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4.6 rough idle

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Old 08-19-2015, 07:49 PM
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Default 4.6 rough idle

Hello I have a 2004 f f150 sxt 2wd with 122,000 miles.


I am having rough idle after warm up; she runs fine, does not stall.

No check engine light on

I cleaned throttle body with spray

I just put new plugs and boots; did not help at all

Has anyone had this problem or know what it is?

Last edited by Mod (Ret.); 08-20-2015 at 05:27 AM.
Old 08-19-2015, 08:16 PM
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Default 4.6 rough idel

Not sure what an idel or a spary is? Maybe u have a faulty corral?
Old 08-19-2015, 08:26 PM
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Lol sorry about that I updated the post



So you think its a bad coil

That would throw at code?
Old 08-19-2015, 09:21 PM
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I'd start with thoroughly cleaning your throttle body and just not spraying stuff in it, then clean your MAF sensor. Have you changed your fuel filter yet? If not, that's a cheap thing that you should do.
Old 08-19-2015, 09:24 PM
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OK I will try that........so ur saying remove the intake and clean it?
Old 08-19-2015, 09:37 PM
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Originally Posted by Fredmsi
OK I will try that........so ur saying remove the intake and clean it?
Also remove the throttle body when cleaning. Did you use throttle body cleaner or something else?
Old 08-19-2015, 10:11 PM
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Throttle body cleaner

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Old 08-20-2015, 05:22 AM
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Default 4.6 rough idel

Originally Posted by Fredmsi
Lol sorry about that I updated the post



So you think its a bad coil

That would throw at code?
A faulty COP will rarely throw a code.
Old 08-20-2015, 04:04 PM
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Change your PCV Valve.


I had the same issue and it helped a lot.


Part #6W7Z-6A666-AA


JT
Old 08-20-2015, 04:25 PM
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OK thx will try it


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