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Knock/rattle when warm

Tiny
350Z2004
  • MEMBER
  • 2004 NISSAN 350Z
  • 3.5L
  • V6
  • 2WD
  • MANUAL
  • 81,000 MILES
My car has a knock/rattle when warm. You cannot hear it when it is cold. It seems to be coming from the drivers side of engine near the pan or catalytic converter. No loss of power or codes. I have maintained the car very well. But the noise is quite noticeable when warm.
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Thursday, May 3rd, 2018 AT 6:17 PM

4 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi and thanks for using 2carpros.com. A common problem is the catalytic converter. Although it may appear in good condition, there is a chance that the internal components have come loose and it is rattling inside.

Here is a video which explains how to check the converter. Pay attention to the first couple still pictures. You will see an inside which has come loose. Follow the directions and see if that is the problem.

Here is the video:

https://youtu.be/kNXh1Lphzr4

Also, I have attached a picture of what may be the issue.

I hope this helps you.

Take care,
Joe
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Saturday, May 5th, 2018 AT 7:44 PM
Tiny
350Z2004
  • MEMBER
  • 3 POSTS
Would this happen only when warm and at idle? P.S. Thanks for the reply.
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Saturday, May 5th, 2018 AT 8:11 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Hi again. Honestly, it is very possible. I would take something like a rubber mallet and tap on the system to see if you can recreate the noise.
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Saturday, May 5th, 2018 AT 8:33 PM
Tiny
350Z2004
  • MEMBER
  • 3 POSTS
Thanks.
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Saturday, May 5th, 2018 AT 8:43 PM

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