The Ford Barn

old31 · 04-28-2026, 02:22 PM

I am interested in knowing what you think of this leak down test.

The other day I went for about an hour ride at the end of the ride the car really started running ratty. When I got home, I pulled all the plugs. Number one and two plugs were very fouled and oily. Number three and 4 had a nice tan color.

I am concerned as to what caused #one and two plugs to go bad.

Most of the cylinders I could hear air in the crankcase, not the exhaust, or carb or radiator.

Compression Leak Down
1 90 Lbs 32%
2 115Lbs 32%
3 110 Lbs 8%
4 110 Lbs 32%

04-28-2026, 02:22 PM	#1
old31 Senior Member Join Date: Jan 2016 Posts: 2,686	Leak down test and a compression test I am interested in knowing what you think of this leak down test. The other day I went for about an hour ride at the end of the ride the car really started running ratty. When I got home, I pulled all the plugs. Number one and two plugs were very fouled and oily. Number three and 4 had a nice tan color. I am concerned as to what caused #one and two plugs to go bad. Most of the cylinders I could hear air in the crankcase, not the exhaust, or carb or radiator. Compression Leak Down 1 90 Lbs 32% 2 115Lbs 32% 3 110 Lbs 8% 4 110 Lbs 32% Last edited by old31; 04-28-2026 at 02:34 PM.