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Rough idle no power

 
Old 03-13-2019, 02:43 PM
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Default Rough idle no power

05 f150 with a 5.4 three valve motor has issues. I keep getting no 8 cylinder misfire code and sometimes the knock sensor codes. Then occasionally random misfire codes I had many other codes thrown but have replaced many parts and Iím down to these. The truck has a rough idle and it has no power and shakes like hell when you try to accelerate. What Iíve done to it: new VCT both, new cam positioning sensor both, new timing chain with phasers guides tensioners and can gear(did not lock out phasers) new cops, new injectors, new pcm(ecu) tested catalytic converters (good) tested compression (avg150psi). New plugs. New fuel filter. Good fuel pressure, no vacuum leaks. Iím at a loss, never had a truck I couldnít fix until I met this ford

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Old 03-13-2019, 02:46 PM
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I don't see a fresh set of SP546 plugs on your list.
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Old 03-13-2019, 02:48 PM
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Originally Posted by techrep View Post
I don't see a fresh set of SP546 plugs on your list.
new plugs were installed
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Old 03-13-2019, 02:53 PM
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Originally Posted by Wetfit View Post

new plugs were installed
Brand ?
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Old 03-13-2019, 02:56 PM
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Originally Posted by techrep View Post
Brand ?
Bosch platinum
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Old 03-13-2019, 02:58 PM
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I really have no idea where to go from here
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Old 03-13-2019, 03:04 PM
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I would pull #8 plug/boot/spring/COP.. swap it to #5 because its easy.. clear DTC's..see if the DTC follows.
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Old 03-13-2019, 05:42 PM
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Originally Posted by techrep View Post
I would pull #8 plug/boot/spring/COP.. swap it to #5 because its easy.. clear DTC's..see if the DTC follows.
already did that no change at all
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Old 03-13-2019, 08:21 PM
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Originally Posted by Wetfit View Post

already did that no change at all
As in it still misfires, or still misfires on #8 despite swapping with #5? Check plug torque... but using non-Motorcraft plugs opens up the window of a bad plug. Dielectric grease (but not too much). Nickel antisieze (but not too much).

What brand coil? Using non-motorcraft coils opens up the window of a bad coil (I know that one from personal experience).
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Old 03-14-2019, 06:14 AM
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Originally Posted by Wetfit View Post

already did that no change at all
have you swapped injectors yet ?
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