I wouldn't bother setting the base idle yet. Eliminate other potential issues FIRST, fix it, then fine tune your base idle mixture.
That said, if RPM's didn't change with the filler cap off AND you didn't feel any Vacuum with your hand over the filler neck opening, you likely have a vacuum leak somewhere else. (i.e. oil breather hoses, to and from oil tank, crank case underneath intake via filler neck or PCV valve, etc.)
Recommend the AFM swap NEXT if you rule out vacuum leaks.
Cheers.
Quote:
Originally Posted by gcredantporsche
I didn't notice any changes in RPMs with the oil filler cap off, which was a surprise. I bypassed the ICV with the engine cold and set the idle then. Should i set the idle when the engine is warm?
I'll check the flywheel speed and reference sensors. I haven't done that yet.
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