I've been having a problem with my s2k for awhile, when turned over it idles decent but misfires, You can hear it from the exhaust I did have a Check engine light prior for a knock sensor I thought that may have been causing it, but it continued after it was replaced and now there isn't a check engine light, I couldn't pull any codes off it I can be driving 60 just running steady all of a sudden i will get a little misfire, it mostly happens in idle and on low rpm Acceleration from Idle If i go WOT It misfires for a second or to, If I rev It around 15-20% throttle it won't misfire through the whole power band I've Checked my valve clearance everything was to spec replaced spark plugs with Laser platinums I'm not sure what to move onto next, Ignition coils, Injectors??
Help a friendly S2k owner out any help would be much appreciated!!

It's a ap1 2000 s2000 With 104k miles!

 

usually you gotta start cheap and go from there.
Swap coil packs around and see if the code changes.
Change the plugs
Change injectors.

 

I had a similar problem and it turned out to be the injectors. I bought a used pair 3 years ago and have never heard that annoying mis/pop at idle since. I never did get around to having the old injectors flow tested or cleaned but they were super easy to swap if you can find another set of used ones or trade a friend.

 

The worst thing about this whole thing is that i'm not able to pull any codes, There is no check engine light what so ever so moving injectors/coils wouldn't tell me, Thanks for the feedback anyone else have any suggestions?

 

I've also tried the MAP whack + zip tie method and gotten nothing! I'm just not sure wether to go with injectors or coils first

 

whoa before you start changing more parts, do a simple compression test and if you get 1-3 cylinders with low numbers than you know you might have an issue. Then do a leakdown test afterwards to kinda see where the problem is coming from. you do know s2k motors misfire from other reasons than injector, coils, map, and plugs. Bent valves, bad head gasket, and bad piston rings can also cause random misfire.

 

My friends car needed a valve adjustment. They were all too tight causing his stumble

 

Valve adjustment has been done, Compression has been done 220-240 all cylinder anyone know any other simple things it could be?

 

did you unplug the battery when doing it?/reset the ecu???

possible faulty injector

 

https://www.s2ki.com/s2000/topic/101...lly-warmed-up/

its injectors