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Old 09-27-2020, 03:24 PM   #5
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Join Date: Jul 2011
Location: Redondo Beach, CA
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Default Re: Mystery missfire .

Originally Posted by john charlton View Post
Found no. 4 was not firing. Checked the plug it was oily so had not been firing .
Is #4 oil fowling? Could be BO oil control ring in #4. Compression test will not show bad oil rings.Try a hotter plug in #4.

Also check distributor body for 'carbon tracking' around #4 pin, inside and out. Any carbon tracking is a direct path to ground, causing it to miss.
'30 Briggs Town Sedan
'55 Ford Ranchwagon
And once again that is just my 1 worth.

Last edited by Y-Blockhead; 09-27-2020 at 03:55 PM.
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