Mazda 6 knocks hard when run cold.?

fantabular

New member
When we 1st start our Mazda 6, it knocks very hard in 1st and 2nd gear. It does this mostly when it's cold out & it hasn't been warmed up.
It sounds like the engine mounts are busted or something.

Anybody else experience this w/ their Mazda?
And it knocks so hard, it literally sounds like someone is banging away on the engine with a jackhammer...I'm not exaggerating. =(
Now that some people have mentioned crankshaft stuff, I also noticed that the engine light is on. The code given is something about the "crankshaft sensor"...
 
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