False flow readings from flow sensor.

[Richard L]

Originally Posted by hotshot25120

If I unclip the sensor no false reading I will try on something soft.

Have you got a result from this?

[Richard L]

On a closing look, the FAV is held in position with a cable tie rather using the bracket supplier with the system. It can be that secure as far as vibration is concerned. Bolt on the FAV properly and see if it improves.

Putting in a new sensor will not improve the situation.

[hotshot25120]

here a picture of my previous setup :



I tie the fav to the harness away from all the vibration after you tell me

"Is it possible for you to unbolt the FAV cluster and rest it on something soft and see if you see false reading. It is done on idle.

I try to establish what caused it. Mechanical vibration or electrical signal. Un-clip the sensor and see if the gauge still registers something."

[Richard L]

This is a mystery I dearly like to solve.

The soft surface test may move this forward.

[dave80]

hotshot I feel your pain man. I have been battling with this for months now and we both have gti's. I even moved the fav assembly under the rain tray where the ecu is located in our gti's without any luck. I had it running without any false readings last summer and i posted the pic of what location worked for me, but getting some false readings once again. Wondering if there is a manufacturer defect, since there was bunch of us who bought the hfs-4 kit at the same time from the group buy. Modhills from mk6 forum mentioned having false reading also. Funny thing is I didn't get any false reading for the first two weeks after the initial install. Also, I took the fav assembly apart hoping there was something stuck in there causing the problem, but there was nothing.

[dave80]

after looking at your pic hotshot the metal bracket on the fav assembly is touching the windshield fluid washer reservoir tube. That tube vibrates very much, especially with the spm engine mount you have.

[hotshot25120]

I try another different setup its better but I still have some false flow reading from time to time.

I install another HFS4 last weekend for a friend and he got the Rev 2 and I see a adjustement for the false flow reading is there any way to upgrade to a V2 ?

[Richard L]

Thanks for the update.

If the problem is electrical, we can solve it with electronics but mechanical problem has to be solved mechanically. Please tell me about your new set up.

The V2 does not have circuit modifications for the flow sensor. Can you tell me what that adjustment is?

[hotshot25120]

my new setup is fine but Ive got some random false flow reading.

After 1 week my friend got zero false flow reading and I use the exactly same setup as me for the FAV the only difference between the 2 set is he have a V2 and I have a V1.

I think I will try to swap hie V2 with my V1 to see if the false reading goes away.

[Richard L]

Can you check the pump relay is not pulsing during idling. If the 12v supply to the controller is not stable, it can make the pump come on intermittently and producing pressure pulses along the 6mm line.

Change controller and it still happens, it could be the above.