Unfortunately the signal conditioner in the map sensor box is prone to failure after many heat cycles. They are generally repairable though. Also the wiring from it to the ECU could be non-functional but that can be tested just by removing the map box and connecting a 1.5v battery to the knock & gnd wires (battery minus to gnd) and observing the knock level on the keypad.
On Wed, Sep 21, 2011 at 6:55 AM, Kyle Lewis <[email protected]> wrote: > I have an FMII setup on my 91 > miata with the link ECU. The knock reading quit working and I am trying to > find the issue. **** > > So far, I have:**** > > Replaced the knock sensor with a new sensor for a Saab (supposed to be a > direct replacement)**** > > Replaced the RCA cable going from the knock sensor to the Link box**** > > Checked the resistance between the wire connections in the diagnostics box > under the hood (that the knock sensor taps into) back to the end of the RCA > harness to make sure I don’t have any breaks in the wires.**** > > ** ** > > I am hoping to have the knock sensor working by the weekend so I can run it > at the strip a few times and hopefully surprise a few people. I just don’t > want to take the chance of running it without the knock sensor and damaging > the engine.**** > > ** ** > > Any help would be greatly appreciated.**** > > Thank you,**** > > Kyle**** > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > >
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