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philosofriend · 04-28-2026, 04:58 PM

Could be quite a few things. Is your oil filler letting blow by gases out freely? Or is it clogged by a defective cap or metal pads jammed in it? Having pressurized crankcase is not good.

The rings could be sticking. The oil could need changing. The auto parts stores have "miracle" additives claiming to free sticky rings.

The distributor cam could be worn so that it is not opening normally for #1 and 2. Check to see if all four lobes are opening the points the same correct amount.

Look inside the distributer cap for carbon tracks running to the contacts for # 1 and 2.

The guides for the intake valves could be worn allowing oil to get sucked into the cylinders.

The two spark plugs could have had a colder heat range than the others.

The intake manifold runner for 1 and 2 could have a vacuum leak causing intermittent firing, not enough heat to burn the oil off.

04-28-2026, 04:58 PM	#2
philosofriend Member Join Date: May 2025 Posts: 37	Re: Leak down test and a compression test Could be quite a few things. Is your oil filler letting blow by gases out freely? Or is it clogged by a defective cap or metal pads jammed in it? Having pressurized crankcase is not good. The rings could be sticking. The oil could need changing. The auto parts stores have "miracle" additives claiming to free sticky rings. The distributor cam could be worn so that it is not opening normally for #1 and 2. Check to see if all four lobes are opening the points the same correct amount. Look inside the distributer cap for carbon tracks running to the contacts for # 1 and 2. The guides for the intake valves could be worn allowing oil to get sucked into the cylinders. The two spark plugs could have had a colder heat range than the others. The intake manifold runner for 1 and 2 could have a vacuum leak causing intermittent firing, not enough heat to burn the oil off. Last edited by philosofriend; 04-28-2026 at 06:10 PM.