× 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 2, 2009
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
2004 Cadillac DeVille 4.6L Misfire VIN: 1G6KD54YX4
Sorry for long post on related repair history but as you can see I am chasing my tail on this one second request for help in 2 years since being with iatn, give me a hand,guys and gals that is the first request the second is ,firing order is confusing to me ,i... Trouble codes: P0300, B
1991 Chevrolet K2500 Cheyenne 5.7L Poor Idle Quality, Hesitation, Surge, Cuts out, Misfire, VIN: 1GCFK24K3M
vehicle when cold feel a missfire but very few quick hit or two. after 30 seconds runs good. drove 18 miles no problems. next day drove again and warmed up 205 temp 9miles under load starts popping back thru intake. no trouble codes integrater and block learn ...
1993 Chevrolet Lumina Euro 3.1L Surge, Cuts out, Stall, MIL Lamp on VIN: 2G1WN54TXP
vehicle surges intermittly at idle and stalls.and sets code 44 exhaust too lean. Crank sensor, O2 sensor and AIS have been replaced. Fuel injectors cleaned. Vehicle runs normally otherwise. Trouble codes: 44 (lean exhaust)
1997 Chevrolet Blazer 4.3L Unknown VIN: 1GNDT13WKV
Hi iATN members and thanks in advance for responding to my help. When vehicle is first started (Cold) and driven between 5 to 20 MPH,when you apply the brake, the pedal pulsates and you can hear the brake motor run for a second. This only happens 4 or 5 times ...
1998 Chevrolet K1500 Cheyenne 5.7L head/ tail lights VIN: 2GCEK19R3W
This vehicle came in to us with no headlights or tail lights. The running lights in the front come on with the switch but thats it. No highs or lows, no tails. When you have the switch turned on and try to use the turn signals you get a fast flash, just like w...
2002 Chevrolet Monte Carlo SS 3.8L Headlights VIN: 2G1WX15K62
Hi fellows, This car intermittantly loses headlamps. I have never been able to duplicate. Has anyone had experiance with this and suggest the most likely problem? We replaced headlamp switch & relay with no success.
2002 Chevrolet Express 1500 5.7L abs module VIN: 1GBFG15R62
I have a code for a c0065, (pump motor relay circuit open). I have not seen another post using this trouble code. When the engine is running the data stream for speed sensors are crazy. Jumping all over from -3400 mph to 255 mph. The mil lamp status is also os...
2002 Chevrolet Impala 3.4L No Start VIN: 2G1WF52E12
Here we go folks, This Impala came in as a typical intermitent no crank, security light problem, I put a ignition sensor in and tried to relearn security, No good! Makes it through the first cycle and then light will not stop flashing from there, Further steps...
2002 Chevrolet Silverado 2500 HD 6.6L Misfire, some exhaust smoke VIN: 1GCHK23192
customer complained about exhaust smoke. I noticed a slight misfire in gear and with light throttle. Vehicle has no codes. I can shut injectors off one at a time with scan tool and number two seems to have no change in rpm wiht injector off. Also notice number...
2004 Chevrolet Impala 3.4L wipers VIN: 2G1WF52E04
Hi fellow techs. I have this 04 impala with wipers that will not turn off ever since the wipers were turned on when there was ice on them. The wipers never ran when turned on with the ice on them but after the ice melted off the wiper will not turn off. I insp...
2004 Chevrolet Tahoe LS 5.3L Driver Info Center VIN: 1GNEK13Z64
Hello! I am looking for the procedure to program the drivers information center so it will recognize the steering wheel controls. We installed a reman instrument cluster, and need the programming instructions. We have a Tech2, and have done this before, but ca...
2000 GMC Sierra 1500 SL 5.3L no speedo/tach VIN: 1GTEC19T4Y
customer came in complaint of no speedo or tach and the check engine light on.codes in system po740/po753/po785/1860 well we replaced the ign switch because we have known about the tsb on these.after replacing the ign switch harness all but one code po758 are ...
