Shadowfax

I am getting intermitent dash light and buzzer action from the "oil can" icon on my '85 4KQ. Is this low oil preasure or oil level? What sender controles this function? Car runs fine with no tappet noise or knock but the buzzer going on when I accelarate is anoying.
Help

hals86cgt

Finally after checking the oil and it was always fine, I just yanked the damn relay... Maybe someone has a real solution..LOL

Hal

Katman

Oil pressure controlls buzzer, *IF* everything is working correctly.

THere is an "Oil Pressure Controller Module" that looks at two oil pressure switches (lower front left of block), and engine rpm.

At lower rpm, controller looks at low pressure sender. At higher RPM, controller looks at the higher pressure sender.

And.. As far as I can tell, the pressure sender turn ON when pressure is high, as opposed to most pressure senders that turn on when pressure goes low (and turns on a light).

That would also then make the controller 'buzz' if a connection to an oil sender came undone or was intermittent..

4corners

If the buzz and light go away as the rpm's raise you are looking at the low pressure sender going south on you. My diagnosis anyway. This is very common and cheap to fix.

Blewtoon

What happens if the wires get switched around?

Katman

Well... At low revs, the control box would be looking at the high pressure sender, which *probably* would still be off.

So the controller would buzz until you got the revs up enough to have oil pressure close the high pressure sender (which the control unit thinks is the low one), or until the revs hit the transition point that the control box looks at the high pressure sender (which is now the low pressure sender).

The low pressure sender better be closed by now!

Katman

Probably... "Buzzzzzzzzzzzz" !

Katman

As the high pressure sender won't be closed, at low revs..

Shadowfax

Thanks,Frank It fixed itself so it must be a bad connection to one of the senders.