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-   -   Knock sensors for 502 mag mpi (https://www.offshoreonly.com/forums/general-q/322245-knock-sensors-502-mag-mpi.html)

Trash 01-28-2015 04:16 PM
Originally Posted by GMC271 (Post 4254322)
Try running 87 Octane, if you run 93 the ECM does not hear any knock so it believes that the knock sensor is defective and it will retard the timing.
That was on a limited run of 502 early build motors (early 95 and older if memory serves me correctly). Tech bulletin came out about this way back( 94-12).


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