× 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 16, 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
1991 Buick Century Special 3.3L No Start VIN: 1G4AH54N8M
had injector once in awhile when it did start sometimes touch throttle and it would die replaced tps,ign module 3 differnt computers engine wiring harness crank sensor tried unplugging each injector check ground at computer still no start thanks tony
1995 Chevrolet Camaro Z28 5.7L heater /low coolant VIN: 2G1FP22P5S
car losees anti freeze and heater dont work
2001 Chevrolet Impala 3.8L instrument cluster VIN: 2G1WH55KX1
this vehicle had (still had) a problem with a no-start condition and message center displaying all problems. E.g. battery light,low tire pressure,service vehicle soon,etc. I repaired BCM connectors (per GM TSB) to hopefully take care of this problem. The car...
2003 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDT13SX3
the customer is complaining that the check engine light is coming on after 2 days of driving. i ran thru mitchells tests and determined the cam phase acctuator was sticking when cold. the vehicle has since returned with the same code and i have seen the cam ph... Trouble codes: P1345 (cmp/ckp corralation problem)
2004 Chevrolet Suburban 1500 Z71 5.3L Stall, MIL Lamp on VIN: 3GNFK16Z44
Good customer brings in vehicle with the complaint that sometimes door locks cycle, speedometer stops working and reduced power appears in the message center. When this happens he couldn't drive over a couple miles per hour. After a little research here on IAT... Trouble codes: C0207 (tps or rear wheel speed sensor)
2006 Chevrolet Impala LT 3.9L pcm, tcm VIN: 2G1WC58146
customer stated door locks would lock and unlock themselves while driving, service manager experienced it, I have not experienced it. Traction control light came on. I think she said gear indicator on dash was changing from Drive to Park. It shows each gear bu...
2006 Chevrolet Silverado 3500 WT 6.6L cruise, pto idle up VIN: 1GBJK39D46
Ok guys here is another weird one. This truck came in to the shop with the cruise control inop and the idle up feature for the pto was inop. Here is what the technician checked. With the Tech 2 connected we watched the cruise and brake switch outputs the cruis...
1990 Geo Prizm GSi 1.6L MIL Lamp on VIN: 1Y1SL5451Z
any time at all check eng light may pop on no drivability problems mpg always 32-34 light may stay on for weeks or off for weeks sometimes on right from a cold morning start sometimes not if not warmed up for like 4 min in the morning trans wont shift into 4t... Trouble codes: 25 (lean), 26 (rich)
2001 GMC W3500 5.7L No Start, Cuts out, Stall VIN: 4KDB4B17R1
HELP!!! Afternoon everyone. This truck is breaking the bank here. The truck, though a GMC, is an Isuzu platform with a GM power train 5.7 L Vin coded R. Came in two weeks ago with a no/hard start, lacks power some times and will stall some times. After going o...
2003 GMC Sierra 1500 4.8L Extended cranking VIN: 1GTEC19V73
One for you Goodwrenches out there.Extended crank and P0342 code. I have 12v on the reference wire, a good ground, and 0v on signal wire at cam sensor with it unplugged. Good continuity from pcm to cam sensor on all 3 wires. According to Mitchell there should ... Trouble codes: P0342 (Cam sensor signal low)
2004 GMC Envoy XL SLE 4.2L n/a VIN: 1GKDT13S84
This Truck has four wheel in the Auto setting, 4Lo setting but does not work in 4Hi setting. In 4Hi the front drive shaft does not rotate. I'm thinking it is the shift motor, but just want to verify. The shift motor does shift, I can here it and obviously it s...
2004 GMC Savana 3500 6.0L oil consumption VIN: 1GJHG39U34
customer used 2 quarts of oil in 1600 miles. vehicle is used for a family vehicle, not work. #1 & 3 spark plugs are crusty and brown. other plugs look normal. they are oem. vehicle does not have a pcv system, just a tube from left valve cover to top of intake....
2000 Oldsmobile Alero GLS 3.4L intake manifold VIN: 1G2NF12E9Y
have cracked 3 upper intakes already, tighten to spec and cracks everytime on clyinder 3 spec is 25nm can sure use the help thanks in advance jose
1989 Pontiac Bonneville LE 3.8L engine noise VIN: 1G2HX54C7K
auto came in shop with engine noise. like balancer was wobbleing. it was. changed harmonic balancer and noise was alot better. but still thare. sounds like its coming from harmonic balancer. i put a new one on. disconnected flywheel and noise is still there. c...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Park Avenue 3.8L Hesitation, Cuts out, Extended Crank VIN: 1G4CW54K61
Thanks for all the replies. The Knock Sensor codes have not reset and the car is running fine. All responses make sense as far correlation between ignition timing and spark knock go. What doesn't make sense is that the knock sensor codes set are based o... Trouble codes: P0336 (Crank Position sensor Per formance), P0327, P0332 (Knock sensor 2).
1990 Chevrolet C1500 Silverado 5.7L Excessive Emissions, Poor Idle Quality, Misfire
Well this thing needed a distributer and a coil, From what I was told he ended up going somewhere else to have it fixed though Thanks for all the replies
1996 Chevrolet K3500 6.5L cruise control VIN: 1GBJK39D46
Guys I have to repost this because I goofed at the time of the original post and I beleive this hurt the response that it got. I put in that this truck was a 96 when it is an 06...sorry for the waste of space.
2002 Chevrolet Tracker 2.0L Steering VIN: 2SWUW11AX3
Thanks to all who replied. I did pinch off the pressure line and loosened the pressure line and after getting a power steering oil bath I determined the pump was good. What I found was the steering sector shaft joints were bad. The guy at the salvage yard sugg...
2002 Chevrolet Trailblazer LT 4.2L Charging VIN: IGNDT13S72
thanks to all techs, i am alone in my shop so it is nice to be able to bounce ideas off other mechanics. i ended up calling the delco phone number and they said pretty much all that was said in the responses as well that the delay in normal in cold wether and ...
2002 Chevrolet Silverado 2500 HD 6.0L No Start, Poor Idle Quality, Stall VIN: 1JBHC24UZ2
thank you too all those who replied the fix on this truck was a passkey sensor.The yelloy wire on the passkey sensor was 5v conscant. On the new sensor voltaced changed when cranking. After doing a passkey relearn on the bcm the truck started. Thaught that the...
1997 Pontiac Sunfire GT 2.4L 3-4 slips lots VIN: 1G2JD12T8V
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next