Ford Motorcraft Ecoboost Spark Plugs SP-534 (Set of 4) CYFS-12Y-T3
For the Ecoboost, there are two main plugs we recommend. Stock OEM SP-534 aka CYFS-12Y-T3 and NGK 6509. Some applications may require 1 step colder, but for most all we recommend these two plugs.
Both should be gapped at .030 or .032. The SP-534 has the benefit of being very close to .032 out of the box. We still recommend verifying gap before installing.
This listing is for a set of 6 plugs, gapped at .032 (verification required). These are OEM Ford Motorcraft plugs. We recommend changing the plugs at every other oil change or around 10-15k miles.
Common symptoms that show spark plugs should be replaced are a rough idle, mis-fires, P0300, P0301, P0302, P0303, P0304, P0305,P0306, cutting out when accelerating, rev limiter feeling.