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the Tacho signal is not optionad why.
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Description: the suppressor must not be missing.
or spark goes weak and for sure injection stops.
1991 here, 8valve 56Bxx ecu.
the ecu creates all spark, via CMP inputs.
DTC code 41 or 42 kills spark then fuel.

this is real scope data, via my prime grade scopes.
the EMF is real !!
A1 is the brown wire, tacho, to speedo ECU and to cruise, the brown wire must never go dead.
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Posted by: fixkick 11-02-2020


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