majek

I have a 96 honda accord with a 94 h22 and my car idle between 1500- 3000rpm s up and down no matter if cold or warm. I disconnected the iacv and the idle went down 1200-1500rpm stills goes up and down between these rpms, So what could be the problem.

six_speed

open up the iacv and clean it, play with the idle screw, check if the map/tps sensor have the corresponding plugs.

WhiteSol

Possible vacuum leak IMO, the IACV is working and trying to control idle, but it is out of its range. I had a similar problem with a h22 swap and a leaking air bypass valve on the manifold. Prelude ECU or what engine management are you using?

majek

Im currently running a automatic p13 ecu but waiting for my manual p13 ecu could this be the problem

WhiteSol

I believe it could if it has not been chipped, but I am not overly familiar with the specifics of the auto ECU in a M/T vehicle.

majek

So I should just wait for my ecu, whats the difference between any auto and manual ecu

94GSRCivic

I had this problem on my Prelude. If TPS is good then it could b ur fast idle valve under the TB. It cost me 100