this plug is from a 2.0 16v vauxhall c20xe engine
it had been running rough so i changed the plugs / cap and rota arm

plugs have always been black ish in colour

now the plugs look like this

what do you think ? good or bad?

try coulor tune you can buy them on ebay.

Hmmmm, it looks a bit lean and maybe burning a touch of oil?

NGK BCPR7ES i dont recall that heat range as standard with the vauxhall engine always had a 6 you could try a set of NGK BKR6E which is the iso of BCPR6ES or BKR6EK which are the twin electrode version of BKR6E

Looks OK but the fact it is a very different from the others suggests looking a little deeper.

What fueling system are you using ? -- vacuum leak
Is the engine losing any water ? --- head gasket
How are the compression pressures ? --- exhaust valve not seating/burnt

[Edited on 11/3/07 by britishtrident]

all 4 plugs are the same colour
i have twin 45 delortos

have you had your carbs setup ??????its over heated if you have hada your carbs setup use a diffent grade plug



[Edited on 11/3/07 by oadamo]

the carbs where jetted 2 years ago so no resent change

If it is the same colour as the other 3 no problem
The plug has no signs of being overheated.

These days plug colour dosen't give as much info as it used to because of differences in fuel and the fact we all run weaker mixtures than twenty years back.