free hit
High Oil Pressure (indication) - Engine/Ancilliaries - The Lotus Forums - Official Lotus Community Partner Jump to content


High Oil Pressure (indication)


Recommended Posts

Almost all oil pressure problems are low oil pressure (indication).

I have the opposite namely a high oil pressure (indication), when the engine is idling the needle  of the dash gauge goes completely to the rightside past the 7 mark.

I have done the following in order to try to solve the problem:

  • Replaced the oil pressure sender however it didn't solve the problem
  • Measured the oil pressure with a gauge. (T junction made at the oilfeed line coupling at the turbo). Measured 4.5 bar engine idling 1200 RPM, measured 5.0 bar at 3000 RPM (engine / oil was cold), indication in the dash was 7+
  • Checked dash gauge indication. removed the "WN" (White - Brown stripe) wire from the sensor and connected a potentiometer to it. See table below. No obvious misreadings / indications. The gauge indications in relation with the resistor values match (almost) the 0 - 184 Ohm curve of a 0 - 10 bar VDO pressure sender. (end point is different).
Gauge Mark Resistor value (Ohm)
0 - Red 8.23
1st white stripe 48.7
2nd white stripe 70.9
3rd white stripe 86.8
4th white stripe 110.9
5th white stripe 128
6th white stripe - 7 145.5


  • Measured the resistance between the sender housing and the engine block, almost 0 Ohms (0.1 Ohm), so no problem there
  • Disconnected the Oil pressure warning switch wire and started the engine, no joy needle goes to the max.


Some other things:

  • The Oil in use is Castrol Edge 10W 60, engine filled in may 2019 from unopened/sealed "containers", these have been sitting on the shelf for about 4 years before being used.
  • The standard oilcooler flange between the oilfilter and the oilpumphousing is replaced by a thermostatic version (Mocal IIRC).
  • I saw the the dash gauge indication drop 1 or 2 times during a testdrive on the highway, everything nice and warm. After a very short time the needle went into the corner again.


If anybody got some ideas / info etc for solving the problem I would be more than gratefull.




Esprit Freak

Link to comment
Share on other sites

Upgrade today to remove Google ads and support TLF.
  • Replies 7
  • Created
  • Last Reply

Top Posters In This Topic

Wow if the gauge checks out and the pressure from the motor is right - it has to be the sender???  Can you check the out put from the sender at different pressures and see if it matches to your gauge test roughly?

Link to comment
Share on other sites

The car was of the road for about 5 years after a headgasket failure.

Since june this year it is running again (okay some very minor problems but all solved except the high oil pressure (indication)).

The above problem manifested itself after the first starts so after eliminating a couple of things I changed the sender for a new one but this did not solve it.

Your suggestion of testing the sender is a good idea. (easer said than done, one of the joys of working on a Lotus), however an old and a new sensor having the same failure/problem seems unlikely but ........................


Esprit Freak

Link to comment
Share on other sites

  • Moderator

Your findings point to a bad connection somewhere, as a higher resistance will give a higer reading. Did you check the wire from the sender to the gauge? Or the connector to the sender?


I have made many mistakes in my life. Buying a multiple Lotus is not one of them.


Link to comment
Share on other sites

The measurements were taken with the whole cabling. I removed the connectors from the sender and hooked the potentiometer up to the connector and the ground to the engine. With me sitting in the back and adjusting the potentiometer, my girlfriend was sitting in the front reading the gauge and writing down the corresponding resistance value which I measured after setting the needle on each whit / red stripe on the gauge.

So the cabling looks ok. 

Esprit Freak

Link to comment
Share on other sites

  • Moderator

Maybe a bad fit of the connector to the sender? Seems to be the only item left...

I have made many mistakes in my life. Buying a multiple Lotus is not one of them.


Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

  • Create New...