Knock/rattle when warm

2004 NISSAN 350Z
81,000 MILES • 3.5L • V6 • 2WD • MANUAL
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350Z2004
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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.
May 3, 2018 at 11:17 AM
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JACOBANDNICKOLAS
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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
Image (Click to enlarge)
Attached Media
May 5, 2018 at 12:44 PM
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350Z2004
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Would this happen only when warm and at idle? P.S. Thanks for the reply.
May 5, 2018 at 1:11 PM
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JACOBANDNICKOLAS
  • ✓Experienced Mechanic
  • 110,248 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.
May 5, 2018 at 1:33 PM
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350Z2004
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Thanks.
May 5, 2018 at 1:43 PM
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