AIH Delete Question

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Dec 26, 2012 | 09:11 AM

bly8397

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Joined: Nov 2012

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From: Knoxville, TN

AIH Delete Question

What did you do with the AIH Relay after completing this mod?

Dec 26, 2012 | 09:15 AM

mueckster

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From: Damon (South East Texas)

I removed the ground and power supply to the element and left the relay in place. It can be used for a spare GPR, if needed.

Dec 26, 2012 | 09:29 AM

Kdr358

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From: West of Chicago

I also did the same thing and left the relay alone.

Dec 26, 2012 | 10:15 AM

Superduty ROCKS

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From: Kentucky

x3. Worked for me too.

Dec 26, 2012 | 06:15 PM

lhud

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From: Chattanooga, TN

Ditto for me.
Roland, is there any issues with leaving the electrical connections on the relay?
Only thing I see is it will cause the relay to pull in when the conditions warrant it.

Dec 26, 2012 | 06:59 PM

TXdoug

Tuned

Joined: Oct 2012

Posts: 352

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From: San Antonio, TX

Here is what I did today. My delete plug is still in the mail.
https://www.ford-trucks.com/forums/1...-question.html

Dec 26, 2012 | 07:49 PM

jccapri

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From: garland tx

Does the iah help on start up when its in the 20

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Dec 26, 2012 | 11:48 PM

binuya

Fleet Mechanic

Joined: Nov 2008

Posts: 1,573

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From: Seattle

Quote:

Originally Posted by jccapri

Does the iah help on start up when its in the 20

The AIH does not aid cold starting. It's one and only purpose is to reduce white smoke during extended idling periods in cold weather.

Dec 27, 2012 | 09:21 AM

#10

Shake-N-Bake

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Joined: Sep 2003

Posts: 6,096

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From: Mesa AZ

Quote:

Originally Posted by jccapri

Does the iah help on start up when its in the 20

Not on 7.3 models.
As far as I know, the AIH assists with cold starts on the 4.5 liter Power Stroke models only.

Dec 27, 2012 | 09:38 AM

#11

mueckster

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Joined: Jun 2003

Posts: 8,298

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From: Damon (South East Texas)

Quote:

Originally Posted by lhud

Ditto for me.
Roland, is there any issues with leaving the electrical connections on the relay?
Only thing I see is it will cause the relay to pull in when the conditions warrant it.

No. As long as the wiring going to the AIH is removed, you're good. You will get a soft code, without the AIH load, but can be remedied with a 470 ohm (1/2 watt or greater) resistor run from the relay "out" to ground. The resistor acts as a load for the relay and fools the PCM in thinking that the AIH is still coonected.

Dec 27, 2012 | 09:53 AM

#12

bly8397

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Joined: Nov 2012

Posts: 101

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From: Knoxville, TN

I was thinking about removing the relay completely. I'm a minimalistic kind of guy. But after reading this, I think I'll just keep it as a spare, or just remove it... Crap! I guess I'm still undecided.