I've got a new problem with my 99 Holiday Rambler MH. Its on a Ford F53 chassis so it has the 6.8 V10. Its been a great engine and still goes down the road fine. But I noticed this past weekend that it has a definite lope when it idles. Hopefully this is an easy fix as we have plans for it over the next few weeks. What might be causing this? Its not throwing a "Service Engine Soon" light.

 

No help yet? I've gotten a few replies on an RV forum, but I would more trust guys here on FTE. Most are saying I might have a vacuum leak. Maybe, but wouldn't a vacuum leak make it miss over the whole RPM range? Its only loping at idle. And I've found this engine doesn't have a Idle Air Controller.

 

When I had an idling issue with my 2003 , the idling RPM was fluctuating . It turned out I had a bad (leaking) hose at PCV . Check all of your hoses, including plastic 90 degree elbow (cracked?) and a rubber 90 degree elbow (deteriorated ?) at throttle .
Good luck,

 

1.) I have my doghouse off and I see what might some good places to check. I have starter spray I'm going to use.
2.) I also see the Idle Air Control. I'm going to take it off and clean it. But I've been told these engines don't have one - what am I looking at? Wish I could get pics to post!!

 

This is what I'm thinking is a Idle Air Control.

Now I've found this:


Could this be my problem? I will put it back the way it should be regardless.

 

The pictures don't look that big on my iphone!

 

Yes. That part with the black round thing is your IAC valve.