Lethargic 4.6
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Joined: Jun 2004
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From: Seattle
Lethargic 4.6
I wanted to spice up my '97 F150 XLT 4x4 4.6l a bit so I put a 3" exhaust with a Flowmaster muffler; upgraded the wheels and tires (They are 1" larger in diameter) and programmed the Superchips to "Performance". It looks and sounds like a million bucks, and she ran like a raped ape for a few months then developed a bad case of the pings and in general is just doggin' it.
This is one well cared for truck; always ahead of the maintenance schedule (by dealer).
Now, any idea why it would perform so well out at first and slowly peter out?
This is one well cared for truck; always ahead of the maintenance schedule (by dealer).
Now, any idea why it would perform so well out at first and slowly peter out?
Postmaster
Joined: Apr 2002
Posts: 3,613
Likes: 6
From: Coal country
I would first suspect EGR failure - or impending failure first.
Next, I would consider a clogging fuel filter.
(Notive I didn't say EGR "valve." The Triton EGR system has a bad habit of plugging up the passages in the intake plenum, or of the DPFE sensor going bad.)
Next, I would consider a clogging fuel filter.
(Notive I didn't say EGR "valve." The Triton EGR system has a bad habit of plugging up the passages in the intake plenum, or of the DPFE sensor going bad.)
Last edited by Racerguy; Mar 3, 2006 at 11:40 PM.
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tommytorino
Modular V8 (4.6L, 5.4L)
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Mar 13, 2004 11:09 AM
