Truck high idles when warm already in park - Ford Powerstroke Diesel Forum
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Old 08-06-2013, 07:14 AM
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Truck high idles when warm already in park

Ok so I have a mini max with the dpf present. Seems like sometimes after driving hard or even casual it goes to a high idle once put in park. The break will bring it down; once let off it goes back up. I know some trucks try to cool down by this but mine is not running hot nor is the fan engaged? What could this be? Its hard to tell if its the mini max since I put it on a few weeks after buying the truck. It kind of trys to do it in drive every now in then.

Anyone ever have this issue?
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Old 08-06-2013, 03:23 PM
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Ya my truck would do that if I stopped driving while a regen was going on.

My bet is that your truck is in the middle of a regen cycle.

What are your egt's when it does this?


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Old 08-08-2013, 10:59 AM
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I always stop it before but it goes 6 or 700.
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Old 08-08-2013, 11:56 AM
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Before I modded mine it did the safe thing during regen. Are you using an additive? I noticed it didn't regen as often with some diesel clean grey bottle. But this is just my 2 cents.
The additives do work. There was a thread awhile back that had them broken down by benefit or worthless. Stanadyne performance formula is the same as what you can buy from the dealer tested out to be the best.
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Old 08-08-2013, 02:44 PM
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Well I'm deleting the dpf tomorrow and yes I run additive every couple fill ups .
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Old 08-08-2013, 03:21 PM
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My truck does the same thing. 08 f350 with spartan tuner
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Old 08-12-2013, 03:41 AM
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When i bought my mini maxx i ran it for 2 weeks with DPF present tunes before i got my exhaust. Mine did the same thing! Would go into high idle even at full operating temp. Then when I re-tuned my truck for the DPF delete it stopped doing it. I would bet money its the mini maxx thats making your truck do that. because mine didnt do it till the minute I installed the tune. maybe try re-downloading the tune?? Or try the forum on H&S's website.
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Old 08-12-2013, 04:18 AM
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DPF delete put on Saturday. Towed heavy and ran hard this weekend never did it. Normally would almost be a daily thing. Thanks guys.
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