so on a cold start my car does the infamous Honda up and down idle. any suggestions?

 

If your engine has a FITV, then try cleaning it.

 

to clean FITV

https://honda-tech.com/forums/showthread.php?t=1564019

u might want to clean the IACV as well if the FITV does not fix ur idle problem.

and i quote
"
Quote:
Originally Posted by Sam92Teg
I'm confused. I thought the FITV--Fast Idle Thermo Valve was supposed to raise your idle when the engine is cold, that's its purpose, and then when the engine warms up, the valve closes and has no impact on idle at all.

The IACV--Idle Air Control Valve impacts the idle speed at operating temp.

Hmm, now that I think about it, if the FITV doesn't close when the temp rises, then that would create a vacuum leak and therefore negatively impact the idle. I do believe that more idle problems would be from the IACV than the FITV.

Nice write up.

You are correct

You'd be surprised at how many problems are due to a clogged or dirty FITV. It would seem that the IACV would be more problem, but that's only because they got rid of the FITV in newer models. I believe it's 96 and up (OBD2) vehicles. So for us OBD1 and OBD0 cars this is our main problem. I shall have a how-to on how to clean the IACV soon. "

 

I noticed from your other thread that you have a B16a2 engine, which I presume does not have a FITV.

Is the CEL ON?

You may have a vacuum leak (hose from IM) or intake air leak (throttle body or IM gasket leak).

 

screw in the white plug inside the FITV

or tell everyone you have a cam with 1.2" lift and 400 degrees duration 200 degrees overlap. gangsta gangsta

 

i have a b16a no american bull****