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  3. N52 sluggish acceleration and fluctuating Idling.
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Pinoy Boy
Mar 6, 2019
  ·  Edited: Mar 6, 2019

N52 sluggish acceleration and fluctuating Idling.

during deceleration at a traffic light idle will raise/surge up slightly. during accelaration if I hold on 3rd head at 4k for 10 seconds then accelerating is the only time I can feel the power of the 3IM with the AA tune. I do all my own work unless Indy is necessary.


My guess is a pcv on the valve cover, disa needs to be replaced or VVT needs recalibration.


So far things I’ve replaced since I’m at 115k in mileag.

2 camshaft sensors

2 vanos selanoid

maf

battery is good

went in for vent hose heater recall

post and pre o2 sensors repalced

reset all adaptations

fuel pump and fuel pressure regulator

new coils and plugs

water pump and thermostat


Will be replacing valve cover next, eccentric sensor

Valvetronic motor

crank shaft sensor


any insight would be greatly appreciate.



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BMW Workshop
Mar 6, 2019

That could be a lot of things, vacuum leak, or bad coil pack, or even a Vanos solenoid

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BMW DOCTOR DEAN
Mar 11, 2019

Update your firmware it cures the problem check my video on the rough idle fix

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Pinoy Boy
Mar 31, 2019

I saw the video but I don’t want to go to the dealership for an update. I’m learning inpa, ista right now, once I learn the software I’ll update through Daten files... thanks!

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Rich Sheffey
Apr 2, 2019

Have you checked the PCV? If the PVC gets too bad then you risk getting oil into the engine and eventually into the Cadillac converter / exhaust

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Rich Sheffey
Apr 4, 2019

any updates???

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