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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 2, 2008
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Open Help Requests for GM
Help Request Answers
1998 Buick Regal LS 3.8L lifter VIN: 2G4WB52K4W
originally car came in w/ blown head gasket. removed cylinder heads sent to machine shop. the machine shop resurfaced heads crack tested and reseated valves. since installation. one of the lifters on back head doesn't want to pump up and is tapping. checked oi...
1984 Chevrolet C70 366CID low power under load VIN: 1GBG701B4E
This truck is an old Coca Cola semi tractor that's been made into a pickup truck and is used for livestock transport. This truck runs well until loaded with approximately 16k worth of livestock and trailer.At 10k it runs well. Once it gets warm it loses power...
1989 Chevrolet K1500 Cheyenne 5.7L Poor Idle Quality, Surge VIN: 2GCEK19K3K
The truck idles poor, the block learn at idle is 140, the block learn at cruise is 150. There are no lean codes. at cruise the O2 voltage goes to 99mV. Adding propane will bring it up. At idle the O2 sensor is around 140 mV. The injector pulse width at idle is...
1992 Chevrolet S10 2.5L No Start, Cuts out VIN: 1GBCS10A9P
Ok all GM genius's this is a postal vehicle, grumman aluminum body built on a chevrolet s-10 frame, so everything is GM) 2.5 THROTTLE BODY FUEL INJECTION, 700 R-4 TRANS, this vehicle will croak out and LOSE IGNITON WHEN HOT WE replaced ignition module and all ...
1996 Chevrolet C1500 5.7L pedal
Hello, I have this chevy here and Im having a hard time getting a good pedal, the pedal is very spongy. Initailly the vehicle came in for a blown rear brake line, easy fix. After repair we could not get a good brake pedal. This vehicle has always been serviced...
1996 Chevrolet Camaro Z28 5.7L MIL Lamp on VIN: 2G1FP32P0T
initally came in with p1441. followed diag flow chart and tells you to replace purge valve. no evidence of carbon contamination. when driving car evap purge will happen after initial warm up every time you give throttle to accel vehicle. after replacing valve ... Trouble codes: P1441 (evap purge during non purge event)
2000 Chevrolet Express 2500 4.3L Misfire, MIL Lamp on, only at idle to 1800 VIN: 1GCFG25W8Y
compression 140 psi on cyl #4 injector balance test equal on all cyls. starts at 68 psi drops to 45 psi missing at idle upto 1800 rpms then stops on misfire counter vacuum gauge at idle is 18 ins. and not bouncing. Trouble codes: P0304
2003 Chevrolet Trailblazer North Face 4.2L drivers door module VIN: 1GNDT13S43
Alright guys, here we go. I got this Trial Blazer that has me unsure if I am going in the right direction. I have diag info below. The problem is I have no operation on the Drivers door module, it does not operate anything. The RF LR and RR wondows all work on...
2004 Chevrolet Colorado LS 3.5L wipers VIN: 1GCCS136X4
vechile come in couple of weeks ago with a wiper problem wipers will only work for 3-4 seconds and will stop were ever the are but they do work on high. on tech 2 wiper switch would show that the voltage would change when switch was opperated. checked wiper pa...
1991 Geo Tracker 1.6L No Start VIN: 2CNBJ18U4M
Hello fellow techs. We have this 91 geo tracker with 1.6l come in with a no start condition. Tested vehicle for spark and none was present. Tested for injector pulse and none was present. Tested crank angle sensor (part of dist)a three wire sensor. Found it ha...
1992 Oldsmobile Custom Cruiser 5.7L Excessive Emissions, Hesitation, Poor Fuel Economy VIN: 1G3BP8370N
Vehicle came in as a no start. We put in a battery and checked system. Would not idle properly. All scan data looks good except for one thing. As soon as it goes into closed loop, it also goes into clear flood mode. I cant seem to find any information that tel...
1996 Oldsmobile Cutlass Supreme 3.1L Surge, MIL Lamp on VIN: 1G3WH12M5T
Car came in with complaint of idle surge after hot restart and SES light on.First time in shop car had a Random Misfire code and EGR position error code.Car had a "Lopey" idle for 5-10 seconds after hot restart and then cleared up.I have seen a number of 3.1's... Trouble codes: P0300, P1406 (EGR Pintle Position Problem)
2001 Oldsmobile Alero GL 2.4L Misfire VIN: 1G3N152T71
This vehicle came in with a misfire cause by the ignition housing. When the housing was replaced the misfire went away, for a short time only to burn through a second and third housing. After the second housing was replaced the module and both coils were repla... Trouble codes: P0300 (random misfire)
1997 Pontiac Grand Prix GTP 3.8L MIL Lamp on VIN: 1G2WP5219V
Have this code p1645 did test as per alldate found no problem as flow chart has any one had this problem and what was the fix Trouble codes: P1645
2001 Pontiac Grand Am SE 2.4L timing chain VIN: 1G2NE12T41
Hey Guys , Didn't have much luck in archives , but let me run this by you . Put in a new water pump , chain , guides, sprockets, and tensioner and we're getting a rattle out of the chain just off idle and then is gone . Went through 3 different tensioners (e...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Chevrolet Astro LS 4.3L Poor Idle Quality, Surge, accelerate by itself VIN: 1GNDM19X72
hello all, sorry about the delay in closing, but we have it fixed, turned out to be a mis adjusted non adjustable TPS, which did not throw a code. after which we had a low idle, and ended up replacing the IAC with another ac delco unit. thanks again to all who... Trouble codes: P0507 (idle speed high).
2002 Chevrolet Express 3500 6.5L speedometer VIN: 1GDJG31F12
thanks for all the helpbut, this one was a tough one. everytime i would scope the back side of the vss to vss buffer i would lose the signal intermittantly. if i disconnected the buffer the sinal would come back strong with good amplitude. i kept looking for s...
2002 Chevrolet Suburban 1500 LS 5.3L Starting VIN: 3GNFK16Z92
2003 Chevrolet Impala 3.4L Hesitation, Cuts out VIN: 2G1WF55E03
i checked and rechecked all the things everyone told me to. the customer looked at his warranty and he had 2 months left. he is taking it to gm. he told me that he would keep me informed
2004 Pontiac Grand Prix GT2 3.8L power windows VIN: 2G2WS52294
Thanks for all the help guys. I've got it figured out. The best idea was the voltage drop across the circuit. Turns out a pin had backed out of one of the connectors. This allowed the 12 volts to pass through. However, when trying to operate the windows, t...
2004 Saturn Vue 3.5L Misfire, MIL Lamp on VIN: 5GZCZ53484
I ended up getting a used ecm for it but it did not fire engine car was sent to saturn with all info I did as well as suggestions from members of this forum (car was taken by customer), they told him all they di was ch...
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