ford efi snafu'd

[Programmer]

Joe,

Couple things that causes this--lower plenum gasket likes to leak (real
common problem), and the EGR position sensor (faulty) can cause a high idle.
There's been updated EGR position sensors...so be carefull which one's you
pull at a junk yard. Uncontrolled idle in any EFI is always usually a vacuum
leak.

Lyndon.
----- Original Message -----
From: "Joe Piche" <joepiche at hotmail.com>
To: <diy_efi at diy-efi.org>
Sent: Friday, August 31, 2001 6:24 PM
Subject: ford efi snafu'd


> I've asked around, and poked around, but haven't been able to find the
> solution to this problem.
>
> I've got an 87 f150, 302, efi (eec iv). The truck runs ok, except for:
>
> Its got a high idle. 1500 rpm.
> It will drop to 1000 or so, and then come up to 1500 rpm (this cycles at
> stop lights). Annoying to say the least.
> No check engine light.
>
> What I've done
> Vacuum check. 20 inchs at idle.
> It does this with the idle air controller unplugged.
> Replaced the idle air controller. It was buggered anyways.
> Removed most of the vacuum emmissions stuff that wasn't hooked up anyways
> (no cats) from the airpump. air     pump has had the guts pulled out of
it.
> Replaced the Air intake temp sensor because the problem went away when I
> unplugged it. (Only to return after I ordered the part (not installed it))
> Replaced the throttle position sensor.
> The o2 sensor is less than a year old.
>
> Probably will get a water temp sensor & map out of the junkyard, and try
> that next.
>
> Running out of ideas here..
>
> Thanks, Joe
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