77 300D
Can anyone explain to me why my diesel knocks when first started on a cold morning and continues to knock when it is really cold out, even after water temp is up? I have had the fuel pump timing set and that helped considerably.
In the hot summer in Michigan, there is almost no knocking and pinging.
As soon as weather starts to cool, I am hearing what seems to be preignition knocks and pings.
Is this harmful to the engine and can it be stopped?
What do you guys think of adding a quart of the old style ATF trans fluid to fuel to keep diesel healthy?

Thanks,
Lad Guest