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1988 Nissan 300ZX oil pressure only 15-20 lbs

Oil pressure gauge reads only 15-20 lbs

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A failed oil pressure switch-- most likely

I would verify the pressure with a mechanical
gauge on motor--- then replace the press sw

Posted on Dec 01, 2012

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Posted on Jan 02, 2017

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daltonp
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SOURCE: 1984 nissan 300zx oils pressure gauge goes to

Sounds like an electrical problem, make sure the ground leads to the engine are good and the battery terminals are clean. It might just be a bad connection in the wiring harness try jiggling the connections to see if it makes the gauges jump when it is running.

Posted on Jul 20, 2010

  • 94 Answers

SOURCE: have a 1986 nissan 300zx V6 non turbo wont start,

a oil gauge reading maybe delayed until car starts and builds good oil press.Did you check for spark
was car running good before this happened? Do you have a rpm reading when cranking car?

Posted on Nov 02, 2011

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Have a 1986 nissan 300zx V6 non turbo wont start, hear fuel pump runnung no oil pressure on gauge replaced oil pressure unit still wont start any helpful advise


a oil gauge reading maybe delayed until car starts and builds good oil press.Did you check for spark
was car running good before this happened? Do you have a rpm reading when cranking car?

Nov 02, 2011 | 1986 Nissan 300ZX

1 Answer

The oil pressure lite came on oil is full slow revs cause drop in pressure


The first thing to determine is whether the oil pressure sending unit is bad or the engine actually has low oil pressure. To determine that you can remove the sending unit and adapt a mechanical oil pressure gauge in the hole. You should have a minimum of 20 lbs. pressure at idle and 40 lbs. above 1,000 rpm on a warm engine. If the pressure readings are good, replace the sending unit; if not, you have an internal engine problem.

Aug 01, 2011 | Buick Electra Cars & Trucks

2 Answers

My 2005 Nissan Armada is reading oil pressure abnormally high. The gauge is maxed out.


  • Well it could be a bad oil pump or a bad Oil Sending Unit. If you have an oil pressure gauge you can pull the sending unit and stick the pressure gauge in there and see what the reading is. I would thing 60PSI would be suitable.
  • I believe this Oil Sending Unit is on the front (possibly the back) of the oil pan.
  • Just remove the connector and put a wrench (or a deep socket) and twist it out and replace with a new one.
  • Make sure the oil filter is snug and not leaking as well.
  • Check your oil level too and make sure it is properly filled.
  • Good luck and thank you for using FixYa.

Regards, Tony

Jun 13, 2011 | 2005 Nissan Armada

1 Answer

I have a 99 suburban 350 5.7 vortec the engine was just rebuilt and it has 3-5 lbs of oil pressure and drops to zero at ide (mecanical gauge) we replaced the oil pump last night and still has the same...


have you had the gauge tested to do go out of range over time. it could just not read lower readings i would check this before anything else, rule out the gauge having a fault.41 lbs PSI hot and ~55 lbs cold based on the dash gauge should be around these figures plus or minus, could also check vacuum lines for the engine breather. if i remember these also adjust the pressure as well.

Aug 10, 2017 | 1999 Chevrolet Suburban

1 Answer

I am interested in purchasing a 1986 nissan 300zx. During test drive I noticed oil pressure stays close to zero and when accelerate, drops to zero and rises back up to quarter of way up what could problem...


Your going to buy a 24 year old vehicle,correct?
I would say okey, if your doing a ground up restoration, all by yourself,because you really know how to do that.

Could be an oil pressure sensor gone bad. Need to check pressure with a mechanical gauge.

What in heavens name are you doing at a dealer?
Have you lost your mind?
Please don't tell me, buying a 24 year old vehicle?

Aug 04, 2010 | 1986 Nissan 300ZX

1 Answer

1984 nissan 300zx oils pressure gauge goes to


Sounds like an electrical problem, make sure the ground leads to the engine are good and the battery terminals are clean. It might just be a bad connection in the wiring harness try jiggling the connections to see if it makes the gauges jump when it is running.

Jul 20, 2010 | 1984 Nissan 300ZX

1 Answer

Oil Pressure blinks at idle


First you need to hook up a manual gauge and see what the pressure really is.If the pressure is good [30 lbs or so] check the sending unit.If the pressure is bad and it is a 2.3 engine,they are well known for wearing out the cam bearings.Good Luck!

Mar 22, 2010 | 1988 Ford Ranger

1 Answer

Oil pressure gauge reads 40 or half pressure


on general motors engines all the way down to 15lbs of oil pressure is acceptable i prefer 30 but if the 40 you have down is the lbs of pressure your in good shape brand new engines generally only have about 45lbs of pressure

Mar 16, 2010 | 1994 GMC Suburban

5 Answers

99 Jeep Grand Cherokee 4.7 Oil Pressure reads 40 PSI at Idle and drops to 0 at higher rpms. I just changed the Oil Pressure sender/ Same Problem


If you got the same oil pressure reading with the new and old sending unit, more then likely your oil pump pick up tube is clog up, remove oil pan and clean or replace pick up tube also replace pan gasket.Goodluck.

Dec 22, 2009 | 1999 Jeep Grand Cherokee

1 Answer

I have a 1986 nissan 300zx non turbo. oil prssure will not build up. keep addin oil but all its doing is smoking out the exhaust. acts like the strainer on the fuel pump might be stopped up. can i clean...


Dear number601513: DANGER!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Adding oil is not going to make the oil pressure build up by adding more. The system is slightly more than a 4 qt system with an oil filter change. By adding oil, you raise the levels in the engine to areas where it is not designed to collect. Consequently, it is prone to leaking and can smoke by picking up oil through the pcv.
The fuel pump has NO relationship to it's oil pressure. The only relationship would be through providing enough fuel to power the engine speed above 600 RPM which would and should be more than adequate speed to drive the oil pump. The oil pump on the VG-30 is located at the front of the engine and is the last component which is installed prior to to installing the timing belt gear. The pump is crank shaft driven, so it is a positive drive unit and not very prone to failure. The oil pickup tube which is bolted to the bottom of the pump, is sealed by an "O" ring. This is a probable place for it to loose prime. The screen at the bottom of the pick up tube could be full of sludge which limits the flow of oil, thus keeping the oil pressure dangerously low. One suggestion prior to condemning the engine oil pressure, is to do a mechanical oil pressure test. You can remove the oil pressure sending unit and screw a mechanical oil pressure guage in it's place. The threads are not metric, but NPT tapered design. You can buy mechanical oil pressure gauge kits relitavely cheap and make a test tool with one. Due to the fact that the oil pressure gauge is electric, they can give misleading readings. If your readings are down in the 8-10 PSI area @ idle this is bare minimum, when you raise the engine speed, the oil pressure should reach 40-60 PSI. Make sure you bleed the air out ot the oil line going to the gauge beause "AIR" compresses and will give you a false reading.
I hope this is informative. Good luck.
PS, I'm the new guy on the block here in "Fixya" if I've helped you out, please write back in to let them know. THANKS>>>>>>>>>9

Mar 09, 2009 | 1986 Nissan 300ZX

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