Hi all:  I have a 1993, 240 wagon, 

B230F engine, auto-transmission, 140,000 miles.

On a daily basis, after the car has warmed

up (10 + miles) the "Oil Pressure"


light on the dash will come on for about

a 1/2 second.  This occurs typically


when you have just come to a stop. 

Today the light came on for about 10 seconds


while driving.  I have done a number

of things so far.  They are:

  a.  All ground connections

where cleaned and dialectric grease used.


       (All

means the 12 or so around the entire vehicle)

  b.  Installed new oil pressure

switch/sensor at the block.


       (the

old switch only had 14,000 miles on it)

  c.  Disconnected the connector

to the oil pressure switch and connected my


       own

external light to the switch to rule out and bad wiring within the harnesses.


       Problem

still occurs.

  d.  Did an oil change and filter

about 3 weeks ago, but problem was there before the oil change.

  e.  Flame trap and PVC nipple

are clear (checked and cleaned during oil change)

  f.  Engine oil level is fine.

I'm stumped.  Based on the above I'm

assuming that I'm actually having low oil pressure.


Which I find highly unusual on this engine. 

Oil changes have been every 3,000 - 5,000 miles.

My next step is to take the oil pressure

switch/sensor out and put an


oil pressure gauge on the engine an watch

it.

The one odd thing I notice in the last

day or two,  my slow engine oil leak


from the rear of the engine (probably

a bad rear crank seal) which is maybe


5 - 10 drops per day, has seemed to stop

leaking.  I attribute this to 40 - 60


degree weather we are having here in Michigan.

QUESTION?

  1.  What is going on here?

  2.  Could high crankcase pressure

cause this? (there would be different symptoms).

  3. No crankcase pressure? (I don't

know how this would happen)

Any assistance

or ideas would be appreciated.

Thanks ...  Mr. Tool  (Two 1987

240 Wagons, One 1993 240 Wagon)