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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 17, 2010
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Open Help Requests for GM
Help Request Answers
1995 Buick Park Avenue Ultra 3.8L starts and dies VIN: 1G4CU5219S
Customer complains of starting/dying codes for passlock stored in ecm. Installed resistor in harness at passkey module to bypass key/tumbler. Car worked fine for a couple days, then reset codes p1626, p1629 and starts/dies intermittently. The customer doesn't ... Trouble codes: P1626, P1629
1985 Chevrolet Camaro Z28 Iroc-Z 5.0L Excessive Emissions, Poor Idle Quality VIN: 1G1FP87FXF
Thank you in advance i have been working on this car on and off for 2 weeks. I have replaced the computer and the mass air flow both 2 times because of the injecter pulse at idle it is at 10 to 14 at idle and is just pooring in the fuel if i back the idle scre... Trouble codes: 43
1992 Chevrolet C1500 Silverado 4.3L Surge, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCEK14Z6N
This vehicle came in on a tow. No start problem. Find no spark. Have fuel pressure at 12psi. Replace distributor with new pick up coil and molude. Vehicle runs, but rough and misfire. Check timing, disconnect the pip wire for base timing, then advance it to 20...
1999 Chevrolet Tahoe LS 5.7L MIL Lamp on VIN: 1GNEK13RXJ
This project started out as a random misfire code for cyl 4 & 7 and eventually ended up with a cracked head which was not responsible for the misfire code but moisture activity in the crankcase. New head and valve job still ended up with misfire 4 & 7 code eve... Trouble codes: P0175, P0172
2001 Chevrolet Monte Carlo SS 3.8L blower, DIC VIN: 2G1WX15K31
Customer complant is that A/C blower won't work sometimes when the DIC in the overhead consule is also inoperative. found P1189, P1546, P1585, P1626 and B3128. I check for power and there wasn't any and the blower and then I checked the fuse and it was good an...
2001 Chevrolet Express 3500 5.7L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on, Engine smoke VIN: 1GBHG31R31
Customer complaint of a shake after start up in the morning - check engine lamp was on - customer stated engine would smoke a lot -- found a P0300 random misfire code - I started the truck and it ran smooth, but as it warmed up - it ran rougher and rougher - c... Trouble codes: P0300 (Random misfire)
2001 Chevrolet Blazer LS 4.3L Poor Idle Quality, Hesitation, Stall, Misfire VIN: 1GNDT13W51
This truck is driving me crazy! It has a misfire on Cyl.'s 1 & 2. I have checked compression, Fuel Pressure, & Injector Pulse Waveform. The only thing I can find is cam retard is -9 and of course it won't do a crank re-learn. Yesterday I took off the intake to... Trouble codes: P0300
2003 Chevrolet Trailblazer LT 4.2L Poor Idle Quality, Stall, MIL Lamp on VIN: 1GNDT13S23
This trailblazer idles at about 400 RPM and eventually just stalls. But you have to have the A/C on to create this problem, if the A/C is off it will idle fine. I replaced the fan clutch and wiring harness for the P1481 code and also the coolant temp sensor. T... Trouble codes: 1481 (Cooling fan speed sensor)
2004 Chevrolet Silverado 2500 HD 6.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCHK23204
well folks this truck is back for the forth time. still gives code p2149. intermitant as far as when it acts up. we have replaced all 8 injector pigtail ends and checked all grounds time and time again. i just looked at the GM flash program Matrix with no luck... Trouble codes: P2149
2005 Chevrolet SSR 6.0L Cooling Fans
Does anyone have a wiring diagram of the cooling fan curcuit they could send me? Thanks
2005 Chevrolet Trailblazer LS 4.2L Poor Idle Quality, Cuts out VIN: 1GNDT13S95
Vehicle has rough idle (600 rpm), sometimes drops below and wants to cut out. After sitting, eng. Off, restart then put in reverse, vehicle will die. This is intermit. No mil...
2005 Chevrolet Equinox LT 3.4L High Cooling Fans VIN: 2CNDL63FX5
Further diagnosis found hi cooling fan will never cycle.the ambient temps have been over 100' during this repair.engaged hi fan w/red brick,this heilped vent temp 10 degrees.my vent temp.at idle is around 78,increase idle to 2000 rpm and of of hi side increase...
2006 Chevrolet Silverado 2500 HD LS 6.0L radio&door locks VIN: 1GCHK24U76
Hi everybody please help.When you open the drivers door the radio wont shut off. interior lights stay on and power locks dont work.there are no codes.ive checked continuity from latch assy to bcm.even tried a new latch.bcm still shows closed door.any ideas wou...
2007 Chevrolet Tahoe LT 5.3L cylinder deactivation VIN: 1GNFK13077
This truck makes a clattering noise when it is running in the 4 cylinder mode. It sounds like a bad lifter or broken spring. Do the lifters that are deactivated when in 4 cyinder mode have problems with their internal lock out pin or springs. As soon as it ret...
1999 GMC Jimmy SLE 4.3L broken torsion bar VIN: 1GKDT13W2X
Car came in with left side torsion bar broken up by left front lower control arm. Took awile to get broken piece out from all the rust but it did. Trying to put new one in but having a hard time. Tryed to pry back the cross member that the bar slides into but ...
