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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 9, 2011
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
2000 Buick LeSabre Limited 3.8L Cuts out VIN: 1G4HR54K6Y
hey guys got one that has me stumped. hard misfire under load. scan tool shows that all cylinders mis at about the same rate. no codes in system. have replaced spark plugs, plug wires, coil packs,ignition module and the 3x cranksensor(the one behind the balanc...
2004 Cadillac DeVille 4.6L traction control VIN: 1G8KD54Y64
Owner stated that when she drives her car and turns the left turnsignal on the Traction Control lamp comes on.We road test the car,above 32mph turning the left or right turn signal on may or may not set lamp off,a sudden acceleration from 52mph up to 65+ will ...
1996 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNDT13W4T
P0446 Keeps coming back and I am not getting and pressure from fuel tank pressure sensor. Replaced sensor, check wiring. I did clear the vac line from engine to canisiter. It had charcoal in it. I also replaced all sensors. Mitchell tells me the PCM might be b... Trouble codes: P0446 (EVAP Blocked)
1997 Chevrolet K3500 6.5L No Start VIN: 1GBJK34F6V
Hi all, have this 97 3500 chev with a 6.5 diesel. Customer towed it in with complaint of no start. Says it had been dying when warm then restart ok . After a while dying became more frequent until simply no start. Cranks great (180 rpm cold ) have smoke ( gra... Trouble codes: P0251 (inj pump A rotor / cam problem), P0370 (timing reference A high res problem), P0238 (boost sensor/ circuit open/ high)
1998 Chevrolet Blazer 4.3L MIL Lamp on VIN: 1GNCT18W4W
Scan tool shows bank 1 sensor 1 inactive and not switching. Replaced sensor and same result. Tested wiring and found everything ok. Hooked volt meter up to plug-in at computer and can see sensor switching. All other wiring (powers, grounds, etc.) test ok as we... Trouble codes: P0134 (Insuffecient activity bank 1 sensor 1 - O2)
2000 Chevrolet S10 2.2L clutch pedal
Does anyone know how to remove the clutch pedal assembly? All data and GM SI states to depress the detents and gives a time of 1.1. Don't see any detents and not much room for a screwdriver.
2000 Chevrolet Monte Carlo LS 3.4L Cyl 1 VIN: 2G1WW12E7Y
I need some help. 2000 chevy monte carolo cylinder 1 has a miss fire. Sound simple well I change the spark plugs gap set at .060 inch,wires and coil pack. I also had a code for the camshaft sensor, had to replace the serpentine belt twice cause it keep breakin...
2002 Chevrolet Silverado 2500 6.0L Poor Idle Quality VIN: 1GCHK29U82
Anytime outside temp is below 55F it has trouble ideling once it warms up it's fine If it's above 55F no problem. Checked coolent temp and intake air temp sensors all reading within range. it worked fine all summer long but as soon as old man winter showed up ...
2002 Chevrolet Silverado 1500 HD LS 6.0L 3-3 shift VIN: 1GCGK13U92
Hi this truck runs good and shifts good except when cold sometimes it won't shift to fourth, scanner indicates 4th gear but it is in 3th 100kms revs around 3000 rpms shift solenoids indicate both on, trans shop told me to try solenoids i have replaced solenoid...
2002 Chevrolet Suburban 1500 LS 5.3L ABS module VIN: 3GNFK16Z32
Hello fellow IATN techs..Customer took truck to another shop where she told them of poor brake operation as well as ABS light was on..truck is very well maintained..they scanned the truck and told her it needed front rotors and pads as well as hubs because the...
2004 Chevrolet Aveo 1.6L no heat VIN: KL1TD52624
we got this aveo that has 170 degree temp outta center vents but only 80 degrees outta drivers vent. same goes for if the mode door is on defrost, hot on pass side and cool on drivers. thanks in advanced for any helpful hints guys.
2006 Chevrolet Trailblazer LT 4.2L No Start VIN: 1GNDT13S46
2006 trailblazer 4.2 was towed to the shop ,it will crank but not start,the blazer was flooded changed plugs ,immediately flooded when trying to start,no spark or very little with spark tester,scanner showes rpm when cranking ,changed crank sensor to be sure s...
2006 GMC Envoy Denali 5.3L engine VIN: 1GKET63M86
truck has low oil pressure run for 5 minutes oil guage goes to o pressure put mechanical guage on truck confirms low pressure put guage at oil pan test port pressure 50 psi ran both guages on truck pan guage will show 50psi while upper guage at sending unit is...
1996 Pontiac Bonneville SSEi 3.8L 60 Ignition Fuse
replace maxi fuse and got dash to relight. found that someone put a diode in two white wires for lock cylinder. Remove diode, car now cranked and started. Check all grounds and harness's. vehicle will intermittently blow 60 fuse. any idea's on what may be caus...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Chevrolet G30 Chevy Van 5.7L Poor Idle Quality, Cuts out, Stall
Thankyou all for your help. It came down to a fuel problem. After a battle to get an accurate pressure reading, I had 0 psi at the fuel tank even with various attempts to increase pressure. The van starting and running on 0 psi threw me off. It turned out to b...
2001 Chevrolet Silverado 2500 HD 8.1L Brake Pedal VIN: 1GCHC23G51
Thanks to everyone who took the time to reply! Most of you hit it right on the head with the master cylinder! After a long extensive drive with the new master cylinder, we're caling this one a fix. Thank you!
2002 Chevrolet Silverado 2500 Custom 5.7L Shifting VIN: 1GCEC24RX2
thanks to everyone of you for your post it ended up to be the pcm thanks again
2003 Chevrolet Suburban 2500 LS 6.0L MIL Lamp on VIN: 3GNGC26U53
Note this vehicle has hydroboost and no vacuum booster. It is fixed!!! After suggestions from IATN, I smoke tested the Suburban again, and did find a leak at cyl 4 as in knowledge base. I replaced the intake gaskets. I retested with my scanner on data. The ma... Trouble codes: P0101 (Maf), P0171 (Lean long term fuel trim), P0174 (Lean Long term fuel trim).
2008 Chevrolet Impala LS 3.5L No Start VIN: 2G1WB58K38
Good news! Car is running . I bought 2 news keys from GM dealers, run the relearn procedure and the car starts after programming the first key. Just before, I talked with AC-Delco technical support and they suggested me to do the 30 minutes relearn instead of ... Trouble codes: P0633 (Theft Deterrent Key Not Programmed), B3935 (57- Transponder Authentication Error), B3031 (00- Security System Controller In Learn Mode).
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