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Old 06-14-2005, 00:04   #1 (permalink)
chum
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1990 Escort weird idling and stalling problem...please help!

After the engine gets warm and in park...the engine will stall then
surge back to idle speed about once every 10 seconds. If your sitting
in drive with your foot on the brake...it does not occur. While
driving, the car will run fine under load, but if you are coasting it
will stall and completely lose power until you pop it into neutral for
a second...then it starts running again... :roll:

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Old 06-14-2005, 00:04   #2 (permalink)
scott_z500@my-deja.com
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Re: 1990 Escort weird idling and stalling problem...please help!

How many miles are on the car?

Have you checked for vacuum leaks?

Have you checked for codes?

Does this car have a MAF sensor or throddle body that needs to be
cleaned?

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Old 06-14-2005, 00:04   #3 (permalink)
sleepdog@optonline.net
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Re: 1990 Escort weird idling and stalling problem...please help!

This car has a vane metering system (VAT/VAF), but the problem sounds
like the idle air control valve, since it only happens when the
throttle is at idle.

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Old 06-14-2005, 00:05   #4 (permalink)
chum
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Re: Re: 1990 Escort weird idling and stalling problem...please h

"sleepdog" wrote:
> This car has a vane metering system (VAT/VAF), but the problem
> sounds
> like the idle air control valve, since it only happens when
> the
> throttle is at idle.


It has 95,000 miles on it...it does not have an idle air control valve
(CFI 1.9 L). I have checked for vacuum leaks...

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Old 06-14-2005, 00:05   #5 (permalink)
sleepdog@optonline.net
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Re: 1990 Escort weird idling and stalling problem...please h

My bad, assumed it was MFI like my old Escort. For CFI check the idle
control motor.

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Old 06-14-2005, 00:05   #6 (permalink)
chum
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Re: Re: 1990 Escort weird idling and stalling problem...please h

"sleepdog" wrote:
>My bad, assumed it was MFI like my old Escort. For CFI check the

idle
>control motor.


You know...you may be onto something there...I have watched that
thing and I never see it move...

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Old 06-14-2005, 00:05   #7 (permalink)
Tom Adkins
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Re: 1990 Escort weird idling and stalling problem...please h

chum wrote:
> "sleepdog" wrote:
>
>>My bad, assumed it was MFI like my old Escort. For CFI check the

>
> idle
>
>>control motor.

>
>
> You know...you may be onto something there...I have watched that
> thing and I never see it move...
>


1990 seems a bit late for CFI? You sure??
The CFI's used an "Idle Tracking Motor". One common failure was the "nose switch" in
the tracking motor asy. that sensed when the throttle was closed. I don't remember the
symptoms, but if the nose switch was bad it caused an bad idle concern. The motors
used to fail on a regular basis also. I remember a few CFI cars with shorted?(full
hot) coolant temp sensors that mimiced tracking motor concerns. (No or low idle until
the CTS was unplugged).
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Old 06-14-2005, 00:05   #8 (permalink)
sleepdog@optonline.net
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Re: 1990 Escort weird idling and stalling problem...please h

The CFIs were made up until the 1990 model year, you could get them in
the AT LX and Pony trims. 1990 was the last year for the 1st gen
Escort, 1991 and forward were the 2nd gen Mazdas that I think were
always MFI.

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Old 06-14-2005, 00:06   #9 (permalink)
chum
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Re: Re: 1990 Escort weird idling and stalling problem...please h

"Tom Adkins" wrote:
> chum wrote:
> > "sleepdog" wrote:
> >

>  >>My bad, assumed it was MFI like my old Escort. For
> CFI check the
> >
> > idle
> >

>  >>control motor.
> >
> >
> > You know...you may be onto something there...I have watched

> that
> > thing and I never see it move...
> >

>
> 1990 seems a bit late for CFI? You sure??
> The CFI's used an "Idle Tracking Motor". One common failure
> was the "nose switch" in
> the tracking motor asy. that sensed when the throttle was
> closed. I don't remember the
> symptoms, but if the nose switch was bad it caused an bad idle
> concern. The motors
> used to fail on a regular basis also. I remember a few CFI
> cars with shorted?(full
> hot) coolant temp sensors that mimiced tracking motor
> concerns. (No or low idle until
> the CTS was unplugged).


If CFI means "central fuel injection" then thatís what it has...one
injector that sprays into a throttle body.

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Old 06-14-2005, 00:06   #10 (permalink)
chum
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Re: Re: 1990 Escort weird idling and stalling problem...please h

"Tom Adkins" wrote:
>chum wrote:
>> "sleepdog" wrote:
>>
>>>My bad, assumed it was MFI like my old Escort. For CFI check the

>>
>> idle
>>
>>>control motor.

>>
>>
>> You know...you may be onto something there...I have watched that
>> thing and I never see it move...
>>

>
> 1990 seems a bit late for CFI? You sure??
>The CFIís used an "Idle Tracking Motor". One common failure was
>the "nose switch" in
>the tracking motor asy. that sensed when the throttle was closed. I
>donít remember the
>symptoms, but if the nose switch was bad it caused an bad idle
>concern. The motors
>used to fail on a regular basis also. I remember a few CFI cars with
>shorted?(full
>hot) coolant temp sensors that mimiced tracking motor concerns. (No

or
>low idle until
>the CTS was unplugged).


Does the temp guage on the dash have anything to do with "coolant
temp sensor" If it was shorted wouldnít I have the symptom
constantly...it does not happen when the engine is first started...it
has to run for about 10 minutes before the problem starts...

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