Hello,

I'm having problems with my idle. Its about 1500 RMP and never goes below, unless I turn on the AC AND engage (AT car).

Im pretty sure I've a vacuum leak, but spraying car 80 all over the possible spots still not found any.

A ridiculous question, if I unplug the IACV and tap the throttle, i mean, If I seal it with my hand completely off, the engine should die, right?. Cuz mine keeps running and Idle drops to about 800 RMP.

The only place I could not spray Car80 to check for leaks was under the intake manifold. There is really difficult to reach.

 

https://honda-tech.com/forums/honda-crx-ef-civic-1988-1991-3/how-fix-your-idleing-woes-fitv-iacv-2153910/

 

Thank you for your help. My car is a 1999 Civic EX (D16Y8 - AT). Im preety sure i dont have a FITV valve. =(

 

Do you have a CEL (check engine light)?

 

No I dont have Any.

 

if you cant find a vaccum leak, have it smoke tested.

 

If I tap the throttle body the engine should die right?

 

Use carb cleaner to check the vacuum lines. Do it right when you start up your car. Spray each vacuum line with a little carb cleaner and listen for any idle changes. If you hear an idle change when spraying a vacuum line with carb cleaner you have your leak. Real easy trick I picked up

 

I tried, the problem is reach the bottom of the intake manifold. There was the only place i could not reach and spay. =(