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Knocking noise
2003 Infiniti M45

Knocking noise

(2003 Infiniti M45)
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!
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Popular Answer
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/infiniti-repair-in-springfield-tennessee
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General Diagnosis
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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/infiniti-repair-in-springfield-tennessee
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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.
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silly question, but you are using Premium Gas right? if not, I suggest you do.
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