Ngk Spark Plug Issue ?

[Trevor groen]

I have a misfire problem only on start ,runs fine after 3 secs ,could this be same problem ,its on a fiesta 1,25 11 plate ,please help ,thanks 

[BavarianCare]

NGK plugs work perfectly in this engine.

However, NGK & Bosch (the FoMoCo plug) are standard plugs.

Personally I'd use Denso Nickel TwinTip - TV16TT

Ford OE Number: 1787829

Bosch: 0 242 236 633 (HR7 MEV)

NGK: 4559 (TR5B-13)

Denso: T16VR-U10

Above are all STANDARD plugs. Below are uprated plugs:

Denso: TV16TT -Nickel TwinTip

Denso: ITV16TT - iridium TwinTip

The Ford service interval of 37,500miles/3yrs is daft for standard plugs. If using standard then renew every 20,000miles at least. iridium is fine for 30,000miles

[BavarianCare]

A final thing.

The reason NGK may cause issues is that they have a 1.3mm gap - if the engine/ignition system is not running 100% you may have slight misfires. But, if not, the engine will be slightly more economical (teeny tiny amount)

OE Ford/Bosch have 1.2mm gap

Denso run 1.0mm gap and will last longer and be more reliable.