Hondata

Drive the car in "open loop" and then see if it happens. Right now it's in "closed loop".

crucian,
I will try. I suspect it is some mechanical parts that have gone haywire.

This afternoon, when I throttled, the rpm dropped normally but became stucked at a lean cell. The wideband afr showed "---". Then suddenly, it jumped up to normal.

If I back-tracked when the problem started, it was the cleaning of the idle control valve that started it.

What do you think...?

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+65-9296-5336

Hmmm.... That's a good question. Recheck the wiring and installation of the IACV again. Like I said run it in open loop and then re-post.

crucian,
I ran the car on open loop this evening and all was well. But when I switched to closed loop again, the same problem happened!

Now I know why you wanted me to run on open loop. It is to test the O2 sensor, right?

You are so clever! Now, problem is solved. I will continue to run car on open loop!

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+65-9296-5336

I never run my cars in closed loop cause I could never get it to act right. I just give them a real good open loop tune at part throttle.

after driving or rev and the rpm drop and slowly rise... you should ad a tad more fuel from the table and move the IAC Duty Cycle to the right. If that dont work then also add 2 clicks up on the ignition table. Last but not least....Idle speed vs coolant set water temp 141 to 1050 - 177 to 1001 - 302 to 950 also do for the other.