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2003 Infiniti M45 Question: Knocking noise



Laronb, Springfield, TN, December 28, 2010, 07:02

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!

3 Answers
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  • Answer #1

    Superbob December 28, 2010, 12:26

    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:

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  • Answer #2

    Visitor, May 07, 2011, 20:43

    silly question, but you are using Premium Gas right? if not, I suggest you do.

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  • Answer #3

    danb99 October 02, 2011, 07:13

    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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