warm idle 1500 rpms wont go down.

[jondee86]

To check if the Auxiliary Air Valve (AAV) is causing the problem by
staying open after the engine warms up, do this:

- Take off the intake air ducting from the front of the throttle body.
- With the engine running and warmed up, block the AAV air port with
your finger. It is the large hole at the bottom of the throttle body, just
in front of the butterfly.
- The idle speed drops by about 100 rpm, the valve is closed.
- If the idle speed drops by 500, 600 or more rpm, then the valve is
not closing, and must be repaired or replaced.

In general repairing is limited to cleaning the valve if it is jammed open
with corrosion or rubbish from the cooling system. If this does not help,
get a new valve. It is a wax filled thermostat, and after 20 years or so
they get a bit tired

Cheers... jondee86