Sucking / whooshing noise when under load

davesnapeuk · Nov 14, 2010

Hi, I've got a 1994 300TDI that has developed a strange noise this morning.

Whilst driving along I suddenly realised than when the engine is under load (e.g. going up hill and accelerating) there is a sucking noise. It sounds to be coming from the passenger side behind the glove box and the wierd thing is that when I reach my target speed and throttle back, the niose disappears completely.
The sucking noise is quite loud and I can't see any hoses that are detacted or broken. The noise does not occur when the vehicle is stationary and I rev the engine. power seems to be a bit down compared to yesterday as well.

Any suggestions of where to look?
Thanks, Dave

MikeDISCO · Nov 14, 2010

Bottom hose connecting turbo to intercooler, maybe split or come off

discool · Nov 14, 2010

What side is your exhaust manifold on, do u think there's any poss of the sound could be coming from there.

Graham Carter · Nov 14, 2010

I'd agree - sounds very like a turbo hose failure.

Dids · Nov 14, 2010

or possibly the inlet manifold gasket?

pindie · Nov 14, 2010

Has a hose blown off? Check the lower more awkward ones with your hands (engine off!)

You can also get some one to reve it whilst staionary and you can peer into the engine bay (engine on so hands out!!!!!). Get the revver to press the pedal to the floor quickly and then release. This should give you a puff of smoke from where the leak is.

This should help locate it.

Mpower! · Nov 14, 2010

davesnapeuk said:
Hi, I've got a 1994 300TDI that has developed a strange noise this morning.

Whilst driving along I suddenly realised than when the engine is under load (e.g. going up hill and accelerating) there is a sucking noise. It sounds to be coming from the passenger side behind the glove box and the wierd thing is that when I reach my target speed and throttle back, the niose disappears completely.
The sucking noise is quite loud and I can't see any hoses that are detacted or broken. The noise does not occur when the vehicle is stationary and I rev the engine. power seems to be a bit down compared to yesterday as well.

Any suggestions of where to look?
Thanks, Dave

mine makes the exact same noise mate! never known any different till now!

Dids · Nov 14, 2010

I take it when the op says he's checked and none of the hoses has detached we should all ask if a hose has come off?

GRATCH · Nov 14, 2010

Dids said:
I take it when the op says he's checked and none of the hoses has detached we should all ask if a hose has come off?

davesnapeuk said:
I can't see any hoses that are detacted or broken.

He says he can't see, which usually means he's popped the bonnet, looked briefly, then shut the bonnet again. Hoses could be split underneath out of view. Why don't you tell us what his problem is then, as it's obviously not hose related

Dids · Nov 14, 2010

Dids said:
or possibly the inlet manifold gasket?

Read threads properly often?

GRATCH · Nov 14, 2010

Dids said:
Read threads properly often?

Don't be silly

rewmer · Nov 14, 2010

Head gaskets gone. Put your hand over the inlet and you should be able to feel a pressure pulse as the gone cylinder fires.

CharlesY · Nov 14, 2010

rewmer said:
Head gaskets gone.

OK so far ... it's a possibility.

Put your hand over the inlet and you should be able to feel a pressure pulse as the gone cylinder fires.

Put hand over inlet WHAT exactly? Elucidate please.

CharlesY

davesnapeuk · Nov 15, 2010

Thanks for all the suggestions.
As someone suggested, I had merely popped the bonnet, looked in and seen nothing obvious. I'm going to have a better look this morning and, if I still can't find it, nip down to my local garage.

I'm reallly hoping it's a split hose rather than the head gasket though!

rewmer · Nov 15, 2010

CharlesY said:
rewmer said:

Head gaskets gone.

OK so far ... it's a possibility.

Put your hand over the inlet and you should be able to feel a pressure pulse as the gone cylinder fires.

Put hand over inlet WHAT exactly? Elucidate please.

CharlesY

Click to expand...

Air inlet to the filter.

davesnapeuk · Nov 15, 2010

Well what a dork I feel. I went under the bonnet again with torch in hand and still could not find anything untoward.
I took the disco to my local garage who popped up the bonnet and immediately noticed that the jubilee clip was loose on the hose where the rubber hose connects to the metal pipe to run to the intercooler. 2 minutes with a screwdriver and I have full power and a quiet (as much as it can be) disco again.
Thanks all.

Dewin · Nov 15, 2010

davesnapeuk said:
Well what a dork I feel. I went under the bonnet again with torch in hand and still could not find anything untoward.
I took the disco to my local garage who popped up the bonnet and immediately noticed that the jubilee clip was loose on the hose where the rubber hose connects to the metal pipe to run to the intercooler. 2 minutes with a screwdriver and I have full power and a quiet (as much as it can be) disco again.
Thanks all.

:doh: at least it's sorted now lol

MikeDISCO · Nov 15, 2010

bloody good I am

rewmer · Nov 15, 2010

I'll get me coat.......

Dids · Nov 15, 2010

rewmer said:
I'll get me coat.......

I'll join you.

Sucking / whooshing noise when under load

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