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Old 12-16-2011, 04:59 PM   #1
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Default No Oil Pressure After Replacing Water Pump

Does anybody have any idea why my dash gauge would show oil pressure all the way down?
I had oil pressure registering before replacing my water pump.
Any help would be greatly appreciated, as I need to drive the car tomorrow, and I am worried if there really is no oil pressure that will end catastrophically.
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Old 12-16-2011, 05:12 PM   #2
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Possibly pulled the wire off the oil pressure sensor located just above the oil filter, or even damaged the sensor. Take a look.
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Old 12-16-2011, 05:20 PM   #3
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I see, my PS Pump knocked it off, or maybe broke it?
If it screws in the chances are I broke it, I'll try to get pics of what the sensor looks like as it is now.
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Old 12-16-2011, 05:23 PM   #4
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Ya, check the oil sender unit. It sticks out and can be broken easy. https://www.gmforum.com/trouble-shooting-test-procedures-141/oil-pressure-sensor-location-284737/
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Old 12-16-2011, 05:33 PM   #5
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Thanks for that link Danthurs, I broke it when I sat my PS Pump down on it.
Would it hurt to make a 6 mile trip to the grocery store before I can get this replaced, or would that be bad?
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Old 12-16-2011, 05:34 PM   #6
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Am I going to have to drain my oil to replace this?
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Old 12-16-2011, 06:09 PM   #7
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No problems at all. It only reads the pressure, not control it.

No need to drain the oil. A small amount will come out.
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Old 12-16-2011, 06:14 PM   #8
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Sweet, good to hear, thanks for the help Dan!
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Old 12-16-2011, 06:24 PM   #9
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Question, do you know of anybody that has had success using the cheaper sensors?
Like the Airtex/Wells, or SMP one?

I ask because I read some had issues with inaccurate readings with non OE AC Delco sensors, so I'd normally just get the OE one, but money is beyond tight, so if I can get the sensor for around 20.00 instead of 40.00 my wallet would be happier.
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Old 12-16-2011, 06:54 PM   #10
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Any should be fine. It'* only giving you a reading, that is all. You want accurate, you will need a mechanical gauge.
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