Weird Noise from Engine

[XAkira]

Hi, I have a weird noise coming from engine and I can’t seem to figure out what it is. I’ve tried alternator change, spark plugs, I’ve done timing belt, water pump, thermostat and serpentine belt. Any input on what this noise is would be helpful.

https://youtube.com/shorts/h4uuh2BVt-o?si=qB4DB1aQ2OH3cCi0

 

[Handy Andy]

Are you talking about that low-rumble beyond the usual cam/tappet noise?

Either exhaust gasket or noisy throw-out/roller bearing - didn't say if yours was an Auto and Manual. So since you're on the crank pulley side, I'd look into exhaust onto a bad motor mount making the rumble from the vibration.

To help determine if it's the motor mount - try pushing/pulling on the motor carefully - rocking it to see in the noise changes tone and loudness. If it goes away, the issue is most likely a motor mount or loose hardware for it.

 

[XAkira]

Ok. I will give rocking it a try. Also, it’s a manual, this is my first post and forgot to mention it. Thanks.

 

[Handy Andy]

Oh your good, because if the manual side (transmission side) has a noisy bearing - the "echo" can show up thru the length of that crankshaft - and you hear it louder thru the open pulley side versus the covered housing the bearing rolls in.

You might need to get under the car while it's running to check and verify the source of that noise.

 

[XAkira]

I also forgot to mention this noise only happens at idle or when the car is moving I can’t hear it due to regular engine noise.

 

[Handy Andy]

That rumble seems to be a type of resonance - so it can can be from the motor mounts or the exhaust and it's hangers, so try to get some time to reproduce the noise and try to pin down the location and source of the noise. At idle - try to get under the passenger side and see up towards the exhaust manifold - watch for moving engine parts ok!? - it might be from an exhaust hanger that is weak and makes the rumble, at least listen for it and smell the air - does it have an exhaust odor like raw exhaust? Then a seal and the springs used to keep the seal are weak. So that would means a loose exhaust system - but it would also rattle and clunk as the vehicle shifted up and down as you adjusted speed and the transmission placed torque on the motor end engine mounts. (Trying to keep you thinking of all the other options not mentioned yet, as to that source of noise)