High Idle
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Mountain Pass
Joined: May 2004
Posts: 201
Likes: 1
From: El Paso, TX
Here is an update on my high idle: when I first start the truck it idles at between 700 and 800 rpm. When I put it in park after driving it a little bit, it will idle at about 1000 rpm. What else could be wrong? Could the new idle air control valve be a deffective part? Thank you all for your help.
Elder User
Joined: Mar 2004
Posts: 537
Likes: 2
From: Alabama
Any new part could possibly be defective. One of the guys I work with says "new" stands for - never ever worked. That's a little tongue in cheek however. Haynes puts out a manual on emissions systems that tells you how to check a lot of components involved with the emissions controls. I think that the first step for you though would be to buy, beg, borrow a DVOM (Digital Volt Ohm Meter) so that you can check the components. I will check when I get home and advise, but I think the ohms reading on the IAC should check out at around 75 ohms. There is a Lo/High range that if it falls between it should be good. You have to get a meter first though. A decent DVOM probably cost what one of these parts cost, approx. $30. Advance Auto has that Haynes manual on emissions controls for about $16.
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Mountain Pass
Joined: May 2004
Posts: 201
Likes: 1
From: El Paso, TX
I don't have any more pics just yet. It was not at all difficult to install it: about 6 hours on a saturday between me and my dad. I am even going to put a 3" body lift on it tomorrow. I will probably add those pics when it is done.
Elder User
Joined: Mar 2004
Posts: 537
Likes: 2
From: Alabama
O.K. it wasn't 75 ohms it's 7 - 13 ohms.
Test with the ignition key off.
Unplug the IAC and read with the DVOM set to ohms. Set it on 200 ohms. That's the lowest ohms setting on the one I have.
Technically it says to read with the positive lead on the VPWR pin and the negative lead on the ISC pin, but when I read mine it read the same either way, mainly because I couldn't really tell which pin was which. I checked the 13 yr. old one I took off thinking it was bad and the brand new one I bought to replace with and they both checked at 9.9 ohms. I replaced it anyway because I already had the new one in hand. So I would say that if you can get a DVOM and the IAC checks somewhere between 7 - 13 ohms that' s probably not the problem. This info is in the better Chilton manual that covers 1987 - 1996 Pickups and Broncos in the emissions chapter.
Test with the ignition key off.
Unplug the IAC and read with the DVOM set to ohms. Set it on 200 ohms. That's the lowest ohms setting on the one I have.
Technically it says to read with the positive lead on the VPWR pin and the negative lead on the ISC pin, but when I read mine it read the same either way, mainly because I couldn't really tell which pin was which. I checked the 13 yr. old one I took off thinking it was bad and the brand new one I bought to replace with and they both checked at 9.9 ohms. I replaced it anyway because I already had the new one in hand. So I would say that if you can get a DVOM and the IAC checks somewhere between 7 - 13 ohms that' s probably not the problem. This info is in the better Chilton manual that covers 1987 - 1996 Pickups and Broncos in the emissions chapter.
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