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Chevy Silverado and GMC Sierra Stalling Problem

73 messages,  Last post on Oct 29, 2009 at 8:44 PM

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#69 of 73 Re: 03 GMC SIERRA 4.8 STALLING [pitstop1999] by pitstop1999 Oct 28, 2009 (10:18 am)
Replying to: pitstop1999 (Oct 28, 2009 10:14 am) Ohh ya intake maifold has been a problem in these trucks too. When they get warm the plastic intake expands causing an air leak. Try this to find out... when truck is warm and symptoms are there get a can of carb cleaner, brake cleaner , starting fluid and spray towards the intake area if engine idle increases or decreases thats your problem. oh BTY be careful. ( dont go wild spraying!)
#70 of 73 Re: 03 GMC SIERRA 4.8 STALLING [ndmech14] by jrutkis Oct 28, 2009 (11:58 am)
Replying to: ndmech14 (Oct 28, 2009 9:20 am) i acually found out that it might be your computer gone bad or a bad connection to your computer. i had the same problem and took it to my cousins shop. he ran diagnostics and found nothing so he made a few calls and said odds are its the computer. find out if your computer reset. if not thats prob your problem
#71 of 73 Re: 03 GMC SIERRA 4.8 STALLING [pitstop1999] by ndmech14 Oct 29, 2009 (8:25 am)
Replying to: pitstop1999 (Oct 28, 2009 10:14 am) No engine lights at all. I had the shop run the diagnostic before I replaced the fuel pump and I was getting low pressure and they diagnosed it as a bad pump. I put in a new pump and that fixed the fuel pressure problem but not the stalling. I failed to mention that the line wasn't maintaining pressure before I replaced the pump. I would have to prime the pump about two or three times via the ignition before it would start. That problem went away with the new pump.   I have sprayed throtle bottle cleaner in the intake with the truck running at about 2000rpms and let it do its thing and it hasn't helped.   I reset the IAC by turning the ignition on for 30sec. Turning it off for 10 sec. Then starting it. I was told that was the way to do it.   I'll try resetting the computer again to see if that helps. I plan to unplug the negative and let it sit for about 10 minutes.   I haven't checked the regulator for gas yet, or done a pressure test on the vacuum system either. I might get around to that this weekend.   Anything else you guys can think of? I'll keep trying until it's fixed! Replies to this message: ndmech14 (Oct 29, 2009 8:31 am) obyone (Oct 29, 2009 8:44 pm)
#72 of 73 Re: 03 GMC SIERRA 4.8 STALLING [ndmech14] by ndmech14 Oct 29, 2009 (8:31 am)
Replying to: ndmech14 (Oct 29, 2009 8:25 am) Should I spray the brake cleaner around the intake manifold or by the coupler before the throttle body. Where does the leak happen in these instances? I assume I could just by some RTV sealant and reinstall the manifold with this at the seams to correct the problem? Replies to this message: obyone (Oct 29, 2009 8:44 pm)
#73 of 73 Re: 03 GMC SIERRA 4.8 STALLING [ndmech14] by obyone Oct 29, 2009 (8:44 pm)
Replying to: ndmech14 (Oct 29, 2009 8:31 am) The IAC needs to be removed and cleaned with an electric parts cleaner or better yet replaced. If the truck dies while moving that would be associated with the Throttle Position Sensor.

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