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What would cause the oil pressure to go up and down on a1990 ford ranger

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  • Ford Master
  • 946 Answers

Low oil. Bad or loose sump in pan. Bad sending unit or gauge in dash(not likely the gauge).Bad or clogged oil filter. don-ohio

Posted on May 11, 2017

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Posted on Jan 02, 2017

emissionwiz
  • 75797 Answers

SOURCE: oil pressure sensing switch location

The oil switch is located on the passenger side of the truck in the back of the engine. Look for the transmission dipstick, then feel for it between the transmission dipstick and the engine block. It is hidden pretty well, but a socket wrench will fit to take it off. The new part uses a 1-1/16 socket, the old part for some reason was smaller, I think 13/16 inch. Hope that helps.

Posted on Nov 06, 2008

  • 1 Answer

SOURCE: 1998 FORD 4WD RANGER 128,000

Its not the oil relief valve,since it only works when pressure is to high,and even then you dont lose all pressure.. look into the camshaft synchronizer having a broken drive gear at the bottom.they tend to break..working on one now that has this problem,so I know. luck to ya!

Posted on Feb 08, 2009

Molson02536
  • 3854 Answers

SOURCE: oil pressure problem

You oil pressure sending unit has gone bad, it's common to go bad and some even leak oil. 
The oil pressure sensor is on the back of the block on the passenger side, you can get to it from the top and not from the bottom. There are (2) switches back there that screw in to the block and you can only see it from the top of the engine. The Oil Pressure Sending Unit is the one wire harness with a green and white strip on it. The other switch has more wires to it. 
When you pick up the new sensor, make sure you get the right one. make sure you get the Oil Pressure Sending Unit which sends variable oil pressure and has only one quick connect for the wire connector. The oil pressure switch is the one that only activates the oil light on older engine
Once you get the right part at Auto Zone for around $9.00, disconnect the wire clip with the green with white strip on it. and use a deep spark plug socket with a extension and u joint to get the sensor out. The sensor comes with teflon tape already and no oil should leak out from the block. It as simple as replacing a bolt and reconnecting the wire connector. 
Good luck and hope this helps, take no more then 10 min to do but about 5 hours for the engine to cool off LOL

Posted on May 29, 2009

  • 1 Answer

SOURCE: 88 ford ranger 2.9 low oil pressure

i just bought a BII with famous tick..........oil pressure light came on (no gauge). I installed mechanic gauge and showed 5 psi so I decided to replace oil pump. Pulled pan off (not fun!) the pickup tube was clogged and the was part of the timing chain tensioner in pan. I then pulled timing cover off only to find chain streched and the chain guide and tensioner pretty much gone. I think tick was chain slap..........will know for sure in a couple days.

Posted on Dec 24, 2009

drsinister69
  • 2317 Answers

SOURCE: low oil pressure on guage of my 89 ford ranger 6

Could be low oil level, a bad sending unit, or actually low oil pressure due to a worn oil pump or worn bearings.

Posted on Mar 09, 2010

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2 Answers

Why does my oil gauge vibrate when at a stop after driving freeway speeds, 2002 ford Ranger?


Factory gauges (especially Fords) are not known for being terribly accurate or reliable. As long as the gauge is pointed in the "normal" range, I wouldn't be too concerned.
If you want to pursue it, remove the oil pressure sending unit and perform an oil pressure test with a mechanical gauge. If the mechanical gauge fluctuates the same way, suspect a worn or failing oil pump. If the gauge is stable, I would suspect a faulty oil pressure sending unit.
If the truck has high miles, consider moving up to higher viscosity oil or adding an oil stabilizer. If could just be that the oil is breaking down when it's hot and the engine can hold consistent pressure with the thinning oil.

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The most common cause is too much pressure in the crankcase. It could be bad piston rings, or a problem with the PCV system. The engine is supposed to draw fumes from the crankcase into the intake and burn them, but the intake may be getting real oil instead of just fumes.

Jul 14, 2013 | 1996 Ford Ranger SuperCab

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Where is the oil pressure switch located on a 1987 ford ranger with a 2.9 L engine


2.9L and 4.0L engines-Left side front of the engine, below the cylinder head in the engine block.

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3 Answers

I have a 97 Ford Ranger with a 4.0 with 122,00


Check your oil pressure gauge sender first. It might be the pump but often they wear down gradually. It might also be the pressure relief valve spring. Most likely it is the oil pick-up pipe in the sump. Take the pan off and inspect for crud blocking it. If clear it will be very easy to check the pump. The pump vanes are driven directly so any free rotation would indicate a (rare) pump failure.

May 12, 2010 | 1997 Ford Ranger SuperCab

1 Answer

Low oil pressure on guage of my 89 ford ranger 6 cylinder


Could be low oil level, a bad sending unit, or actually low oil pressure due to a worn oil pump or worn bearings.

Mar 09, 2010 | 1989 Ford Ranger

1 Answer

My 1996 ford ranger oil meter was low and a ticking noise in engine for a week. today the ticking went crazy and the truck shut down. how much to fix oil pump


This is not what you wanted to hear. I had a Ranger (Emerald Green) The low oil pressure was caused most likely by a rod end bearing that was for some reason worn therefore leaving a gap in the bearing mating survaces so oil was running out the sides of the rod end bearing causing the low oil presure. The ticking that went crazy was the rod end bearing that destroyed itself and fell into the oil pan.

Quite possibly you now have a broken connecting rod as for the reason it shut down unless the engine computer sensed ZERO oil pressure and shut off the ignition.

I can tell you your problem is probably not the oil pump.

I see the following instore for you
1. head removal / valve resurfacing
2. crankshaft polishing
3. rod end bearing replacement and possibly resizing

The oil pump is the least of your problems.

Just being honest so you can understand what could be instore for you. Sadly it is not cheap.

Jan 30, 2010 | 1996 Ford Ranger SuperCab

1 Answer

Oil pressure problem


Replace your oil pressure sending unit. Usually costs about $10.

May 25, 2009 | 2000 Ford Ranger SuperCab

3 Answers

Over filled with oil. lifters knocking


You will get low compression and oil will blow-by and cause a smoke storm cloud behind your truck.
You can get a fluid pump to pull out excess oil through the dipstick.
same happened to me, truck is tough and fine...no bailout needed :)

Apr 28, 2009 | 1994 Ford Ranger Supercab

1 Answer

Oil perssure not steady on 02 ford ranger


Did you check oil pressure with a oil pressure gauge from the oil gallerys in the block. Determine if the oil pressure is adequate. Most likely its probably a bad gauge but if you used a oil pressure gauge and there readings inidictive of low source oil pressure then most likely you have a pump failure, or there is inadequate oil volume in your engine.

Mar 26, 2009 | 2006 Ford Ranger

1 Answer

Oil pressure slow to rise


you need to try a external gauge to check the pressure to see if your dash gauge is right

if the engine took 10 minutes to get oil pressure it would be dead by now i would replace the oil pressure sender unit first

Dec 30, 2008 | 2001 Ford Ranger Regular Cab

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