Wierd/aggrivating buzzing noise

[kefferjoe]

So there is this medium pitched buzzing noise coming from somewhere in the back of my 86 300zx when it is running I recently snapped the belt on the power antenna and was thinking that could be it but I don't think so seeing as the noise is not able to be heard from inside the car but only the outside by the rear bumper

[evildky]

fuel pump?

[kefferjoe]

maybe but my car seems to run just fine so I didn't think hat was a possibility right??

[evildky]

the fuel pump makes noise when it works, when the fuel level si low it's luder and supposedly as they start to wear out the get louder before they give out

[kefferjoe]

well it also makes the same noise when the car is on the on position buy not running

[evildky]

the fuel cump comes on int he on position before you turn the key to start and then stays on when the key returns to the on position

there are only 2 moving electricat parts behind the driver, one is the antenna the other is the fuel pump, if somethign is makign a buzzing noise it's one of them

[Conspirator05]

I've been getting a strange buzzing noise on my 85 as well, ever since I bought it. It seemed to have gone away but i still kind'a hear it from time to time. However, mine I think is coming from the front right corner, and thinking it could be the air shocks or something having issues. When I switch my suspension to soft or stiff(my mind's blanking on the name of this position), anything that isn't "normal", the letters blink meaning something's wrong. So I'm thinking, atleast for me, it might be the shocks/struts.You said you think it might be the antenna? Is it working?

[evildky]

I've been getting a strange buzzing noise on my 85 as well, ever since I bought it. It seemed to have gone away but i still kind'a hear it from time to time. However, mine I think is coming from the front right corner, and thinking it could be the air shocks or something having issues. When I switch my suspension to soft or stiff(my mind's blanking on the name of this position), anything that isn't "normal", the letters blink meaning something's wrong. So I'm thinking, atleast for me, it might be the shocks/struts.You said you think it might be the antenna? Is it working?

you don't have air shocks, they are eletronically actuated valves nto air

yu buzzing up front is likely the vac pump, on turbo's the put vac pumps to keep the vac operated systems like heat workign under boost conditions

[BadQ45t]

If you have a 1985 Z Turbo with the electric shocks, they are SHOT, trust me after 24 years they history. Most of them folks with those had them go out 15 years ago. You can either pay a s@#$ load of money and rebuild those or buy a set of Tokiko Illumima with the retro fit kit to dismantle that out. Trust me if your still on original shocks, they are toast. What your hearing is the shocks system dying You may be last 85' Turbo left on those original systems in the world, they were really only good for 60k or 7 years and they died.

So buzzing noises, there are a few things that will buzz. The rear is the fuel pump or the antenna, those are the only thing it can be, period. the pump can be loud for years before it fails. Inside the car there are two fans that are part of the automatic A/C package. once is down below and the other up top by the map lights. I have replaced that one next to the map lights 2-3 times in 25 years of ownership. It is a little fan motor and can get clogged up with dust and eventually burns out.

Under the hood vacuum leaks are the #1.