Peugeot 406 no 1 and 4 plugs are always black while the 2 and plugs always is black too and fuel in it....

Car: Peugeot 406
Variant: 1.8 turbo 8v
Model Year: 1999

The 1 and 4 plugs has black carbon in it always and the 2 and 3 plugs has also black carbon and unburned fuel in it mouth..
I've checked the coil and it's ok..

Posted: Jan 10, 2021 (3 years ago)

Collins

Points: 1

Tried replacing the plugs checking the leads,is the car running rough,may need a few bits and emissions check tune up

Posted Jan 10, 2021 (3 years ago)

bustedknuckles

Points: 2,304

Could be valve stems/ oil seals worn or engine wear , check compressions

Posted Jan 10, 2021 (3 years ago)

whittingehame

Points: 38,704

I found out that my head gasket between 2 and 3 plugs just melted...
So I changed it and everything came back to normal...
Thank you guys for the response..

Posted Jan 12, 2021 (3 years ago)

Collins

Points: 1

Thanks for updating the forum , glad you got it fixed .

Posted Jan 12, 2021 (3 years ago)

whittingehame

Points: 38,704

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Peugeot 406 no 1 and 4 plugs are always black while the 2 and plugs always is black too and fuel in it....

More problems with the 1999 model year Peugeot 406