Oh for the love of F@#%! ... the oil switch again

[col.decker]

I've been sufferening for a few weeks with the buzzer of doom, which would go off at seeminly random times. Steady speeds, straight lines, flat roads etc. I put it down to a faultly high/low oil pressure switch (the top one by the water pump). Any ways I changed it a couple weeks back for a new grey one and all has been well since.


then today


oil light came on and started flashing, but no buzzer (Oil level is OK). Wiki suggests that I may have put the wrong switch in, maybe I should have used a White one. I'm thrilled at the prospect of changing it again as the switch is located in such an easy & convient access area.






you may now point and laugh

[col.decker]

or could it be that the switch is fine and something else is going wrong?

[Ian Hulley]

Check the condition of the terminals in the white junction where the brown wires connect to the engine bay loom at the front left near the t/stat housing. Mine were green and furred up creating high resistance and thus causing false signals.

Ian.

[itchyfeet]

At what revs iirc the revs need to be above 2000 rpm to trigger the buzzer

Did you change the cable over the engine and fit new crimps?
I had the same once and this cable measured ok with a multimeter but was intemittant changed it and it was ok

Id leave the grey switch i hope it wasnt from gsf?

[itchyfeet]

Does it only happen with the stereo on?
Im thinking the 18 inch subwoofer could be affecting it

[col.decker]

Check the condition of the terminals in the white junction where the brown wires connect to the engine bay loom at the front left near the t/stat housing. Mine were green and furred up creating high resistance and thus causing false signals.

Ian.

roger that. Will check at lunch time

[col.decker]

At what revs iirc the revs need to be above 2000 rpm to trigger the buzzer

Did you change the cable over the engine and fit new crimps?
I had the same once and this cable measured ok with a multimeter but was intemittant changed it and it was ok

Id leave the grey switch i hope it wasnt from gsf?

Came on when I was driving (about 40mph) so above 2000rpms. Also stayed on during tick over. I changed the crimp but left the cable as was. Though thinking about it I had to extend the wire to the low/low switch as I re-fitted it via a hose and t-bar so that I could add a dashboard oil pressure gauge and switch, and I only joined the wires by terminal blocks. Maybe its become disconnected ... probably not as that would be too easy to fix

It will be a busy lunch time today

[Ian Hulley]

Check the wire to the low pressure switch hasn't rubbed through against the pushrod tube guards ... another common occurance.

Ian

[itchyfeet]

I have a feeling that if the low pressure switch contacts to ground the light us on constantly not100% sure though

[richlaz]

Low pressure to ground is indeed a constant light (I've been pottering about with mine for weeks lol )

[col.decker]

hmmmmmm interesting ...



I've just been for a poke about. Oil level is still ok, no signs of any leaks ... well ... no more than normal. But the wire I re fitted for the low low sensor has slipped from its cable tie a bit and has been resting on the exhaust manifold. Resulting in a few spots where the wire insulation has melted.

Hows this for a theory: both sensors are fine but the wire for the low low is shorting out on the exhaust / engine and going to ground, hence the warning light.

I just ran it for about 10mins and the light didn't come on once, but the wire was well away from the exhaust / engine.

[col.decker]

Though from reading posts above that would give a constant light on not a flash. Grrrrrr

[Ian Hulley]

Though from reading posts above that would give a constant light on not a flash. Grrrrrr

That would explain the flashing light and no buzzer.

Ian

[itchyfeet]

Maybe your tacho feed wire is also a bad connection buzzer needs this to know you are over 2000 rpm so it thinks you are at idle and so just flashes the light
http://www.brick-yard.co.uk/VehicleSpec ... fo/dop.htm" onclick="window.open(this.href);return false;

[col.decker]

tacho speed feed, I hadnt even thought of that, good call. The drive home went without any problems