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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 rough idle and rough engine
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      10-25-2020, 01:08 PM   #1
IgorsSunaBMW
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F30 320d 2012 rough idle and rough engine

Hi everyone. I am having issues with rough idle and bad engine performance.
Things done:
Cleaned air intake manifold
Checked for leaks on air intake pipes
Replaced MAF sensor
Cleaned EGR valve
Changed oil, oil filter, air filter, fuel filter.
Checked injectors all read same resistance

When car is idling the Maf sensor reading goes erratic from 1-14g/s up and down, not smooth graph

Oxygen sensor reads 0.980V but when accelerate it drops to 0.2V and when let accelerator go it jumps to 1.2Volts and goes back to 0.9Volts.

It is the same at idle or warm engine.

Car was vibrating before as it would have bad flywheel but after cleaning all sensors and air manifold it stopped vibration so not flywheel after all.

What can cause erratic readings for Maf and oxygen sensor 1.2V reading.

Just to add I cleaned MAP and crankshaft sensor too.

Throttle position is 85% at all times. When stop start it goes to 14%

All pulleys are new including crankshaft pulley. Car has 157k miles on the clock
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      10-25-2020, 04:46 PM   #2
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The throttle is usually zero during run, hmm.. I wonder if it's related.
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