[crushers]

so i have had a reoccuring problem at very cold tempuratures. i have a turbo diesel 2.7 that knocks very badly when the outside tempurature is below -15C. if the temp is above that then there is no knock at all.
when it is knocking there is:
no loss in power.
it is rpm related.
the engine will not blow hot air (although it will cook you out of the cab above -15C)

my guess is probably a fuel knock. any other guesses or suggestions?

cheers