Folks,

I have been troubleshooting high idle speed (~1200 warn engine) on an '88
300TE. I repaired the rubber hoses to and from the idle speed motor (may not
be proper name) and a number of vacuum lines, then I checked the engine
codes since "check engine" light is on and found code #5. Also, when engine
is warm if I unplug the idle speed motor, RPMs drop to 750.

My questions are:

-  what signals the idle motor to shut off when the engine is warm?

- what is the function of the vacuum temperature switch located on the
driver side of the head next to the valve cover?

- what is the procedure for resetting the check engine light?

Thanks in advance

saeed

One of the penalties for refusing to participate in politics is that you end
up being governed by your inferiors. - Plato [427-347 BC]