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  #1  
Old 10-25-2019, 11:52 AM
bodek_wr bodek_wr is offline
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Cyclic sound from rear of engine

Hi,

I found strange cyclic sound coming from rear part of engine, where the sound is inependent on engine speed.
It is hearing from 4 second:
engine sound
it is like an "farting pump".
Additionally, when I unplug the cables, marked on picture, the sound disappeared and engine gets like new power (even "increassing emmision" was pop-up).

I assume, there is something which block air or suppress the power nad trying to open itself but
without success.

Any advice what I should look for will be great.

One more thing to mention, the fuel consumption was increased by ~20% for last year. Maybe it is a reason?

(What I did already -> cleaned EGRs, cleaned manifold, replaced thermostats)

thanks

M.
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  #2  
Old 10-25-2019, 09:51 PM
robnitro robnitro is offline
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Jagshemash, my name a borat hehe

What you unplugged was the rail pressure sensor. You might have an injector issue causing leak back and unplugging the sensor makes the pump run a higher pressure.

Get ista-d and run the smooth running diagnostic to check your injector balance.

If it's not that, it could be the swirl flap actuator going back and forth. That's also near the rear of the engine on the underside of the intake.
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Last edited by robnitro; 10-25-2019 at 09:53 PM.
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Old 10-28-2019, 03:13 AM
bodek_wr bodek_wr is offline
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Hi Robnitro,

that was my first thought that flip actuator trying move forward and back, but when I kept touching the rail of the actuator, it has pushed the rail forward once when I started engine. Maybe the problem is inside the actuator (has no power to move after first move).
Regarding the live data of injectors, I checked it a wekk ago on INPA and all of them keep the margin below +- 1 (corrections).
The fuel pressure is arround 3,8 (INPA). Wht I should check further?

best regards

M.M.
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Old 10-29-2019, 10:06 AM
BMWe70 BMWe70 is offline
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Hi

I would be very interested in outcome of this. Have same noise coming from back of engine. So far replaced EGR solenoid to no help. Swirl flaps are removed but actuator is still on I guess.
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Old 10-30-2019, 07:08 AM
robnitro robnitro is offline
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Even if you disconnect the flaps the actuator may hunt if the dde is still looking to use the flaps.
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Old 11-04-2019, 07:07 AM
BMWe70 BMWe70 is offline
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So I guess it is prety harmless then? Can I disconnect electric to actuator?
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Old 11-04-2019, 10:48 AM
robnitro robnitro is offline
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Try it and see if you get codes... It depends on the tune.
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Old 11-07-2019, 06:27 AM
BMWe70 BMWe70 is offline
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Is connector at the top back right side of the engine as you looking at it?
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Old 11-08-2019, 04:03 AM
robnitro robnitro is offline
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Yes but make sure it goes to under the manifold. Look up a picture of your manifold on realoem.com to make sure... It'll be hard to disconnect from above because the connector has 2 clips and one side is next to something.
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