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10-18-2019, 09:09 PM | #1 |
Junior Member
Join Date: Oct 2019
Location: Clovis, CA
Posts: 21
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Black spark plugs
1930 A My engine runs not too good. I pulled the spark plugs. Never saw plugs this bad. Black and thick as coal. Is it ignition or carb? I'm going to dig into it tomorrow.
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10-18-2019, 10:51 PM | #2 |
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Join Date: Aug 2012
Posts: 880
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Re: Black spark plugs
What plugs are you running? Could be too cold. How far is the GAV open? Start with some of the small things.
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The Master Cylinder Enjoying life at the beach in SoCal... |
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10-19-2019, 06:09 AM | #3 |
Senior Member
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Re: Black spark plugs
Just clean them and see how long it takes for them to foul again. Model A plugs need frequent cleaning. No big deal. Slow driving for a long time, a parade, running rich can all foul them.
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10-19-2019, 08:36 AM | #4 |
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Join Date: Feb 2013
Location: Coatesville, Pa
Posts: 719
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Re: Black spark plugs
Most likely you carburetor running too rich. Won't hurt to check the timing also. But make sure your GAV is closed and the choke plate is all the way open. Also be sure the plug heat range is right. Properly tuned a Model A should not foul plugs. I have never cleaned a spark plug in my A.
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10-19-2019, 11:41 AM | #5 |
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Join Date: May 2010
Location: Alabama
Posts: 8,099
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Re: Black spark plugs
If the spark is weak it can cause those problems .
I would first check the gaps at the rotor tip . Be sure to check ALL four contacts in the distributor cap body , while you are at it . Ford recommended a conservitive gap of twenty five thousands . I run mine with a thirty five thousands gap at the rotor tip for a hotter spark at the spark plugs . Back in the day , poor people would cut the plug wires and connect an old button between the two halves of the cut wire . This operation gave a gap where the spark would jump across the button Spark gets hotter when it jumps a gap , to a point . Increasing the gap at the rotor has the same affect .. It doesn't need a fouled spark plug for more gap to increase spark . A wider gap at the rotor tip gives hotter spark . I like to also use a Pertronix flame thrower coil for hotter spark . . Believe it or not , I can feel the power that the Flame thrower coil gives . My spark plugs run clean … |
10-19-2019, 07:51 PM | #6 |
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Join Date: Oct 2019
Location: Clovis, CA
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Re: Black spark plugs
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10-19-2019, 09:23 PM | #7 |
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Join Date: Dec 2014
Location: Shawnee, Ok
Posts: 3,471
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Re: Black spark plugs
Thought my plugs were acting funny...this is what I found
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Keith Shawnee OK '31 SW 160-B |
10-19-2019, 09:25 PM | #8 |
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Join Date: Dec 2014
Location: Shawnee, Ok
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Re: Black spark plugs
I had the same type of plug problem last Christmas...
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Keith Shawnee OK '31 SW 160-B |
10-20-2019, 11:27 AM | #9 |
Junior Member
Join Date: Oct 2019
Location: Clovis, CA
Posts: 21
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Re: Black spark plugs
Don't send them over here!:eek
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