I recenlty installed a K&N FIPK for my 2005 4.0 supercab Ranger. After installing I wanted to rev up the engine to listen for any odd sounds, and of course just hear how the new intake sounded. When the engine hits about 3000 rpm in park, or neutral it stumbles/misses, almost like it's going to die. The odd thing is that it doesn't do it while driving, I put the transmission in 1st(automatic) and went well over 3000 rpm and didn't feel or hear any hesitation/misses. I also accellerated quickly a few times(causing rpm's over 4000) over the past couple days and noticed nothing out of the ordinary.

Any ideas on this? Unfortunately I had never reved the engine in park or neutral previously to know if this has always been an issue.

Thanks
Jamie

 

try cleaning the MAF.

 

sounds like your talking about the rev limiter

 

x2. There is a rev limiter at 3K in park or neutral. Ford puts it there because there are "cool" people in the world that like to floor it in neutral and dump it into drive to burn out because they don't know who to burnout properly.

 

Christian is right. Rev limiter. It's normal.

 

I agree I've done this and it's the rev limiter.

 

Rev limiter.

With my K&N, when the wind is REALLY gusty my truck will 'stumble' while sitting still.

Brenton

 

Is there a rev limiter on the OHV? It shifts at a maximum of 5500 rpm but I am pretty sure i can rev past 3000 in park.

 

I don't think there is a limiter on an OHV, my friend used to have one and his didn't have one.

Brenton