Around May of this past year I got my head rebuilt due to a blown head gasket. When replacing the gasket they found that the retainers were cracked and I was lucky enough to have found that before my engine was done. When my friend put the motor back together I guess the old intake cracked from the circled part. It cracked where the hose connects but on the intake part. At first I didn’t notice it until i started hearing a hissing sound and then the CEL came up. I’ve been getting some backfiring and a bit worse mpg. I purchased a new intake hose from hondapartsnow and it should be getting here this week. Will this fix the CEL because I’m no longer getting misfires on cylinder one as I was getting before I fixed the head gasket issue, now it’s that p0411. I don’t believe I have another vacuum leak on the car and only thing I can think that is causing the cel is that ripped intake.

Thanks for anyone who responds!

I can post a picture of my actual car tomorrow since it’s pretty late right now so I added a random photo from google to show where the crack is.

 

I don't think that would be a source of your cel, but it did need replacing to keep the air stream clean. Back-firing is usually a sign of an exhaust leak, or running overly rich, perhaps a coil or injector issue, hard to say without exploring further. Hopefully the new intake pipe will help but it may not resolve all of your issues.

 

Thank you, Billman replied to my post in a different thread. I posted pictures of the issue on there https://www.s2ki.com/forums/s2000-un...-help-1205727/
Hopefully after a few drives the CEL will go away? or how long until so?