BMW 116i N45B16 Crank Sensor Signal

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brucestafo
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BMW 116i N45B16 Crank Sensor Signal

Post by brucestafo » Tue Aug 13, 2019 1:51 am

Hello, I need someone to tell me if they have seen this waveform on the above vehicle.
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BMW_1 Series_WOT.psdata
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landroverman1958
OneWave
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Re: BMW 116i N45B16 Crank Sensor Signal

Post by landroverman1958 » Tue Aug 13, 2019 5:55 am

Hi have you got your sample rate turned up enough?I have,nt seen a crank signal like that on that type of engine,

vasek
OneWave
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Re: BMW 116i N45B16 Crank Sensor Signal

Post by vasek » Tue Aug 13, 2019 7:14 am

Support opinion.
The crankshaft sensor signal on this engine should look different.
Like this example.
If Your question is about the shape of the signal at high RPM,the tooth signal really becomes triangular.

BMW N45B16 SYNC 2 ms.png
Attachments
BMW N45B16 RPM=5000.PNG

brucestafo
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Re: BMW 116i N45B16 Crank Sensor Signal

Post by brucestafo » Tue Aug 13, 2019 8:21 am

Ok, so this is a normal signal shape at high rpm. The specs on this car says 0-60 in 10.3 sec. I am getting 15.6 secs with RON 95 gasoline. Customer is reporting lack of power. What is the maximum calculated mass air at WOT? At 6000 rpm with WOT I get: 46 km\h in 1st gear; 74 km\h in 2nd gear; 116 km\h in 3rd gear. Also at WOT accelerating Lambda is around 0.6-0.7.

brucestafo
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Re: BMW 116i N45B16 Crank Sensor Signal

Post by brucestafo » Tue Aug 13, 2019 8:39 am

Here are two snap shots of the VANOS at idle. First one taken in 2018 and the second is at present.
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Vanos2.pdf
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Vanos1.pdf
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Iver
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Re: BMW 116i N45B16 Crank Sensor Signal

Post by Iver » Tue Aug 13, 2019 2:17 pm

the engine runs so there wont be much wrong with Crank Sensor unless you are getting a code for it.

As for fuel consumption, 0-60 etc then that only applies when the car is tested. those figures can normally not be achieved when the car is new.
You will get sucked into a black hole with that job

Look at your Short & Long term fuel trims, temperatures etc then jog it on to someone else to waste time with

brucestafo
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Re: BMW 116i N45B16 Crank Sensor Signal

Post by brucestafo » Thu Aug 15, 2019 6:20 pm

Thanks. Have to say that I agree with you. The only other thing I found was spark plugs. I replaced them and returned the vehicle. Customer called the next day to say that she sees a definite improvement.
Thanks for the advice and waveforms, it prevented me from going too far down the rabbit hole.

brucestafo
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Re: BMW 116i N45B16 Crank Sensor Signal

Post by brucestafo » Thu Aug 15, 2019 6:47 pm

Here is the before and after
Attachments
Spark compare.jpg

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