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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > Odd idle pattern after driving? negative ignition timing and high fuel rail pressure



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      06-06-2023, 12:28 AM   #1
cdziekan
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Odd idle pattern after driving? negative ignition timing and high fuel rail pressure

I have a 2011 e90 equipt with the n55 motor and after coming to a stop and putting the car in park the car it will sometimes have a odd idle pattern where the rpm bounces around a bit (~40-60 rpm variation) for about 30 seconds then goes back to normal nice and smooth idle.

here's a log you can see how at first the fuel rail pressure is around ~1700 psi with negative timing around -15 degrees, then after it randomly idling "rough" the fuel rail pressure drops to 700 and timing advances and idle smooths out.

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https://datazap.me/u/cdziekan/odd-idle-pattern-negative-ignition-timing-and-high-fuel-rail-pressure?log=0&data=4-16 


it only sometimes happens usually after driving the car hard. just wondering if this is normal or something is acting up.

any opinions is appreciated
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      06-29-2023, 10:12 PM   #2
cdziekan
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I noticed that the o2 sensor voltage drops when the idle starts getting weird. You can see in the log drops from 1.7 to 1.1 ish when itís iding bad
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      07-04-2023, 11:47 PM   #3
cdziekan
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