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BMW 3-Series and 4-Series Forum (F30 / F32) | F30POST > Technical Forums > N47 and N57 Turbodiesel Engine / Drivetrain / Exhaust Modifications > F30 320d 2012 engine inock
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      11-15-2020, 05:00 AM   #1
United Kingdom

Drives: F30 BMW 320D
Join Date: Oct 2020
Location: Uk

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F30 320d 2012 engine inock

Hi everyone. I have my BMW with engine knocking sound.
Things complete:
1.Removed valve cover and checked timing chain OK
2.Checked lifters and rocker arms OK
3.Checked timing OK
4.Tested injectors N4 dead all other 3 not good. Replaced
5. Starterted car with new injectors - it ran perfect for 5 minutes and knocking came back

I just wonder that possibly when new injectors were installed the fuel pressure was just building up. When fuel pressure rised the noise was present.

Can High Pressure Fuel Pump make knocking sound at high pressure buildup.

Or it could be other way round, it will knock when there is not enough pressure coming from tank due to clogged fuel filter.
Fuel filter was replaced week before it happened. Also filled up full tank 2 days before it happened.
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      11-18-2020, 05:15 AM   #2
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Drives: f30
Join Date: Aug 2019
Location: dz

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My f30 320d knock also until get warm up 100
If your engine knock even the the engine is warm up , so you have something wrong

Did you check oil system
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