Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 6, 2008
International Automotive Technicians' Network (iATN) - Members Only
Next
(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
1999 Buick Century Custom 3.1L Poor Idle Quality VIN: 2G4WS52M8X
I need some help with this Buick. Runs good, good power below about 2500 rpm and at part throttle. Above a certain throttle opening, or at about 2500 rpm, under load or in neutral, it starts a rythmic idle fluctuation and loss of power that continues until you... Trouble codes: P0449 (Evap system vent control circuit low)
View
1991 Chevrolet Corvette 5.7L No Start VIN: 1G1YY2380M
came in crank, no start. found it to have a hypertech chip installed. removed that-no change. verified fuel pressure-ok aat 48 psi. it bleeds off but maintains enough pressure to start during cranking. found no inj pulse with a noid light. tested tps signal wi... Trouble codes: 41 (hist dtc stored in ccm loss of ecm comm), 54 (hist dtc stored in ccm fuel enable failure)
View
1994 Chevrolet Caprice Classic 4.3L hard to start VIN: 1G1BL52P8R
Hi guys, this one is kicking our behinds. Customer had his Chevy towed in as a no-start. We were able to start it with starting fluid, but it would not stay running. Fuel pressure was 0. We replaced the fuel pump & sender assembly(Delphi part), fuel filter and...
View
1999 Chevrolet Malibu 2.4L MIL Lamp on VIN: 1G1ND52T8X
Just dropping a line to see if anyone has seen a similar scenario. First of all, this vehicle has no driveability concerns whatsoever. It always runs perfect for the customer and for me. The problem is, her tabs are expired, and every time she goes for an emmi... Trouble codes: P2965, P0507
View
2000 Chevrolet Suburban 1500 LT 5.3L No Start VIN: 3GNFK16T6Y
This suburban is kicking my tail! The truck has an intermittent no start problem only after short drives. Initail inspection revealed injector pulse, but no spark from any of the coils. Tested the IC signal at the coils and showed great pattern. Crank and Cam ...
View
2001 Chevrolet Silverado 2500 6.0L abs VIN: 1GCHK24U91
this is my first request for help and i hope it works . this truck came in with abs light on and customer complained the truck pulled to right at stop under 3 miles an hr with abs noise . had wheel speed sensors code on left/right . Replaced sensors from deale...
View
1999 GMC Sierra 2500 SL 6.0L Hesitation VIN: 1GTGK29U1X
Hi to all, This truck has been driving me nuts for almost 4 weeks. Customer came in complaining of an intermittent lack of power when accelerating just after starting the engine or sometimes it would stall when putting in reverse, then restart and it would be... Trouble codes: P0141 (O2 heater circuit malfunction Bank 1 Sensor 2)
View
2004 GMC Sierra 1500 SLE 4.8L Stall, Reduced Power VIN: 1GTEC14V34
Truck will start run fine and then intermittently go into reduced power mode and set P1516 and P2135. It has been happening since 2005 and customer has had this to numerous shops to try to get this resolved. See related repair history. Customer brought unit in... Trouble codes: P1516 (Throttle Actuator Control TAC Module Throttle Actuator Position Performance), P2135 (TPS 1 - 2 Correlation)
View
2006 GMC Sierra 2500 HD SLT 6.6L Hesitation, Cuts out, lack power VIN: 1GTHK23D76
freeze frame data for vehicle is as follows engine rpm 2709 vss 64mph app 1 95% app 2 95% actual fuel rail psi 18188.8 psi baro pressure 13psi des egr position 0% ect sensor 187degF egr position varance -100% run time 00:08:12 iat 2 109 degF ign Volts 13.61 ma... Trouble codes: P0087
View
2003 Hummer H2 6.0L ride control VIN: 5GRGN23U33
Any help would be appreciated.This is a new customer with new vehicle to him.(limited budget,ect.)This vehicle has inter.operation with the ride control,no codes present.this morning ride control worked.manual switch and acc.inflater switch inop.My specialty i...
View
1990 Oldsmobile Cutlass Supreme 3.1L Hesitation, Surge, Cuts out, Stall, dies VIN: 1G3WH54T4L
1990 olds cutlass surpreme 3.1 start with a high idle (IAC), then fix vaccuum leak on PCV, the car problem was it goes dead soon after gear is engaged. TPS sweep at idle .30v at wot 2.0v if u open it manual it will go to o.ov at wot. dash lights will go of...
