Wits End!!
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Joined: Aug 2012
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Wits End!!
I have a 2000 Ford F250 Super Duty, 6.8L V10 Manual tranny. Problem is when you push the clutch in the engine idles extremely high at 1500 to 1800 rpms and settles down to 1000 rpm only after you come to a stop. This seems to happen less when the engine is cold. (Any transmission disengagement the engine idles high). (Have good clutch disengagement). Replaced MAF sensor w/air intake, IAC valve, TP sensor, all oxygen sensors, all spark plugs, all filters, and fuel pressure regulator, entire EGR system, throttle body in good working order. Checked engine vacuum and at idle it is 17 Hg/steady needle. No check engine lights are on. Driving down the road the truck runs great. Take it out of gear and the nightmare begins. Any ideas? Would appreciate it.
Cargo Master
Joined: Sep 2007
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From: OR and UT
Senior User
Joined: Mar 2008
Posts: 342
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From: Maple Ridge, Canada
Disconnecting the battery, as when you change out engine components, means the adaptive fuel strategy will need to relearn and fine tune its function. This could cause a unstable idle until the ECM gets things settled.
The ''Ford drive cycle'' is a procedure to go through to reset all the emission monitors after the battery reconnect.
And also
My truck will idle higher after letting it lug in gear at idle, like when in bumper to bumper rush hour trafffic. the ECM adapts the fuel level to keep the engine at idle RPM. When the clutch is depressed[load removed] the revs rise up to 1200+- until the fuel trims readjust to idle at the correct RPM.
The ''Ford drive cycle'' is a procedure to go through to reset all the emission monitors after the battery reconnect.
And also
My truck will idle higher after letting it lug in gear at idle, like when in bumper to bumper rush hour trafffic. the ECM adapts the fuel level to keep the engine at idle RPM. When the clutch is depressed[load removed] the revs rise up to 1200+- until the fuel trims readjust to idle at the correct RPM.
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