A poorly 986....

[thstone]

Do the compression test first before replacing anything. I bet you'll find the results interesting...

(lots of smoke + missing/rough running + oil in the exhaust ports = usually not good things)

[Listerofsmeg]

Absolutely spot on, there is zero compression im cylinder 1, 12.5-13bar in all other 5. In other cars that would normally suggest a hole in a piston....damn....

Originally Posted by thstone

Do the compression test first before replacing anything. I bet you'll find the results interesting...

(lots of smoke + missing/rough running + oil in the exhaust ports = usually not good things)

[shadrach74]

Originally Posted by Listerofsmeg

Absolutely spot on, there is zero compression im cylinder 1, 12.5-13bar in all other 5. In other cars that would normally suggest a hole in a piston....damn....

Or a burnt valve or a broken valve spring... Any way you look at it, the head is likely coming off that bank at the very least. Next step boroscope.

thstone is right about a used engine. Far more cost effective than breaking yours down.