Stumbling After WOT
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More Turbo
Joined: Apr 2008
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From: Indiana
Stumbling After WOT
I have been getting a "stumbling" of the engine after passing or doing a WOT run for testing. After doing so, the accelerator becomes unresponsive for a short bit and then comes back up with a lot of crackle. I had the code checked today and he said it was a P1247, Low Boost. The scanner also showed zero for the boost frequency, though it did show a boost psi value. He swapped out the MAP sensor and it continued to show the same ing. Any ideas as to what to check? I scheduled to take it in Thursday to have the electrics checked out since he believes that is where the problem is.
Forgo to mention, no SES light when this happens.
Forgo to mention, no SES light when this happens.
Last edited by Automator; Apr 24, 2009 at 03:43 PM. Reason: Additional Information:
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Air intrusion in the fuel.
Post Fiend
Joined: Nov 2007
Posts: 9,549
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From: Payson, AZ
Have to wonder if the 1247 code is an old code that didn't get cleared at some time. I would expect an SES light if the 1247 was set. Just thinking out loud.
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More Turbo
Joined: Apr 2008
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From: Indiana
The P1247 did not show up when the engine was put back in 5,000 miles ago as that was part of the checks done after the repairs were done.
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Post Fiend
Joined: Mar 2007
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From: Texas
Sometimes phantom codes just show up. Clear it and see if it comes back. Till then, I'd be checking the fuel pressure under WOT or under heavy load.
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More Turbo
Joined: Apr 2008
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From: Indiana
One of my concerns is the reading of 0 hertz on the boost on the scan unit (it is a Snap-on) and whether or not or trucks actually use that. I am afraid the mechanic may go down the wrong path chasing something that doesn't exist.
Post Fiend
Joined: Nov 2007
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From: Payson, AZ
Find out if that Snap-on will read manifold absolute pressure and/or manifold gauge pressure. I know my AE does. The absolute pressure is the ambient air pressure plus boost pressure and the guage pressure is the boost pressure minus the ambient air pressure, or what a boost gauge would read or at least very close.
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More Turbo
Joined: Apr 2008
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From: Indiana
Update: After installing the HPX, I have tried numerous time to get this to happen again without being able to. I tried numerous times yesterday and it would not stumble. I changed the fuel filter today just to be sure. It looked a little dirty but then I have just started putting in some B-5 and I here that could loosen up some dirt. BTW, I was not running B-5 when this started and just switching to it did not cure it. Any ideas? I will keep trying just to be sure it doesn't come back.
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