Ford F150 Forum - Community of Ford Truck Fans
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Ford F150 Forum - Community of Ford Truck Fans (https://www.f150forum.com/)
-   2004 - 2008 Ford F150 (https://www.f150forum.com/f4/)
-   -   Rough idle no power (https://www.f150forum.com/f4/rough-idle-no-power-441744/)

Wetfit 03-13-2019 02:43 PM
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 I’m down to these. The truck has a rough idle and it has no power and shakes like hell when you try to accelerate. What I’ve 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. I’m at a loss, never had a truck I couldn’t fix until I met this ford

techrep 03-13-2019 02:46 PM
I don't see a fresh set of SP546 plugs on your list.

Wetfit 03-13-2019 02:48 PM
Originally Posted by techrep (Post 6127390)
I don't see a fresh set of SP546 plugs on your list.
new plugs were installed

techrep 03-13-2019 02:53 PM
Originally Posted by Wetfit (Post 6127395)

new plugs were installed
Brand ?

Wetfit 03-13-2019 02:56 PM
Originally Posted by techrep (Post 6127404)
Brand ?
Bosch platinum

Wetfit 03-13-2019 02:58 PM
I really have no idea where to go from here

techrep 03-13-2019 03:04 PM
I would pull #8 plug/boot/spring/COP.. swap it to #5 because its easy.. clear DTC's..see if the DTC follows.

Wetfit 03-13-2019 05:42 PM
Originally Posted by techrep (Post 6127424)
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

dukedkt442 03-13-2019 08:21 PM
Originally Posted by Wetfit (Post 6127635)

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).

techrep 03-14-2019 06:14 AM
Originally Posted by Wetfit (Post 6127635)

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


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