Help! 370z weird exhaust sounds

THE BULL · 08-08-2022, 02:03 PM

Quote:

Originally Posted by Corsairprime

Could also be that the AFR sensors in the exhaust track (the first ones) finally gave up. Mine quit around 110k Miles. If you run an OBD2 scanner program, you might see some anomalous readings on the AFR circuits. This is what I noticed and prompted me to replace them both.

Just a thought, but check your exhaust for leaks too.

Correct.

You should be able to monitor your A/Fs to find out if they are operating at all.
Going from a normal sound to a weird sound can be a leak, it can also mean that the cats are done and they messed up the A/Fs as they went.

With the cats clogged the A/Fs will take a beating many times overheating, you can monitor catalytic temp through the A/F sensors.

Any issues with these sensors will usually send the engine into default fuel parameters which mean pig rich airfuels.

I suggest you monitor the A/F readings then take off your exhaust and check those cats.

Dreadnaught · 08-08-2022, 11:04 PM

Once you get the car up in the air you could also check the cats by hitting them with a dead blow hammer and listen for the inside of the cat rattling around as you hit it.

fuentes2s · 08-11-2022, 05:25 PM

Quote:

Originally Posted by THE BULL

Correct.

You should be able to monitor your A/Fs to find out if they are operating at all.
Going from a normal sound to a weird sound can be a leak, it can also mean that the cats are done and they messed up the A/Fs as they went.

With the cats clogged the A/Fs will take a beating many times overheating, you can monitor catalytic temp through the A/F sensors.

Any issues with these sensors will usually send the engine into default fuel parameters which mean pig rich airfuels.

I suggest you monitor the A/F readings then take off your exhaust and check those cats.

Here are the A/F Sensors readings. Volts are low im assuming? Going to replace both upstream sensors

08-08-2022, 11:04 PM	#2 (permalink)
Dreadnaught Track Member Join Date: Dec 2009 Location: Farmington, Utah Posts: 582 Drives: 14 SR 370z 6MT Rep Power: 10141	Once you get the car up in the air you could also check the cats by hitting them with a dead blow hammer and listen for the inside of the cat rattling around as you hit it. Optimiser likes this. __________________ Ford Diesel and Heavy Line Technician at your service.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
370z exhaust weird noise	v6Nate	Nissan 370Z General Discussions	3	02-25-2021 01:02 PM
Weird metal sounds	SmallermouseZ	Nissan 370Z Warranty / Scheduled Maintenance / Servicing / Repairs	7	05-13-2012 11:02 PM
Exhaust sounds...	realneal370z	Intake/Exhaust	3	03-26-2011 04:40 AM
CD to DVD exhaust sounds	BOBz	Nissan 370Z General Discussions	17	04-08-2010 04:51 PM
Unknown exhaust for 370Z (sounds amazing)	AK370Z	Intake/Exhaust	28	12-23-2009 06:57 AM