[Brock.te]

So, I have a 2006 350z roadster with almost 89k miles on it. It just started making this knocking sound when I accelerate from 1.5k - 4(ish)k it's in just about every gear and it gets worse as i go higher in rpms. I have a Borla Exhaust on it and thats the only modification done to it. I was trying to find an answer and couldn't seem to find a good one. Thanks for the help

-Brock

 

[dkmura]

Hmmm...your mileage isn't that high and the exhaust won't affect any type of detonation. Have you swapped fuel types (assuming you're using 91 octane)?

The VQ is a precision-built engine that isn't prone to detonation. But it can be damaged if the knocking continues. Have you pulled codes yet?

 

[Brock.te]

Hmmm...your mileage isn't that high and the exhaust won't affect any type of detonation. Have you swapped fuel types (assuming you're using 91 octane)?

The VQ is a precision-built engine that isn't prone to detonation. But it can be damaged if the knocking continues. Have you pulled codes yet?

No, i use 81 and I have yet to pull codes. I let the car sit 24 hours and checked oil, it was low so i added more, the oil was leaking out of the exhaust.

 

[Brock.te]

 

[dkmura]

If that's oil seeping from your y-pipe, you've got some serious issues. I'd start with a leakdown test to see if the valves are sealing properly. Let us know what you find.

 

[Brock.te]

If that's oil seeping from your y-pipe, you've got some serious issues. I'd start with a leakdown test to see if the valves are sealing properly. Let us know what you find.

What type of serious problems we talking about here? and Will do that was after starting the car for around 30 seconds

 

[dkmura]

If the fluid seeping from your exhaust is just water, then that's normal startup condensation. But if it's oil, it means oil is being burned in the combustion chamber and being sent through the exhaust. That could mean anything from a blown head gasket, to worn valve seals. But if that's the case, it likely means your VQ is worn and needs a rebuild.

 

[Brock.te]

If the fluid seeping from your exhaust is just water, then that's normal startup condensation. But if it's oil, it means oil is being burned in the combustion chamber and being sent through the exhaust. That could mean anything from a blown head gasket, to worn valve seals. But if that's the case, it likely means your VQ is worn and needs a rebuild.

well, it is oil i know that. i’ll get a video next time it gets started up.

 

[dkmura]

There's no way to tell what type of damage has been done to your engine via a video. You need to take it to an experienced Nissan tech or ASE mechanic and let them check it over. If you lived in my neighborhood, I could tell you more in 15 minutes by inspecting the Z directly, but if you think you can get better answers via a keyboard jockey, you're dreaming.