ISV

[Huw Powell]

take a look at the throttle butterflies, maybe they are sticking. 
that's about the only way to get 4000 rpm without touching the gas
pedal.  the reason it crashes back down is the idle switch is still
closed so the ecu cuts off the fuel when it "soars"... fun

"Mark E. Johnson" wrote:
> 
> Hello again -
> 
> The idle on my 86 4kq has now gone seriously awry. When started it will
> bounce between 1500 and 1800 RPM, then soars to above 4000 RPM. If I poke
> the throttle when it's at 4000+, it will dive back down and bounce between
> 1500 and 1800 for 4-8 seconds, then soar up again.
> 
> I pulled the ISV and cleaned it, but it had no effect. Time to replace it or
> is there something else to try? Any idea on the cost of the ICV? If it's
> very high, is it worth trying a junk yard?
> 
> Thanks.
> 
> -mej
> 
> Mark E. Johnson /
>                / Photojournalist
> 
> Medway, Massachusetts
> 
> Office: 508-533-1562
> Email: mej at mejphoto                     Images available through:
> http://www.mejphoto.com                http://www.picturedesk.org

-- 
Huw Powell

http://www.humanspeakers.com

http://www.humanthoughts.org