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350Z engine strong knocking sound after revving

Old 04-25-2016, 07:08 PM
  #1  
Misaka_10032
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Default 350Z engine strong knocking sound after revving

Hi, I know I screwed up, but after revving very high after a cold start.

My engine started a strong knocking sound, it almost sounds like something fell off in a cylinder and is knocking the cylinder itself.

Here is a youtube link:

The noise goes up in frequency with rev, the idle rpm is still very stable, but the throttle response seems very very slow, and the car is clearly slower than normal.

Also, I had a grinding 3rd gear, but I do know if transmission is the problem here.

Please give me some thoughts,

Thank you very much!
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Old 04-25-2016, 07:14 PM
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turboed350z
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Thrown rod....


What else is new? Young immature 350z owner trashes another car...
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Old 04-25-2016, 07:19 PM
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Spike100
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That is a very bad sound. Your camshaft is ruined, and your valves are "toast."

You are looking at an engine rebuild or buying a rebuilt engine.
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Old 04-25-2016, 08:04 PM
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Motor is trashed
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Old 04-25-2016, 11:23 PM
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do a compression test.

report to us the compression readings.

drain the oil and remove the oil pan check for metal shavings.

then go from that information.

its hard to diagnose a car just by sound can be plenty of symptoms dont jump the gun until you get concrete facts.
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Old 04-26-2016, 12:08 AM
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tcode
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That's a rod knock 99.6%.


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Old 04-26-2016, 02:04 AM
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@Tcode I just cried laughing haha... ugh that was great.

@misaka "after revving very high after a cold start." this is like saying "after having sex with that prostitute I got aids." cold starting a car and reving it up is begging to throw something.
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Old 04-26-2016, 02:41 AM
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100% rod knock from spun bearing.
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Old 04-26-2016, 04:17 AM
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for a dead motor
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Old 04-26-2016, 06:28 PM
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So you high revved your car cold, how bout somebody shakes you from a deep sleep then you run a marathon. Doesnt sound like that would be fair way to treat you does it?
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Old 04-26-2016, 07:18 PM
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Its not cold unless your car tells you it's cold... Thats going to be an expensive mistake though... Can only do that with rental cars or something still under warranty.
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Old 04-28-2016, 05:17 AM
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the sound hes experiencing was something "kind of similiar" except mines was deeper sounding from the exhaust during the break in period of my engine. it turned out to be piston slap though not really a big deal only happened during cold startup and once the car got warm my sound went away.
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Old 04-28-2016, 05:28 PM
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Why in the hell would you rev the **** out of your car on a cold start?

Buuut... Start looking for a new engine. These meme's are killing me.
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Old 04-28-2016, 05:41 PM
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well then... here is more









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Old 01-27-2019, 09:09 AM
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Default Same Problem

Hi, I wanted to ask you if you've solved, I have the same problem
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Old 01-27-2019, 09:55 AM
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Originally Posted by Valdet HC View Post
Hi, I wanted to ask you if you've solved, I have the same problem
Valdet - load up a video with sound of your engine. Bent rod / spun bearing ...
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Old 01-27-2019, 11:25 AM
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@Valdet - The post is like 3 years old now so it’s unlikely you’ll get a reply but like Beal said just give us 30 secs of audio/video and we will take a look.
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Old 01-27-2019, 02:36 PM
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Default Video My engine

Originally Posted by bealljk View Post
Valdet - load up a video with sound of your engine. Bent rod / spun bearing ...
This my Videos
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