cyl 4 misfire
 

2011 5.0 a6 with steeda cai, pypes x-pipe, magnaflow over axle and muffler. When rps sit over 3k for some time and let car engine brake I'm getting the wonderful blinking engine and cyl 4 misfire. Dealer replaced coil and plug last week. Still getting it. Code has not hard set since coil and plug were replaced but I usually get it at least once a day. Any thoughts? Just uploaded my tune today from Kevin. Any thoughts?:devilfinger:

Since it is doing it in a specific RPM range, my guess is it is tune related issue with fuel delivery. If it were a bad part, it would be missing all the time. My guess first would be tune related. If not, maybe the injector for that cylinder isn't working properly.

I just got my tune uploaded from Kevin so I will check today driving home and see what happens. I bought the car with the Steeda and the dealer flashed the comp. I'm thinking the Steeda was causing it because I know with the Steeda intake it requires a tune.

Sounds like a COP issue.

COP as in coil on plug? Already had the coil and plug replaced through the dealer. Since the tune I have not had an issue yet. Still need to data log and send it back to Kevin.

Yeah, coil on plug. But if you haven't had the issue since yo uput the tune on, no telling what it was.

Yeah as of now I have not had an issue yet. I will see how it does tonight because I will be getting off in an hour or so.:party52::party52::party52:

Any update on this issue? Hope the car is not having any problems.

Its come back about one blinking cel a day and hard sets about every 2-3 days. Hit last night and I couldn't drive cause it would buck. Shut it off on the highway and coasted to a stop. Started few mins later and hard set cel was gone and was running perfect. It will be taken back again to the dealer for a few more things to get fixed. The will check everything again.

Man that sucks. I had to take mine into the Ford dealer to have a crankshaft position relearn due to getting random misfires (P0300, P0304, P0307 codes for random, cyinder #4, & cylinder #7). This normally only happens when people pull the engine or transmission works as the sensors are often unplugged and not reset. Don't know if that information will help you or not, but it did fix my problem. Simple reset and relearn with Ford's IDS tool.

Keep us updated and hope it's an easy fix.

http://www.svtperformance.com/forums...p0300-cel.html

There is a tab for this issue.

Didn't know of that thread. Powers of the internet coming to the rescue.

Thank you sir! Calling dealer now that i have some fire power about it:boxing::boxing:

With this being replaced I know they have to reflash the comp. so I am guessing it is best to put my factory tune back on before pulling up to the dealer?

No problem buddy hope it works out!