Hi, everyone. First post here. I've had my miata boosted for a few years now but ive always had an issue where my car misfires on warm/hot starts until my wideband turns on. It never does it on cold starts. Im running a mspnp2 and was wondering if anyone could guide me on how to fix this issue.

 

Can you post a log of it happening and your tune?

 

You are running too lean when you are restarting hot, when your wideband starts running, it adds more fuel and so it stops misfiring. With an MS2, the only solution is to run more rich when "not hot" and let the wideband do a negative trim. So when you are restarting hot, it will be just about right, and when cold/mildly warm it will rich-ish for a few moments but won't misfire.