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1.8 Tdci With Strange Engine Noise

engine noise 1.8 tdci

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#1 wideawakewesley

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Posted 23 June 2013 - 09:11 PM

I have a 56 plate 1.8TDCi Focus, which has had a number of issues this year (replacement fuel filter, injector and turbo intake pipe), but this latest one I have no clue about. From cold, the engine has been making a strange noise when I hit around the 2000 rev mark, it does appear to ease off after driving for a while, but I have no clue what's causing it and it's hard to describe. It's been happening for at least three months and has been to the dealer for the intake pipe to be fitted during that time. They never noticed/mentioned it and neither did I. To be honest I thought I was just being a car hypochondriac after the injector issue.
 

All being well you should be able check out the engine sound in the attached mp3s. If anyone has any bright ideas, I'd love to hear them. I'm not noticing any issues when driving the car, performance, acceleration etc. all seems as I would expect.

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#2 wase16ll

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Posted 23 June 2013 - 09:24 PM

first thought is the turbo 'whistling'  

pretty sure i can hear it in the the first recording just not as pronounced

 

alternativly, could be a auxillery belt pulley bearing

 

best to put your head under bonnet and see if you can locate an area the noise comes from, will help to pin down



#3 wideawakewesley

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Posted 23 June 2013 - 09:28 PM

The sound kicking in around 2k revs makes me think it's related to the turbo. When you refer to it as whistling, are we talking about a hole or tear in piping or something else?

thanks for the feedback



#4 wase16ll

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Posted 23 June 2013 - 09:36 PM

normally, the whistle is the turbo itself, brother has the same issue on his Honda, doesnt run any different, no loss of power or anything, prepared to live with it till we have time to remove and strip/clean it...

beyond that, have never actually looked into what causes a whistle...its possible it can be caused by a split, but more inclined to believe it will have something to do with the turbo bearing or vanes



#5 wideawakewesley

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Posted 23 June 2013 - 09:45 PM

normally, the whistle is the turbo itself, brother has the same issue on his Honda, doesnt run any different, no loss of power or anything, prepared to live with it till we have time to remove and strip/clean it...

beyond that, have never actually looked into what causes a whistle...its possible it can be caused by a split, but more inclined to believe it will have something to do with the turbo bearing or vanes

 

I wouldn't even attempt that myself (I'm a total novice), but would it be a big job for a garage and is it the kind of thing you'd want to trust to a dealer? I assume living with it wouldn't result in further problems?



#6 wase16ll

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Posted 23 June 2013 - 10:05 PM

if im right and it is turbo 'whistle' it is something worth having checked to make sure its not a split/crack in the system, plus make sure there is no nastier noises coming from turbo which may cause it to fail..

quite often find turbos whistle after a while yet not cause any further problems, know of a number of cars with varying decibels of whistle that have been like that for thousands of miles, so could be harmless.

in fact you can buy fake whistles to give the impression car has turbo fitted??   no, i dont know why either???

plus some to increase the volume of whistle for cars with turbos??   strange, but true

 

worth getting checked though just to make sure you dont have more serious problem pending....personally, i would opt for a turbo specialist rather than dealer



#7 jeebowhite

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Posted 24 June 2013 - 11:47 AM

Check all the hoses, more likely that you have a small split in one of the rubber hoses



#8 wideawakewesley

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Posted 24 June 2013 - 12:56 PM

Check all the hoses, more likely that you have a small split in one of the rubber hoses

 

I'll see what I can find, although the sound is noticeably different to the sound I'd normally associate with a split hose. The ones I've had go in the past have tended to make more of a whooshing sound. I'd love it to be just a hose though.

:)

Thanks for the assist.



#9 wase16ll

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Posted 24 June 2013 - 10:31 PM

a very tiny split can cause a whistle, thats why i suggested trying to locate the sound with head under the bonnet...if its turbo then its fairly obvious, but splits can cause it too [even cracks in the manifolds can do this too}

dont forget, i maybe wrong as im only going on those recordings, could be something totally unrelated...see if you can pin down a specific area on the engine and go from there



#10 wideawakewesley

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Posted 01 July 2013 - 11:32 AM

Had three heads under the bonnet at the weekend and we all think the sound is coming from the drive belt area (right hand side of engine), rather than where we believe the turbo is located (rear of main engine body). It's got 92k on the clock and the Hayne's manual suggests the drive belt be replaced at the 100k service.

I've attached an image (not my engine, but appears to be same layout) which marks where we think the sound is coming from (roughly).

 

JHNb6Ad.jpg



#11 IINexusII

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Posted 01 July 2013 - 12:20 PM

get some sort of silicone spray or wd40 and spray it onto the drive belt. if the sound stops then thats what you need to replace



#12 wideawakewesley

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Posted 01 July 2013 - 12:45 PM

get some sort of silicone spray or wd40 and spray it onto the drive belt. if the sound stops then thats what you need to replace

 

I know nothing about this sort of thing, but isn't spraying lubricant on a drive belt going to make it slip?



#13 IINexusII

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Posted 01 July 2013 - 02:09 PM

I know nothing about this sort of thing, but isn't spraying lubricant on a drive belt going to make it slip?

just a tiny bit wont do no harm. thats how i noticed mine needed replacing



#14 STEADS

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Posted 01 July 2013 - 05:18 PM

It's a comin trick in the trade and no it doesn't make it slip one way to find out if the alternator bearings are drying out as well done it on loads of cars never a problem like above if noise disappears there's the problem area

#15 ippy

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Posted 01 July 2013 - 06:57 PM

might be worth checking the water pump and alternator to,



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