[street 335i]

I have a fbo 335i with percison race works ignition kit and a 3.5 bar on charge pipe. I'm running stage 2+ and am having problems with top end 3rd gear and also a misfire that won't go away after hard driving even after restarting and retuning. Looking for any advice I'm 16 and don't have much experience thank you. [IMG][/IMG]
Turns out it was the mosfets for cylinder 123 went bad code found was 30ba after I rewired the coils check spark plugs and everything else.

[stewbets]

My advice would be to avoid the top end of 3rd gear until you reach the top end of your 20's. Ha, I crack myself up!

But seriously, my first step with a misfire is always to swap a couple coils and see if it follows the coils or the cylinders. Move on to the spark plugs next if it's not the coils.

[DTOAST3]

Are you receiving any check engine codes? Scan the car. Even if the check engine light is not on, there could be a pending code that can give you a hint.

Changing the coils around is free and one of the first things to do, but the idea is that if you are receiving a misfire code for cylinder 3(have to scan the car to know this), then you want to swap that coil with another and see if the misfire code changes from 3 to whatever cylinders coil you swapped.

[street 335i]

Originally Posted by stewbets

My advice would be to avoid the top end of 3rd gear until you reach the top end of your 20's. Ha, I crack myself up!

But seriously, my first step with a misfire is always to swap a couple coils and see if it follows the coils or the cylinders. Move on to the spark plugs next if it's not the coils.

I just got new coils so I don't believe it is that I think it might be the spark plugs I will check the gap

[street 335i]

Originally Posted by DTOAST3

Are you receiving any check engine codes? Scan the car. Even if the check engine light is not on, there could be a pending code that can give you a hint.

Changing the coils around is free and one of the first things to do, but the idea is that if you are receiving a misfire code for cylinder 3(have to scan the car to know this), then you want to swap that coil with another and see if the misfire code changes from 3 to whatever cylinders coil you swapped.

I'll do some checking with the coils thank you but it occurs at random times

[stewbets]

Originally Posted by street 335i

I just got new coils so I don't believe it is that I think it might be the spark plugs I will check the gap

I've had brand new coils fail before. It's so non-invasive and easy to swap that it makes sense to start there.

[street 335i]

Originally Posted by stewbets

I've had brand new coils fail before. It's so non-invasive and easy to swap that it makes sense to start there.

I will give it a shot thank you

[DTOAST3]

Either way, if you can pull a code then you will know exactly which cylinder to examine.

[stewbets]

Originally Posted by DTOAST3

Either way, if you can pull a code then you will know exactly which cylinder to examine.

Ah, now I see what you're getting at. Since he mentioned 3rd gear, I mistakenly had it in my head that he had a cylinder 3 misfire. Yeah, of course you're exactly right. He needs a code reader for sure!