Civic 1989 hatchback (16 valve) engine RPM goes up by itself
 

Hi, my engine is the 16 valve/2 injectors and has been running good.
Recently it started to accelerate by itself!! Usually after its warmed
up a little.

It gets up to about 3000 RPM and stays there whitout me touching the
accelerator!! If I kill it at this point - it floods and can't start
after that for 15-20 min. It does it both on idle and while driving...
Goes up, stays at about 2500-3000 for a while and then goes down to
normal, then again...

Anyone had any similar problems? I tried to check the throttle
position switch - 700ohm closed to 3000 ohm open, intake manifold
temperature sensor - 1400ohm (cold). Where else should I look?

Thanks.

Re: Civic 1989 hatchback (16 valve) engine RPM goes up by itself
 

Vacuum leaks either through cracked hoses etc. or through a
malfunctioning fast-idle thermo valve. Many people suggest spraying a
fine mist of carb cleaner around the various places of the engine, but
carb cleaner can be hard on plastics. I have used rubbing alcohol, but
suspect plain water would do just as well. If your spray hits a spot
where there is a vacuum leak, the engine will slow down noticeably.
Don't know what your engine looks like, but you may be able to plug the
port for the fast-idle valve with your finger if you remove the air
intake boot. If that slows down the engine, the valve is probably bad.

kiko wrote:
>
> Hi, my engine is the 16 valve/2 injectors and has been running good.
> Recently it started to accelerate by itself!! Usually after its warmed
> up a little.
>
> It gets up to about 3000 RPM and stays there whitout me touching the
> accelerator!! If I kill it at this point - it floods and can't start
> after that for 15-20 min. It does it both on idle and while driving...
> Goes up, stays at about 2500-3000 for a while and then goes down to
> normal, then again...
>
> Anyone had any similar problems? I tried to check the throttle
> position switch - 700ohm closed to 3000 ohm open, intake manifold
> temperature sensor - 1400ohm (cold). Where else should I look?
>
> Thanks.

Re: Civic 1989 hatchback (16 valve) engine RPM goes up by itself
 

kiko wrote:
>
> Hi, my engine is the 16 valve/2 injectors and has been running good.
> Recently it started to accelerate by itself!! Usually after its warmed
> up a little.
>
> It gets up to about 3000 RPM and stays there whitout me touching the
> accelerator!! If I kill it at this point - it floods and can't start
> after that for 15-20 min. It does it both on idle and while driving...
> Goes up, stays at about 2500-3000 for a while and then goes down to
> normal, then again...
>
> Anyone had any similar problems? I tried to check the throttle
> position switch - 700ohm closed to 3000 ohm open, intake manifold
> temperature sensor - 1400ohm (cold). Where else should I look?
>
> Thanks.
================

kiko,
Check for coolant in rad and reservoir, also.

'Curly'

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