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!
Knocking noise on 2003 Infiniti M45
by Laronb in Springfield, TN on December 28, 2010
ANSWER by Superbob on December 28, 2010
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 by Visitor on May 07, 2011
silly question, but you are using Premium Gas right? if not, I suggest you do.
ANSWER by danb99 on October 02, 2011
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.