High idle dilemma
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High idle dilemma
I have a 2001 Ford Excursion 7.3 diesel. Recently when it's cold enough the truck would high idle and after a while it would drop. and then it would come back, and then it would drop....and so forth. At one point in time while I was under the hood while it was running in low idle on a cold morning (it should have been high idle) looking for the problem I opened the fuse box lid and it decided to jump up to high idle. I closed the lid, closed the hood, came in the house. It went back down to low. A little while later it went back up to high. until I pop the driver's door open! and then it dropped! So for about a month now every time I program the keypad to unlock the door the Idle wood drop down, or if it was unlocked and I opened the driver's door the idle would immediately fall! I've been searching through this website trying to find anyone with a similar problem. not sure where to begin. I thought it might have been on one of the sensors on the front of the engine. I did a wiggle test and tried to duplicate the opening the fuse block lid and now can't get it to do anything at all, and it never idles high in the cold morning anymore please help.
Laughing Gas
Joined: Jun 2017
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From: CSRA, SC
I have a 2001 Ford Excursion 7.3 diesel. Recently when it's cold enough the truck would high idle and after a while it would drop. and then it would come back, and then it would drop....and so forth. At one point in time while I was under the hood while it was running in low idle on a cold morning (it should have been high idle) looking for the problem I opened the fuse box lid and it decided to jump up to high idle. I closed the lid, closed the hood, came in the house. It went back down to low. A little while later it went back up to high. until I pop the driver's door open! and then it dropped! So for about a month now every time I program the keypad to unlock the door the Idle wood drop down, or if it was unlocked and I opened the driver's door the idle would immediately fall! I've been searching through this website trying to find anyone with a similar problem. not sure where to begin. I thought it might have been on one of the sensors on the front of the engine. I did a wiggle test and tried to duplicate the opening the fuse block lid and now can't get it to do anything at all, and it never idles high in the cold morning anymore please help.
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One or the other
Okay the only thing I've discovered so far is, recently a new development is that a dome lights stayed on will not go off, I attribute that to possibly a short in the driver door latch switch. When it's not acting up, the dome light switch on the dash works on and off like normal. I pulled the fuse to prevent the dome lights from coming on overnight draining my battery. That little problem is solved for the time being. As far as the high idle issue, I went around and found several ground wires under the hood, taking them apart cleaning the grounds, reattached them. Clean the battery cables. Now the idle goes to high like it used to originally and everything is happy. I don't know if the cleaning the grounds fixed it or pulling the fuse to the dome lights fixed it.
Cargo Master
Joined: Nov 2017
Posts: 3,096
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From: Rock Hill, SC
It's in the shop manual somewhere, I found it when working on various sensors, I've been looking for it to post the written description. The 7.3 will high idle, as you know, if ambient temps are below a certain point, I think it ties in with the EBV function too. It will cancel and return to normal idle when the brake pedal is pressed in expectation of you shifting into a gear, if you're not intending to drive and you hit the brake pedal, but leave it be, it will reduce the idle, then return to high idle if the need still exists.
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Apparently corrosion on the negative battery cable was the whole problem all along. put the dome light fuse back in everything's back to normal. This is my first diesel truck, first turbocharged truck, first truck with two batteries, first learning curve ... ... Failed!!
sorry I've wasted everybody's time on something so simple.
sorry I've wasted everybody's time on something so simple.
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don't worry your not wasting anyone's time we are here to help can't learn if you don't ask questions
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Cargo Master
Joined: Nov 2017
Posts: 3,096
Likes: 534
From: Rock Hill, SC
Apparently corrosion on the negative battery cable was the whole problem all along. put the dome light fuse back in everything's back to normal. This is my first diesel truck, first turbocharged truck, first truck with two batteries, first learning curve ... ... Failed!!
sorry I've wasted everybody's time on something so simple.
sorry I've wasted everybody's time on something so simple.
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