Question about 2000 Honda Civic

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Oil pump - 42kmls

This car has done 42k mls. No oil pressure at all, oil pressure light stays on continually, checked oil pressure switch and that's ok removed oil filter to check whether oil was circulating up to this point and found it was not. Checked relief valve, plunger slightly scored and found that the inside of the cylinder has a 2mm half moon shape chip at the edge.
Should I examine the pump? or what would you advise, are there any other checks I could carry out before taking the pump off.

Please reply via email to susan.buckley1@tesco.net

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I am having the same issues. I am about to check the relief valve myself. There are two remaining factors for you the actual pump or the little ol o-ring on the back of pump that seals oil pump tube to block. If it is bad or blown you will not build pressure. I am not sure if it would cause a no pressure issue though. Good luck...

Posted on Aug 24, 2008

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Posted on Jan 02, 2017

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Where is the oil sending unit on a 1996 mercury cougar xr7 ? Its cause my oil pressure gauge is bouncing up and down...i dont know why...can anybody please help me thank you so much


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The low oil pressure warning lamp will illuminate anytime the ignition switch is turned to the ON position without the engine running. When the engine is running, the light also illuminates if the engine oil pressure drops below a safe oil pressure level. To test the system, perform the following:
If the oil pressure light does not work, perform the following:
  1. Turn the ignition switch to the ON position.
  2. If the lamp does not light, check for a broken or disconnected wire around the engine and oil pressure sending unit switch.
  3. If the wire at the connector checks out OK, pull the connector loose from the switch and, with a jumper wire, ground the connector to the engine.
  4. With the ignition switch turned to the ON position, check the warning lamp. If the lamp lights, make sure the oil pressure switch is properly grounded in the cylinder block, and if so replace the oil pressure switch. If the lamp still fails to light, check for a burned out lamp or disconnected socket in the instrument cluster.
To diagnose an oil pressure light that stays on, perform the following:
  1. Check the engine oil level and top off as necessary. If the engine was 2 or more quarts low on oil, test start the engine after topping off the oil level and recheck the oil pressure light operation. If the light stays on, stop the engine immediately and go to the next step.
  2. Disconnect the wire at the sending unit, then turn the ignition switch to theON position. If the light remains on, check the wire from the sending unit to the gauge for being shorted to ground and repair as necessary. If the light goes out, turn the ignition switch OFF and go to the next step.
  3. Replace the oil pressure sending switch with a known good switch.
  4. Start the engine and check the oil pressure light operation. If the light stays on with the engine running, stop the engine immediately to avoid severe engine damage until the cause of the problem can be determined.

WARNING
If the oil pressure light remains on while the engine is started, stop the engine immediately. Do not operate the engine until the cause of the problem can be determined. Operating an engine with low oil pressure will cause severe internal damage.

Possible causes for an oil pressure light to stay on are:


Pinched or grounded sensor wireDefective oil pressure sending unitRestricted or severely leaking oil filterExcessive internal engine bearing clearance.Insufficient or severely contaminated engine oilBlocked oil pump pickup screen or severely worn oil pump

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This is usually done via the oil pressure switch hole. It the engine has fewhoudrs then the oil bypass valve is stuck in the open position.
This is located inside or as a part of the oil pump itself.

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1. Oil contaminated by fuel, and thin due to fuel injection system problems, and fuel draining into sump.

( How long ago did you last change the oil and filter ? Usually about....1 Yr or 12.OOO Mls)
Wipe oil from engine dip stick on tissue, and smell it for fuel !

Have you noticed you use a lot of fuel lately, and the car blows black smoke from exhaust on hard acceleration ?

2. Oil Warning light transmitter faulty. ( The Most Common !)
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If I were you, I would change the Oil and Filter, and renew the Oil Warning Light Transmitter, and go from there.
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Good Luck !

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Cheers John

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