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1996
Hmmmm
20 years old.
Could be it's just getting tired, as in worn components.
As long as you're getting adequate pressure at operating RPM it should not be a major concern.
If you're not using 15W 40 I would suggest doing so.
Cheers.
You need to find out why you have low oil pressure. It is normal that as engine rpm's increase, the oil pressure will rise- the oil pump is moving oil faster. Even though your light goes out, you could still have critically low oil pressure. There should be sufficient pressure at idle to keep the light off. The light will come on when your oil pressure is almost nil- I believe for some it's as low as 8 psi. Normally, oil pressure at idle is specified anywhere from 15 to 40 psi. You would have to check specifications for your Expedition. To verify oil pressure, hook up a mechanical gauge at the oil pressure sending unit on the engine block. Check with a local shop.
The causes run from easy, simple to budget busting ruin. Low oil level, wrong grade oil, real old oil, oil leaks, internal oil leaks, worn oil pump, worn crankshaft bearings. It was pretty common on older very high mileage cars to have a fluttering oil light at stops and idle. It was time for a rebuild, or time to look for another car.
It may be the oil pump. If the gauge is going up when the rpms increase it's probably not the gauge or pressure switch. If the computer senses the oil pressure is low it will shut the vehicle off to try to save it's self from catastrophic failure. Also it may start cranking longer before starting. Thats it building oil pressure before the computer will let it start. Make sure oil is full, clean & thick.
Your problem is not the oil pressure sensor, it's because your idling is going too low. If you raise the RPM slightly the light goes out. 650rpm is a little low. I think your car has an Idle control valve ... or look if it has an Idle position sensor. I suspect you have an issue with that.
Hope this helps.
You oil light does not only show when your oil is low, it also indicates when your oil pressure is low. If the light is staying on all the time, even when at a level, higher rpm, then you most likely have a problem with your pressure and the issue needs to be checked pretty soon. If it is only doing it when your car is idling low, then you just need to take care of your electrical/gas or air intake problem first. The oil light will come on if your car is idling low, but it should go off when you get to speed. Does it go off?
Oil pressure always changes with rpm. At idle you should have around 10 psi, and it should max out at high rpm around 50 psi or so. You not only can't have as much pressure at idle, but you don't need it either.
why do you want your rpms higher while idling? you don't want them high because your gas bill will reflect that. slow shouldn't matter but if it's dying while on idle it could either be your mass air flow sensor or your fuel filter being clogged
It IS NOT Advisable to Drive this Vehicle Untill This Problem is AT LEIST DIAGNOSED, You Need A MANUAL OIL Pressure TEST, to Determine If OIL PRUSSURE is SAFE @ >>Oil Pressure at idle speed with engine at operating temp.min. bar 0.5 Regulated Pressure bar 4.3
If it Is ok First On List Is Oil Pressure Sensor But if it's Low> Replace
Oil PUMP
Obviously Inspect Wires To Sensor / Sensors Before High Dollar Parts Are Resorted to.
650 to 700 rpm is ideal for the 300zx. the 300 was meant to be a performance car used at the rpms of 3000 and 6000. i have a 91 300zxtt that i use as a race car and a low idle is never really a bad thing as long as it isnt searching or loping
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