High idle won't work
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Joined: Apr 2016
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High idle won't work
I have a 99 f350 and I can't get my truck to kick up the idle when it's cold out. There have been mornings in the negatives and still nothing. I replaced my egr tube and cleaned the exhaust pressure sensor. My exhaust back pressure valve opens and shuts while driving at slow speeds but not while at idle, but I don't know if that's related. I replaced the oil temp sensor with a ford motorcraft one. And I plugged my intake air temperature sensor into a buddy's truck with the same motor and his truck still idled up no problem. I'm stumped now, any ideas what's wrong?
Elder User
Joined: May 2015
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I don't have the solution to your problem, but I want to follow along because I'm having the same issue. Albeit, mine is a '97 Powerstroke with an auto, but the issue is the same. No high idle regardless of ambient temperature.
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Yes I cleaned the exhaust pressure sensor. The exhaust valve is shutting but only after I give it some throttle. I don't know how to tell if it's good or not other than that. I do actually have some oil in my valley but didn't think much of it I thought it could have been left over from when I did my Ipr valve. Does my exhaust valve operation have anything to do with the high idle?
Butt-Head
Joined: Apr 2004
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From: Reed Point, MT
Because the 95-97 trucks do not have the software capability to "idle up" when cold.
Butt-Head
Joined: Apr 2004
Posts: 9,429
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From: Reed Point, MT
Yes I cleaned the exhaust pressure sensor. The exhaust valve is shutting but only after I give it some throttle. I don't know how to tell if it's good or not other than that. I do actually have some oil in my valley but didn't think much of it I thought it could have been left over from when I did my Ipr valve. Does my exhaust valve operation have anything to do with the high idle?
Manual or automatic transmission?
What is the PCM code? Some do not have the feature built into the calibration.
Elder User
Joined: May 2015
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However, on my dad's '97, he had one of these that was used to control the RPM and set the high idle manually.
Perhaps I need to find one secondhand and install it.
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I have a 95 that idles up no problem by itself
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New User
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It's an auto, I don't know what the pcm code is right now. But the high idle worked no problem last winter
FTE Leadership Emeritus
Joined: May 2001
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From: Cabot, Arkansas
Does the light on the dash come on when you engage the parking brake? If not it's most likely that switch.
Lead Driver
Joined: Mar 2004
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From: Northern Indiana
Yes I cleaned the exhaust pressure sensor. The exhaust valve is shutting but only after I give it some throttle. I don't know how to tell if it's good or not other than that. I do actually have some oil in my valley but didn't think much of it I thought it could have been left over from when I did my Ipr valve. Does my exhaust valve operation have anything to do with the high idle?
