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  #1  
Old 09-09-2018, 05:06 PM
sbrunthaler sbrunthaler is offline
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Default Flow sensor behavior changed after removing it

Hi,

due to some repairs in the engine bay, we removed the flow sensor carefully from its location near the FAV. It worked fine before, and the HFS3 was doing well with recognizing fail / OK conditions.

After we have put everything back in place, the flow sensor (rsp. the bars on the gauge) show a much smaller flow, so the HFS3 reports constant failure when the injection is being triggered.

The water is flowing, the spray "image" looks the same as before. The red "S" is lit, and I get max. 1 bar on the gauge at full flow where I saw 6 bars before. When I turn SC clockwise, I can get 3 bars, thats all.

I took a closer look at the flow sensor. There is that "knob" in the middle that should get in touch with the pipe, as far as I understand. The surface of the "knob" is hard and a little rough, as if there are remains of glue and some plating has come off.

Should there be a pad or cover on the "knob" in the middle of the flow sensor?

Or what else could be the reason that the sensor has changed its behavior?

Thank you and regards,
Stefan
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  #2  
Old 15-09-2018, 08:17 AM
Richard L Richard L is offline
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Default Re: Flow sensor behavior changed after removing it

what is the serial number of the controller?
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  #3  
Old 16-09-2018, 07:06 PM
Richard L Richard L is offline
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Default Re: Flow sensor behavior changed after removing it

please send a picture. Not sure what you are describing. We don't use glue.
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  #4  
Old 16-09-2018, 09:25 PM
sbrunthaler sbrunthaler is offline
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Default Re: Flow sensor behavior changed after removing it

Sorry, was offline some days, and the car is currently at a workshop for other reasons.
I can give the info next Saturday.

Thanks,
Stefan
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  #5  
Old 22-09-2018, 01:46 PM
sbrunthaler sbrunthaler is offline
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Default Re: Flow sensor behavior changed after removing it

Hi,
I took a picture of the flow sensor (attached).
The surface of the circular area is not smooth but rough.
Is that intended?

BTW, the nozzle was clogged. But I would like to know if the sensor is Ok anyway?

Thanks
Stefan
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File Type: jpg flow-sensor-hfs3-s.jpg (195.4 KB, 2 views)
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  #6  
Old 22-09-2018, 10:55 PM
Richard L Richard L is offline
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Default Re: Flow sensor behavior changed after removing it

Does the gauge showed 6 bars now? Despite the roughness of the sensor surface.

I think the sensor head is OK.
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Old 23-09-2018, 07:56 PM
sbrunthaler sbrunthaler is offline
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Default Re: Flow sensor behavior changed after removing it

Yes it does.
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  #8  
Old 24-09-2018, 07:34 AM
Richard L Richard L is offline
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Default Re: Flow sensor behavior changed after removing it

no need to worry about the rough surface then?
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  #9  
Old 24-09-2018, 09:39 AM
sbrunthaler sbrunthaler is offline
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Default Re: Flow sensor behavior changed after removing it

Obviuosly everything works now.

Thanks and regards,
Stefan
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  #10  
Old 26-09-2018, 10:20 AM
Richard L Richard L is offline
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Default Re: Flow sensor behavior changed after removing it

It is funny that the prime suspect is always the aquamist system at fault, even a clogged jet is most obvious place to look in the first place.

This industry must have a bad reputation of system breaking down.
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