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Question on oil pressure sending unit

Old 08-20-2018, 08:14 AM
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EuroRod
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When this sensor fails, can it fail slowly by reading lower and lower pressures, or does it fail all at once? Had my car, with a new engine, on the dyno last week, and when finished, drove the car home and immediately noticed the oil pressure guage was reading 30 lbs lower than normal. Called my tuner and his response was that the sending unit was failing ???
No “death noises” coming from the engine. Cooland and oil temps normal.
BUT, I always thought when these sensors failed, they pegged to zero?
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Old 08-21-2018, 05:34 AM
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Originally Posted by EuroRod View Post
When this sensor fails, can it fail slowly by reading lower and lower pressures, or does it fail all at once? Had my car, with a new engine, on the dyno last week, and when finished, drove the car home and immediately noticed the oil pressure guage was reading 30 lbs lower than normal. Called my tuner and his response was that the sending unit was failing ???
No “death noises” coming from the engine. Cooland and oil temps normal.
BUT, I always thought when these sensors failed, they pegged to zero?
they can also peg to 80 psi when they fail.cheap enough to test if failing.replace with a new one and see what you get.I would be quite nervous about losing 30 psi oil pressure! Issues with o-ring in pick-up tube to oil pump can cause falling oil pressure especially in new builds.
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Old 08-21-2018, 06:06 AM
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I've only personally dealt with two oil pressure sensor failures. Both of them pegged high, not low.
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Old 08-21-2018, 09:58 PM
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schpenxel
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I've had one fail on corvette and one on GM truck. Corvette did the classic max out reading, truck went to 0 and would bounce back and forth sometimes reading and sometimes not (and setting off all kinds of alarms when it went)

So--change it and see what happens is my opinion.
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Old 09-14-2018, 01:40 AM
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tblu92
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As a failasfe setting when the sensors fails it is PEGGED to MAX
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Old 09-14-2018, 12:05 PM
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How is that a failsafe?
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Old 09-15-2018, 07:34 PM
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Originally Posted by EuroRod View Post
When this sensor fails, can it fail slowly by reading lower and lower pressures, or does it fail all at once? Had my car, with a new engine, on the dyno last week, and when finished, drove the car home and immediately noticed the oil pressure guage was reading 30 lbs lower than normal. Called my tuner and his response was that the sending unit was failing ???
No “death noises” coming from the engine. Cooland and oil temps normal.
BUT, I always thought when these sensors failed, they pegged to zero?
They pretty much work or they don't, I've never seen one start to read less than what it should.

If I were you I'd see about replacing it ASAP because if you really are 30psi low you've definitely got an issue going on internally.
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