High Idle Problems - Ford Powerstroke Diesel Forum
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Old 09-30-2013, 05:19 PM
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High Idle Problems

So winter is coming and I live in a cold area so my high idle is important to me. The story of how this happened: I bought the truck in September 2012 used with the high idle already installed with a knob to adjust rpm. My high idle worked every time I flipped the 4th aux. switch right up until I installed my Spartan tuner. It worked that day, installed my tuner and exhaust in the end of February, backed my truck out of the loading bay at my work and flipped the switch as usual... and nothing happened. Flipped the switch several times and still nothing. For the month of March it would work about once every 10 tries. April comes and it works maybe once every 20 tries (yes I tried a lot). May comes and it stopped working completely. So I think its a fuse and Ill get to the fuse before next winter but for the summer it doesn't matter. Junes now here and every once in a while I randomly flip the switch for sh*ts and giggles and nothing. About middle of July I'm digging through my center console while the truck is running and end up bumping my 4th aux switch up and the high idle comes on (my parking brake sensor is disconnected and has been since I bought it so all I have to do is flip up my aux switch and the high idle comes on). Now its the end of August and my dad is borrowing my truck because his has a broke front cv axle, he pulls up to my house in my truck because he forgot something and flips on the high idle and it comes on again. So now I'm not thinking its a fuse because if it was the high idle wouldn't work at all. Could the tuning have anything to do with it?? If any one has any idea of what could be the problem probably has a better guess than me because I have no clue... So any advice is appreciated. Thanks in advanced.
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Old 09-30-2013, 05:34 PM

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I would lean more towards a loose connection than tune or fuse. To make the high idle mod work there are basically 4 wires connected through the upfitter. You mention the e-brake is bypassed so that would add another couple of wires to check. Here is a link that I used for reference when hooking mine up. It will help you to find the wires, then you can double check all the connections.


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Last edited by Steveaux; 09-30-2013 at 05:42 PM.
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Old 09-30-2013, 05:48 PM
Compression Ignition Addict

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Thanks for the link. I did take a look under my dash back in June and kinda followed the wires around a bit and everything looked fine from what I saw but I didn't look too hard. I'll take another look tomorrow if the day is nice and use the diagram and check everything out
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blown fuse, high idle, spartan, tuning

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