idle problems

[bojanglz]

I have a 93 honda civic dx. My problem is that when in neutral my car idle fluxuates up and down anywhere between 1000 and 5000 rpm. I have an after market muffler and air intake. Does anyone know what is the problem and how to fix. Please help.

[QUICK_EG_B16A]

I had a very similar problem, it turned out to be the idle control valve. Luckily mine was able to be cleaned and reinstalled, but if yours is fluctuating that bad it may need to be replaced. It's in the throttle body. On the majestic honda website it's only about a $75 part, I'm not sure how difficult it is to change it as I had a mechanic do mine for me.

[AudioGuy93DelSol]

I had the same problem after my car sat for about a month. I but a full tank of gas and Lucas fuel system cleaner in my tank and its never heppened since. I'd say try that before you go replacing parts.

[eurobeaner]

mine does it now that its colder out..... 30-40 degrees... id dosnt stop until my car warms up

im just gonna stick a new throttle body on it for free off my buddys old z6.... i hope thatl fix it.... its quite annoying

[nynewyorkcool]

Originally Posted by bojanglz

I have a 93 honda civic dx. My problem is that when in neutral my car idle fluxuates up and down anywhere between 1000 and 5000 rpm. I have an after market muffler and air intake. Does anyone know what is the problem and how to fix. Please help.

does sound like iacv( idle air control valve) could be throttle position sensor too...idle air control is located on the throttle body and easily removed with a t25 torx bit(there are two of them)..take it off and spray it out with some electrical parts cleaner and replace it if the problem persistd relapce the part

[bojanglz]

Where is the idle control valve located on my car. Is it easy to replace?

[bernards24]

i have a 96 civic and i m having simular idle problems but my civic idls up and down between 1500 and 1700 now i have replaced the air idle control valve the tps and map sensors well they were used except the aic thats new, i also change the ecu/ecm, intake manifold
still the car idles the same and the cod 1508 witch is air idle controld valve circuit failure i need help please im stuck

[unknownlogistic]

i have a 95 civic ex and mine does it too ...haha...between 900-1300 and when cold from 1300-1700

[tune up]

Originally Posted by bojanglz

Where is the idle control valve located on my car. Is it easy to replace?

its at the back of the trottle boby,two hoses,one plug in,two 8 mm bolt,take it off,clean it with air intake cleaner (the two litle scren)try it back if itdont change u have to change it but before make sure its not your TP sensor (i hope for u because if it is u have to change the trottle body)did your engine light come on? if yes just go for an computer test in a garage its gonna tell u what it is.....and there ,well ,do what u have to do......it happen the same thing to me, i hade to change it but by chance i havea couple a those in stock .......(i kinna have three engine in stock........

[newspeed]

hopefully this helps because i know how annoying it can be to go through and to replace parts that dont need replacing try taking out the idle adjusment screw from the throttle body an put some locktite on it put it back in an adjust your idle to spec.
the reason why this happens is because the screw actually backs itself out with all the pressure and vibration.causing it to idle erraticly good luck