2001 GMC Yukon Denali 6.0L starter VIN: 1GKEK63U01
customer came in complaining about noise when driving like starter is hitting flex plate at times. customer has already replaced starter and same problem. we went for a road test but could not duplicate noise. when i was shifting from drive to 3rd gear there w...
1998 Oldsmobile Bravada 4.3L no start VIN: 1GHDT13W8W
we have intermitend tach singnal and no start at times. we have fuel pres.koeo 60psi win it starts it runs fine no problems. no codes or anything like that.some times it does start and stall.
1993 Pontiac Grand Prix SE 3.1L Excessive Emissions, Poor Idle Quality, Poor Fuel Economy VIN: 1G2WJ14T7P
This car has a erratic idle. It will run rough and smell very rich and then smooth out and idle at a higher rpm.When it is running bad the map sensor goes up about a volt fuel trims go up to ST 174 LT 156.It apears all you have to do is touch the throtle a lit...
2002 Pontiac Grand Prix GT 3.8L Blower control VIN: 1G2WP52K52
We are a Ford dealer and this loyal customer brought in his '02 Pontiac Grand Prix. I thought it would be an easy fix by replacing the blower speed controller on this manual climate control. It made no change. If you turn the blower off the headlights will t...

Fixes & Summaries for GM
Fix/Summary Answers
1990 Chevrolet Camaro RS 3.1L passkey decoder VIN: 1GIFP23T6L
Thanks to everyone that answered. In this case we had several problems. I thought that there was only problem since the car quit while running down the road. The first thing we did repair passkey wires at the lock cylinder, as well as tighten the classic loose...
1994 Chevrolet g30 5.7L Poor Idle Quality VIN: 1GBJH32K9R
Thanks to all for the help. The customer got very busy, and I only was able to try a few things. I backed the IAC out and the idle went up, new temp sensor no change. At least with the help from you guys I now know what its not. I will have to wait until the c...
2001 Chevrolet Impala 3.4L warning buzzer VIN: 2G1WF52E21
The main problem with the diagnosis here is the lack of theory and operation. Richard [...] hit the nail on the head. The left door speaker was bad. It is important to note: the bcm collects info from the various switches (key in, ign on, doo...
2003 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHC23113
I deemed this vehicle to be a lost cause and sent it down the road. The various computers would not communicate with my scanner because my 'brick was broke'. The VCI in my Snapon 2500 gave up the ghost. I'm watching eBay auctions to find a reasonable replac...
2003 Chevrolet S10 2.2L Headlamps VIN: 1GCCS19H33
This vehicle is fixed. Thanks to todd, you were right on target. I disconnected the multifunction switch on the steering column and grounded the appropiate wires to the head lamps and they did light up. Therefore, I replaced the multifuncion switch and the DRL...
2006 Chevrolet Cobalt LS 2.2L MIL Lamp on, low power VIN: 1G1AK55FX6
As stated earlier the vehicle went back to the dealer they claimed it was fixed with a flash update. When the vehicle was here I had checked the calibrations and they were up to date, however the complaint was very intermittent, iatn is sending me email tellin... Trouble codes: P1516, P2119, P2431, P2176.
2005 GMC Sierra 2500 HD SLE 6.6L Calipers VIN: 1GTHK23235
Thank-you all who replied, the problem turned out to be the right front brake hose as alot of you had indicated, I am not sure why both wheels were locked up though. We went ahead and replaced the other side after the one on the right,flushed the entire system...
1999 Pontiac Grand Prix GT 3.8L engine VIN: 1G2WP52K2X
The M.A.P. sensor!I had got the car running by removing the converter but it was running extremly rich.The M.A.F.was reading O.K. E.C.T.was working correctly.O2 was reading rich .95 the injector on time was 20ms.at idle[way to high]Normally we are about 29.9 b...
1997 Saturn SL1 1.9L Misfire VIN: 1G8ZG5286V
thanks to all! most with the crank relearn, that i tryed with no luck. swaped injectors, new crank sensor, pulled the intake to check the gasket & the grounds while i was there.with no change. we finally decided it had to be the ecm & reluctantly getting the c... Trouble codes: P0300.
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next