Since the temp has dropped my 98 d16y8 Civic won't high idle at start. If I don't keep my foot on the gas she shuts off. I keep my foot on the gas for 30 sec. and she low idles way low around 200 rpm.
Runs and Drives fine.

 

Clean the IACV.

Any CEL codes?

 

Have recurring code for O2 but is actually Cat. Conv. issue

 

I guess it'll have to wait if it needs cleaning
minus 20 degree wind chill here

 

Nope

 

How do you check the cat I have replaced the 02 and I suspect the cat is going. The Engine light comes on maybe for a week then its off for awhile

 

The iacv needs to be cleaned as stated above. As far as a bad cat/o2 sensor. Are you sure you replaced the correct sensor and what brand o2sensor did you purchase?

 

If you smell rotten eggs then it's gone. But I also think there's a tempeture inlet and outlet test you can do.

Clean or replace the IACV. Also if you can get the code that'd be better.

 

Now I may be confused but doesn't the fitv control the high idle on a cold startup? I thought the fitv allows more oxygen to enter the throttle body and raises the idle when the temp is low.

 

The 96's and newer don't have a FITV.

 

Oh that makes sense. Thanks