You might want to print this reply out.
You narrowed it (the buzzing) down with a guess that it's the oil? I don't know what that means... low oil level, no oil to the VRO?
Did you rebuild the engine yourself or did you have a shop do it? If you rebuilt it, then you will remember installing a large black plastic object on the port (left) side of the engine that has three hoses attached to the bottom of it and one at the top that leads to the carburetors...... That object is the VRO fuel/oil pump of which I'm sure you HAVE NOT primed the VRO pump properly (as follows).
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(Priming The VRO Pump)
(J. Reeves)
When hooking up or installing a VRO whether it is a new or original VRO pump, it must be primed in order to dispel any air that might be in the oil line.
Have the Oil line attached to the engine fitting BUT detached from the VRO. Add a piece of fuel hose if necessary to the oil line so that it can be aimed into some sort of container.
Pump the oil primer bulb, catching the oil flowing out of the line into the container until you are absolutely sure that you have rid the oil line of every bit of air that might have been trapped there.
Now, connect the oil line to the VRO and secure it. When the oil line is secured, apply pressure to the oil primer bulb ONE TIME only. That's it.
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DO NOT, after properly priming the VRO, feel that it is necessary to pump it again UNLESS the warning horn starts beeping every other second which indicates either air in the line or a VRO failure.<-- If this takes place, get back to us.
Pumping the VRO oil priming bulb at random times causes extra oil to be supplied to the carburetors... hard starting, excessive smoking, etc.
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I've never encountered any warning horn that would be beeping constantly and steady unless the engine was overheating (or in the case of a V6 or V8, a fuel restriction. However, check that three (3) wire horn to make sure the two slide on terminals have the proper wires connected.
There is a built in black wire that should be attached to a ground connection.
A Tan wire should be connected to the slide on terminal closest to that ground wire.
A Purple (12v) wire should be attached to the remaining slide on terminal.
Having these two wires reversed will result in weird happenings.
NO OTHER wires are to be attached to that horn.
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(VRO Horn Warnings)
(J. Reeves)
NOTE: I retired around 1991/92. Possibly some of the later V4 engines and others may also incorporate a fuel vacuum switch that would enable a fuel restriction warning to sound as mentioned below, an unknown factor to myself.
1 - A steady constant beep = Overheating - The V/6 engines, possibly some others, have a fuel restriction warning which is also a steady constant beep.
2 - A beep every 20 or 40 seconds = oil level has dropped to 1/4 tank. (Late model engine = Every 40 seconds)
3 - A beep every other second = VRO failure, air leak in oil line, oil restriction, (anything that would result in a lack of oil being supplied to the engine).
NOTE - If the warning horn is the black plastic (overpriced) three wire type horn, the warning horn should beep once when the ignition key is turned to the ON position. If it does not, it is either faulty or someone has disconnected it (a stupid move!). At any rate, if it does not beep which indicates that the horn is non functional, find out why and do not run the engine until the problem is corrected.
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Daily Engine Starting Procedure:
DO NOT pump the oil priming bulb..... Pump fuel primer bulb up until it is hard..... Apply just a slight bit of throttle to take the throttle butterflies off the idle setting (Remove the hood to get a idea how much movement it takes to have the throttle butterflies move.. Replace hood)..... Turn key to the START position and hold the key IN to energize the Fuel Primer Solenoid..... When the engine fires/starts, release the key to the ON (run) position.
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Testing the VRO for oil usage... Mark a line with a masking tape and magic marker, the tape so that you don't end up with a 100 markings or so on the tank... then keep a eye on that tank mark to see if it drops slightly or what!
Some temporarily disconnect the oil line and plug it, then attach a clear hose to the oil fitting, curving it upward, securing it somehow (tie straps, whatever), then filling it to a non spill point and marking that point with a magic marker. That'll tell you pretty quick is and how much oil is being used... BUT... keep in mind that after that test, the VRO will require "Priming" again.
If the warning horn is working properly, and if the VRO is faulty (no oil), the horn should beep every other second.
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