Intermittant Oil Light

[Dangermike]

Good Morning all

So for the last month or so i have been having an intermittant oil light, normally comes on a few minutes into the drive and then will turn off again after a while, sometimes may come on again, Sometime wont come on at all.

Tackled the first task of replacing the pressure switch yesterday, unfortunately this do not seem to fix it, (also cleaned the connector while i was there)

While i had the switch out i tested the oil pressure, started off at low revs just over 60PSI then went up to about 85PSI on high revs,

Trying to think of the next steps i can do at home before taking to Garage, i am fairly competent at doing most jobs, i mean i have replaced valves and head gaskets in passed, as well as the OIl sump on my Landy.

Just never had a fault like this before,

Any ideas on next steps?

[willow2u]

Did you test it with old style capillary oil pressure gauge

[g8dhe]

Your aware that the light is driven both by the Pressure and the Level switches ?

Might be worth checking both of them the other possibility is an earth on the signal wire back to the dashboard ofcourse.

[Dangermike]

Hi,

Yes was aware there was the level switch in line as well. was not sure if there is away to test it other than replace it.?

With the signal wire i take it i can disconnect from pressure switch and drive with a DVM testing continutity against ground. to see if it grounds out ?
then can replace cable, or try find the break.

[g8dhe]

Indeed, the light coming on itself with both sensors disconnected would prove that alone. Use a meter to monitor one of the sensor switches to see if it closes once your running then it would point out which sensor is operating or if there is a fault on the wire.

[Dangermike]

Thanks!

So update!

I unplugged both sensors and the Oil light didn’t even come up with the Test at the start,

I plugged in the pressure sensor again and the oil light did the test at start up.

I left the level switch unplugged, and drove it around. And the light did not come back on!
So am I right in thinking that the switch if oil is low would then connect the cable to ground causing the light to come on?
So if it’s not on now it’s likely to be the level switch?

The connector is actually full of oil, seems there is a leak above it some where so maybe the oil in the connector can cause fault grounding?

[g8dhe]

Yes the level switch should make when the oil level falls to low .... you have checked the oil level ..... ?

[Dangermike]

Perfect thanks, so good news for me!
Yes first thing I did, was over half way between min and max,

Will clean up all the oiled up connectors tomorrow, and recheck and hoping for smooth sailing!
Also will look as to where that oil is leaking from!