2003 Infiniti M45 Q&A

2003 Infiniti M45 Question: Knocking noise

For some reason or another there is a a LOUD knocking sound coming from my engine after starting it up on a cold days. It normally last for a few minutes until the vehicle is warmed up. I noticed that this only happens in the winter months when it's extremely cold outside. I drive a 2003 Infiniti M45. Please help! -
Answer 1
It could be piston slap (loose pistons resulting from overheating, usually) or a crankshaft bearing problem. It could be some other things too so get it checked by a Nissan or Infiniti specialist. Here's a directory link for you: http://repairpal.com/directory?address=37172&car_brand_names=Infiniti -
Answer 2
silly question, but you are using Premium Gas right? if not, I suggest you do. -
Answer 3
I have similar problems after cold cranking the car and moving it for a vary short distance and turning it off - next morning sounds like a rod bearing has gone bad - mechs indicate normal issue w/Nissan - Infiniti cars - wifes fx35 also does this. -