Why won't it idle up? - Ford Powerstroke Diesel Forum
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Old 01-14-2009, 05:53 PM
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Why won't it idle up?

Okay, after doing some reading, I just noticed about a month ago that my truck hasn't been idling itself up when it's cold. Some people say that the parking brake has to be set (my truck's an auto) but I've never set the parking brake before and it used to idle up. I've tried setting the parking brake but that did no good. Then I noticed that the parking brake light on the dash wasn't working. So a couple days ago, I beat on the dash and got the light to start working again. Tonight, I started my truck and let it run for 20 minutes with the parking brake on and the light was working. It's about 15 degrees here right now and it still didn't idle up. Anyone have any idea what's wrong?

*Edit* I even turned my Dp tuner back on the stock setting, thinking that maybe my other settings might have the high idle turned off
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Old 01-14-2009, 05:59 PM
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dang thats weird mine still idles up with my DP

heres anever heard of what causes it not to work
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Old 01-14-2009, 06:02 PM
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Quote:
Originally Posted by bigwhite7.3stroker View Post
dang thats weird mine still idles up with my DP

heres anever heard of what causes it not to work
It's got me stumped. Like I said, I've never set my parking brake before and it used to do it
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Old 01-14-2009, 06:03 PM
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Well, it bases high idle on the air temp sensor and oil temp sensor, maybe one of those 2 are bad.
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Old 01-14-2009, 06:04 PM
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Quote:
Originally Posted by cob32187 View Post
Well, it bases high idle on the air temp sensor and oil temp sensor, maybe one of those 2 are bad.
How would one go about checking those?
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Old 01-14-2009, 06:06 PM
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Quote:
Originally Posted by cob32187 View Post
Well, it bases high idle on the air temp sensor and oil temp sensor, maybe one of those 2 are bad.
hmmm... that makes sense sounds like this should be a pretty easy fix

whitelongbed I never set my parking brake either and mine always works
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Old 01-14-2009, 06:07 PM
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Quote:
Originally Posted by whitelongbed View Post
How would one go about checking those?
I don't know. Ask it if it's feelin ok?




I don't know for sure, but probably a good scanner would pick it up if it aint readin right. Especially one of the hi tech ones that shows exactly the voltage that each sensor is reading, then compare that voltage to the actual temp.
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Old 01-14-2009, 06:09 PM
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it wont do it if your truck is already warm. have you been plugging it in? mine dont idle high when its been plugged in or when its already warm.
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Old 01-14-2009, 06:11 PM
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Originally Posted by cob32187 View Post
I don't know. Ask it if it's feelin ok?
BRB........

I guess I'll have to try and get it scanned. It's not a big deal, just one of those things that makes me wonder
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  #10  
Old 01-14-2009, 06:11 PM
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Originally Posted by jamstoyz View Post
it wont do it if your truck is already warm. have you been plugging it in? mine dont idle high when its been plugged in or when its already warm.
It's been sitting since Monday afternoon, not plugged in.
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