2006 Ford E350 Super Duty random fast idle after warm up

billj

MR BILL
Joined
Nov 14, 2006
Messages
676
Points
18
Location
Winter Springs, Florida
Website
www.billjohnson.info
Make
Ford
Model
E350 Super Duty
Year
2006
Miles
187,500
Engine
5.4 liter
After complete warm up and driving several miles, the fast idle will kick in when I am at a stop, in drive. RPMs will jump to about 1,400 for a few seconds and then slowly drop back down to 750 PRMs where it should be. I have to push the brake pedal down hard when this happens because the van wants to lurch forward. It may happen once a day for a couple days, or it may not do it for a week at a time. This is Florida so the AC is on Max when this happens
 

grcauto

Hero Member
Joined
May 29, 2014
Messages
804
Points
28
IAC valve?
 

Mobile Dan

wrench
Joined
Mar 1, 2002
Messages
3,804
Points
48
Location
Kentucky
Billj, I suggest you shop for IAC and throttle body online at Autozone, Oreilly, Advance, Amazon (Does this fit my car?) and see what you find.
 

billr

wrench
Staff member
Joined
Mar 12, 2007
Messages
7,172
Points
63
I did that a day or so ago at RA. I seems like Ford used both DBW and a separate IAC.

Oh, and since that IAC looks like it is connected with hoses, not "hard plumbed", I would be looking for a leaking hose...
 
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