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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 13, 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
2005 Buick LaCrosse CXS 3.6L MIL Lamp on VIN: 2G4WE53725
Good morning or afternoon!!! Here we go again, this car is crazy or it could be me. The problem is that it keeps setting a code for the rear o2 heater control. First it set the code po037 check the system , power and grounds are good so we changed the o2 ,tes... Trouble codes: P0037
2003 Cadillac DeVille 4.6L Cuts out, Misfire VIN: 1G6KD54Y43
we replace trans 4 months ago for tc slippage code and other shifting problems.it had air pump code at that time. wasnt to concerned then cause it needed trans.cleared all codes after trans replaced and about every 2 to 3 weeks sets p0410. owner states car bum... Trouble codes: P0410
1993 Chevrolet G30 Chevy Van 5.7L No Start, Stall VIN: 2BGHG31K5P
Hello, This one was towed in its a mini bus. It is a no start. Checked fuel pressure was 15 psi, compression was 125 psi. The timing is good and I am getting good spark and fuel. Thre problem is when cranking it it wants to start and then it looses injector pu...
1994 Chevrolet K1500 Cheyenne 4.3L Cuts out, Misfire VIN: 2GTEK19Z6R
I need some serious help. This vehicle is being a pain. We have already installed 2 a/c delco fuel pumps. A fuel filter. Idle control valve & throttle body gasket. Made a new grd for the fuel pump. Made a new grd for the frame to body. R/r the distributer with...
1998 Chevrolet C2500 Silverado 7.4L turn sicnals VIN: 1GCGC29JXW
hi, i working on a 98 chevy 2500, rite turn sicnal is going fast along wt the haed liths i havent seen this problem for years, i was wondering if some one seen this problem resanly, i tankyou for u help.
1999 Chevrolet Express 3500 5.7L Catalytic Converter VIN: 1GBHG31RXX
This is an Express 3500 Cutaway school bus we are working on. The bus needs a right side (passanger side) catalytic converter GM part# 1503830. After hours of searching and many phone calls, we are told that it is an obsolete part and none exist in the United ...
1999 Chevrolet K3500 5.7L No Start VIN: 1GCHK33R1X
Hi fellow tech i have a real ghost problem with this truck thanks for the help in advance, well this truck was brought to me for a no start. I started by trying to hear if the pump was coming on did not hear nothing and tested for spark had no fuel and no spar...
2007 Chevrolet Equinox LS 3.4L Reduced power VIN: 2LNDL13F77
Hello, this vehical intermittantly throws dtc p0121 and p2135 goes to reduced power mode. Cleaned throttle body and replace air filter clean maf clear dtc ,returned to customer.car returned with same problem.what can i look for on this particular vehical that ... Trouble codes: P2135 (App), P0121 (Tp)
2001 Pontiac Grand Am SE 2.4L 4 way flasher VIN: 1G2NE52T21
vehicle came in with the 4 way flasher clicking after the directional was put on. i know the directional flasher is in the 4 way flasher but i'm not sure if thats my problem or not. need help

Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac Fleetwood Brougham 5.7L brake lights VIN: 1G6DW5273P
Thanks for everyones e-mails it ended up be the turn signal switch.THANKS AGAIN!
1979 Chevrolet Corvette 5.7L door locks VIN: 1Z8749S410
took me a while but between jobs i actually got locks to work,new acuators n pigtails n a lot of wire jumping got them working.was waiting 4 new switches but r working from driver side only.all is good 4 now,customer says good enough n with all the diagrams se...
1994 Chevrolet C2500 Silverado 5.7L Engine VIN: U922312184
I am so sorry, there was a mixed up between year of model. my original help request was for 2003 chevy silverado 4x4 instead of 1994, but the vehicle is fix with replace. My request was problem with coolant over flowing, I received good replies. at the end I e...
1997 Chevrolet C1500 Silverado 5.7L Poor Idle Quality VIN: 2GTEK19R1V
well its just a guess but I believe one of the readers was right about the catylitic converter. After repairing the coolant leak which was the intake and then finding the radiator was also busted and fixing that and replacing the spider unit, the vehicle seem ... Trouble codes: P0300 (MISFIRE CODEtimes), P0430.
2005 Chevrolet Equinox LS 3.4L speed sensor VIN: 2CNDL63F05
tanks for all the help, i fix this one if was the R,F sensor, aperly the conector gets wet and sort out, tanks for the help.
2006 Chevrolet Silverado 1500 LS 5.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 3GCEC14Z56
Thank you for all the great ideas. We removed the plate under the intake manifold to inspect the camshaft. Note with the plate removed one can only inspect the camshaft for cylinders 1,2,7 & 8. We found a defective camshaft (intake lobe, cylinder #1). Once aga... Trouble codes: P0300 (Random misfire detected).
2007 Chevrolet Express 1500 4.3L steering & brakes VIN: 1GCGG29U87
Had a GM dealer diagnosis and replaced power steering pump and lines from pump to brake power boost. Vehicle ok now, thanks IATN
2003 GMC Savana 2500 4.8L Misfire VIN: 1G2CG2AV1C
good day to you all well after the owner returned for further diagnostic time,i was watching the fuel trim on bank 2 and noticed that short and long term fuel trim was reading -9 and -10 and missing on cyl 6 so i found no reason for the trim to be that much of... Trouble codes: P0300.
2003 GMC Sierra 2500 HD 8.1L defroster temp VIN: 1GTHK29623
This one is fixed. John hit the nail on the head. There was many codes in the HVAC moduel but most pointing tward the top blend door actuator motor. We actually pulled the dash pad and were able to drill an access hole in a upper duct to get at the two screws ...
1999 Pontiac Grand Prix GT 3.8L Shift interlock VIN: 1G2WP52K0X
Well, It's fixed and everyone who offered help was correct in one form or another. The key cylinder was the culrpit for the not being able to get the key to turn fully to the Lock position problem but the problem with the engine staying running when the key wa...
2004 Saturn Vue 3.5L transaxle VIN: 5GZCZ63494
Well, Thank you guys, especially Rob and Jesse. I have advised the customer of the information you guys sent me, and am waiting to hear back from him. I will let you know how he makes out when I hear back from him. Thanks. Matt
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