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Correct RPM's at idle

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Old 10-22-2014, 06:32 AM
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Originally Posted by xrider
Yes I did. AAMOF, I'm the one that drug that thread up from 2007. Definitely made the engine sound better, but no effect on the idle. Do you know what the correct rpm's should be? Maybe I need to take it to Ford and have them reflash the PCM.
Clean your throttle body and MAF...this will help
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Old 10-22-2014, 10:13 AM
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Originally Posted by techrep
Clean your throttle body and MAF...this will help
Did you read my original post?
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Old 10-22-2014, 12:08 PM
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Originally Posted by xrider
Did you read my original post?

Not good enough...sorry my 5.4 idle's @ 600 rpms at operating temp...smooth as silk.
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Old 10-22-2014, 02:16 PM
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Factory is 550 rpm it can be changed with a tuner like sct or edge. I bumped mine to 650 rpm with mine. Rough idle usual suspects are:
1) foam gasket that sits on the face of the filter tray.
2) vacuum leaks.
3) crappy plugs
4) bad coil pack (cop)
5) dirty throttle body or mass air flow sensor.
6) plugged up cat. (Use an infrared temperature gun to isolate it)
7) butterflies for the intake manifold runner control dirty or bringing up in the wiring harness usually tripping a p2004 or p2006 code.
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Old 10-22-2014, 03:05 PM
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Originally Posted by techrep

Not good enough...sorry my 5.4 idle's @ 600 rpms at operating temp...smooth as silk.
Will I have to set my Evo back to stock and disconnect the battery to clean the MAF and throttle body?
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Old 10-23-2014, 07:05 AM
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No...
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Old 10-23-2014, 06:26 PM
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Originally Posted by techrep
No...
Was this reply to me? If so thanks I will be getting some MAF and throttle body cleaner tomorrow also how often should I change the PCV I have the heated one
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Old 10-23-2014, 06:58 PM
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Yes ... it was for you
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Old 10-23-2014, 11:00 PM
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My 04 Idles in gear at 500-520 rpm, but very smooth, not rough at all. I was amazed the first time I heard it... normally, V8's would be around 650-700.
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Old 10-23-2014, 11:20 PM
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Originally Posted by JKRIFX4
My 04 Idles in gear at 500-520 rpm, but very smooth, not rough at all. I was amazed the first time I heard it... normally, V8's would be around 650-700.
Mine idle's at 650 when warm 750 when cold
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