Idle knock?

[Dundy2456]

Hey,

So I drove to the shops and while parking I noticed my car idling weird. I was stationary at the time. It was idling at about 1k and every second or so I heard a small knock. With each knock the rpm would dip then return. I listened for a bit.. This went on till I tapped the accelerator. It then went away. I didn't take note of oil pressure. Water temp was normal.

All I've done recently is change ecu and Coolant temp sensors.

Who knows what's wrong? Could potentially be low oil due to a leak I have somewhere. I'll check levels when I get home. Did some light searching so I've probably missed an obvious thread.

Apologies for spamming this section as of late.

Thanks.

[Dundy2456]

Ah, found some light reading to do, as well as some steps to troubleshoot.

1) clean your throttle body
2) clean your ISV
3) clean/oil the throttle dashpot

http://www.miata.net/garage/isc.html