Cool! Good to hear it remedied the stutter at wot. Hope it's the fix for mine as well! Now go out and enjoy the car again while your still on vacation!

 

So I took out the black FPR that came with the car and shook it... it raddled... spooky. So I replaced it with the Green FPR I purchased today at the dealership. fueled her up on fresh 93, warmed her up and WOT.... stutter.. bummer.

Well I guess that narrows it down to the SES light I've had intermittently about crank/cam angle position sensor. I replaced the cam angle sensor and It didn't make the light go away it would be on for 4 days than off for 2 weeks so and and so on. Never affected performance, until now? Bringing it in to the stealership its still under warranty as its bone stock. Hope I get this resolved.

I'll start a new thread after bringing it in and edit this post with the link. So if others run into the same code maybe It will help future owners with my debugging it and all.

 

Well if it makes you feel any better, my car did it again It was 100% ok on a 3 hour drive home with several long pulls between 40-120mph no stuttering. Earlier, I did a long pull in 2nd or 3rd (down hill if that matters) and I got the stutter. It almost feels like the car is pushing back at me. I'll have to make an appointment at the dealer. Total bummer. It's not anywhere near as severe as the other threads describe but it doesn't feel good. I don't get how this is an intermittent thing. Anyone think this could be an issue somewhere outside of fuel delivery? I can replace and diagnose the basics, not this stuff. The car is so new I'm so sad ha ha.

 

Same thing happened to my 2012 Evo X GSR with 4k miles and we couldn't figure it out... It was spark plugs and ignition coils!!!!!!!!

 

I work at mitsu check the plugs and ignition coils or shoot me a pm and I can give you a call. Also can you slowly go throught the RPM's up to reline? And does this problem happen under boost?

 

Whatup Jake! Love running into CT guys that I know from Facebook on the forums. Hahahaha! A lot of guys will suggest to be changing plugs every 15k miles to be safe. In some cases, even sooner

 

I'll PM you but for everyone to see, I can get up to redline under full boost regardless if I choose to, it will stutter a few times getting there. I haven't attempted to get to redline with little to no boost however. I don't notice it in first (could be getting to redline quick vs a long pull in 3rd). I wouldn't doubt plugs being fouled up from it running rich which I could smell the extra fuel. I'm taking it into the dealer on Tuesday cause I'm not paying for more **** :P

 

Hmm thats strange is it only when the car warms up? Because you said you drove for 3 hours and were fine. Seems funky to me.

 

Hasn't happened at all today, didn't happen last night... I would only drive that way after it's 100% warmed up though

 

Well, went on a drive with the dealer's master tech and of course my car wouldn't stutter at all for us. I thoroughly described everything and drove it as close to I could to duplicate the problem. I was heckled for replacing the fuel pump relay ("I don't know why you would do that, you're under warranty, you should not make any modifications at all") - least I know where NOT to take my car after I start changing out parts ha ha. Tech is going to check the plugs, says it's not the coils otherwise it'd throw a code, run a report for any errors... blah blah blah. Will update.

 

Just heard from the dealer. They say it's the piston in the timing chain tensioner. Oh and it's not covered under warranty wtf seriously? Hope it goes through under the extended I bought.

Maybe this info helps you out OP...

 

With my car the coils and plugs never throw a code.... So he is wrong when really comes down to it. That is strange though that you could not get the car to shudder.

 

It's an intermittent issue though - I think I'll just have to wait until I figure out exactly how to make it do that. Due to not being able to replicate the problem we don't know if it's fixed yet. Tech scanned for any stored error codes, there were none. He didn't pull the plugs like originally stated (don't know why). What they did replace though as preventative measure was the fuel pump resistor, fuel pump relay (another new one), and injector relay. I'm hoping it won't come back.

Side note: neither of my back windows would go up, they'd get stuck. They did fix that problem.

 

Another Update! The problem is still there, I did figure out exactly how to replicate the issue so I've made another appointment to bring it in next week. The stutter is noticeable during WOT if I floor it from a dead stop or from a fairly slow speed - while accelerating it'll stutter a few times. What's odd is if say I was to be in 3rd gear going 30 mph and floor it through the gear to redline it won't do it.