hmmm noise from rear of engine???

[Guest]

hi guys
i just discovered a hmmm noise from rear of engine, sounds to me like some sort of pump or sopmething as it gets louder with the revs..
when it gets warm it does it then somethimes it doesnt do it at all..

i have ruled out the water and power steering pumps as the car has full steering and there is no noise cooming from that pump and i have ruled out the water pump as the car is not over heating..
i was thinking could it be the oil pump, b ut then you would see rises in temps aswell because the oil is not circulating..
maybe it could be rear turbo on its way out , but its not whiney just a lo pich hmmm sound..

thanks in advance cause any help would be great..
cheers joe

 

[bradc]

Can you hear it when driving at 100kmh steady? Does it get a heap louder when you roll your foot onto the throttle? If it goes up quite quickly in noise then I'd say turbo. If it slowly goes up with engine rpm, or you can't hear it at all when at 100kmh then I'd say it isn't the turbo

 

[Guest]

nah i dont think its the turbo.. the noise gets louder with the revs.. i would not have a clue what it is.. i went for a drive just before and i dint hear it..

 

[Guest]

i just had a thought.. coud it be my cat converter? i know they normaly rattle when they break but it copped a nice hard hit the other day..

 

[bradc]

Doubt it would whine unless some of the fins had collapsed and were at just the right angle to upset airflow. Doubt it though! Probably sound more like a whistle.

Does your gearbox have oil in it? (yeah I know how that sounds, but worth checking)

Any chance it could be an air leak?

 

[Guest]

If the cat copped a whack there could be more damage have a look at the splash guards they may be "humming".

 

[SiliconAngel]

A floppy splash guard will increase in loudness with speed, not RPM.

If the noise you're hearing goes up with RPM then it could be any number of things, but just because you're not seeing a subsequent symptom don't rule anything out - if a bearing is on it's way out you could well get lots of noise while the item in question slowly dies, but nothing will actually 'fail' and give you real symptoms until the bearing collapses completely.

Other than getting someone to stick their head in the engine bay while the noise is occurring, I can't see a solution that doesn't include pulling bits off - many components can be turned by hand / wiggled to see if the bearing is loose, but you'll have to pull belts off for much of it.

Do you happen to live somewhere near an Evo specialist workshop so they can take a look?

 

[Guest]

well after hearing the noise for a few days i decided to check my gear box fluid and well guess what.. it was low, topped it up and the noise is gone..
well i feel like a dick.lol
thanks guys for all your help..

 

[VR4 WRC]

Don't worry. I am sure that we have all done something similar. Glad to hear that it was easy as that.

Scott