I have a bad computer in my horizon, it does the same thing.
A bad vaccum leak can do the same, also check your tb for binding, next time
it happens open the hood and try to push the throttle to the closed
position.
Mark Kuzia
flyboy01@mediaone.net
http://people.mw.mediaone.net/flyboy01/home.html
1995 Dakota 13.79 @ 102.45 mph
360ci, 5-spd, 4.11 LS(blown out), Cowl-induction
(A new 8 3/4 is being built by Reider Racing right now)
----- Original Message -----
From: <DICEMAN469@aol.com>
To: <dakota-truck@buffnet.net>
Sent: Monday, November 20, 2000 8:25 AM
Subject: DML: Erratic idle after WOT
> I thought I'd be able to fix the problem myself, but this is the last kink
I
> have to overcome to have a 100% working engine. I searched the archives
but
> can't find any problems EXACTLY like this, so here goes.
> Truck runs perfect under ALL circumstances. No stumbling, no strange
> idling, no stalling, no engine codes. Everything is kosher until I push
the
> pedal to the floor. Truck goes like stink, but when I let off the
throttle,
> the idle hovers around 2.2K pretty much permanently. You can rev the
engine,
> continue to drive, switch the tranny into another gear, but it will
continue
> to idle at that speed. It's very annoying to sit at a light and have the
idle
> revving at 1300 rpm with the truck in gear! Now sometimes if you give it a
> good 1 second wail on the throttle and then let go, the idle will come
back
> down to normal (it won't work with anything less than WOT though). Now if
I
> shut the truck off and restart it, it will return back to normal, with no
> engine codes. Now this is what I've tried so far:
> I've replaced the IAS, TPS, and the MAP sensor, to no avail. I took
off
> the throttle body, and completely cleaned the unit, making sure the MAP
> vacuum port wasn't clogged. I also cleaned the IAS plunger and port. I
> checked the wiring, and verified that the throttle cable isn't sticking. I
> tried adjusting the throttle blade angle, and that didn't work. It does
this
> with or without the supercharger, and I've even tried swapping ECUs....all
to
> no avail.
> I can't think of anything else. The only thing it could be is the
> throttle body itself. I find that hard to believe though, after all the
TB's
> just a hunk of metal with really no movable parts to fail other than the
> throttle blades, and those have no play in them. The only spare TB I got
is
> the V6's, and I've thought about throwing it in temporarily to see what
> happens, but with smaller bores it will increase the vacuum, which defeats
> the purpose of a direct swap. I've checked for vacuum leaks, which I can't
> find. Even when I had a vacuum leak in the past, it never acted like this.
> So, what the hell else can it be?!?
>
> -Austin
> Vipertruck
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