OK, I did a search on this & found nothing that really sounded like my problem, some close though. I have an '89 Civic HB Si with a D16A6, this morning I started driving & noticed my idle was gettin' a bit higher (900-1200 rpm) as I drove, then it started loping, up to 1300-1500 rpm and droping back tp 900-1000 rpm. I shut it off, and restarted it and it was still idling 900-1000 rpm, but steady, then it started loping again. Its not throwing a code either. This is my 1st Honda & I know absolutely nothing about it yet, so any help will be appreciated greatly!

 

Sounds like a vacuum leak. Take the intake arm off and put ur hand up to the throttle body (careful it sucks hard, might hurt a lil). If the car turns off, then you have no vacuum leaks. If however, it doesn't stop then there might be a possible vacuum leak in one of your hoses.

-Jon

 

I found 1 cracked vacuum hose coming off the carbon canister, fixed it & no change, next.

 

BUMP! Anyone? BUMP!

 

Try cleaning out your IACV. They can get gunked up and cause idle problems.

 

I'll try that, umm, where is it, lol? I think I read somewhere its on the back side of the IM, 2 bolts holding it on, right?

 

https://honda-tech.com/zerothread?id=1156086

 

http://www.hondaswap.com/forum...29790