01 E350 revs up and down when in park after driving around for a while

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supafly - 15 Oct 2006 02:57 GMT

I recently bought this family van and after driving around for a while
and then stopping, I notice the engine revs up and down. I'd say it
only revs up 500 RPM or something- not drastic-, but I'm just wondering
if anyone has had anying like this happen.

I changed all the plugs and coil packs... there has never been a check
engine light. Gas milage seems to be around 9-is that normal do you
think for a 5.4L?

Thanks all in advance.

-supa

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Don - 15 Oct 2006 05:29 GMT

>I recently bought this family van and after driving around for a while
>and then stopping, I notice the engine revs up and down. I'd say it
>only revs up 500 RPM or something- not drastic-, but I'm just wondering
>if anyone has had anying like this happen.

Happens all the time -- usually a vacuum leak. Could also be EGR
valve not closing properly.

>I changed all the plugs and coil packs...

Good maintenance but, of course, will not address "hunting" idle
problem.

> there has never been a check
>engine light.

Does the light come on before the van starts and go off in a few
seconds? Perhaps it has been disabled.

> Gas milage seems to be around 9-is that normal do you
>think for a 5.4L?

In an E350? Yes -- sorry!

>Thanks all in advance.

You're welcome!

Don
www.donsautomotive.com

>-supa

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supafly - 18 Oct 2006 02:57 GMT

Cool Cool

Thanks Don.

Yeah, I did verify that the check engine light isn't taped over or
disconnected!
I'll start hunting for vacuum leak.

***Any chance this leak will lower mpg's?

-supa

> >I recently bought this family van and after driving around for a while
> >and then stopping, I notice the engine revs up and down. I'd say it
[quoted text clipped - 28 lines]
>
> >-supa

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