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Old 08-09-2017, 09:07 AM   #26
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Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,676
Re: HELP PLEASE! Engine Trouble

It's not always that excessive fuel will ruin a spark plug but it may cause misfiring. My guess is the fouling causes the spark to jump the gap to ground. In most cases where the spark plug is new and clean it can be dried out an reused, however, the cause of the fouling has to be eliminated first.

If the spark plug already has oil or carbon buildup on top of the fuel soaking, it's best to replace them.



Will occur when spark plug tip temperature is insufficient to burn off carbon, fuel, oil or other deposits
Will cause spark to leach to metal spark across plug gap will cause a misfire
Wet-fouled spark plugs must be changed...spark plugs will not fire.
68 GMC 250/3 speed Saginaw p/b p/s
69 Chevy 350/350 currently in pieces still lookin for a cab
06 Trailblazer
And the workhorse: Massey Ferguson 135 three cylinder Perkins diesel.
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Old 08-10-2017, 09:33 PM   #27
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Join Date: May 2016
Location: Henderson NC
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Re: HELP PLEASE! Engine Trouble

Originally Posted by saxart View Post
I'm confused... How does gasoline soaking spark plugs "ruin" them?
I don't know what causes it but I have seen cars that wouldn't start after flooding even after sitting for a couple days. Change the plugs and they fire right up and run normal. I had an old mechanic friend to show me this when I was a teenager and I didn't believe either until I saw it.
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