× 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 June 7, 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
1989 Buick Electra Park Avenue 3.8L No Start VIN: 1G4CW54C8K
thanks in advance.This one towed this morning as a no start.Check injector pulse and spark.Good injector pulse but no spark.Scan vehicle, no codes no rpm reading.Cust had installed new crank sensor and everything looks right.I thought if the crank was problem ...
2005 Buick Rainier CXL 5.3L oil gauge VIN: 5GAET13M65
Hello, Techs I have this 2005 Buick Rainer in the shop right now with a intermittent loss of operation with the oil gauge in the cluster. The customer states that intermittently the oil gauge will read 0 psi while driving down the road. I, however have not bee...
2005 Buick LaCrosse CXS 3.6L Traction Control,Abs,Veriable Effort Steering VIN: 2G4WE56765
Customer brought wifes car in,she told him that the traction light and abs lights came on.Service abs,trac.off and service veriable effort steering messages on in info center.Happened once to her...Found abs code P0050,r/rear wss malf.Un able to verify sensor ...
2005 Buick LeSabre Custom 3.8L Starting VIN: 1G4HR54K05
This is our week for tough ones. This LeSabra was referred by another shop. Intial concern was that it would not spin over at times. He stated that when it would not start, the AC head would not show display. In the beginning we could not get the car to act up...
1990 Chevrolet C3500 Silverado 7.4L No Start, Stall VIN: 1GCHR33N4L
ECM b fuse was blowing. Now it blows soon as ignition switch is switched on. Isolating gray wire at fuel relay stops this.Fuel module is shown under dash cloose to brake pedel, can not locate it. Unpluged ignition switch, ECM, fan relay and oil switch. Still ...
1997 Chevrolet Lumina 3.1L starting system VIN: 2G1WL52M8V
this vehicle will no crank and of course a no-start from this situation. it has the passkey system, anmd the security light will flash with key on ,engine off and when you crank or try the light just flashes and no action. no voltage at switch terminal of sole...
1997 Chevrolet Cavalier 2.2L timing gears VIN: 3G1JC5242V
Hello fellow Techs, we have done the timing gears on this vehicle 3 times now in the past 16 months. the car comes in again and we have no compression and are about to rip the timing gears out again. As there any reason why the gears would have broken 3 times ...
2002 Chevrolet Express 1500 5.7L MIL Lamp on VIN: 1GBFG15R52
Vehicle came in with CEL on and engine knocking. We installed a new reman engine, new plugs, wires, cap and rotor at that time. When we started it we had a P0300 random misfire code pretty much immediately. Cylinder 4 and 7. Performed Fuel pressure test and fo... Trouble codes: P0300 (Random Misfire)
2003 Chevrolet Silverado 1500 HD LS 6.0L 4-3 down shift VIN: 1GCHK29U23
upshift are all good with scan tool say trans in starting in 2 gear when its in 1 when it shift in to 4 it say that it in park nev when the truck down shift to 3 get a grinding noise that does not go a wait until it upshifts
2003 Chevrolet Impala 3.8L Ac VIN: G1WH52KX39
This impala is a car we sold and now that the weather is hot the customer is complaing that the ac take long to cool the car down. We check the ac and all sees to be working fine excepth that the drivers vent is not blowing out cold air. The pass. Side goes do...
2003 Chevrolet Silverado 1500 4.8L a/c clutch diode VIN: 1GCEC14V73
A/c clutch not engaging, while testing for pwr & grd used t-pins to probe rear of connector and clutch engaged. On inspection for harness side of connector found the terminals spread not making contact with other end. Replaced harness side connector but switch...
2004 Chevrolet Silverado 1500 5.3L Mechanical VIN: 1GCEK19T14
Hello Techs, This truck has a whirring noise, remove drive belts no change. we have replaced timing chain and oil pump and the noise isn't any better. Any thoughts? One of my techs also describes the noise as a constant tinny knock, almost like a broke flex pl...
2005 Chevrolet Tahoe LT 5.3L starter VIN: 1GNEC13T65
new vehicle to us. has anyone experienced an earyl starting condition? starter on this vehicle operates when the ignition key is in the "on" position.
2006 Chevrolet Silverado 3500 LT 6.6L Misfire VIN: 1GCHK39D36
Hi everyone, We have a problem with this truck and have a few questions. First, we have a slightly rough running condition and when accelerated hard it blows out black smoke and there seems to be a knocking/clattering noise in the engine. We have verified tha...
