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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 1, 2011
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1999 Buick Century Custom 3.1L Poor Idle Quality, Hesitation, Misfire VIN: 2G4WS52M8X
The car idles poorly at cold start for about 30 seconds and then clears up. It seems to surge like a vacuum leak but we have been unable to find any leaks with a smoke machine. The vacuum gauge shows 18 inches of vacuum at idle when its not having the issue. I...
1976 Chevrolet C60 350CID steering pump VIN: CCE616V116
The power steering pump has been replaced and the problem I am having is after I fill reservoir to the proper level and bleed the air out of the system , everything works fine. After driving vehicle and shut the engine off the fluid comes out of the filler cap...
1996 Chevrolet S10 4.3L No Start VIN: 1GCCS19X4T
customer in for intake gaskets performed repair and now vehicle is a no start... vehicle ran well before repair. I have changed full distributor, coil and module... fuel pressure is fine.. has spark.. will not start with starting fluid either... at wits end sp...
2003 Chevrolet Silverado 1500 SS 6.0L Hesitation, Misfire VIN: 2GCEK19N23
This vehicle idles rough but the major concern is lack of power, ses on, I have misfires on 2,4,6,8 cylinders heaviest on 6, feels like the exhaust is restricted but the converter temp seems to be about the same side to side, misfire gets very severe under loa... Trouble codes: P0101 (MAF out of range), P0300 (random cylinder misfire all on left bank even cylinders)
2003 Chevrolet Silverado 1500 5.3L Abs Light VIN: 2GCEK19TX3
Truck has abs and brake light on , no comunication with scanner ... replaced abs module and still have abs and brake lite on with no comunication ... have power and ground to abs module , so where do we go from here any help appreciated
2004 Chevrolet Trailblazer EXT LS 4.2L Poor Fuel Economy VIN: 1GNDT13S34
get a real strong gas smel from rear off car when stoped, started last winter, live in high snow belt in northern mi. have seen a lot of snow from the road slush packed up at the e-vap canister inspected it looks good no codes are set.this is my wifes ride she...
2004 Chevrolet Aveo 1.6L Misfire VIN: KL1TJ62624
Looking for some help on emission failure ..04 Aveo..had used engine installed after previous engine blew a rod ..car has failed e tests since .First tests readings were CO% limit .37 result .58 HC limit 66 result 9 NOX limit 505 result 15 dilution 15.6 High c...
2001 GMC Savana 3500 SLT 5.7L No Start VIN: 1GDJG31R01
OK guys I was called in to program a pcm for this van. The shop said the old pcm was junk. The van was towed in for died whil driving issue. I went to program the remanned pcm and it errored out. When I called gm techline with the error codes for the programmi...
1995 Other GM 4700 .0L final drive VIN: 1HTSCAAMPO
i am not familure with these trans issues and need some ideas. i adjusted the tp and no change. i disconnected the tp maually operated and vehical upshifting is not correct as i would expect. i have heard some are modifying these trans to shift early but dont ...
2006 Other GM h3 3.5L Misfire, MIL Lamp on VIN: 5GTDN13626
this veh. arrived with missfire,seems to be a vacuum issue,cant find any leaks.any ideas? thanks Trouble codes: P0300
1999 Pontiac Grand Prix SE 3.8L MIL Lamp on VIN: 1G2WJ52K2X
P1133 oxygen sensor 1 insufficient switching Trouble codes: P1133 (Ho2s insufficient switching sensor 1)
2006 Pontiac GTO 6.0L Ignition key cylinder VIN: 6G2VX12U26
Ocassionally the key cylinder acts up and will not turn. If you wiggle the key while it is in the cylinder it frees up. This could take a few minutes.or not! there is no way of knowing when it will happen.I am not sure what can be done. or if it can be done wi...

Fixes & Summaries for GM
Fix/Summary Answers
1998 Cadillac Seville STS 4.6L completly dead VIN: 1G6KY5491W
Sorry took me little while to fix this car,finding vtd was almost impossiable but thank to iatn members I was able to get a use one and program it..
1997 Chevrolet Express 1500 5.7L Fuel Gauge VIN: 1GBFG15R8V
This customer needed the van back and I was not able to fix the gauge. I think the buffer module which is located along the dog house on the passenger side changes the ohm reading from the tank to the gauge. When I ground the wire to the gauge it makes a ful...
1997 Chevrolet Express 2500 5.7L No Start VIN: 1GCGG25R4U
thanks to all that answered my request. the pcm was full of corrosion. had actualy came appart in two halves. i replaced with used and starts right up. have trans codes that i will check out. some of the connections were corroded at wire harness may be causing...
2002 GMC C-Series Topkick C6H042 8.1L Service Brakes VIN: 1GDJ7H1E92
The end problem ended up being in several places in the harness itself. One part was under the dash, the service brake switch wire was cut through, that was repaired. Another was the harness to the hydraulics, the feed for the transmission to the EBCM, was fri...
2006 Saturn Relay-3 3.5L intermittent VIN: 5GZDV03196
I think Ray from California nailed it. That something was sticking in the valve body. I did install a Jasper reman unit and all is well. Before sending the core out I did tear it down, for inspection. I could find nothing wrong except for wear on the fricti...
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