'94 Escort idle problems - Ford Forums - Mustang Forum, Ford Trucks, Ford Focus and Ford Cars
 
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post #1 of 3 (permalink) Old 09-06-05, 10:01 AM
dallison.remove@mindspring.com
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'94 Escort idle problems

I have a 1994 Escort 1.9L with 142,000 miles. When the engine is cold,
the idle "hunts" up and down. When it's warm, it's steady. However,
when I decelerate and come to a stop (clutch in or in neutral), it
hunts again 5 or 6 times before smoothing out. When the a/c is on, it
dies on deceleration.

I suspect the idle air control valve. When I unplug the electrical
connection to the valve with the engine warm, the hunting stops though
the idle is a bit rough. If I unplug the valve with the engine cold,
it dies.

I know the valve is responding to the computer which is using info
from various sensors. Before I change the valve, I wanted to see if it
might be one of the sensors.

I changed the oxygen sensor but that made no difference.

There are no stored fault codes.

Any ideas? Thanks!

Doug





 
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post #2 of 3 (permalink) Old 09-06-05, 11:01 AM
Sharon K.Cooke
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Re: '94 Escort idle problems

dallison.remove@mindspring.com wrote:
>
> I have a 1994 Escort 1.9L with 142,000 miles. When the engine is cold,
> the idle "hunts" up and down. When it's warm, it's steady. However,
> when I decelerate and come to a stop (clutch in or in neutral), it
> hunts again 5 or 6 times before smoothing out. When the a/c is on, it
> dies on deceleration.
>
> I suspect the idle air control valve. When I unplug the electrical
> connection to the valve with the engine warm, the hunting stops though
> the idle is a bit rough. If I unplug the valve with the engine cold,
> it dies.
>
> I know the valve is responding to the computer which is using info
> from various sensors. Before I change the valve, I wanted to see if it
> might be one of the sensors.
>
> I changed the oxygen sensor but that made no difference.
>
> There are no stored fault codes.
>
> Any ideas? Thanks!
>
> Doug


The IACV is almost 12 years old; get a new one. If the IACV on your Escort is
like most Ford products, its primary input is from the Throttle Position Sensor
(TPS). A bad TPS will throw a code, so it's probably just a worn IACV.
 
post #3 of 3 (permalink) Old 09-08-05, 07:01 AM
dmtaurus
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Posts: n/a
Re: '94 Escort idle problems

Try cleaning it. Take it off and use a carb cleaner to spray in the underside
ports. This frees it up and allows the valve to seat and to open I had the same,
exact problem on my 94 Escort and that fixed the problem and saved a bunch of
moola.

"Sharon K.Cooke" wrote:

> dallison.remove@mindspring.com wrote:
> >
> > I have a 1994 Escort 1.9L with 142,000 miles. When the engine is cold,
> > the idle "hunts" up and down. When it's warm, it's steady. However,
> > when I decelerate and come to a stop (clutch in or in neutral), it
> > hunts again 5 or 6 times before smoothing out. When the a/c is on, it
> > dies on deceleration.
> >
> > I suspect the idle air control valve. When I unplug the electrical
> > connection to the valve with the engine warm, the hunting stops though
> > the idle is a bit rough. If I unplug the valve with the engine cold,
> > it dies.
> >
> > I know the valve is responding to the computer which is using info
> > from various sensors. Before I change the valve, I wanted to see if it
> > might be one of the sensors.
> >
> > I changed the oxygen sensor but that made no difference.
> >
> > There are no stored fault codes.
> >
> > Any ideas? Thanks!
> >
> > Doug

>
> The IACV is almost 12 years old; get a new one. If the IACV on your Escort is
> like most Ford products, its primary input is from the Throttle Position Sensor
> (TPS). A bad TPS will throw a code, so it's probably just a worn IACV.


 
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