Bob Radley (nazarl at idirect dot com) wrote:
> Hello All,
> I have something on my mind that keeps bothering me and so far I could
> not find an answer for it. I figured I'd post it and see if I could
> get some ideas regarding this.
>
> I have a 92 civic CX (canadian model with D15B7)with 300,000 km.
> Car has been running fine, except for the overheating issue I had with
> it when engine was under heavy load. I've replaced the head gasket,
> got the head machined and pressure tested, flushed rad and cooling
> system and that has taken care of overheating.
>
> Ever since this has been done, I've been having an intermittent problem
> where if I rev the engine and then abruptly let go of the gas so that
> the throttle closes abruptly (while driving or at idle, in neutral or
> with clutch depressed, does not matter), idle RPM will drop below 500,
> making it sound like it's trying to stall. It will struggle at this
> RPM for about 5 sec and return back to normal Idle of about 650 RPM
> where it runs just fine. It keeps doing this even after the car has
> warmed up.
>
> Engine by itself runs just fine at other rpm, there are no signs of it
> missing.
>
> I've got few things I am going to check within the next couple of days,
> such as timing belt tension, ignition timing, disconnecting air intake
> pipe, etc. I am just curious if you guys have any other ideas or
> suggestions about what I can try to do or possibly try to eliminate
> some of the possibilites.
>
> I would greatly appreciat some input on this.
> Thank You and Best Regards,
> BRadley

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Your ECU got 'retrained' after the work, and now it's responding
different. Hondas kill the injectors when not needed, and my old CR-V
did that just like yours. Looks wierd, eh?
You could search Google for info about honda ecu training.

'Curly'