Idle Air Control valve

97 GT mustang 63k trouble code P1443 (Evap Emission Control system
control valve) from Autozone scanner. Book says Idle air control
valve speed fault. Check engine light came on just as i finished
filling tank. but it had come on 3 weeks earlier on a hot day (code
was mistakingly erased). what do suspect is the problem? where is
the valve? DIY? thanks for any help. bill

In article >, bill wrote:
> 97 GT mustang 63k trouble code P1443 (Evap Emission Control system
> control valve) from Autozone scanner. Book says Idle air control
> valve speed fault. Check engine light came on just as i finished
> filling tank. but it had come on 3 weeks earlier on a hot day (code
> was mistakingly erased). what do suspect is the problem? where is
> the valve? DIY? thanks for any help. bill

autozone is full of crap. evap control valve is small solinoid valve
tucked into the corner of the engine compartment on the passenger side
near the windshield. The part cost me ~$10 from a motorcraft distributor.

If the code persists, just replace it. It can be cleaned to squeeze more
life from it, but when I decided to just replace it I wondered why I had
bothered. (I also had code 1443 as I recall for that)

The idle air control valve is something entirely different and controls
engine idle speed. You'll know when it's bad or needs cleaning when the
engine won't idle unless you depress the gas pedal. This doesn't usually
throw a code. At least it didn't in my case. I just cleaned it with
throttle body cleaner and all was good.

(Brent P) wrote:


>
> The idle air control valve is something entirely different and
> controls engine idle speed. You'll know when it's bad or needs
> cleaning when the engine won't idle unless you depress the gas pedal.
> This doesn't usually throw a code. At least it didn't in my case. I
> just cleaned it with throttle body cleaner and all was good.

ISC/IAC valve may cause various idle problems.

Symptom is it gets sticky and may cause hard cold or hot start or idle too
high, too low, adjust idle too slow.. etc.

Most find that cleaning it only puts off the problem a while OR it changes
the symptoms, - like from stalling to too high rpm.

That IS a good indicator, however, you need a new one. Another indicator
of the failure prone nature of these is the cost and availability....
everyone carries 'em and they're relatively cheap.

--
Yeh, I'm a Krusty old Geezer, putting up with my 'smartass' is the price
you pay..DEAL with it!

this am , the light went out. i thought check eng light stays on
until someone resets it. what gives?


On Fri, 11 Aug 2006 12:04:05 -0400, bill > wrote:

>97 GT mustang 63k trouble code P1443 (Evap Emission Control system
>control valve) from Autozone scanner. Book says Idle air control
>valve speed fault. Check engine light came on just as i finished
>filling tank. but it had come on 3 weeks earlier on a hot day (code
>was mistakingly erased). what do suspect is the problem? where is
>the valve? DIY? thanks for any help. bill

In article >, bill wrote:
> this am , the light went out. i thought check eng light stays on
> until someone resets it. what gives?

No, what happens is if the car goes through a 'driving cycle' and the
problem did not re-occur, the MIL is commanded off.

evap purge can be like that. Basically the solinoid is sticking. It got
unstuck.

Backyard Mechanic wrote:
> (Brent P) wrote:
>
>
>> The idle air control valve is something entirely different and
>> controls engine idle speed. You'll know when it's bad or needs
>> cleaning when the engine won't idle unless you depress the gas pedal.
>> This doesn't usually throw a code. At least it didn't in my case. I
>> just cleaned it with throttle body cleaner and all was good.
>
> ISC/IAC valve may cause various idle problems.
>
> Symptom is it gets sticky and may cause hard cold or hot start or idle too
> high, too low, adjust idle too slow.. etc.
>
> Most find that cleaning it only puts off the problem a while OR it changes
> the symptoms, - like from stalling to too high rpm.
>
> That IS a good indicator, however, you need a new one. Another indicator
> of the failure prone nature of these is the cost and availability....
> everyone carries 'em and they're relatively cheap.
>

Buying a cheapass POC from AutoZone has the same effect as cleaning.

--

I used to have abs. Now, I've just got ab.
One big ol' Ab. - BigSkiff www.titanspot.com

Pyongyang sounds more like the sound effect an ACME catapult makes
as it goes off at precisely the wrong moment for Wile E. Coyote. -
Cadbury Moose