My b16 has always idled almost perfect at 750. recently, the idle has started to fluctuate betwen random rpms and at random times. sometimes it will go between 1 and 2 grand right after I start it up...and then sometimes it will go between about 800 and 1200/1500 after it is warmed up for a while. usually it still idles fine, but this has been happening more and more of recent. I have done searches, but could not find anything specific to my case...I checked my vacuum hoses and they seem good...I know there are a bunch of things to check and replace(fast idle control, IAC, etc), but can anyone pinpoint this to a specific part or problem??(before I start buying stuff!!) Thanks!

 

Ok, I had this issue and it sort of went away after I did the following. First, I flushed the rad and then filled it again. Then I adjusted the Throttle cable so that it has a tad bit of slack and verified that all nuts where tight (key issue 1 for me) then I bleed all air out of the coolant system by taking a rubber hose and placing it back into the resovoir container. I used a 10mm wrench and began bleeding off the system. After that everything was fine.

 

my friend had this problem with his N/T '94 eclipse. the spring in the throttle body crapped out, causing him to idle at about half-WOT. It ended up costing him a new clutch, etc. I thought it was pretty funny that a $1 or so spring costed him over $400 in damage lol

 

try cleaning your IACV first with carb cleaner.

 

Thanks, I will get on those tasks asap...I was wondering what the coolant/ radiator has to do with my idle though. my car doesn't run hot or anything..

 

sometimes the T cable gets stuck

 

cleaning the tbody should help i had same problem on my ek hatch