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Cyclinder 4 Help!

Hi guys, having problem with No 4 cylinder. I found last week a knackered injector on no 4, replaced all working fine took for a spin after getting home switched off thinking all was ok. But when i came to start the car again found cylinder no4 down again. Since then Ive:-

 

Changed the spark plugs.

New coil pack fitted.

Cylinders 2 & 4 coil packs checked against each other on top of the plenum both sparks the same.

Checked injector again hear a clicking sound. injector working.

Changed coil packs over from 4 to 1.

Checked ECU Signal to injector.

Changed ECU.

 

Just taken all 6 spark plugs out of the engine and all of the spark plugs apart from No 4 are darkish, No4 like new.

 

Any Help what to check for?

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    R u going to Japfest Baz?

    Im not getting to Japfest till 8.30ish. it will be nice to see everone again!

     

    No plans to mate, couldn't even tell you when it is lol. Currently zedless so JAE is the target I've set myself :)

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    Whats happened to the one u had?

     

    Typical UK spec rust problems and it sacrificed itself in the name of finance :(

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