I've got a puzzling one:
My '91 Crown Vic 5.0 liter has a slight engine knock on deceleration from
This knocking only happens when the engine is warm and has run for a good 20
minutes or so. It doesn't knock at slow speed (low RPM) deceleration. And it
doesn't knock if I disconnect the SPOUT connector (when checking the
The timing is set to factory spec. and other than this, the engine runs very
Any idea what could be causing the knocking?