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> MPS tunning, Do my plugs seem to lean
Ron914
post Mar 17 2026, 04:17 PM
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I have a 2056 and was advised I should tune my MPS for optimum performance .

I rebuilt it with CFR diaphragm kit so I could dial it in .

I have not tried to tune it yet and am wonder how my plugs look ?

I have to richen the mixture on the ECU to run well (CW).

I understand running lean will cause high heat , which could be part of my problem with high running temperatures .

They look on the rich side to me .

Plugs are in order 1-4 (#3) does not have the number on it.
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rjames
post Mar 17 2026, 04:42 PM
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What Worn said. You'll need a wideband AFR kit to properly tun it.
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