[nydeuces]

I plan on replacing my current spark plugs with Bosch after installing JB4. I am wondering if it is necessary or recommended to change the ignition coils as well.

 

[sptt144]

You can but not necessary unless you experience hesitations (misfires) after you do. You'll know right away and usually it's just one of the coils.

 

[nydeuces]

Thank you for your reply. Hopefully I wont need to and I can save $$$

 

[sptt144]

I bought a couple lifetime replacement coils from Autozone and so far so good. They also look better built than the Bosch coils but who really knows?

 

[Alika808]

How many miles you have now?

 

[CALWATERBOY DUE]

I plan on replacing my current spark plugs with Bosch after installing JB4. I am wondering if it is necessary or recommended to change the ignition coils as well.

Nope. Unless there's a fault they're good.

Injectors same.

Intake valves, not so much! If you're near 60k mi since last blast, time t'do it again....

.

 

[nydeuces]

how many miles you have now?

~43,000

 

[Alika808]

Here are some maintenance schedule for BMW per mileage courtesy of Bavauto.

 

[nydeuces]

Here are some maintenance schedule for BMW per mileage courtesy of Bavauto.

Thank you for that!