"Boost Controller Solenoid N75"
- Thread starter Skute
- Start date
common fault item, cheapish to replace you could do it yourself if you get the part from euro car parts, then swap out. the N75s offical name is the boost control valve.
VWs offical text on it is :-
The solenoid valve for charge pressure control N75 applies pressure to the charge
pressure control valve on the exhaust gas turbocharger (waste gate).
Valve N75 receives electrical signals (pulse duty factor) from the EDC control unit.
Charge pressure is thus regulated according to a characteristic map.
Feedback on the actual pressure in the intake pipe is provided along a hose connection
routed from the intake pipe to a sensor in the control unit.
If a deviation from the setpoint occurs, the pressure is corrected accordingly.
The charge pressure is also corrected in the control unit by the intake pipe temperature
to make allowance for the effect of temperature on the density of the charge air.
To ensure that the air mass supplied to the engine stays almost constant, the
charge pressure specified map is corrected in dependence on the air pressure using
the information supplied by the altitude sender F96. The charge pressure is reduced
above an altitude of approx. 1500 m to prevent the turbocharger overspeeding in
excessively thin air.
Solenoid Valve for Charge Pressure Control N75
The EDC control unit sends output signals to the solenoid valve for charge pressure control N75 according to the charge pressure specified map. By changing the signal pulse duty factor, more or less intake manifold pressure is applied to the charge pressure control valve on the exhaust gas turbocharger.
The charge pressure can thus be varied between the minimum and maximum permissible values.
The solenoid valve for charge pressure control N75 applies pressure to the charge
pressure control valve on the exhaust gas turbocharger (waste gate).
Valve N75 receives electrical signals (pulse duty factor) from the EDC control unit.
Charge pressure is thus regulated according to a characteristic map.
Feedback on the actual pressure in the intake pipe is provided along a hose connection
routed from the intake pipe to a sensor in the control unit.
If a deviation from the setpoint occurs, the pressure is corrected accordingly.
The charge pressure is also corrected in the control unit by the intake pipe temperature
to make allowance for the effect of temperature on the density of the charge air.
To ensure that the air mass supplied to the engine stays almost constant, the
charge pressure specified map is corrected in dependence on the air pressure using
the information supplied by the altitude sender F96. The charge pressure is reduced
above an altitude of approx. 1500 m to prevent the turbocharger overspeeding in
excessively thin air.
Solenoid Valve for Charge Pressure Control N75
The EDC control unit sends output signals to the solenoid valve for charge pressure control N75 according to the charge pressure specified map. By changing the signal pulse duty factor, more or less intake manifold pressure is applied to the charge pressure control valve on the exhaust gas turbocharger.
The charge pressure can thus be varied between the minimum and maximum permissible values.
Not often, no. If it dies completely then it should do, but if it's just playing up a bit then I wouldn't expect it to, unless it causes other problems that raise a fault as a consequence of a faulty N75.
2nd question
ON the ko3/Ko3s actuator, are they that stiff? jus was checking mines and it was abit hard to move! Do they move easily or are they quite hard.
Cheers all in advance for replying
fahafiz - yes, yours is a non pd i think from memory so yes it will.
biglad - dont know about petrol stuff im afraid.
biglad - dont know about petrol stuff im afraid.
There are a few... but irregular boost, hesitation, power dips or spikes or a lack of boost can all be related to a faulty N75
Sounds like mine is faulty then,
noticed that it has the odd slight hesitation and spike now and then.
Where would i get one from and could someone like me (little tech knowledge) be able to change it?
You can get them from Seat, Audi, VW, Skoda... or places like GSF, Euro Car Parts, VagParts.co.uk or even second hand usually.
Piece of cake to fit. One electrical connector and three small pipes to change over. A 5 minute job if that.
Piece of cake to fit. One electrical connector and three small pipes to change over. A 5 minute job if that.
Hey rob, I noticed on hard acceleration the power delivery is up and down, hard to explain but its not very smooth, kinda goes more, less, more, less, more (man i'm crap at explaining myself)
Anyways, does the N75 sound like the culprit?
It could be any number of things, but the N75 is a possibility.
The trouble, the symptoms you and other people have described could relate to a couple of things, the MAF and N75 being the favourite two options. They can both cause very similar problems with very similar affects.
The trouble, the symptoms you and other people have described could relate to a couple of things, the MAF and N75 being the favourite two options. They can both cause very similar problems with very similar affects.
Thanks Rob,
So i guess the first thing to try is disconecting the MAF for a short time and seeing if that makes any difference???
So i guess the first thing to try is disconecting the MAF for a short time and seeing if that makes any difference???
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