Problem with the computer thing ,well i would imagine it is ,try changing the oil pressure switch if no go then agent to use their software to diagnose problem sorry here but some of these things drive me to desperation ,the old things with a inline injector pump and all manual over air safety devices but once the electronics come in ?? you need a geek with a laptop under their arm not a mechanic with a big hammer .
SOURCE: Oil pressure reading low
Many things can attribute to the oil pressure being reduced. The sending unit can not functioin properly due to build up of varnish & sludge on the inside of the switch. Worn bearings, allowing too much oil to pass without any restriction, or less restriction, can cause lower oil pressure.
Most vehicles will have a low pressure at or near idle when warm and 35 pounds shouldn't be a major concern.
35 pounds when accelerating & at higher RPM's, is too low and I would suggest that if you can, you go ahead yourself and just replace the Oil Pressure Sending Unit. I say this, as it's less expensive to replace it than to get a mechanic to test it & if you cure your problem, you're done. If not, you're out the expense of that switch and a few minutes of labor, you'll have to judge the value for yourself.
You didn't mention your mileage, or any history regarding oil changes, there is a valve that allows the oil to by-pass the filter, those can get stuck partially open & cause lower pressure (seldom happens thought), if the engine oil is old and hasn't been replaced on schedule, a few oil changes with just regular oil for about 2,000 miles instead of 3,000 will help to clean it up.
There is also an Oil Pressure Switch but that is for the trouble light, not the gauge. If you don't have an engine light flickering or coming on, evidently this switch is reading sufficient pressure not to alert you. Remember, many cars only use this switch & never see the pressure.
I'm also considering that it's winter & you have 5W-30W oil, it is extremely thin, you could move up to a 10W-30 as soon as it gets a little warmer out. If this is due to high mileage & just normal wear.
good luck
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.
SOURCE: 93 Mustang 5.0L, my oil
Hello
The thing that cause this most commonly in the 5.0 V8 are worn camshaft bearings, the oil leaks by the bearings and this causes a loss of pressure, you are still well within the safe oil pressure zone for this engine up to about 5,500 RPM. You can replace the bearings in the car with the right special tools but it takes a very high degree of skill to do it right, and special tools to install the bearings, it is best to replace the camshaft and lifters at the same time, if the bearings are new then they are not installed correctly or one is damaged or has a score allowing the oil pressure to bleed by..
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