Quote:
Originally Posted by spearfish25
Cars Do strange things when it's cold. Mine has been making all kinds of new, creepy sounds since the temps drop and the salt trucks started rolling. Do yours a favor and don't keep starting it in the super cold weather...causes lots of wear as this is when the oil flow is the worst (oil=sludge at 20F)
|
+1, if you're not going to drive it until it get fully up to temp, don't start it.
High compression + cold engine can also = knock
Lack of oil getting to all the important places can also sound like knock...
My truck is a great example, first 1-2 seconds of start up when it's cold out = rattling engine, especially the valvetrain - sounds similar to cylinder knock. Once the oil hits it with pressure it goes away. Not a whole lot I can do about it either...just hope there's enough residual oil stuck to the parts...