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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > LPFP sensor or HPFP?



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      11-07-2016, 08:14 PM   #1
X.X.I.V
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LPFP sensor or HPFP?

Had a question about what is considered Normal PSi on either High or low pressure fueling

The lpfp sensor is reading between 110 idle and 145.1 expressway driving
The high pressure is 750 at idle and about 1500 expressway

I did a 3 gear pull Ill post the log here
Later but it looked like lpfp sensor got down to 58psi and hpfp was around 2300psi

log from last night

http://www.datazap.me/u/mario0573/no...&data=12-21-22

log from 8-8-2016

http://www.datazap.me/u/mario0573/lo...&data=14-21-22
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Last edited by X.X.I.V; 11-08-2016 at 01:39 PM. Reason: added Logs
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      11-08-2016, 10:33 AM   #2
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      11-08-2016, 11:08 AM   #3
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I've never seen LPFP readings that high.

Post the log up for better perspective.
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      11-08-2016, 01:43 PM   #4
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added logs to first post.
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      11-08-2016, 02:31 PM   #5
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Those pressures are weird for sure...since you're getting a code for it though, I think it's safe to say that it's probably time to change out the sensor (I'd upgrade it and the pipe to the newest revision).

Also, those STFTs are getting pretty high towards the end of the run there. While you're waiting for the parts, I'd clear the codes, reset adaptations and pull another log.
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      11-08-2016, 04:17 PM   #6
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De-select the HPFP graph and take a closer look at the LPFP pressure graph. The initial graph looks as if it is holding steady (although the numbers look way too high to make sense) but you see a different graph without the HPFP messing up the scaling. The LPFP looks pretty stressed as the RPM rise.
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      11-08-2016, 04:41 PM   #7
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Quote:
Originally Posted by Velocity26
De-select the HPFP graph and take a closer look at the LPFP pressure graph. The initial graph looks as if it is holding steady (although the numbers look way too high to make sense) but you see a different graph without the HPFP messing up the scaling. The LPFP looks pretty stressed as the RPM rise.
Ok I can see that
I replaced the Lpfp bucket with a stage 2 from Fuel-last year when the numbers were getting into the 50's
So far I'm thinking its the lp Sensor causing the other part of the fueling to try to compensate.
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      11-09-2016, 11:49 AM   #8
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For what it's worth, I had a 29F3 code and just replaced my LPFP sensor this past weekend. Logging with JB4, the pressure reading was pegged very high and wouldn't fluctuate. After replacement, LPFP readings are back to normal.

Sourced just the sensor from ECS for ~$70 shipped. If I were to do it again, I'd go with the new version with the sensor and fuel line (as mentioned above). I read the sensor goes bad due to vibration and the new line is supposed to help.
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