Burnt valve? - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 04-01-2013, 08:30 PM Thread Starter
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Burnt valve?

When I took my truck into the shop for weak accleration and amiss the shop replaced injector 7 and that really helped but the truck still has miss between 1100 and 2000 rpm once the truck starts to warm up. I do not think the shop did leak down test but said they could see I had a burnt intake valve. Has anyone had any experience with a burned intake valve and what are the symptoms. I talked to another shop and they said they hardly ever see burnt valves in the 7.3.

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post #2 of 3 Old 04-01-2013, 10:12 PM
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There could be a TON of things causing a miss. For the most part, 7.3's rarely ever have valve issues. Your miss could easily be an IPR, low fuel pressure, other weak injectors, low compression, ICP sensor, IDM, and many other things.

97 F-250 ECLB 7.3/E4OD/4wd, 216k miles: FFD 250/200%'s, stock turbo, built trans, e-fuel, Swamps IDM, shimmed 910's, Melling LPOP, welded cam gear/modified pick-up tube. Built and tuned by me

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post #3 of 3 Old 04-02-2013, 09:40 AM
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The first shop is full of cr*p. There is no way you can see a burnt valve unless the head was off. If it was a burnt or bent valve it would have a very distinctive miss all the time. As Jimmy and the second shop said the 7.3s very seldom have any valve problems.

97 F250 Xlt, built E4od, D60 swap, Baby swamps, tunes by Dp
1.0 turbo housing, 203* t-stat, diy 6637, 4" exhaust
Diy intercooled, 6.0 fan, Diy 140v Idm, Isspro Ev gauges
On board air,E-fuel, 5" lift on 35's
320000 miles
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