Whining noise from rear passenger...

whiterabbit · Apr 20, 2005

Hey everyone. I have a question. The other day, a semi-quiet whining noise started coming from the back passenger corner of my '94 300ZX (83K miles). It only seems to sound when I would put my foot on the accelerator and is slowly getting louder.

Is this my fuel pump? The car is still driving, but does this mean its going to give out soon? Any info would be greatly appreciated!!

Zen31ZR · Apr 21, 2005

Lemee move this to Z32, the guys there might know. I know the fuel pump is rising progressive pressure, at least on the turbo cars. That might be it. If you never heard this sound before, it could mean one of any number of things. Might mean the fuel filter is clogging up, the pump is working harder to push fuel out, and so making more noise. Might possibly be getting ready to go out, too.

whiterabbit · Apr 21, 2005

Thank you!!!!

Spongerider · Apr 21, 2005

whiterabbit said:
Hey everyone. I have a question. The other day, a semi-quiet whining noise started coming from the back passenger corner of my '94 300ZX (83K miles). It only seems to sound when I would put my foot on the accelerator and is slowly getting louder.

Is this my fuel pump? The car is still driving, but does this mean its going to give out soon? Any info would be greatly appreciated!!

If it was your fuel pump the noise would becoming from the drivers rear. It sound like your differintal bushing is going out or your low on gear oil. Lift the rear of your car up and look at the diff. If it's leaking you will see oil dripping from the diff.

Zen31ZR · Apr 21, 2005

Spongerider said:
If it was your fuel pump the noise would becoming from the drivers rear. It sound like your differintal bushing is going out or your low on gear oil. Lift the rear of your car up and look at the diff. If it's leaking you will see oil dripping from the diff.

The Z32 master speaks.

And now that I think about it, could be a wheel bearing or axle shaft noise as well. No point in not checking all that out.

JAMESZ · Apr 21, 2005

♣Zen31ZR♣ said:
could be a wheel bearing

I'm going to have to second this.

Bror Jace · Apr 22, 2005

Wheel bearing? This should be relatively easy to diagnose as it should make one wheel much warmer than the other.

Also check for sticking brakes ... a stuck caliper. Car may also be sluggish, be down on mileage and you should smell burning brake pads.

I'm also voting for something in the rear end. At the very least, check the oil level and top off if needed.

If you rule everything out and your rear-end is showing signs of excess wear, you might want to try a really heavy oil like Red Line 75W-140 or one of their "Shockproof" oils.

Nothing replaces a properly rebuilt rear end but a premium gear oil can make the best of a bad situation ... maybe buy you a little peace and quiet.

Specialty Formulations also makes heavy-duty differential fluids in different weights:

http://www.specialtyformulations.com/index_files/page1458.htm

jj300 · May 15, 2007

whiterabbit said:
Hey everyone. I have a question. The other day, a semi-quiet whining noise started coming from the back passenger corner of my '94 300ZX (83K miles). It only seems to sound when I would put my foot on the accelerator and is slowly getting louder.

Is this my fuel pump? The car is still driving, but does this mean its going to give out soon? Any info would be greatly appreciated!!

hello everyone...i have the same noise comming from behind the passenger seat of my 1993 na 300zx.It only makes noise when I press in the accelerator.The car can still be rolling with no noise but when I hit the gas there it is.3 days went by and then my car started running like a lawnmower.Sputtering badly and a huge lack of power acured.I think it might be a engine coil or my fuel pump.I DONT KNOW?

Spongerider · May 15, 2007

jj300 said:
hello everyone...i have the same noise comming from behind the passenger seat of my 1993 na 300zx.It only makes noise when I press in the accelerator.The car can still be rolling with no noise but when I hit the gas there it is.3 days went by and then my car started running like a lawnmower.Sputtering badly and a huge lack of power acured.I think it might be a engine coil or my fuel pump.I DONT KNOW?

Do a ecu diagnostics and see what codes come up. If you don't know how to do that go the 300zx forum and look for diagnostics on towards the top of the page.

Zen31ZR · May 16, 2007

Wheel bearing or differential. Check the fluid level in the diff. That's the easiest of the 2 choices.

As far as the driveability problem, Sponge has it nailed.

jj300 · May 16, 2007

Spongerider said:
Do a ecu diagnostics and see what codes come up. If you don't know how to do that go the 300zx forum and look for diagnostics on towards the top of the page.

Hey guys.Thanks for all the the help.Its greatly appreciated.Well I did the diagnostics test like you said and it was very easy espeicialy for a newbie.The reading told me it was a DETONATION SENSOR CIRCUT #34.Does anyone know where this is located.If so is this easy to replace or am I looking at lots of money.Any info will be appreciated.

Spongerider · May 16, 2007

jj300 said:
Hey guys.Thanks for all the the help.Its greatly appreciated.Well I did the diagnostics test like you said and it was very easy espeicialy for a newbie.The reading told me it was a DETONATION SENSOR CIRCUT #34.Does anyone know where this is located.If so is this easy to replace or am I looking at lots of money.Any info will be appreciated.

The DS is a pain to get to and most people would relocated the sensor or by pass it. If you are really anu about it you'll have to remove the heads to get to it.

jj300 · May 17, 2007

Spongerider said:
The DS is a pain to get to and most people would relocated the sensor or by pass it. If you are really anu about it you'll have to remove the heads to get to it.

What will I harm by doing the bypass.is it worth removing the block?..Thanks spongerider

Spongerider · May 17, 2007

jj300 said:
What will I harm by doing the bypass.is it worth removing the block?..Thanks spongerider

The only harm is destroying your motor if you are not listening for detonation or detonation deaf like me. :-(

Here is a link to help you bypass.
http://zhome.com/ZCMnL/PICS/detonationSensor/detonationSensor.html

apudapus · May 17, 2007

Spongerider said:
The DS is a pain to get to and most people would relocated the sensor or by pass it. If you are really anu about it you'll have to remove the heads to get to it.

i'm sure you mean remove timing belt and lower intake plenum.

Spongerider · May 17, 2007

apudapus said:
i'm sure you mean remove timing belt and lower intake plenum.

Isn't that part of the process? You are right.

mybabyZX · Jun 21, 2015

I have a 1990 300 ZX, I have this whining sound coming from behind the driver seat, changed to fuel pump but it still whining, can someone please give me some info on what it could be...it's driving me crazy!!

mybabyZX · Jun 21, 2015

I have a 1990 300 ZX, it has this whining sound coming from the rear drivers seat, changed fuel pump and it still making the same noise...can anyone give me some info on what it could be...it's driving me crazy..

Whining noise from rear passenger...

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