84 s10 oil pressure switch

I will assume this is a 4.3 engine, the oil pressure /fuel switch is located on the rear of the engine next to distributor, what is the problem?

How much below 30 is it dropping? Oil pressure when in DRIVE at idle on a hot engine, is NORMAL at around 18 to 20 Psi. The warning lamp does not come on until around 7 Psi.

With that said, the oil pressure switch (for the light) is located on the lower left front of the engine. The fuel pump oil pressure switch and sender (for the gauge and fuel pump operation) is on the lower right front of the engine.

if your pressure is too low this fix is quite expensive and not worth for older cars, so the first thing you should try to keep it running is to use THICKER OIL (W20-50 or such), + oil stabilizier (any good oil additive). I tried it in my Jeep,- helped right away.. Good luck

Your 84 wiring harness is for the TCC ( transmission converter control) system.
On the left side of the carburetor (driver side) you should have 2 cables, one for the accelerator and the 2nd for the TV (throttle valve) control. You will need to adjust the cable for correct shift points. Under normal circumstances you will have 7 to 10 mm's extending beyond the cable adjuster block.
Should take care of the issue for you.
Let me know.
Regards,

Yes that switch will work. So will a lot of other parts and gaskets. You have to make sure the engine size is the same. Parts are compatible with the same engine size. Have a drain pan and new oil ready in case the oil does come flowing out.
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no should be same engine. check your engine mounts and tranny mount. how bad a vibration? sometimes after installing engine the trans gets shifted around and if mount was worn it will allow it to hit crossmeber and vibrate.

I have this problem on my 95 S10 blazer and found the switch on the dash was the problem.

Good luck
Rob

the problem is common for the 93-94-95 4.3 vortex its the spider injection located inside the plenum the part costs between $250 to 400 i had to replace on girlfreinds 94 blazer. ifound one o ebay for $100

just fixed that problem myself. it was an oil pressure sending unit. twelve dollar part. and i was thinking oil pump or something... 12 dollar part. oil pressure sending unit.

I had the same problem with 1991 s10 blazer.
check the oil pump pressure switch and current to the switch.
The computer will not allow the spark plugs to fire if the oil pressure switch is not sending a signal to the computer that the oil is flowing.
My problem was a short in the wiring that was not sending enough current to the oil pressure switch.
I had to crank the starter three or four times at 5 second intervals until the current was suffient to operate the oil pressure switch.
The switch is a round cylinder device located on th drives side of the engine near the oil filter.
Good luck!!