[spammer]

So i bought my car @38k miles untuned off lease. bumped it up to stage 2 for about 13000k miles, it ran great & hard on E40 up to 21PSI and taper off. But now... ever since I went BEF + jb4 if i go over 15/16 PSI in 3rd or 4th gear, my #4 cylinder starts to misfire.

I even went down to E20 and 17PSI, seems like it doesn't even try to pull timing #4 just ****s the bed.

Is it time for the colder plugs?

Experiences?

[Payam @ BMS]

Yes, sounds like spark plug symptoms.

You'll need a set of these:

https://burgertuning.com/products/ng...nt=32079075982

[spammer]

Originally Posted by Payam @ BMS

Yes, sounds like spark plug symptoms.

You'll need a set of these:

https://burgertuning.com/products/ng...nt=32079075982

Thanks Payam! Just ordered the whole set with the gapper.

[LeeOrl]

while you are doing the plugs try and swap the #4 coil with one of the others. if the plugs do not correct the misfire and it follows the coil you will be a step ahead on the troubleshooting

[spammer]

Good idea - thanks for the suggestion!

[spammer]

Bought the whole BMS set, and gaped them myself to .22 w/ the tool. just took it for a test drive. Kind of nervous my first time doing it and on a BMW. FREEDOOOMMM!!!

Man, loaded my kill map up to 21psi loaded up on E40 & floored it (of course after a leisurely drive then spirited drive monitoring all cylinders.) everything is beautiful again, hitting peak target w/no issues, banging through gears, foot to the floor the whole way. So relieved. The front end really lifting up like it did before when i first tuned it.

BMW F32 435i N55 Ignition Projects coil packs and spark plugs DIY - YouTube - good video for the 435i on how to do it.

Thanks BMS

[Payam @ BMS]

Awesome!!!