Idle RPM's go up and down when at idle

[Maple50175]

Idle control valve gone?

this is on my 90 accord. I'm dumb and forget what would cause this. It's super annoying. When im at idle or stopped the car revvs up and down..

Let me know what could cause this and I will get it replaced asap

Thank you!

[ChIoVnIdCa]

Idle control valve gone?

this is on my 90 accord. I'm dumb and forget what would cause this. It's super annoying. When im at idle or stopped the car revvs up and down..

Let me know what could cause this and I will get it replaced asap

Thank you!

Cars broken

[4CYLPOWER92]

look at your vacuum lines first.

[bcjammerx]

Idle control valve gone?

this is on my 90 accord. I'm dumb and forget what would cause this. It's super annoying. When im at idle or stopped the car revvs up and down..

Let me know what could cause this and I will get it replaced asap

Thank you!

I think you should search as this is one the most well covered issues our cb's have and is posted about at least every other week

:hint

idle screw
iacv
fitv

in that order...now go...search...be fulfilled! FILL YOUR QUIVER...and some shit

[92bently]

yeh there is definately a post on here at least once a week on this subject, prolly the fast idle thermo valve bad, but could be other things, follow the list in the post above mine and go from there

[bobbycos]

thanks for the hints on how to search for this problem

[BLUBB2]

I think you should search as this is one the most well covered issues our cb's have and is posted about at least every other week

:hint

idle screw
iacv
fitv

in that order...now go...search...be fulfilled! FILL YOUR QUIVER...and some shit

Um adjusting that screw does nothin to fix your jumpy idle.

My order:
1. Might be air bubbles in your coolant lines.
Bleed if so.
2.Clean IACV.
3.Clean FITV.
4.If that dont help, Replace them.

[bcjammerx]

Um adjusting that screw does nothin to fix your jumpy idle.

My order:
1. Might be air bubbles in your coolant lines.
Bleed if so.
2.Clean IACV.
3.Clean FITV.
4.If that dont help, Replace them.

Uhm...actually...yes it does...this was EXACTLY the problem I had and fixed by adjusting the idle screw.

I shall elaborate as I can see in your eyes you doubt me...do this, and humor me for a second...that vacuum line coming from plenum going to the pcv valve? Unplug it from the plenum...notice the engine now revs up down up down etc...

Know what happens when the idle screw is too far out? SAME thing as a vacuum leak...it lets too much air in. I know because this is how I fixed MY idle issue (just like the op's). Mine would loosen itself after 3 weeks, so I ended up doing all this other crap for no reason...more than once...then I put a new gasket on the screw...problem solved!

SO first check to make sure your idle is actually SET right...if it isn't and you skip this...you'll be fixing shit for no reason wasting your time.

I've had a shit load of air in my coolant and it never did this...but it's easy to check so why not

THEN check your iacv
then your fitv
then if still no go check for vacuum leaks around gaskets.

thanks for the hints on how to search for this problem

no problem...I see where I can help and I do

[kouzie]

Uhm...actually...yes it does...this was EXACTLY the problem I had and fixed by adjusting the idle screw.

X2....it fixed mine..

[mak]

My car idles as described as well.. but only in the dead of winter, and only if it's been outisde overnight.

-mak

[f22a1accord]

sounds like your car is doin the same as my 90 accord lx. im replacing my idle air control valve this weekend to fix the problem

[Flatline]

Cars broken

don't be a D-bag post whore. that in no way helps anyone.


i actually had that problem after a little game with a celica. well all i did was clean my air filter and i used some intake cleaner on the TB. i think my MAP sensor was dirty because my filter was filthy.

[Maple50175]

don't be a D-bag post whore. that in no way helps anyone.


i actually had that problem after a little game with a celica. well all i did was clean my air filter and i used some intake cleaner on the TB. i think my MAP sensor was dirty because my filter was filthy.

it's okay he lives 2 houses up from me

[Flatline]

it's okay he lives 2 houses up from me

okay sorry for the jump on that... i just got done telling a noob about post whoring b/c he out right said that the post he made saying "How do i change my oil" was deliberately to get his posts above 30......

so i was in post whore elimination mode or something


I probably should send you this in a visitors message or something next time to quit the hypocriticism huh?