Normal idle, then fast, then normal

[Kempe]

Havent used the EK1, D16Y4 for a while and the battery was dead.
Fitted a new one and all was good except the idle.
She idles normal for about 3 seconds, speeds up for about 3 seconds then back to normal for 3 seconds, speeds up etc etc etc
No misfire and no power loss everything is fine except idle.
Have run it for a couple of days now incase it was the computer relearning but dont think so.
Any idea where to start with this?

[dc2r-0636]

Try cleaning your IAVC

[charliebrown]

Start by cleaning IACV and FITV(if you have one?) and check for vacuum leaks

Check ECU for codes and look into dizzy and adjust timing after doing the above

[mytfoz]

http://www.ozhonda.com/forum/showthread.php?110641-D16y4-IACV-Clean-and-Throttle-body-removal.-Revs-hunting-Look-here.

[Renaissance_x]

Sounds like a vacuum leak.

[Hellomotog]

X2 vacuum leak

[eren]

Clean Throttle body , IVAC , Vaccum , do some Seafoming. etc. its more of a blockage/Dirtnes issue by the sound of it . nothing to worry about.

[Kempe]

its more of a blockage/Dirtnes issue by the sound of it . nothing to worry about.

Dropped it into the dealer today, charged me a pittance as they only belted the stepper motor with a hammer a few times and cleared the muck out.
If it happens again will need a new stepper motor and radiator flush at a cost of $700, that wont happen tho will learn how to do it myself