CAR IDLE ENGINE REVS

[blackant]

After 35mins driving, mix of traffic, all of a sudden the accelerator steps down a little and the revs climb to 1600rpm. They will stay there, intermittently dropping back to idle then returning back up to 1600rpm.

If you leave the car for a while and return everything is normal. Not related to fans coming on either.
Sensors or air intake?
Any ideas?
Thanks

[fattima]

Presume you have an NA6 or 8? (Helps if you put this info when posting in the future)

http://www.miata.net/garage/KnowYourCar/S7_Idle.html

Search the forum too, it has been gone over heaps of times.

[blackant]

Oversight.
1989 NA6 STANDARD INTAKE/EXHAUST
Revs are rising NOT dipping

[gobsmax]

coolant sensor on back of engine block

[fattima]

Revs are rising NOT dipping

Did you read the link properly, revs rise THEN dip. I've had it happen. Easy thing to check and a fairly common issue.

[blackant]

Fattima - Yes i did read it, something which you appear to be incapable of. The revs rise and never drop below idle CLEARLY STATED. This continues and is not related to being at a stop, again 'stop' is CLEARLY NOT MENTIONED. The 'link' is related to the idle, mentions taking your foot off the accelerator when I CLEARLY mentioned the accelerator actually moves in a downward direction. The 'ambient-mechanical' setting isn't relevant as I CLEARLY mention that it goes back to idle.

Thanks gobsmax, will start there.

[fattima]

Wow.

Enjoy chasing problems on your car, don't think you will find many people wanting to help you out with your attitude. So let me CLEARLY state that you are a hottie.

[GP]

I've heard of the idle dip several times which mine does but I've never heard of your problem.
And I don't blame you for your retort, There's some stirrers on here like evrey forum