Idle bounce/high idle

[Dark Soldier58]

hey guys, i got a 95 integra ls and my cars been idling high, like to about 1800 rpm to 2200 rpm, and when its really cold out it'll sometimes be higher like 3000. When it finally warms up it sometimes sits at 800 rpms for alittle while when i get lucky, but it usually will sit there and bounce from 1000 to 2000 rpms at idle. Other times it'll just idle at 1500 rpms. I've cleaned my IACV and checked my timing and it hasn't fixed it. Any ideas on what it could be?

[LS/Vtec]

fitv

[LS/Vtec]

First things first, you have to determine if your FITV needs cleaning. Now if you’ve never done it before it probably does unless you bought a complete new one.

Reasons why you should take it apart and cleaning it:

-High idle before your car warms up, above 1500-1800rpm
-Lumpy idle
-Roaming idle
-Hunting idle
-Fluctuating idle


Tools Needed:

Ratchet
8mm Socket
10mm Socket
Pliers
Flathead Screwdriver
Throttle Body Cleaner or Brake Cleaner
Paper Towels
A cooled down engine for at least 2 hours

1) Now you got to locate where the FITV is. If your car is 1996 and newer you don’t have one. But for the older Gen 3 models like me, we do. Pop your hood and it’s located directly beneath the throttle body. It’s actually connected to it.

Attached to the FITV is one coolant line. This is how it looks with the intake on



This is how it looks with the intake removed



2) Now that we’ve located it, Remove your intake and strut tower bar (if applicable). Next remove the one coolant hose that is attached to it, using the pliers to loosen the clip. Have lots paper towels underneath to catch the coolant when it leaks out.



3) Next is to remove the three 10mm bolts located at the bottom of the FITV. **Note the intake manifold here is upside down to make it easier for you to see**



After it is removed from the engine it should look like this



Now spin it around to located the two 8mm bolts



4) After you located those two bolts remove them carefully and you should be left with this. Sorry for the blurry picture, I was cold and shivering.



5) Now unscrew it with a screwdriver





You should be left with this



6) Now take it apart and give it a good cleaning with the throttle body or brake cleaner. This is what we should have taken apart so far minus the cap and two 8mm bolts



Before





After



Semi put back together and cleaned



All cleaned up and back together



7) Clean up the inside of the FITV body like so



8) Now screw it all the way back in or back to where it was before if your car idles fine.





Side view shot through the hole. It isn’t screwed in all the way since my car idles fine at that position. Screw it in more if your car idles to high. The opposite if it idles to low.



9) Now put the cap back on and tighten the two 8mm bolts back down.



10) Reinstall the FITV back on your car following steps backwards from step 3 to step 1

[Dark Soldier58]

Nice guide thank you very much, i'll have to try that and see if it helps

[LS/Vtec]

A easier way to do that. Is take those 2 hoses, dis connect em from the throttle body and hook em together with like a lil fitting or something. So they aren't even hooked up to the throttle body.

[mark11017]

Vac leak! Larry is correct FITV that screw likes to come loose causes a vacuum leak resulting in hunting idle or flucuting. If that doesn't fix your problem try switching out iacv it maybe be faulty.