Technical hissing/rattling sound on acceleration

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Technical hissing/rattling sound on acceleration

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Jul 22, 2012
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Hello!

So I didn't drive my car (1.9 sporting) for a few days, when I drove it today it seems to have developed a problem. It's making a hissing sound between 1500 and 2000 revs. It will stop as soon as I take my foot off the accelerator. It's sort of like a hissing/rattling sound. Hard to explain. Sounds like perhaps it's air escaping but more metallicy. It happens worse when I accelerate hard. However it doesn't make the sound if I rev the engine when I'm stationary, only when moving..

Any ideas?

Thanks.
 
Our 1.4 does something similar.
Sounds like something in the exhaust to me.
Maybe a silencer/baffles starting to work loose.
Only does it at low revs whilst labouring.

If i were to put it in to a word id say its sounds like shzushing noise. (not that such a word exists)
 
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Surely that's split turbo pipework?

Yeah, I'd go with that, is it a bit Smokey on hard acceleration by any chance?

The 1.9 has an elbow that splits easily IIRC; many forum members have bought silicone replacements from ebay.

P.s. Split boost hoses can be very hard to spot when the engine isn't under load as the splits close up when the boost pressure is low.
 
Yeah, I'd go with that, is it a bit Smokey on hard acceleration by any chance?

The 1.9 has an elbow that splits easily IIRC; many forum members have bought silicone replacements from ebay.

P.s. Split boost hoses can be very hard to spot when the engine isn't under load as the splits close up when the boost pressure is low.

Is there a thread for this elbow by ne chance :D:thumbup::beer:
 
I have just taken my 1.9 into a garage with the same hissing issue and black smoke. Has come back with a £291 price tag!!!! blimey but they did state it was the booster hose that was split
 
well i've noticed it definately only happens when the turbo kicks in. performance isn't affected at all.
Hi Freqface, I'm a newbie on multijet and driving a chevrolet spin that runs on Fiat multijet 1.3 75PS 190NM. I think I have this same problem. I have been using OBD and the rattling sound always happens on boost above 15 Psi "this is the boost pressure that usually pulls our car harder". And yes it is also happening on 1500-2500 revs.

I haven't seen the resolution of the problem. May I know the problem on your mjet 1.9 car?
 
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The most problematic hose is the one that comes down from the turbo and into the side of the intercooler (left side as you look at the car). There is also a metal elbow section before it joins the intercooler that is prone to corrosion.

Here's a picture from when I changed my turbo... its the section covered by a plastic bag. Just to get an idea of where to look.

20140712_161721.jpg


'Old Faithful' in the background. 2.0DTi Vectra! Sometimes I miss that car!
 
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I've got the whole intake pipe between turbo and intercooler filled with oil. Can this causing the rattle noise? The mechanic team said that all pipe is ok, they just filled with oil. How exactly does we tested the piping was ok?
 

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Oh yeah, it is also leaking oil at the connector to intercooler.
 
This is the leakage.
 

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After the cleaning and adding sealing the sound still rattling. And after hours of investigation, the problem just because mycar's AC expansion valve touches the body when accelerating. Silly problem but make me worried like hell....
 
If there's that much oil in the pipe leading to intercooler, there's a very good chance the intercooler itself has oil in it... take it off and rest it upright, on its side for a while to let it drain out. Then investigate where the excess oil is coming from. When my turbo blew I found that it had flooded the intercooler and pipes! A little bit of oil is normal but pooling of oil means somethings wrong.
 
The little tube on the pipe prior to the intercooler is suppused to take care of exessive oil. Yes, It was overflowed, but thanks to leaking pipe before intercooler, it's not flooding it. Have you found that oil problem on your car msted89?
 
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The little tube on the pipe prior to the intercooler is suppused to take care of exessive oil. Yes, It was overflowed, but thanks to leaking pipe before intercooler, it's not flooding it. Have you found that oil problem on your car msted89?

There is no little tube on the pipe prior to the intercooler, is there? Should just be one pipe from the turbo to the intercooler. Unless someone has adapted your original pipework to try and get rid of the oil, in which case that right there could be the source of your boost leak/hissing sound! Where does this small pipe go? Can you get a picture?? If someone has adapted your boost hose as some kind of oil return contraption... this is dangerous!

Yeah my oil problem was because my turbo blew its internal seals and spewed oil into the intercooler and intake system. I fitted a new turbo myself and cleaned the entire system and its all cured.
 
There is no little tube on the pipe prior to the intercooler, is there? Should just be one pipe from the turbo to the intercooler. Unless someone has adapted your original pipework to try and get rid of the oil, in which case that right there could be the source of your boost leak/hissing sound! Where does this small pipe go? Can you get a picture?? If someone has adapted your boost hose as some kind of oil return contraption... this is dangerous!

Yeah my oil problem was because my turbo blew its internal seals and spewed oil into the intercooler and intake system. I fitted a new turbo myself and cleaned the entire system and its all cured.

Sorry, the tube is actually exactly next to the turbo (the red circle). The arrow is pointing the connector to the turbo. Actually, I bought it fresh from factory, meaning it's the original setting, all Chevrolet Spin Multijet 1.3 has it. Ok then, have to check at the turbo sealing. Will update as soon as i got the result.
 
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