So my car is going through what seems to be a pattern. It starts having huge pressure drops into the red for the oil pressure gage. Last time I believe they replaced the oil regulator and then a few months later the mass air flow sensor went (Delphi). I just had the pressure drops start happening again (1 year later) and didn't do anything about it yet (time for an oil change though and it's about a quart and a half low when I checked) but now the mass air flow sensor just kicked the bucket again. What is the root cause of the problem?
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if lucky, and for sure can be.
the PCV is bad, (or clogged,) replace it is wise.
for sure 14 years old. it is all gunked up
and causes huge crankcase pressure bad, and huge oil consumption or worse oil leaks to ground or even blown seals $$$$$$$$$$$$$
no miles told
time is not useful for oil , miles is
and if driving 85mph, it will use more oil
all engines made burn some oil
the piston oil control rings do not ever seal 100% if it dead the top rings , seizes and engine is now a wreck.
that is the why
best is check the levels ever fuel fill up then if ok, skip 1 check
or more based on when it drops 1/4 LT. never let it go lower
keep it on full, all the time , so oil runs cooler. and longer
With an oil pressure gauge:
Remove the oil sender unit and install an oil pressure gauge at the cold engine and let the engine warming up. And record oil pressure data.
You will see if the oil pressure match your problems if so then there is an internal leak or bad oil pump or old engine oil.
When you had the pump replaced did anyone look at the rod and main bearings? 99% of all low oil pressure problems I've seen has been directly related to bearing wear, not a bad oil pump. Replacing the pump will give you slightly better pressure temporarily but that won't last very long. Verify the actual oil pressure using an external mechanical gauge. If it's low (likely it is) go back into the oil pan and use plasti-gage on the bearings to measure clearances. In reality though, in an engine with that many miles, it's best to either completely rebuild or replace it though.
The "check gages" light comes on in response to the oil pressure (not oil level) gage dropping too low. Step one is to check to make sure the engine has oil pressure. Use a mechanical gage inserted directly into the engine when the oil pressure sensor screws in. If the pressure is good, you need to check the gage. Your dealer has a tool that attaches to the connector from the pressure switch that gose to the gage. He can then test the gage, cluster and circuit wiring. If that is ok the culprit is the oil pressure sensor itself. I normally don't recommend replacing parts without a proper diagnosis but an oil pressure switch is relatively inexpensive. You might want to try that first. It's relatively common anf if that's the culprit, you will save a bunch of $$$ no having to go to your dealer. If you still have a problem, you have at least eliminated one item and are only out a couple of bucks.
Do you believe oil gage? Oil psi sensor can go bad. If PSI correct then is PCV valve clear? I'm more inclined to think you have some kind of electrical problem, false gauge, ignition quits or fuel delivery problem. Extreme high oil PSI would blow out your engine seals, leaking oil everywhere. When you get high oil psi, does removing oil cap make it drop? Do you have good clean oil and filter?
When it quits do you have spark, fuel to delivery system? (throttle body or fuel inj) High oil psi shouldn't make truck hard to start. Baffling.
At this point I would strongly suggest that you have your mechanic hook a mechanical oil pressure guage to the engine and make absolutlely sure that the pressure is up to manufacturers standards. It may simply be a failing oil pressure sending unit, but, until you know, it could turn out a lot more expensive! Thank you, Dana
first thing, have you check the oil level, maybe its low? if the oil level is ok, when was the last time the oil was changed. could be the oil is too old. last thing, possible low oil pressure due to an internal engine problem. (bearing wear)
You need to replace the oil pressure sending unit, this is what tells your gauge what the pressure is. For future information if your oil pressure drops again and its a real failed oil pump within a few minutes you will internally damage the engine. I would get a new Oil Pressure Sending Unit. Let me know if you have any questions.... Thanks!
I hate be the bearer of bad news but it sounds like you bottom end bearings are getting worn out. You have excessive bearing clearances causing your drop in oil pressure.
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