Replaced sending unit, still not working. What or where should I check next?
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Replaced sending unit, still not working. What or where should I check next?
Oil level? The gauge itself.
What year car?
Chris
The first thing I would do is screw in a direct-read oil pressure gauge (i.e. like a compression gauge that fits directly into the engine block and you look at with your head under the hood, similar to a vacuum/pressure gauge). If that reads okay, then it's something down stream, such as wiring, fuses, or instrument panel read-out). If the direct-feed gauge indicates low oil pressure, then the first thing I'd look at is the oil filter. There is a spring-loaded by-pass valve that can malfunction, especially on non-Miata brand filters. If changing the filter out doesn't do the trick, then you're probably facing tearing down the engine and looking at the oil pump, bearings or possibly a loose oil pump pick-up. All-in-all, I'm guessing it's in the wiring after the pressure sending unit. On my '90, I had a zero oil pressure reading and it turned out a mouse had crawled under the hood to keep warm (November) and had chewed through the wire from the sending unit.
It is a 1991 model. The person that I bought it from told me that it did not work but had oil pressure, drove it about 50 miles home with no issues.