Rough idle ford windstar

I have 2000 ford windstar with 3.8 engine. I have been reading up on the idle problems with these vans. However, most responses are in regard to the engine stalling and/or it trips a code. My does not do this. Sometimes the idle is rough and other times everything is smooth. I am thinking it may be an egr valve or dpfe valve. What do you guys think?

I think with no codes being thrown gas pump. Regular maintenance is up to date?

yes regular maintenance up to date plus. Checked fuel pressure and it is within limits

The problem might be caused from a faulty Idle Air Control valve.

A faulty IAC valve won’t always cause the engine to stall, or cause the Check Light to come on.

Try the quick test for a faulty Ford IAC valve.

With the engine hot and idling, take the handle of a screwdriver and rap on the IAC valve. If the engine idle speed changes when doing this, replace the IAC valve.


thank’s tester for your advice. I will try the test tomorrow

Tester it worked! I purchased a new iac valve and the idle is good. Thank’s again