dead cylinder

[sir raymond]

2001 camaro. Started running really roughly, misfire code showed 300, multiple misfires.

Checked fuel pressure, spark, etc. all fine.

Did compression check and number 5 is totally dead, zero compression, all others are up to
normal specs. No water in oil or oil in radiator. What does anyone think? Head gasket or
stuck valve. HELP.

[Cool81z28]

Re: dead cylinder

Try squirting some oil into the cylinder through the spark plug hole and check the compression again. If it improves its the rings. If not, its probably a valve.

[LETZRIDE]

Re: dead cylinder

if you have no compression on one cylinder at all the valve is stuck open/burnt/bent

the cylinder beside it should be a little lower than the rest as well though...

[sir raymond]

Re: dead cylinder

Thanx, I'll see what I can find.

[sir raymond]

Re: dead cylinder

Looks like a broken valve spring