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Excessive exhaust crackling in idle?

Hi guys, Here is what my car sounds like in idle when fully warmed up (after a 40 minute drive). Is it normal for the exhaust to crackle this much?

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Old 08-25-2021, 04:17 PM   #1 (permalink)
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Default Excessive exhaust crackling in idle?

Hi guys,

Here is what my car sounds like in idle when fully warmed up (after a 40 minute drive).

Is it normal for the exhaust to crackle this much? The crackles go away if I give it a little bit of gas, which presumably causes the exhaust to warm up a little for a short while. Then after a few seconds the crackling starts again.


http://www.youtube.com/watch?v=64RkuV_tUTo
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Old 08-25-2021, 05:45 PM   #2 (permalink)
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I'm going to take a guess and say that's a blown catalytic converter or resonator. No way for me to tell 100% unfortunately.
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Old 08-25-2021, 05:56 PM   #3 (permalink)
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Quote:
Originally Posted by abm89 View Post
I'm going to take a guess and say that's a blown catalytic converter or resonator. No way for me to tell 100% unfortunately.
I should probably add, that this ticking noise only happens once the car has warmed up. So it's clearly related to heat. It's the same noise that the exhaust makes when you turn off the car and the exhaust makes a ticking noise when cooling down. But my car makes a lot of these ticking sounds when it's warmed up and idling. As I said, as soon as I give it a bit of gas or when driving the ticking is not there. Just when idling after the exhaust has warmed up.

I would imagine that a bad catalytic converter or resonator would cause issues all the time, especially when driving/revving the car and not just in idle once the car is warm?
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Old 08-25-2021, 07:20 PM   #4 (permalink)
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No engine codes? Any stumbles while driving?
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Old 08-25-2021, 07:22 PM   #5 (permalink)
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Originally Posted by CeeCab705 View Post
No engine codes? Any stumbles while driving?
Nope, no codes and the car drives fine and sounds fine as well.
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Old 08-25-2021, 10:58 PM   #6 (permalink)
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Quote:
Originally Posted by tibor370 View Post
Nope, no codes and the car drives fine and sounds fine as well.
Did you do anything to the exhaust recently?
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Old 08-26-2021, 05:50 PM   #7 (permalink)
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Quote:
Originally Posted by CeeCab705 View Post
Did you do anything to the exhaust recently?
Nope, the car is completely stock.

Would be nice to get some replies from other owners confirming whether their cars make these ticking noises when idling (once fully warmed up) or not. That's all I need to know. If it's not a normal sound for the 370z to make when idling, I'm just going to take it to the shop to have the problem diagnosed.

Last edited by tibor370; 08-26-2021 at 08:03 PM.
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Old 08-26-2021, 06:55 PM   #8 (permalink)
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Mine definitely used to tick after warmup. But probably not quite that much. No clue if it's still doing it. I've gotten rid of the cats and exhaust but with the new pipes, I wouldn't be able to hear it at all.
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Old 08-26-2021, 09:30 PM   #9 (permalink)
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Wish I could help but mine stopped doing that once I had put a few thousand miles on the new exhaust. I know it did it when cooling down but dont remember if it did it while idling.
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Old 08-27-2021, 05:06 AM   #10 (permalink)
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I agree that it's not a normal sound. My '11 has aftermarket exhaust and when it had stock exhaust, I don't recall it made that kind of noise.
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Old 08-27-2021, 07:44 AM   #11 (permalink)
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Could possibly be a failing gasket allowing an exhaust leak.
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Old 07-20-2022, 12:48 PM   #12 (permalink)
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My Stock 2009 370Z With 51K miles Does this exact thing, I'm not sure If you found a solution but mine does crackle when it's warmed up and at idle like this. I've been concerned but no codes, drives great, so I'm not sure If its just a normal noise or something it's broken. Hoping someone has more insight on this
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Old 07-20-2022, 03:34 PM   #13 (permalink)
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My stock exhaust crackled very often and noticeable, I usually noticed it just after I turned the car off. With the new catback invidia gemini, it almost doesn't crackle at all. I suspect it's perfectly normal for stock exhaust.
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