Engine misses when idling at 800 RPM when warmed up

Erratic Idle On Civic - YouTube

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My 1994 Honda Civic SI has an erratic idle. It stays at 3000-3500rpm when started cold till it warms up then ...

High idle and constant up and down idle on my 94 civic ex? ' Yahoo ...

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Oct 27, 2011 - Okay so im learning lots about Honda's, i have rebuilt motors and put them but i cant ... It has a constant up and down idle between 1200 and 2000 rpms. ...to a near stall for a fraction of a second, then jumps back up, like clockwork. ... No coil packs on your 1994, of course - just one coil and a distributor. Rpm jumping up and down at warm up 1k to 2k 97 honda prelude ...
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" Hunting" is usually indicative of a faulty temp sensor or air flow meter telling lies to your computer.
It can also be vacuum leaks, however these are usually apparent even when cold.
Male sure you don't have any air locks in your cooling system.

ya but the motor mount might need to moved or changed

If it's not vacuum leaks, it will be you idle control sensor.

I had the same problem with my honda. On the throttle body there is a screw that controls idle speed. If your idle speed is around 800-1000 rpm in neutral, tighten the screw a quarter turn each try until the idle speed is around 1500 RPM. Did this stop the idle?

The person that told u that it was the tps and idle air they we're completely right!! The tps sensor is what makes it do that. If you pull the air intake of there's 2 holes on the throttle body. Plug one of the off with your finger while the engine is idling high and it should come down mine was the top hole. If it does go down just get a new tps sensor. and the back sensor on the intake to be safe. or the ghetto way is to plug the hole off, not my sugestion.

either low coolant or your IAC motor is acting up

Sounds like it may be a vacuum line problem...double check all the hoses and make sure none are off or broken/missing. Check over the IAC (Idle Air Control) valve too and inspect & clean it out with carb clean or something, could be that the valve's sticking

dude its normal for first start or cold start that the idle is ok but it must high than normal... its normal because the engine is warming up it self... when it gets warm, the idle speed will return normal idle... your engine is 1200cc, it has not much HP for a great load... and i know its a carburatored engine and its an old engine, your head lyt and a/c fan and aux fan and all the electrical system on your car, uses the HP of you engine and its a lot of load to the alternator driven by the engine to generate an electricity they need and thats why the engine rpm speed lowering down to dead and its shake. thats why when you use your lyts or all electrical, you engine is weakening... the best remede is adjusting you idle speed... its located behind the carburator.. its a small black knob.. just make a twist each eighter way and you'll find out if your idle rpm speed ts incresing or decresing.. just increase it and try opening your lyts and other electrical, if its still shaking then adjust it a little more

Spark plug wire