boggy2006
20th March 2011, 04:43 PM
hi all,
I've had a mystery noise coming from my GQ on and off since a couple of months after I bought it. It really is quite strange, there's a bit of a story to it and I'm not 100% sure if it's been the same noise all along or something different each time!
After a month or so, I got a whining noise from around the engine area and I noticed the power steering fluid was low, there was a small leak from one of the lines, so I fixed it, topped it up and all was ok for about 1 week. Then the same, or a very similar noise came back, so I thought it was the ps pump which was knackered. It was pretty much a continuous whining noise. However the noise did not appear to be coming from near the pump, so I took the pump belt off and the whining noise was still there. It varied with engine revs and appeared to be coming from the auto trans. I noticed the fluid was over full so I dropped the level down and the noise almost went away. I then change the trans fuild with Nissan d-matic and the noise went completely. However about 2 months later the/a noise came back. Initially I thought is was the same noise, but this time it's more of a gear noise, like the noise of an RC car plastic gearbox, but louder, like a buzzy-zingy noise (if you can imagine!). Now, it's there for a few seconds when the engine is started first thing in the morning then goes away. It comes back after about 30mins of driving when everything is hot. It's most noticeable between 1800-3000rpm and occurs in any gear or neutral/park. I still think it's the auto trans because when I increase the oil level it gets worse. If I drop the trans oil level, it gets better, in fact it nearly goes away when the level is dropped below the minimum on the dip stick! Even more strange, it gets worse on left hand bends!! Yep, even the slightest left bend or when the car is tilted to the right (same g-force effect) it's there continuously. But on right bends, or tilted to the left, it goes away.
The fact that a lower fluid level makes less noise, taking a left bend (hence shifting the oil level to the right) makes it worse and cold start up makes it worse (as the oil level in the sump of the gear box will be higher until it's distributed around the box), is making me think that it's something in the gearbox on the right hand side, getting noisy when cover in oil....unusual to say the least.
Any ideas at all what this crazy problem could be?
Thanks
I've had a mystery noise coming from my GQ on and off since a couple of months after I bought it. It really is quite strange, there's a bit of a story to it and I'm not 100% sure if it's been the same noise all along or something different each time!
After a month or so, I got a whining noise from around the engine area and I noticed the power steering fluid was low, there was a small leak from one of the lines, so I fixed it, topped it up and all was ok for about 1 week. Then the same, or a very similar noise came back, so I thought it was the ps pump which was knackered. It was pretty much a continuous whining noise. However the noise did not appear to be coming from near the pump, so I took the pump belt off and the whining noise was still there. It varied with engine revs and appeared to be coming from the auto trans. I noticed the fluid was over full so I dropped the level down and the noise almost went away. I then change the trans fuild with Nissan d-matic and the noise went completely. However about 2 months later the/a noise came back. Initially I thought is was the same noise, but this time it's more of a gear noise, like the noise of an RC car plastic gearbox, but louder, like a buzzy-zingy noise (if you can imagine!). Now, it's there for a few seconds when the engine is started first thing in the morning then goes away. It comes back after about 30mins of driving when everything is hot. It's most noticeable between 1800-3000rpm and occurs in any gear or neutral/park. I still think it's the auto trans because when I increase the oil level it gets worse. If I drop the trans oil level, it gets better, in fact it nearly goes away when the level is dropped below the minimum on the dip stick! Even more strange, it gets worse on left hand bends!! Yep, even the slightest left bend or when the car is tilted to the right (same g-force effect) it's there continuously. But on right bends, or tilted to the left, it goes away.
The fact that a lower fluid level makes less noise, taking a left bend (hence shifting the oil level to the right) makes it worse and cold start up makes it worse (as the oil level in the sump of the gear box will be higher until it's distributed around the box), is making me think that it's something in the gearbox on the right hand side, getting noisy when cover in oil....unusual to say the least.
Any ideas at all what this crazy problem could be?
Thanks