× 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 February 12, 2010
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
1989 Buick Electra Park Avenue 3.8L MIL Lamp on VIN: 1G4CW54C8K
i've worked on this buick for a long time,and it's got me chasing my tail this time!customer called and said check engine light came on while driving,and comes on as soon as the car is started every time.i did a code scan and found the old familiar "41".i've b... Trouble codes: 41 (cam signal)
2002 Buick Rendezvous CX 3.4L oil pump VIN: 3G5DB03E32
vehicle was towed in for no movement, I check the fluid and it was clean. I took a oil pressure reading and found it to be 0. I disassemled the transmission and found the oil pump to be broken in the torgue converter. I can see that the shaft was stressed befo...
2001 Cadillac DeVille 4.6L No Start VIN: 1G6KD54Y31
hello everyone .i have a cadillac deville that intermittently does not crank for customer.all gauges are lit up and has good battery voltage.starter does not click or do anything.vehicle will not start whenever it wants to .vehicle has codes b1327 low voltage ... Trouble codes: B3055, B1327
2004 Cadillac CTS 3.6L Misfire, MIL Lamp on VIN: 1G6DM57774
Car originally came in for check engine light and poor running.Pulled car in the shop-no engine light and running fine.Hooked up scanner and had history codes-p0205-p0300-p0304-p0305-p0318.Told customer I would like to check condition of plugs-Pulled plugshad ... Trouble codes: P0205, P0305
1994 Chevrolet Astro LT 4.3L Poor Idle Quality, Misfire, Poor Fuel Economy VIN: 1GBDM19W3R
Greetings G.M. techs.I've aquired El Diablo (the devil) This thing is eating my lunch.This van has been posted before but the customer decided that he would try to fix it himself! Van came back to me.S#$! The first time that it was here,we found that the fuel ...
1994 Chevrolet Caprice Classic 5.7L Poor Idle Quality VIN: 1G1BL52P8R
according to on demand ,, the 4.3 v-8 uses peak and hold fuel injectors ,,, they were leaking,,and i failed to get waveform before i replaced them... my question is ..i used amp probe and scope to look a injectors .. . injectors provided waveform looks like re...
1995 Chevrolet Cavalier 2.2L fuel odor in car VIN: 1G1JC1245S
This started as a no-start, another garage replaced ignition module. Fuel odor in car began at this time (jan/10). Car was sent back to same shop for odor and fuel pressure regulator was replaced. Odor still remained. One month later (feb/10) car was brought ...
2002 Chevrolet Silverado 2500 HD 6.0L No Start, Poor Idle Quality, Stall VIN: 1JBHC24UZ2
i have a 2002 c2500hd and this truck will start and run for a few seconds and shut off cam and crank sensor have a good waveform at pcm. when cranking i have good spark and good fuel pressure. the injectors get a prime signal and that is it no polse after that...
2003 Chevrolet Impala 3.4L radio lighting VIN: 2G1WF52E43
Need help from the best!!! Here is the saga - car came to me from one of my sister stores a year ago - had BCM that would not communicate. Diagnosed it, replaced BCM and had programmed at a repair shop that owns a tech 2. No issues for about 3-4 months. Someth...
2006 Chevrolet Express 3500 6.0L engine VIN: 1GCHG35U56
hello thanks in advance.. we have a 6.0l engine here with a squeaking noise that gets louder as the engine gets warmer. has good oil pressure, when the engine is cold at first start it has a slight chirp like from a belt but after several min. the chirp gets q...
1996 GMC G3500 Vandura 5.7L Misfire, Rouch Running VIN: 1GTGG35K6T
FYI, this is a new request on a vehicle that we previously had a request on. The symptoms on this vehicle are very specific and easy to duplicate. Under very light load or cruise at around 20-30MPH, the engine runs rough (misfires) and there is a popping in t...
1997 GMC Sonoma SL 4.3L Cooling Systems VIN: 1GTDC14Z2K
hi all need a little help with this truck.this truck will not warm up.the engine will run about 190 degrees driving.when you check the temp in the radiator it will be about 117 on one side and 75 on the other side.the heat in the truck is just warm.when we co...
2003 GMC Savana 2500 4.8L Mechanical VIN: 1GTGG25V73
Thanks in advance . This vehicle pulls slightly to the right on light braking which is the concern ,on harder braking there is miniscual amount of pulling ? The front wheels spin properly , no rotor rubbing or caliper binding . The front brake pads ,rotors,c...
1988 Oldsmobile Delta 88 Royale 3.8L Stall VIN: 1G3HN14C2J
Ok this car is stumping me need help! Vehicle dies when hot, doesnt stumble or have a hesistation. Had a code in system code 42 electronic spark timing (EST) problem. Ran a tap test on igntion module and car died maybe just a quincidence. Replaced ICM and veh... Trouble codes: 42 (Electronic spark timing EST problem)
2001 Oldsmobile Alero GL 2.4L Starting VIN: 1G3NL52T51
Hey everyone have a vehicle that has a very intermittant no start condition. Ran test first time vehicle was in and noted vehicle had spark and no fuel. Inspectedfuel pump and noted pump recieving the proper signals and voltage. Replaced fuel pump and filter a...
1991 Pontiac Firebird 3.1L speedometer VIN: 1G2FS2381M
The customer complaint is that the speedometer is inop until the car has been driven about 4 to 5 miles.My first thought was the gear slipping on the trans output shaft but it was tight.The gear on the speed sensor looked good.I tested for AC voltage and got a...
2005 Saturn Ion-1 2.2L Engine VIN: 1G8AG52F65
Guy came in with a no start problem so i did a battery and charging system test the battery failed so we replaced battery, it was all good then he came back for same problem and did some basic testing and found the pos cable @ battery was like at 6 volts and c...

Fixes & Summaries for GM
Fix/Summary Answers
2005 Cadillac STS 3.6L Starting VIN: 1G6DW67735
Thanks everyone for all your help. Seems that the vehicle had tried to be started numurious times with a dead/weak battery, so the spark plugs got flooded. I changed the spark plugs and the vehicle fired right up. Has been working great since then. Thanks ever...
2004 Chevrolet Express 3500 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1CGHG39U44
After testing and retesting I found the exhaust valve was seeping air during a leak down test. Also that cylinder had the lowest compression 150 psi. All the others were between 160 and 175psi. Though well within spec I think at Idle ( below 700 rpm) it would ... Trouble codes: P0300.
2007 Chevrolet Silverado 2500 HD Classic LT 6.0L Misfire VIN: 1GCHC23U77
After several more days of testing we found that the shop that did the head repiar had installed an intake vale that wa just slightly longer on the stem. we ground down the top of the stem just a tiny bit and all has been great since. Guees even the best can m... Trouble codes: P0200 (injection control fault), P0300 (random cyl misfire).
1993 GMC G3500 Vandura 5.7L Electronic VIN: 1GDKH32K2P
Thanks to everyone for you're help found a pinched harness above the steering colum, lowered the column and rerouted the harness after the repair runs and shifts perfectly. Thanks again everyone
1996 GMC Sonoma SL 4.3L abs module VIN: 1GTCS14XOT
removed both front rotors and found the excitor rings covered in grease and debris. cleaned the rings and sensors, but this did not solve the problem. by replacing the ebcm solved this problem. thanks for the help. god bless all iatn members.
2007 GMC Yukon XL 2500 SLT 6.0L Starting VIN: 1GKG26K97R
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next