X5m new plugs many missfires

[Pepe_pr]

Recently i did a valve cover seals job
New Downpipes and tune

First i was having a miss-fire on cylinder 1

It happened when i driver over 3,000 rpms


Now the miss-fire is on to cylinder 7

And now the code is instant and reduce power effect


I was thinking it might be a spark plug gap issue?

[Dawgz]

Originally Posted by Pepe_pr

Recently i did a valve cover seals job
New Downpipes and tune

First i was having a miss-fire on cylinder 1

It happened when i driver over 3,000 rpms


Now the miss-fire is on to cylinder 7

And now the code is instant and reduce power effect


I was thinking it might be a spark plug gap issue?

What did you gap it to? Also which plugs are you running?

Could also be the coils.

Take coils from 5 and 3 and swap them over to 1 and 7. See if the problem migrates to 5 and 3.

[JMAN1111]

Change all the coils

[Pepe_pr]

I will gap the new spark plugs

If that does not work i will change the coils

[Dawgz]

Originally Posted by Pepe_pr

I will gap the new spark plugs

If that does not work i will change the coils

Gap to .022

I use ngk 97506

[Pepe_pr]

Tomorrow i will gap them to see if i can isolate the issue.


Not really wanna buy 8 new coils if its not necessary

[Dawgz]

Originally Posted by Pepe_pr

Tomorrow i will gap them to see if i can isolate the issue.


Not really wanna buy 8 new coils if its not necessary

Yea but thats why i mentioned to move the coils from 1 and 5 to one of the other cylinders. This way, if you get a misfire on the other cylinders, you know that coil was bad.

[Pepe_pr]

Will
Do today

[Pepe_pr]

Did dome testing And i gave a bad coil.

Just placed an order for the full set at fcp

[Dawgz]

Originally Posted by Pepe_pr

Did dome testing And i gave a bad coil.

Just placed an order for the full set at fcp

Which ones did you go with? Eldor is suppose to be the best these days.

[Pepe_pr]

I was trying to order on line the OEM fcp
Sales but having issues with my zipcode

[Pepe_pr]

Just purchased the new bosh kit

[clueless69]

hi just wanna add some info.X5M get limbo mode with misfire on cylinder 8 CODE P0308 replaced ignition coil from 8 to 5 and get P0305 bought one coil from autozone Bosch Coil On Plug Ignition Premium Replacement Ignition Coil 0221504470
Part #
0221504470
SKU #
706107 price 62.99$ runs like dream now! hope it helps someone

[Mightymaus]

Eldor coils are the ones you need to buy. You ll find a good price online, I used Autohaus. Eldor are replacements for some other coils BMW tried. Eldors are supposed to be on the new BMW motors. Eldor are also less expensive by far than what you will find at a local auto parts store.

If the author that started this post has already changed the coils with something else and its running fine? You re good dont worry about the Eldor coils, I dont think you ll see a difference by changing them if your no longer mis firing.