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20-09-2019, 04:52 AM
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#1 | ||
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FF.Com.Au Hardcore
Join Date: Oct 2005
Location: Auckland, NZ
Posts: 1,266
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There is a buzzing noise from the engine when I turn it off. It only happens when the engine is hot - at this time of year, 10 minutes from a cold start. The check engine light isn't on and it runs perfectly, although maybe slightly louder than usual.
Is this the EGR valve?
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MB Mondeo TDCi wagon, sea grey, on MAK Invidia 16" wheels. |
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20-09-2019, 07:55 AM
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#2 | ||
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FF.Com.Au Hardcore
Join Date: Mar 2013
Posts: 805
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If it is a valve it's likely the turbo vacuum boost control valve.
If there are two of these valves the one closer to the front is the egr vacuum control valve. It differs from an electrical buzz in sounding more fart like. These valves are identical and you can swap them round for testing. MC has just one for the turbo, egr went electrical. They can be recognised by distinctive brown colour and three vacuum ports. May or may not affect turbo performance. Mine made a noise for a few years before I replaced it. Last edited by rondeo; 20-09-2019 at 08:13 AM. |
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20-09-2019, 02:55 PM
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#3 | ||
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Challenge Accepted!
Join Date: Jan 2006
Location: Under the Southern Cross
Posts: 882
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yep mine is still doing it all these years later.
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Undecided replacement... [SOLD] -2009 MB Mondeo Zetec TDCI- [SOLD] |
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20-09-2019, 03:32 PM
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#4 | |||
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Regular Member
Join Date: Dec 2015
Location: Dubbo, formerly Canberra
Posts: 342
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Mine buzzes/moos also. (If you're describing the short - about 1-2 seconds long - noise it makes immediately after shutting off the engine.)
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2011 Mondeo MC Titanium TDCi wagon, Panther Black - new Powershift sensor: Nov 2016 Quote:
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20-09-2019, 08:22 PM
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#5 | |||
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FF.Com.Au Hardcore
Join Date: Oct 2005
Location: Auckland, NZ
Posts: 1,266
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Quote:
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MB Mondeo TDCi wagon, sea grey, on MAK Invidia 16" wheels. |
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Unusual noise when turning off the engine
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