Compression Loss -- Cause

[Stephen Bigelow]

Loose/broken spark plug.

> I was thinking about the possible causes of lower compression readings in
a
> cylinder and came up with the following.  I will list from what I guess to
> be the most to least common.  I would love to know what other causes there
> might be or what changes should be made to the order.
>
> 1. Worn Rings
> 2. Worn Valve guides
> 3. Worn Cylinder Walls
> 4. Worn Valves
> 5. Leaking Head gasket
> 6. Worn Valve Seats
> 7. Cracked Head
> 8. Cracked Block
>
>