will restart after long crank or letting it cool down more. The fuel pump isn't running, (I have a "92" that does the exact same t...
1993 Chevrolet Camaro Indianapolis 500 Pace Car 5.7L fans VIN: 2G1FP22P9P
hi guys. got this 93 z28 in the shop because the engine runs way up on the temp guage while driving around town. this thing runs normal temp at higher speeds. found a bad main cooling fan motor, so i replaced it. that fan now works when the engine asks it to. ...
1994 Chevrolet K3500 6.5L no symptoms VIN: 1GKEK19S8R
Gm diesel techs: I'm posting this for another shop, I am not a diesel expert. The simple? question is: Does anyone out there know what the TDC offset should read when using a snap-on scanner? He has installed a new injector pump and the truck runs great he jus...
1994 Chevrolet K2500 Cheyenne 6.5L Cuts out VIN: 1GCEK29S5R
fuel solenoid driver is faulty. can anyone tell me if a spec exists for testing the fuel solenoid? not the shutoff solenoid. thank you.
1996 Chevrolet Tahoe LS 5.7L Misfire, MIL Lamp on VIN: 1GNEK13RXT
It's Baaaack! Once again, #3 cycles, but does not flow! The poppet does not appear to be crudding up, and I checked for a poor connection at the CMPI plug by checking resistance between ECU 1 fuse and ECU connector C-1. (only .3 ohms above injector spec, and c... Trouble codes: P0300
1997 Chevrolet K2500 7.4L Poor Idle Quality, Misfire VIN: 1GTGK29J2V
Hi technicians, thank you for your help. This vehicle came in a couple weeks ago with a rough idle when cold. Found injectors leaking down. Replaced leaking injectors and vehicle started fine cold the next day. Customer came back after about a week and a half ...
1998 Chevrolet Venture 3.4L No Start VIN: 1GNDU06E7W
pushed in had new head put on by someone else cranked then started died out right away found code p1671 not sure what this is think needs flash dont know help please! Trouble codes: P1671
1999 Chevrolet Corvette 5.7L right headlight door VIN: 1G35H7Q77H
I received a call from the BIG Boss his corvette headlight door does not open automatically but he can lift it up.the door will close when the lights go out. seeing as this has electric motor for each door I felt it was either a blown fuse or more likely a bad...
2000 Chevrolet Malibu 3.1L electric window motor VIN: 1G1ND52J7Y
This Malibu came in with a left rear window motor not working. Battery volts on each of the 2 wires at the window motor. The window motor will work only in the up position, window motor will not work in the down position even with battery power at motor. We ha...
2002 Chevrolet Silverado 3500 6.6L fuel leak VIN: 1GCJC33112
hi everyone. ive got this 6.6 diesel with fuel in the lifter vally. im in the process of dis-asembely but i think im gonna spill fuel in the process making finding my leak hard. i think its up front in the pump area as all of the higher lines seem dry. any inp...
2000 GMC Savana 3500 7.4L Antitheft VIN: 1GTHG35JY1
van came in last month with b2960 intermittant no start..we found an aftermarket alrm wired into the factory switch so we removed aftermarket system due to affecting resistance of factory syatem..was fine for several days..now back with same problem..we've rel... Trouble codes: B2960
1990 Oldsmobile Cutlass Calais 2.5L Misfire VIN: 1G3NL54U9L
Hi guys, Seems that others had looked into this one with no luck. We ran the normal tests for fuel pressure, scan the EMC, vacuum tests, etc. and haven't had any luck either. After the vehicle is driven a while, the spark plugs are white as ghosts. We have ...
2000 Pontiac Grand Am SE 2.4L Poor Idle Quality VIN: 1G2NE12T1Y
runs great. idles high 1500rpm

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac Seville STS 4.6L Alternator VIN: 1G6KY5294T
Well, tested the L wire and had only .9 volt running, ran through the info on Mitchell, replaced the alternator that the customer had just replaced and now 13.8 volt on L terminal running and it is charging. This was no more than a defective low-buck alternato...
1996 Chevrolet Astro 4.3L No Start, Misfire VIN: 1GNDM19W9T
'The time has come, to say goodbye...' Oh if only car repair was as easy as singing! iatn rules dictate this help request be closed, but I've not given up yet. As it stands the Astro is running with a different VCM, one that causes the ABS warning light to be ... Trouble codes: P0336 (p0339-), P0339 (testing and results).
1998 Chevrolet C1500 Cheyenne 5.7L MIL Lamp on VIN: ZGCK19R8W1
many thanks to all who responded, kevin [...], was right on with his method of checking this truck, someone had replaced the lower intake gasket and squeezed it slightly out of place, allowing an internal vacume leak, replaced the gaskets and truck runs like n... Trouble codes: P0303 (cyl 3 misfire), P0338 (crank position sensor).
2000 Chevrolet Express 2500 5.7L Poor Idle Quality, MIL Lamp on VIN: 1GTGG25R3Y
I have checked all the wiring and scoped the cam signal right at the PCM and can not fault the sensor. Our next step is we are going to get a known good working PCM from a recycle yard and get it flashed at the dealer and plug it in to see what will happens. I... Trouble codes: P0341.
2002 Chevrolet Cavalier 2.2L No Start VIN: 1G1JC12492
I removed pipe from manifold-no change, i replaced spark plugs, wires and coils, and it came to life,(Spark must have been too weak) it does have some timing chain noise-i will inform customer that it will need replaced, it has a idle miss on cylinder #2-runs ...
2001 GMC Jimmy SLE 4.3L MIL Lamp on VIN: 1GDT13WO12
Finally got the vehicle. Tried another mass air flow and problem went away. Before I changed the mass air flow I went through the manual checklist and everything checked okay. As for the low vacuum readings, i found out that on an OTC scanner,map reading on ... Trouble codes: P0101 (mass air flow performance).
2002 GMC Envoy SLE 4.2L Mechanical VIN: 1GKDT13S42
Thanks for all the replys,both customers are taking the cars back to the used car dealers before the gurantee is over.On both of the ENVOY I used the Motor Vac Carvon CLean with no improvement(piston slap)is very common on all the 4.2 engines on cold star.Than...
2000 Pontiac Grand Am GT 3.4L MIL Lamp on VIN: 1G2NW12E1Y
Hello Gang Thanks for the great responses,and Patrick for the detailed info.The fix was a broken red wire inside the connector for the EGR Valve.It is repaired and all is well again. Thanks again Terry Trouble codes: P0403 (EGR Control circuit), P0405.
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next