Oil Level Rising?

[Greebo]

1.9 diesel with unit injectors has rising oil level- must be diesel

I had similar prob 2 years ago and changed tandem pump and had injector seals renewed, which cured it.

Recently the water tempeature gauge which was intermittent (sender was renewed) has now failed completely so I am wondering if this also feeds the ECU for over-fueling when engine cold?

This temp sender, below tandem pump, however has two wires only (2000.75 on TIS) brown=earth blue=5volts so I wonder if this only feeds ECU and the gauge is fed from a second sender and therfore the failure of the gauge probably doesn't matter?

Do you think overfuelling is likely to raise oil level 6mm in three weeks?

[SilverBeast]

On my 2005 TDI 130 the temp sensor is for both temp gauge and engine management. My glow plug light used to stay on for around 10 sec till I changed it, and temp gauge never worked until it was at 90C which was most of the time as I use it mainly for less than 30 min journeys

[Greebo]

Thankyou SB

So you think the two wires feed both ecu & gauge......

Even if I short the two wires the gauge does not move so presumably the ECU is also getting no temp value.

Do you think this would cause constant overfuelling- enough to raise the oil level over three weeks?

[SilverBeast]

I ran mine for over a year with a faulty sensor, though mine only seemed to have an issue at certain temperatures. I wouldn't expect it to get diesel in the oil though I'm no expert. This is my first diesel. I would only expect this to happen if the engine was worn in some other way. Someone with more knowledge will be along soon. That's the good thing about this site. I would replace the sensor anyway, just make sure you get the right one as there are different types. I got mine off eBay for less than £15

[Greebo]

Update;  Decided to change the injector seals again (myself this time, not too difficult) AND changed water temp sender at same time.

This seems to have cured the problem.  The temp sender on this 115 PD AUY is 2pin and would seem to drive both the dash gauge and the ECU.  Very strangely though I shorted the pins in an attempt to deflect the gauge but this had no effect yet now the new sender has been fitted the temp gauge works perfectly!!

[xavier]

greebo, thanks for popping back in with an update, always great if people fix a problem and then update the thread.