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Home > Technical > Engine vibration on start up |
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Andy131 Member Since: 09 Dec 2009 Location: Manchester Posts: 2184 |
Could be a sticking throttle body, in the inlet is a butterfly valve, when you stop the engine this flap closes and shuts off the air supply meaning that the engine shuts down smartly, rather than the couple of extra lumpy revolutions of older cars. This butterfly valve is supposed to be open when the car starts / runs, if it is failing (and they do) then it might have closed when you switched off, but only partially opened when you next started = lumpy running and will not rev properly. Turning off and on again gives the valve another chance to open properly. This can continue for months before it finally dies.
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3rd Jun 2020 2:51 pm |
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TooBlue Member Since: 30 Oct 2019 Location: Midlands Posts: 265 |
You need to see if there are any fault codes.
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3rd Jun 2020 3:43 pm |
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alex_pescaru Member Since: 12 Mar 2009 Location: RO Posts: 4642 |
If the car is post MY2010, meaning EDC17 ECU, it can do that because of a glitch in the firmware. IIRC, bad identification of cylinder order... |
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3rd Jun 2020 4:25 pm |
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Alan14 Member Since: 03 Jun 2020 Location: London Posts: 2 |
Thanks Andy. The throttle body issue sounds very relevant. It went to a dealer today for MOT. They think there’s a rattle from the high pressure fuel pump that needs investigation. I’ll raise the throttle issue. Best get it all looked at. Cheers. |
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3rd Jun 2020 10:30 pm |
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dorsetfreelander Member Since: 20 Jul 2013 Location: Dorset Posts: 4354 |
I had this on my 2011 model it would happen perhaps twice a year. You start the engine and the whole car rattles and vibrates, you stop and start again and all OK. It's never happened on my 2014 SD4. 3 x FL1 2 manual + 1 auto
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4th Jun 2020 8:42 am |
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iansoady Member Since: 27 Feb 2020 Location: Redditch Posts: 35 |
I had something similar when I started mine after it had stood idle for a couple of months. It was fine after that. I suspected air in the injection circuit but as it didn't recur decided to forget it. Ian.
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4th Jun 2020 9:33 am |
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