Totally normal, expected even, good for you.? Why?? ECU has been used to and made micro adjustments to compensate for dirty cloggy IACV.? So it's running high with new cleanliness.? Solution:? give it time, like 20 startup shutdown cycles.? Each cycle, ECU will make adjustments, and gradually get back to normal.? Don't mess with any adjustment screws....let the ECU do what it is supposed to do.? Still, 2000 RPM cold idle isn't bad so long as it drops down to the 1000 RPM range.? Removal and thorough cleaning of Throttle Body should also be done at same time (new gasket to manifold too), everything gets gunked up and sticky over time.? Wouldn't hurt to also replace PCV valve and clean out interiors of rubber hoses connecting.? Do it now and you should be good for 100K miles of smooth performance (including better MPG, lower Smog Test numbers, peppier motor.)
On Tuesday, April 22, 2025 at 01:34:55 PM PDT, SoquelDude via groups.io <soquel.dude@...> wrote:
Hi!
I cleaned out the IAC valve on my EJ22 swap in my 1990 Westy and am seeing an increase in idle RPM. At cold start, it goes up to 2000 RPM in Park. After she warms up, she drops down to 1100 RPM.
What should the idle normally be set to since this seems high?
