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Old 08-10-2017, 09:15 PM   #1
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Default Stall under braking

Hi,

Anyone have any ideas why a N52 engine would stall under hard braking , at random times?

Not always under braking it would stall, But when it does stall, The only way to get the car back to start is to get a jump-start.

On the forms, it someone say it is a sign of a failing brakes booster/vacuum leak,. But would having that result in the car not being able to start without getting a jump after the stall?
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Old 08-10-2017, 10:03 PM   #2
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Next time it does it, before getting a boost try starting it as if it's flooded (press gas pedal to the floor and hold). Sounds like you're overfuelling for some reason. And get your codes read out.
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Old 08-10-2017, 10:56 PM   #3
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Will get codes tomorrow, But I tried that method as well pressing - the gas pedal to floor and still no start. It sounds like it wants to start, but doesn't.
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Old 08-11-2017, 12:12 PM   #4
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the only thing a jump start brings to the scenario is your own battery or other parts of the battery/charging system is too weak to restart it again.

Perhaps getting a high compression situation for some reason and the battery can't overcome it? and the high compression is also what causes the stall?
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Old 08-14-2017, 02:06 AM   #5
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Need more details of your car, like year, model and manual or auto transmission?
What really happens when you can't start after stall?
Engine not turn over or when you try to start??
Also got,any faultcodes after stall?

Last edited by cmyachtie; 08-14-2017 at 02:28 AM.
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Old 08-17-2017, 04:42 PM   #6
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same thing is happening to my 2008 535i

only when cold it would try to stall when braking hard and sometimes it would actually stall

but mine restarts right up. no codes.
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Old Yesterday, 08:42 AM   #7
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Try this diagnostic test:

With the engine running at idle, Remove the oil filler cap.

Is it REALLY hard to remove? (due to a lot of vacuum)

After you remove it, does the engine start to idle roughly?
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