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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 26, 2012
International Automotive Technicians' Network (iATN) - Members Only
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Open Help Requests for GM
Help Request Answers
2006 Buick Rendezvous CXL 3.5L instrument cluster, fuel gauge, tach, coolant temp VIN: 3G5DA03L16
Customer brought this one in with a no start complaint, found starting fine, but found security light on after start up, then on test drive Trac off light came on, then fuel gauge, tach, and coolant temp gauges dropped off! a couple of seconds later gauges sta...
1997 Cadillac DeVille 4.6L rack VIN: 1G6KD54YXV
I have a 97 Deville that has steering issues, came in with jerky steering in both direstions and sometimes no assist at all, installed an Advance steering pump and only had power steering to the right, no assist at all to the left, with vehicle suspended it wi...
1990 Chevrolet Cavalier Z24 3.1L No Start
hello all, this one kinda given me a fit, well car towed in for start and cut right off, checked had all signals required to start as it was doing the would loose signal to injectors reason cutting off stalling,,,checked to find injectors bad 4 out of 6 well b...
1996 Chevrolet Blazer 4.3L Pedal VIN: 1GNDT13W1T
Hello all. This blazer is driving me up the wall. Customer came in with no pedal what so ever and a red brake light. Found nothing really coming out of master cylinder. Replaced master and then experienced fading pedal to the floor and red brake light still on...
1996 Chevrolet Impala SS 5.7L odometer VIN: 1G1BL52P3T
Does this odometer have an EE Prom or is it incorporated in the PCM? GM Global only goes back to 1998 so I'm counting on one of you fellow iATN mechanics to have a bit of experience with this concern! Thanks Fellas! BAX
1999 Chevrolet K1500 LS 5.7L No Start VIN: 1GNFK16R9X
This truck is new the owner and no history is known. It came in as no start with major grinding going on when trying to start. (stater/flywheel concern) We found 1 starter bolt broken ,flywheel was bent and had missing teeth. We installed flywheel,(flex plate ...
2003 Chevrolet Impala 3.4L compressor VIN: 2G1WF52EX3
there is no power to the compressor at all.also the scanner shows,no a/c command,when the a/c button is push in the dash, the button light up, but a/c does not engage,I checked the pressure switch there is 5 volts, also noticed that fans are not coming on,if I...
2003 Chevrolet Express 3500 6.0L MIL Lamp on VIN: 1GBHG31U93
This high mileage van has a P0300 and shows consistent misfires on cylinders 5 and 8 when accelerating down the road or in neutral, though no misfire is felt or actually occuring. We cannot complete a crankshaft variation relearn procedure, which is our main c... Trouble codes: P0300
2003 Chevrolet Tahoe LS 4.8L Poor Idle Quality VIN: 1GNEC13VX3
this tahoe has a rough idle gone through multiple tests and repairs with no change in idle quality pullin out hair i dont have please help!!!
2003 Chevrolet Silverado 1500 4.8L Misfire VIN: 2GCEC19V63
I hope you guys can steer me in the right direction because I think I've hit a brick wall.This truck has missfires when cold(or after it has sat for 1/2 hour).Only missfires on the right hand cylinders(bank#2).Cylinder #6 is by far the worst.The missfire goes ... Trouble codes: P0300
2003 Chevrolet Impala LS 3.8L high idle VIN: 2G1WH52K43
car came in with high idle. has had intake gaskets,plenimue gaskets, mass,iac,and tps installed. noticed had 2 volts on tps, unpluged and still had 2 volts. removed iac and closed of ports and has min idle speed less then 400 rpm.
2004 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCHK29284
hoping for some insight , Trouble codes: P0016
2005 Chevrolet Equinox LS 3.4L Misfire, Poor Fuel Economy, MIL Lamp on VIN: 2CNDL13F95
Car came in last Friday night, customer comkplaint is the vehicle has VERY POOR fuel economy. MIL is Illuminated. Retrieved DTC;s; P0300- Random Multiple Misfire Detected. Used SOLUS-PRO Scanner to read live misfire data. Cylinder #5 is misfiring steadily.(eng... Trouble codes: P0300 (Random Multiple Misfire Detected)
2005 Chevrolet Impala 3.8L Stall VIN: 2G1WF55K55
Vehicle came from another shop, has had everything under the sun replaced with new Delco (MAF,MAP,IAC,Ignition module, and Crankshaft position sensor. Vehicle will stall intermitently at idle, (in or out of drive) after running for 10 minutes or so. No codes a...
2006 Chevrolet Tahoe LS 4.8L all VIN: 1GNEC13V26
hello to all iatn members, I have this 2006 tahoe thats been at my shop over a month. the original issue customer came in complaining of was a binding/push feeling in the front end. found slight play in the tie rods and lower ball joints, customer requested al...
2007 Chevrolet Silverado 2500 HD WT 6.0L Hesitation, MIL Lamp on, Reduced power VIN: 1GCHK24K27
Recurring code P0641 (5 volt ref circuit 1).Have seen the voltage drop out for a split second,down to .75volts. Have not been able to duplicate in the shop.tried wiggle tests of the sensors on that circuit.Inspected wiring best as possible without ripping into... Trouble codes: P0641 (5 Volt Reference circuit)
2005 GMC Envoy SLE 4.2L Brake pedal VIN: 1GKDT13S45
Replaced front and rear brake rotors and pads. After they were replaced brake pedal go to the floor when engine is running. Tried bleeding the system several times and tried doing the automated bleed with tech II scan tool and nothing. Has anyone ever seen thi...
2004 Hummer H2 6.0L no cool air VIN: 5GRGN23U14
This vehicle is a stretched limousine and came in with no r134a in it. There are no coach builder stickers on it and the coach a/c is operated by the same compressor as the front a/c unit. I need to know how much refrigerant to install in this unit to check fo...
1997 Pontiac Bonneville SE 3.8L Poor Idle Quality VIN: 1G2HX52K9V
this vehicle starts up fine,idles at about 1200 and starts to rise to about 2500 rpm. i can drive the iac down and un plug it. it will idle at 1000. the tps % is at 9 to 10 the 5 volt refrence is at 5.14to5.40 i have change tps,computer,checked wiring to compu...

Fixes & Summaries for GM
Fix/Summary Answers
2005 Cadillac DeVille DHS 4.6L Charging VIN: 1G6KE57Y05
i had no communicaton to all the module i removed each module indivisually to check communication down the data line found wiring at cluster and and wiring under seat for module has water clean and repair ok thank for all your help thank you guys
2004 Chevrolet Classic 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G1ND52FX4
okay, this one is fixed. Bent valves was the problem. I have to say that this is the first time that I had ever seen a leak down test let me down.(8% with good compression) Bill from Georgia got me thinking...vaccum test was a bit inconsistent, but not what yo... Trouble codes: P0107, P0108, P0300, 03014.
2008 Chevrolet C5500 Kodiak C5V042 6.6L engine
Thanks you to all who helped me narrow this one down. It turned out to be the fuel pump leaking in past the seal behind the drive gear. Swapped pump out, been running two weeks now and no oil growth. Just got another one in here for the same problem, looks ...
2001 Pontiac Grand Am GT 3.4L Power Steering VIN: 1G2NV12E41
Jay from Utah was right on, I replaced the aftermarket pump with a new Delco unit and the problem was solved. I appreciate all the help and suggestions.
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