Truck high idles all the time and has no power - Ford Powerstroke Diesel Forum
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Old 01-07-2010, 08:38 AM
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Truck high idles all the time and has no power

As the title says....Truck high idles all the time (in any gear also) and has no power. It goes up to 1,500 rpms and sits there. If you touch the brakes, the idle comes back down. As soon as you let off of them, it creeps back up to 1,500. If you put it in gear and let off the brakes, it will try to high idle in gear also.

Anyone see something like this at all? The truck is pretty much stock and doesn't have a programmer in it either.

Any help would be awesome.

Thanx
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Old 01-07-2010, 12:08 PM
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Well, if the truck is stock, then the higher idle means in going into regen. You have nothing to worry about, this is completely normal...

Fill out your sig so others can see what your working with...
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Old 01-07-2010, 01:04 PM
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Sorry, the truck is a 09 6.4L with about 3,800 on the clock. He is going to do a DPF delete on it. The DPF delete will get rid of this?
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Old 01-07-2010, 02:00 PM
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it should not go into hi idle unless it is cold and then only till it warms up. also if you touch the go pedel or the brake it should go back to normal idle for a little while then start to creep backup. It should not go into regen if you are parked they fixed the regen in the 08s so it only goes into regen when you are driving and stops when you put it in park I would check with the dealer if it has warrenty before you do the delete so you don't have to change it back if it is a problem
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Old 01-07-2010, 02:57 PM
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If the EGT sensors are not reading correctly will it do that? I hooked a scanner up and it is not showing 2 and 3 (well they are reading, but really low).
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Old 01-07-2010, 06:52 PM
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You have a VREF concern.

When the truck loses VREF or the accel pedal goes for a poop, it'll do this.

What codes are in the truck?
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Old 01-07-2010, 07:00 PM
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if its only got 3800 miles and is stock take it to the dealer make them fix it
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Old 01-07-2010, 08:24 PM
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The guy doesn't want to take it to the dealer.

So to find out, it is a '10 model. I thought it was a little older. Anyways, i have narrowed it down to something that is tied to the Traction Control System.... I got the power back and the high idle mostly gone.

If i turn the key on, disable the TCS and then start it, it runs perfectly. The moment i turn it back on, the high idle comes back right away. It is totally weird. The truck is on 35s with a small lift. Also, if you drive it with the TCS enabled it will limit the speed (50 mph) and try to cut the power (that's were he was talking about the loss of power). It would engage the TCS by itself and try to cut the power back so it would "get traction". Something it going on with it.
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Old 01-07-2010, 08:26 PM
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It also had some U codes. I wasn't able to find them. U0253, U0115, U0100.
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Old 01-11-2010, 03:34 PM
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I'm still gonna go with something is robbing your 5v reference. Be it in the traction control, or some other system.
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