Hey guys, need some help before I spend my weekend trying to diagnose an issue that just started tonight... Also if you know of a reputable shop in the DC/Baltimore area, please let me know because I'm going to need to take my car in.

Long story short, I accidentally ran my car up about 600rpm past red line and I instantly noticed something wasn't right but I can't tell what. It idles a little bit more rough than it used to, it back fires at idle (this is new), but it appears to be fine at speed and holds boost no problem, although I haven't brought it up past 3k since.

You can see the mods I have done in my sig block, and it maxes at 25psi according to Buschur's dyno printout. I'm guessing it's internals (crank/rods) but I'm a muscle car guy by trade and I've only had it since April so I'm still not as educated as I should be about the 4B11T. It's probably worth noting that the CEL came on later, after I turned the motor off. I'm going to run a diagnostic on it tomorrow and see what code it threw to maybe point me in the right direction.

That all having been said, any advice/ideas/suggestions? If someone says "shift earlier," I'm sending hate mail lol

Thanks.

 

id reccomend you start by doing a compression test of all cylinders

 

^Thats a good start, I would probably pull the valve cover off too. Maybe you hurt something in the valvetrain...

 

Good suggestions guys. Thanks for the advice. I'm going to start on it in a bit and send an update if I figure it out. Until then, it's back to driving the trusty Civic.

 

Update: Can't figure it out on my own, so I called Atlantic Motorsports and scheduled it in for today. Tow truck is on the way. FML.

 

Turns out it was my stock MAF going bad, along with a slightly charred plug. Got it fixed and then got some new mods done. Yippee.

 

Good luck. Hope everything is okay!