Not all oil filters have an anti-drainback valve. The ones that do, can cook the silicone rubber so that it leaks--which is effectively not having an anti-drainback valve.
I would not expect piston slap to be "done" with three knocks. Fifteen or thirty seconds...maybe.
Similarly, a lifter bleeding-down overnight might "knock" or "tap" upon startup...but probably longer than three knocks and then silence.
Same deal for a cracked flexplate. Don't know why that would knock three times on startup, then never until the engine cools off again.
Off-chance that this is ignition-timing related due to a failure somewhere in the electronic timing circuitry, during the change in timing authority between the ignition module and the computer...but it'll be tough to track down.
If this thing is knocking three times on the ceiling, maybe it wants you.
I would not expect piston slap to be "done" with three knocks. Fifteen or thirty seconds...maybe.
Similarly, a lifter bleeding-down overnight might "knock" or "tap" upon startup...but probably longer than three knocks and then silence.
Same deal for a cracked flexplate. Don't know why that would knock three times on startup, then never until the engine cools off again.
Off-chance that this is ignition-timing related due to a failure somewhere in the electronic timing circuitry, during the change in timing authority between the ignition module and the computer...but it'll be tough to track down.
If this thing is knocking three times on the ceiling, maybe it wants you.
xc_hide_links_from_guests_guests_error_hide_media