Whistle Noise

[dazzagh]

Hi all, first post so go easy on me!!!

I got a 96 previa. When the revs go above 3000 - 3500, there is a whistle noise appears from underneath. Any one else had this?

Thanks Dazza

[sjray]

On my old one it was the exhaust that would whistle. Once I got over a certain speed, it would die away, but at about 40mph in overdrive it was annoying.

[billybobjoe]

if it is a turbo its most likly your turbo whitling.i drive a 2ltr T/D liteace and my turbo whistles.

[propnut]

Previa's do not have Turbo's as they have petrol engines. What's more they produce far more power without one than the diesel Estima's do with one.

Could be your exhaust manifold leaking. I would start here first before looking deeper. Start the car and then get under the driver side and listen for a slight popping noise. Get someone to rev the engine and/or hold the revs high at around 2500-3000 and see if the popping noise increases or turns to your whistle noise. If so you will have confirmed the gasket. A relatively simple job to do.

[dazzagh]

Hi all, the original post was some time ago. But i can confirm that i changed the rear box part of the exhaust & the whistle dissapeared.

Darren

[martin1]

Hi all, the original post was some time ago. But i can confirm that i changed the rear box part of the exhaust & the whistle dissapeared.

Darren

Glad you got it sorted, I have been told that there is a piece of metal in the exhaust that comes loose and has been known to cause the whistling as it flaps under the pressure in the exhaust

[moosaca]

As a virgin on the site I am glad to see this topic as I have a 97 Previa GS that sounds like a turbo diesel at the moment. The Service shop said there is rock all wrong with the exhaust, but as I have read, put your foot down and the thing starts whistling like a boiling kettle!!!!!

Time to get down to the roots!!

Regards,

Moose

[propnut]

As a virgin on the site I am glad to see this topic as I have a 97 Previa GS that sounds like a turbo diesel at the moment. The Service shop said there is rock all wrong with the exhaust, but as I have read, put your foot down and the thing starts whistling like a boiling kettle!!!!!

Time to get down to the roots!!

Regards,

Moose

Could be a collapsed matrix in the CAT or a blowing exhaust manifold gasket