Question about 1991 GMC C1500

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I have a bad oil pressure switch on my 1992 gmc pickup (4.3) and need to know what tools and what parts needs to be removed in order to get to the switch?

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  • Harvey N Tawatao
    Harvey N Tawatao May 11, 2010

    You can remove the oil pressure sending unit with a common channel locks or an adjustable wrench. The unit is located just behind distributor on the engine block, just un-clip the wire leads and then replace the oil pressure unit. Good luck and don't use Teflon tape on the new unit, the unit needs a good ground.



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You should not need to move anything to get to it. It will be on the lower driver side of the engine. The oil pressure switch looks similar to a spark plug sticking out of the engine block. The switch simply screws in with an end wrench and the old one comes out the same way. There is a single wire attached to the end that simply pulls straight off and slips back on the new one. Hope this helps. Good luck.

Posted on Nov 13, 2009


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08 gmc 5.3L vortec 193K daughter drove it tues night, wed morn cranked it, NO oil press. sounds bad! oil pump O-ring, pressure relief, crank bearing? always changed oil @ 5000 miles or less

Has it any oil in it at all?

If the oil level was low heavy cornering and braking can cause oil swill away from the pump pick up robbing the engine of oil pressure for a few moments. At high engine revs it takes only a few seconds for permanent damage to be done.

Some vehicles use a steel oil pan that is quite exposed and if grounded the oil pan can be bent upwards and close off the oil pump inlet.

It isn't unknown for an oil pressure relief valve to stick open but that is unlikely remove all oil pressure from a healthy engine when cold.

Clearly there are some careful checks needed but if the engine sounds bad the damage was probably done Tuesday night so a crankshaft and bearing overhaul is probably needed...

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I have a 92gmc sierra 4. 3 L do you have to pull the distributor to change oil pressure switch

no you don`t. just use the proper tool to get access to the switch.

Mar 18, 2015 | 1992 GMC Sierra

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I have a 1989 gmc s-15, I need to replace the oil pressure sensor, what size socket do I need?

well go to auto parts store buy the oil pressure sending unit then while you at auto parts store you can take new oil pressure sending unit try different size sockets to find the correct size socket you need.

Oct 27, 2013 | 1983 GMC S-15 Pickup

1 Answer

Where is the oil pressure sending unit on a 1987 gmc s15

  • You should have two of them (which went to one in think 1991 or 1992)

  • The sensor by the distributor is for the oil pressure gauge - see pic below.


  • The sensor by the oil filter worked with the fuel pump power circuit see - pic below.


  • If you have any comments please feel free to leave them here.
  • Hope this helps and thank you for using FixYa.

Regards, Tony

Oct 02, 2011 | 1987 GMC S-15 Pickup

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I have a 1991 GMC C1500 5.7L 350. oil pressure switch

Hello! Let's make certain we are talking about the same item...You are changing the oil pressure sender; Correct? It has a single wire (Gray in color) and is located near the distributor; It is a lot easier to remove if you pull the distributor...Don't forget to mark the position of the rotor...


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How to change ignition switch on 1992 gmc sonoma

Remove the kick panel covers, the lower portion of the dash, remove the lower half of the covers on the steering column. You will have to cut about 3 or 4 wire ties.

You will need a special tool to remove the bolts from the existing ignition switch, (it looks like a reverse torx screw). To remove the other end of the existing Ignition switch cable you will need a nut driver to remove the connector.

Remove the two additional connectors on the outside of the connection. Re-install the additional connectors onto the new switch harness. Connect the adaptor and tighten the bolt. install the switch and tie the harness back into place. replace the cover and Dash panels.

Apr 10, 2010 | 1992 GMC Sonoma

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You could always run a fused wire from the fuse panel to the relay. This way when you turn the key, power goes to the accessory on the fuse panel, the fused wire you installed, and to the relay circumventing the problem and creating a protected circuit.

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What does a low oil pressure alarm mean

It means the sensor that detects your oil pressure has seen a situation where the oil pressure is too low and engine damage will result. Could be just a bad sensor, but better have it checked with a mechanical gauge to see exactly what the pressure is.

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first you need someone to verify the oil press . they will remove the sensor install manual gauge and see what it is. if it is that low at idle the either the motor is very dirty or pump is going bad.

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Oil pressure switch

Pressure switch is usually located near the oil filter and generally has two wires on it. Best way to check it is by putting a manual oil pressure gauge in it's place and reading actual oil pressure. If your symptoms are no oil pressure reading or abnormal readings, with no tapping noises (or worse) from engine then it likely is the switch. Most require a special socket to remove but the sending units are not terribly expensive.

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