I have found an oil pressure sending unit at the parts store. I can not find the sending unit on the engine. 1999 GMC Jimmy. Could not find it in the repair manual either. Do you know what area to look in to locate the unit on the engine?
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I have done this on a 2003 Odyssey EX. The oil pressure switch is located on the oil pump assembly, which is behind the passenger side front wheel. There are 2 sensors - the oil pressure switch is the furthest one and least accessable. You need to pull off the connector, which is very tight. I used a pair of pliars with a cloth to twist it off. Be carefull not to damage the connector. There are 2 different switches available for the 2003, each with different tread sizes. I used a regular wrench to remove/install the switch, and it stopped the leak that prompted the repair. Another TIP: watch how long your wrench is, because you can catch the power steering pressure switch wiring harness and break the thin wires, leading to a much more expensive repair.... Next time I will disconnect the power steering pressure switch first and pay more attention. Or buy a shorter wrench.... Good luck!After you remove take to Auto part store and match up with a new one.Adeep well socket may also work.here's another site I found on removing.
Locate the oil pressure sending unit on the engine.
Note the anti-theft code and radio presets for the radio.
Disconnect the negative battery cable.
Disconnect the sending unit electrical harness.
Using a pressure switch socket, deep-well socket or wrench, loosen and remove the sending unit from the engine.
Apply a liquid thread sealant to the sending unit and install the sending unit in the engine and tighten securely.
Attach the electrical connector to the sending unit.
Check the engine oil level and top off as necessary.
Connect the negative battery cable.
Enter the anti-theft code and radio presets for the radio.
Start the engine, allow it to reach operating temperature and check for leaks.
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.
Remove the sending unit on the engine and check the oil press with a test gauge, if the oil pressure is good on the test gauge replace the oil press sending unit on the engine. Note the removal and installation of the sending unit requires a special socket, that is available at any auto parts store, you will likely need the deep version of that socket for a Chrysler product.
Sounds like you have a bad oil pressure sending unit, the oil pressure sending unit controls your oil pressure gauge, what I would do is remove the oil pressure sender and hook a manual oil pressure gauge up to your engine and verify you have sufficient oil pressure, if you have good oil pressure on your gauge then replace the sending unit, if you have a low reading on the gauge stop your engine immediatly and start looking at a potenial problem with your oil pump or lubricating system within the engine....
Start by verifying the oil pressure sending unit. It is quite common for a bad sensor to act erratically, such as you have described. Acquire an oil pressure gauge and install it in an appropriate location, perhaps in place of the oil sending unit if a more convenient location is not available, and run the engine. Observe the pressure on the test gauge at various RPM and over a period of several minutes as the engine warms. If pressure on the gauge is good, then you have a problem either with the oil pressure sending unit, in the circuitry, or instrument panel gauge. However, the problem is most likely the sending unit. Note: the sending unit often requires a special socket, which may be obtained at any auto parts store. Also, if you don't own a test gauge or unwilling to purchase, many auto parts stores now rent tools, others even loan tools provided an adequate security deposit is made.
How many miles? Next oil change use Gunk motor flush this will remove any build up. Also check wire going to the oil pump sending unit. You might need a sending unit pod. Any parts store will have this.