Won't idle high at cold start up - Ford Powerstroke Diesel Forum
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Old 08-30-2012, 10:47 PM
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Won't idle high at cold start up

I have an '02 f-250 with 7.3 and a 5 speed. When I start the truck to warm up it won't go into the high idle mode. I have replaced the clutch interlock switch or neutral safety switch (whatever it's called) and now cruise control works so I know that's good. Also the brake turns cruise off so that switch is good too. Any other ideas?
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Old 08-31-2012, 04:47 PM
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I believe it has to be in the 40s maybe colder for that to work


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Old 09-12-2012, 02:24 PM
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the parking brake also has to be on. if the brake light in the dash is not on even with the parking brake set it will not idle up. i have to wiggle the button that turns on the light sometimes to get my light to come on. letting the pedal slam up when you release it is hard on it and will cause that button to go bad
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Old 09-12-2012, 04:19 PM
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I didn't know that the ebrake had to be on. My parking brake has never been on and the light didn't work but it idles up to about 900-1000. Should it go higher than that?


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Old 09-12-2012, 06:15 PM
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it has to be in park for it to go into high idle.
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Old 09-13-2012, 06:27 AM
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Quote:
Originally Posted by packyoc View Post
I have an '02 f-250 with 7.3 and a 5 speed. When I start the truck to warm up it won't go into the high idle mode. I have replaced the clutch interlock switch or neutral safety switch (whatever it's called) and now cruise control works so I know that's good. Also the brake turns cruise off so that switch is good too. Any other ideas?
It has to be cooler than something like 40*, the parking brake has to be on, and you have to be sitting still w/out touchign the pedals for something like 7 minutes or 10 minutes. the high idle isn't nearly as high as a high-idle chip would say.
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Old 09-13-2012, 05:16 PM
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it has to be in park for automatics, parking brake has to be on in standards trans trucks
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