2005 GMC Envoy XUV SLT 4.2L rear door/window VIN: 5616065300
rear window won't go up or down.i've confirmed that the window regullater has hand geranded,but i can't figure out how to open the rear door.i don't see a handle or latch anywhere.any help would be apreesheated...thanks scott
1997 Oldsmobile Achieva S 2.4L Ets Light VIN: 1G3NL12T5V
Need help on an olds achieva. Vehicle has an ETS light that comes on randomly. Car has no abs codes watch WSS while driving signal never drops out, trac control feels the same whether light is on or not. It does have a P1629 Theft fuel enable-Incorrect/ no Sig...
1999 Oldsmobile Intrigue GL 3.5L No Start, Cuts out VIN: 1G3WX52H3X
Hey guys, this one makes no sense to me. Thats why I'm here. The vehicle originally came in with a stall complaint and two crank sensor codes(p0135/p0138). So I replaced the redundant sensor and relearned the sensor. The car left for two days and came back wit... Trouble codes: P0135, P0138
2001 Pontiac Sunfire GT 2.2L compressor VIN: 123J532451
Hey IATN techs I hope someone can throw me a lifeline. I did not have the car in front of me so the VIN is not right. This Sunfire came in the customer said after driving down the road for several miles the air coming out of the vents would be reduced but co...
2007 Pontiac G6 3.5L compressor VIN: 1G2ZG58N97
This car came to my shop with an odd ac problem. Customer states ac gets warm when stopping or going slow through town. But when driving at highway speed cools fine. I installed guages on car readings at idle max ac low 35 high 140 ambient temp. 75 degrees. Ac...
2003 Saturn Vue 3.0L rear VIN: 5GGZCZ53BO
I got a vue here that thumps from the rear when brakes are applied. I have replaced shoes twice and replaced drums and turned them once. It has no pulsation when I pull the e brake whilel driving. Its got a thumping noise that starts around 25 mph to 0. The no...
2003 Saturn Vue 3.0L No communication VIN: 5GZCZ63B63
Can't get this car to communicate with emissions machine. Not recognizing battery voltage with engine running. 5 other cars had no problem today...both before and after this vehicle. Otc and snapon scanners communicate fine with engine running and not. Anybody...
2006 Saturn Ion-2 2.2L Starting VIN: 1GXA155F06
Hello , guys i hope you can help i have read everything here on my problem and have not seen a fix so here goes. The car came in with a locked up Ing. switch, car was running and would not cut off. I got the engine off and we ordered a new switch assy, New loc...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Century Custom 3.1L Park Mechanism VIN: 2G4WS52J01
thank you all who replied. sorry so long on the update but cust. needed car, and took it. so i found the tab that so many of you mentioned and it fixed the wipers.
2008 Cadillac DTS 4.6L front windshield VIN: 1G6KD57Y88
Well guys its fixed . Lawrence got it right it was a trim molding on the left side of windshield. Taped up the the molding as he had said and drive noise gone. Replaced molding and it was ok. Jason had said to check the balance of the tires and I did't get tha...
1995 Chevrolet Blazer 4.3L Oil Pressure VIN: 1GNPT13W9S
most replies where probably correct,i should have gone the extra distance and had cam bearings replaced.customer decided to drive as is,pressure was a improvement,he seldom leaves town,drives only a couple thousand miles a year.at his age and age of blazer the...
1996 Chevrolet Corsica 3.1L #1 Fuse VIN: 1G1LD55M0T
After an exhaustive search for the chaffed wire we ended up putting a circuit breaker in place of the fuse like Michael from maryland suggested and gave the car back to customer and are waiting for it's return.
1996 Chevrolet C1500 Suburban 5.7L transfer cas VIN: 1GNEK13R4T
i want to thank every body that took time to read my help request, the information provided for you is very apreciated, i tried it, with not good results, no one fuse has a problem, short, missing etc, the last thing is replace the encoder motor, customer does...
2000 Chevrolet Blazer LT 4.3L No power VIN: 1GNDT13W5Y
Sorry for the long wait on closing this but I have been waiting for the customer to return with the truck. I checked fuel flow,volume and dead head pressure all were normal. I smoke tested the intake manifold and the smoke was coming out of the crankcase with ...
2002 Chevrolet Venture LT 3.4L Cooling Systems VIN: 1GNDX03E92
Thanks to all of those that offered suggestions. We believe that the problem is in the stepper motor for the temperature guage in the IPC. ** We released the vehicle to the customer, ordered a set of upgraded X25 stepper motors, and are awaiting the customer t...
2003 Chevrolet Silverado 2500 HD 6.6L hard start VIN: 1GCHK29183
Thanks for all the help. Matthew [...] had the right info, the injectors were bad. customer declined repair at this time.
2003 Chevrolet Trailblazer LS 4.2L Cuts out, Reduced Power VIN: 1GNET16S53
Replaced throttle pedal assemby. Vehicle made trip to CT and back with no problems. Thanks again Trouble codes: 1271 (APP-TP Coralation 1-2 error).
2006 Chevrolet HHR LS 2.2L cruise control, rear wiper, side mirrors VIN: 3GNDA13D06
Thank you for your time, My new clockspring was defective. But as for the other stuff I haven't been able to get back to the car. It is a used car we have & customer cars come first. At least I have an idea of where to go when I do get back to it. Thanks again...
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