Question about 1987 Chevrolet Blazer

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I have two sending units on the housing for the oil filter and the top sending unit started leaking real bad. This is on my 1987 S-10 Blazer 4X4 with a 2.8 V-6

My oil gauge reads 0 to 80 psi and then the gauge starts to bounce real bad. The big sending unit is on the bottom and the smaller one sits above that. the oil started leaking out of the small one. the oil filter didn't have any oil in it. I put oil on the valve in the oil filter and it didn't drain down. the inside of the filter looked like new and I never had that problem until i changed oil this last time. this is the first time that this happened to me. I'm not sure what is wrong or how to fix it.

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  • 347 Answers

Well, first off would be to replace the faulty sending unit so that the oil pressure will stabilize. Second, if I'm reading this correctly that you have no oil in the oil filter at all? If not, your oil pump could be quitting or it did quit. It's recommended not to start the truck until it can be checked for oil pump operation. Have the valves been chattering badly? The only 3 things that would prevent oil from getting to the oil filter are a blocked passage, a failed oil pump or no oil in the motor at all. When the oil guage has that fluctuation is when the pump is going out or again the engine has no oil or a leak so massive that the guage can't hold a stable reading. Good luck

Posted on May 11, 2017

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Posted on Jan 02, 2017

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SOURCE: no oil pressure

REPLACE YOUR SENDER, . REPLACE FILTER , YOU MAY HAVE CROSS THREADED, DID YOU OIL PAINT THE GASKET.? CHECK THE FILTER HUB FOR DIRT, GRAVEL, OLD RUBBER, ???????

Posted on Sep 20, 2008

emissionwiz
  • 76164 Answers

SOURCE: oil psi gauge reads well over 80 when engine is

no this sounds like a defective gauge, a sending unit cause this symptom

Posted on Oct 20, 2009

  • 3600 Answers

SOURCE: oil pressure gauge at 0

It is a possibility but I would check for sure. The oil gauge on that unit is electric not mechanical, you need to remove the sender or find a oil hole port on the side of the block and test the oil pressure to be sure it has oil pressure, if it is then it could be the sender or the wires going to the computer control. 2005 may be under warranty, however do not drive it till you know for sure. I don't remember if they still had the kill switch on that year or not, if the switch was reading zero the engine would not start so it could be something simple like a corded wire or as you said the sending unit. Hope this helps and if you need more help write back or do a chat or e-mail to get more help. You can look up the part at www.advanceauto.com and see what it looks like and get the price list for the thing and look to see if it has one two or three wires before you ever open the hood. if it's a three wire it has a kill switch if it's two it's not. if it's one it gets the signal from the computer and your problem may be the computer. However I don't know if it is still under warranty or not and weather you want to fix it or not. Let me know if you need more help. If you need the procedure for removal please respond to this post. Thanks for using fix-ya. I hope this helped.

Posted on Dec 28, 2009

  • 1608 Answers

SOURCE: oil pressure gauge is reading 80 psi. I had the

The oil sending unit is located on the engine block behind the drivers cylinder head area.You have to climb up on the motor to see it cause it is hard to see behind the wiring harness.You may also want to purchase a new sending unit because it is very long and you might need to buy the sending unit socket to replace it.Hope this helps.Good luck.

Posted on Jul 20, 2010

  • 154 Answers

SOURCE: when you start the car it starts leaking oil right

make sure the oil filter doesnt hav 2 gaskets sumtimes the old filter gasket will stick to the engine and if it double gasketed it will leak

Posted on Mar 11, 2011

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