Originally posted by kinger:
IIRC my 3L does not have a knock sensor but my original 2.5 did or vice versa I can't remember, I do remember being confused by it but not giving a flying foook just because it ran. Would be a nice saving grace if you could adjust sensitivity and have it dialed in, just scaring finding that perfect setting



Yes, your 3L does have a knock sensor. The 3L had one too, jsut a different size than what your factory 2.5L had. We (read I) drilled out the hole and retapped for the newer sensor.

The similarities from tuning my '86 Trans Am compared to the new OBD-II Ford ECU is amazing. Both have knock counts for retard, attack rate (how many dregrees timing is pulled), and recovery rate (how quickly it returns to normal spark after the knock retard).

Tuning is done by trial and error of adding/deleting spark along with fuel until maximum HP/TQ is reached at any one problematic RPM level. Once you add spark and fuel and neither makes any improvement, then you back off to your minimum ratio of spark/fuel at the maximum HP/TQ level (i.e. when adding fuel to quench spark knock no longer adds HP/TQ). Simple.

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