type44? Fwd: Re: ISV

[Chris Dyer]

Again, my ignorance is playing out here. I know what the ISV is (after
numerous cleanings...) but what is the idle switch? What's its job? Where is
it? Who is it dating?

(my car is a '87 5ktq; does it even have one?)


>From: Ben Swann <bswann at worldnet.att.net>
>Reply-To: "bswann at worldnet.att.net" <bswann at worldnet.att.net>
>To: "'richard at rvanderhoff.org.uk'" <richard at rvanderhoff.org.uk>
>CC: "'quattro at audifans.com'" <quattro at audifans.com>
>Subject: Re: ISV
>Date: Thu, 11 Jul 2002 11:05:53 -0400
>
>Just adding 1 thing to what Huw says below.
>
>For type 44/5000/200 with 2 wire ISV's, if you can blow through it, it is
>bad.  Some are worse than others, but if it passes any air -> BAD.
>
>Three wire sensors do not adhere to this test.
>
>Ben
>With many too many flaky ISVs to stik a shake at!
>
> > > Did you check your ISV with a 9volt or is there another method. WHen I
> > > checked mine with a 9 volt it clicked. Is it supposed to do something
>else?
> >
> > For what it's worth, I just connected mine up in series with an ammeter
>to
> > its connector, and put it where I could see it when I turned the key on
> > and off.  I didn't have a 9V to hand ... I'd expect it to do more than
> > click though (like close or open or do something...)
>
>The ISV is driven on a "duty cycle" basis.  Some are two wire, some
>three, some are closed at rest, some partly open.
>
>In order to regulate the amount of air they allow through, the ECU sends
>a constant stream of pulses, so the ISV sort of flips open/shut rapidly
>- and makes a buzzing sound while doing it.  The width of those pulses
>determines how much it is "open" versus "shut".
>
>For this to happen two things are required: the engine must be running,
>and the idle switch must be activated.
>
>--
>Huw Powell
>
>http://www.humanspeakers.com/
>
>http://www.humanthoughts.org/
>




from chrisdyer at hotmail.com


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