Rough idle.

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May 18, 2011 | 03:36 PM

#11

00gstang

Senior Member

Joined: May 2010

Posts: 598

Likes: 12

I doubt it's the MAF or TPS ...common Ford problems on these trucks are the coils ...did you wash the engine bay recently ?

May 18, 2011 | 03:37 PM

#12

2wd5spd

5 speeds of fast

Joined: Nov 2010

Posts: 187

Likes: 2

From: Kentucky

Quote:

Originally Posted by JimFX4

Don't forget the MAF sensor- it tlls the computer how much ait is coming through the intake. A faulty MAF sensor may tell the computer that you are at WOT when you are idling. This could cause stumbling because of the too rich fuel mixture. If you have a scan tool you can check its performance.

I may be wrong, but if that was the case, wouldn't it throw a CEL for an o2 sensor if the air/fuel was way off?

May 18, 2011 | 03:45 PM

#13

00gstang

Senior Member

Joined: May 2010

Posts: 598

Likes: 12

Quote:

Originally Posted by 2wd5spd

I may be wrong, but if that was the case, wouldn't it throw a CEL for an o2 sensor if the air/fuel was way off?

sometimes the PCM will catch the problem and throw a code, sometimes it won't .

May 18, 2011 | 05:12 PM

#14

harm63

Senior Member

Joined: Apr 2011

Posts: 101

Likes: 3

From: Missouri

Quote:

Originally Posted by 00gstang

I doubt it's the MAF or TPS ...common Ford problems on these trucks are the coils ...did you wash the engine bay recently ?

I have not washed the engine bay at all in the month that I've owned the truck. I wouldn't guess that this engine has been "cleaned" any time recently... that's why I'm bettin' on the TPS..

I owned a '98 a few years ago and the whole rough idle hit after I washed the engine bay one time and it threw the CEL along with it... just not the same situation this time around.

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