View
2003 Oldsmobile Alero GL 3.4L Instrument Panel VIN: 1G3NL52E13
New client. Towed in. Running fine and parked vehicle. Will not start. Blows the i fuse in the left interior fuse panel. This controls instrument panel, BFG ACC. I know I have to test further but I was just trying to get and idea about changing instrument pane...
View
2003 Pontiac Vibe 1.8L MIL Lamp on VIN: 5Y2SL64863
Hey there guys. I need some help on this one. This Vibe is 2WD, with ABS. I need to locate the speed sensor on this but I just can't find it. I've looked everywhere. Alldata says top of the transaxle, nothing. There is a spot where it looks like the speed sens... Trouble codes: P0500 (vehicle speed sensor)
View

Fixes & Summaries for GM
Fix/Summary Answers
1993 Chevrolet Corvette 5.7L system fault flashes every 15 seconds VIN: 1G1YY3PXP5
We scanned the vehicle for codes - none were present. We checked ground connections, all were good. We finally disconnected the battery again (this was done before) and left it sit for about 3 hours. When we reconnected, the light was off. Thank you to eve...
5
1996 Chevrolet S10 LS 4.3L Horn VIN: 1GCCT19X0T
The fix was take steering wheel off and clean bearing then lubricate and work in dielectric grease, add dielectric grease to horn cam and contact going thru clockspring. I also added a ground wire column to firewall. This was finished on a Sat morning. Ther...
11
1999 Chevrolet Silverado 2500 6.0L 4x4 VIN: 1GCGK24U4X
Thanks to all,Unfortunatly my scanner was not showing any codes. As most of you suggested the Encoder Motor was the SMOKEING GUN !!! She is back in traffic Thanks Again !!! Ron Quality Cars 4 less
8
2001 Chevrolet Monte Carlo SS 3.8L locks and starting VIN: 2G1WX15K41
Thank you for everyones help. The problem was the BCM. We replaced it and no other problems to this point. Thank you again.
4
2001 Chevrolet Express 3500 5.7L serpentine belt VIN: 1CHG39R011
I put a new belt on and can't see where there was a problem... It has been working for probably 500-600 miles now. I think that maybe the ac should be turned off when starting and then turned on after it starts. That is the only good info that I could come up ...
15
2004 Chevrolet Suburban 1500 LS 5.3L Hesitation, Misfire, MIL Lamp on VIN: 3GNFK16Z34
Thanks to all who replied. It took 3 weeks after i cleaned the grounds to show the symptom again. When it did act up i rechecked the grounds again and noticed the neg battery cable had come loose. Knowing with certainty that this ground was tightened 3 weeks a... Trouble codes: P0352, P0302.
7
2000 GMC Savana 3500 5.7L engine races VIN: 1GTHG35ROY
THANKX EVERYONE FOR THE HELP . AFTER CHECKING TH CIRCUIT OVER AND OVER I FOUND THAT ONE OF THE IAC WIRES WAS INTERMITTENTLY GROUNDING NEAR PCM . WHEN TESTING IT DIDNT SHOW UP CAUSE I WAS MOVING THE WIRING . WHEN I PUT IT BACK TOGETHER IT WOULD GROUND OUT . THA...
10
2002 GMC Savana 3500 5.7L Rear brake locking up, wheel speed sensors VIN: 1GDHG31R62
Sorry, Boss man wanted to cut the losses of this vehicle due to other work that needed to be performed. Customer said they were going to trade in anyway. Some of you sudgested to turn the drums, but I didnt cause the problem would go away when the scan data f...
5
1997 Oldsmobile Achieva S 2.4L No Start VIN: 1G3NL52T7V
I GOT A USED INSTEMENT CLUSTER AND REPROGRAMED THE PASSLOCK SYSTEM.SO FAR NO PROBLEMS THANKS TO ALL FOR YOU HELP Trouble codes: P1629 (theft deterrent no signal).
4
2002 Oldsmobile Alero GL 3.4L No Start, INTERMITENT VIN: 1G3NL52E12
Sorry it took so long to post fix. Finally got vehicle to act up long enough to diagnose issue. Found delay in powering coils and fuel pump relay during crank and koeo. Checked fuse panel and grounds at driver side, along with pcm and bcm connectors; all were ... Trouble codes: U1000 (loss of communication), U1128 (loss of irc), U1255 (loss of class 2 commun.), C1298 (pcm class 2 serial data link fault), P1585 (cc inhibit/cc lamp control circuit).
4
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next