engine miss

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Apr 2, 2004 | 08:13 PM

fmc400

Thread Starter

MSEE

Joined: Apr 2004

Posts: 10,386

Likes: 35

From: Austin, TX

engine miss

Hi all,

I've got a '73 400M, feels like it has a miss, ran a compression test...7 of them came out fine but #1 has zero compression. the cylinder gets a spark...what could the problem be? maybe a burnt exhaust valve? i notice a light valve tap when the engine's been ran a while, wondered if that had anything to do with it too.

thanks

Apr 2, 2004 | 08:41 PM

danlee

Postmaster

Joined: Aug 2001

Posts: 4,270

Likes: 5

From: Delaware

Even a burnt valve will give you some compression. I would remove the valve cover on that side, pull the coil wire so it doesn't start and crank it over to see if all the valves are moving.

Chances are you will have to pull the head no matter what, but you may see something that can be fixed without doing that.