1999 GMC Savana 3500 5.7L Hesitation, Cuts out VIN: 1GDHG31RXX
the truck runs fine when it is at idle but if you put it in gear n try to take off it will not go n starts to make a loud poping sound inside the intake, some times it will take off just fine then do it , i just floor it and it acts like it got a boost of powe...
2000 GMC Safari SL 4.3L Evaporator case VIN: 1GKDM19W54
I have to remove the Evaporator case from this van because the upper line twisted during fitting removal. My question is: I have all the screws and nuts removed that I can find but it seems stuck at the top. The Mitchell On demand is not very definitive as to ...
1998 Pontiac Grand Prix GT 3.8L Surge, MIL Lamp on VIN: 1G2WP12K5W
clear code po171 ,reset fuel trim with tech 2, start engine and as it warms up the o2 voltage starts to drop to about .10 ,then it goes into closed loop and fuel trim rises to 16% slight idle surge and sets po171 has good fuel press and volume 47 psi running ,... Trouble codes: P0171
2006 Saturn Ion Red Line 2.0L MIL Lamp on VIN: 1G8AJ55FX6
originally came in with a bad air pump.No longer see that code.The air pump comes on like it should.Also replaced the air pump relay in fusebox under the hood.Also replaced the secondary air injection relay.All new from dealer.Alldata is not very clear on this... Trouble codes: P2440 (Secondary air injection system switching valve A stuck open)

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac Catera 3.0L MIL Lamp on VIN: W06VR52R0W
Thanks to everyone who helped.Long store short I could not get enough data with my scan tool[genisys] to pin point the cause without guessing.I sent the car to a shop who had a tech 2.Turned to be a defective abs control unit.Scott had mention that these are ... Trouble codes: P0501, P1740.
1995 Chevrolet Camaro 3.4L Cooling Fan VIN: 2G1FP22S8R
Thanks for all the help ended up beiing pcm replaced havent seen car sence. Thanks again sorry for taking so long to close been very busy.
1996 Chevrolet C1500 Silverado 5.7L Misfire VIN: 1GCEC19R6T
Thanks guys for all the help, I came in this weekend and installed a new injector in #5 and engine runs great now. I not sure what was going on but even though fuel was coming out of injector on a balance test it must not have been spraying right. Thanks for a... Trouble codes: P0300 (multiple misfire).
2000 Chevrolet Cavalier 2.2L No Start, MIL Lamp on VIN: 1G1JC5248Y
Thanks for everyone's input. Unfortunately it turned out to be none of the above. After looking at the main harness running along the lower rad support, the ecm, icp and bcm connections and finding nothing, I pulled out the aftermarket radio and found the wiri...
2000 Chevrolet Cavalier 2.4L Poor Idle Quality VIN: 1G1JF12TXY
Thanks for all your replies. The intake gasket was sucking air. Replacing the intake gasket took care of the high idle.
2007 Chevrolet Silverado 1500 LT 4.8L MIL Lamp on VIN: 2GCEK19C97
Thanks for the suggestions. We overlooked setting the Modis up in global OBD which was just enough to peek at the trouble codes and a limited data stream. Truck had P0171 and P0174 which was fixed by a MAF. Still bugs me that a tool like the modis and 2 other ...
1986 GMC C3500 Sierra Classic 7.4L Droning Noise VIN: 1GTHC33W7G
I still have not found the source of the noise but I have eliminated the engine and trans. mounts, exhaust, driveshaft, and fan clutch. Am still waiting for a chance to check the differential but the noise seems to be coming from up front. Vehicle does not hav...
1998 Pontiac Firebird 3.8L Speedometer VIN: 2G2FS22K2W
As it turns out the only (economical)way to "fix" this problem is to re-install the correct gearset. GM does offer a VCI application that allows reprogramming specific items via there TechLine. But, it is available on 2002 models and up. The Tech2 does not o...
2001 Pontiac Montana 3.4L Poor Idle Quality VIN: 1G567T3435
thank to all well i check for vacuum leaks and found some under upper intake so i removed and replaced injector orings. also found idel better butt not grat so i did injector flush and cutomer is back driving he says its ideling good.and will let me no if ther... Trouble codes: P0300.
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next