302 mis-firing, spark plug wet with Gasoline...

myname182 · 06-12-2001, 08:39 PM

Yesterday,
My 68' 302, started mis-firing. It shakes alot and wont pick up speed. I checked the wires and their fine. I checked the spark plugs and i replaced the 1st on because it was burned out bad (the only one burned). The started runing fine, but the it started doing the same thing. I check the same plug and it was wet, and it smelled like gasoline. I dried it off and put it back. The car ran fine again, but the started acting up again...help.

mustangII460 · 06-12-2001, 11:19 PM

Sounds like a bad valve.

Test cylinder compression.

Take out your #1 plug and dry compression check, note your pressure.

Next,do the same thing but squirt in a small amount of oil.

If your pressure increases your rings are bad.

If the pressure stays the same, oil or no oil, you have a bad valve or head problem.

Hope this helps.

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06-12-2001, 08:39 PM	#1
myname182 Registered Member Join Date: May 2001 Location: West Covina, CA, USA Posts: 4	302 mis-firing, spark plug wet with Gasoline... Yesterday, My 68' 302, started mis-firing. It shakes alot and wont pick up speed. I checked the wires and their fine. I checked the spark plugs and i replaced the 1st on because it was burned out bad (the only one burned). The started runing fine, but the it started doing the same thing. I check the same plug and it was wet, and it smelled like gasoline. I dried it off and put it back. The car ran fine again, but the started acting up again...help.

06-12-2001, 11:19 PM	#2
mustangII460 Factoy Five Roadster Join Date: May 2000 Location: Sevier Co,Tennessee Posts: 1,681	Sounds like a bad valve. Test cylinder compression. Take out your #1 plug and dry compression check, note your pressure. Next,do the same thing but squirt in a small amount of oil. If your pressure increases your rings are bad. If the pressure stays the same, oil or no oil, you have a bad valve or head problem. Hope this helps.