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Got a full cylinder ,,however 2 different pressure gauges and both are reading 0,,what am i doing wrong?

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6ya6ya
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Posted on Jan 02, 2017

jmassengill
  • 345 Answers

SOURCE: OIL PRESSURE LIGHT COMES ON AND PRESSURE GOES TO 0 ON GAUGE

Any time the oil pressure is 0 you take a chance of locking up the motor. The only way to know for sure is to put a pressure gauge in the oil pressure sending unit port on the engine and see what the pressure really is. At that point you will either have the peace of mind in the knowledge that the sending unit is really bad and needs replacement or you can then contact a repair shop and tell them what your testing has revealed. I wouldn't drive or run your truck while the oil pressure is at zero.

Good luck

Posted on Nov 10, 2008

  • 1114 Answers

SOURCE: oil pressure high

could be oil pressure switch in eng block ??engine light on? if so scan it for fault codes retreve and start looking for dealer explanation perhaps

Posted on Jan 03, 2009

  • 1201 Answers

SOURCE: 4.7 liter oil pressure gauge malfunctioning.

Check or replace the oil pressure sending unit.

Posted on Feb 25, 2009

  • 316 Answers

SOURCE: The oil pressure gauge keeps dropping down to 0 while i am driving

If you don't hear any ticking or knocking while the pressure gauge drops, the problem is probably a failing "oil pressure sensor". If you do hear a ticking or knocking, the problem is probably a failing "oil pump".

Posted on Jun 03, 2009

  • 60 Answers

SOURCE: daewoo racer 1995, petrol gauge

the easiest fix is to change the sending unit

Posted on Oct 22, 2009

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1 Answer

Tank empty, gauge reads 1/4, tank full, gauge reads full, tank 1/4 full, gauge reads 1/2. Engine off, gauge reads below empty. Any ideas will be welcome.


The values differ in all types of cars. Older cars peg out at 90 ohms. Newer cars range between 0 and about 400 ohms. Dis-connect the connector at the sender. Ground the sender wire and the gage should read empty. un ground and it should read full. They use a ceramic resistor in the tank that usually go bad.

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I have an oil pressure gauge that reads in analog, 0 to 150? something like that, any way, it moves like a tachometer, idle down around 10, revs up to 55, 60 when taking off and then settles down at 35 while cruising, I notice a change with heavier oil. Also, I know it will read 55 lbs pressure with 1 qt of oil in there, I tried it. So the pressure gauge has nothing to do with amount of oil in engine. As long as it is full, It should be ok, as long as it is reading pressure, but if the pressure drops off, shut it down and find out what happened, If it loses all the oil, the temp light should come on long before the oil light.

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There is had start and heating up of the engine number RJM 510253 Engine 4JX1 Chassis: USB 73GW7202143 I am in Zambia and I have tried everything I can but the problem is not going out


Try a compression check of every cylinder. A blown head gasket could be the result. 1. Remove the coil wire. 2. Remove a spark plug wire and plug. You should do 1 at a time. 3. Install a compression gauge. 4. Have a second person crank the engine until the gauge is at the appropriately rated pressure and write it down. 5. Do this with each cylinder. 6. Compare the readings on each cylinder. Every cylinder should be about the pressure. Of course engines with a lot of miles can normally have a little difference in pressure,but not too much. The one with the lowest reading could have a bad head gasket,resulting in overheating,and hard starting.

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According to what I read, test the gauge first. Hook power to where the white wire attaches. Hook a ground to the black wire connector. The gauge should rise to full. (May take a while). When on full, the tan wire connector to same ground. It should go to empty. If both work, gauge is good. To test sender, in the empty position, your ohm meter should read 0-2. 1/2 tank should read about 40, and full should read 84-88 ohms.

May 17, 2010 | Cars & Trucks

2 Answers

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if the gauge starts a 0 - goes to 1/2 , than full - sounds like gauge is OK - seems to me like the sending unit is bad - you could try removing the sender and trying to clean out the port with "brake clean", letting it dry than re-installing it. the pressure switch is still the least expensive place to start

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1 Answer

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These cars are funky and this is normal...gauges on all of the earlier cars are for general reference...checking the oil level manually while the car is running and warmed up is the most proper way to do this...generally speaking, your pressure should drop as the car warms up, but still reach 5 bar on full accelleration (928's have the same gauge). The oil level gauge will actually increase as the car warms up...the difference can be dramatic.

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sounds like you need a new head. valves may be bent.

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1 Answer

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When the gauge is at 0, is there any noise from the engine (tick, knock etc?) I would have someone put a mechanical gauge on there and read true pressure.Your driving pressure seems OK but if the low number is "real" something is wrong!

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1 Answer

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buy a cheap manual oil pressure test gauge from a parts store, not the kind of guage you put under the dash but a tester, they come with different fittings for may app's, they are about $20, being sure of the pressure is worth that, if the pressure is ok then most likely the sending unit is defective.

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