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2364-ISP-AA

Iridium Spark Plug Set [Mk7 Fiesta ST]

EcoBoost engines running substantially higher boost pressure or increased levels of tuning compared to the OE power output can experience reduced spark plug life resulting in lower engine performance, misfires and rough idle.

Increased wear is typically seen in the form of increased spark plug gap and degradation of the electrode. Using spark plugs that are optimised for increased power ensures maximum performance.

Extensive in-market validation at extreme boost / cylinder pressures was undertaken to ensure optimal performance was achieved, whilst also making sure reliability and drivability wasn't compromised in colder ambients.

Each set is supplied pre-gapped by mountune to optimise the setting and allow for easier end-user installation.

The NGK LTR71X-II is one step colder than the original spark plug.

Applications:

  • Fiesta ST 2012-2017

Features:

  • Smoother acceleration
  • Perfect for high boost applications
  • Supplied pre-gapped by mountune

Please note: Supplied in a pack of 4 plugs.

Customer Reviews
5.0 Based on 9 Reviews
5 ★
100% 
9
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Filter Reviews:
    G
    24/08/2023
    Graham
    United Kingdom United Kingdom

    Engine smoother.

    Great plugs, made the engine smoother with the m215 kit. Also bargain price at the Ford fair.

    GG
    23/08/2023
    graham g.
    United Kingdom United Kingdom

    fiesta st 180

    car runs a lot smoother, excellent upgrade from standard plugs on my mt 215 upgrade excellent service from mountune at ford fair as always

    A
    11/02/2023
    Anonymous
    United Kingdom United Kingdom

    Good spark plugs

    OEM plugs looked a state after 10k miles on remap, these made the engine smooth again