99 dodge Dakota 4 Cly. no oil pres. at idle. changed oil pump&sending unit. help?

Question

has oil presure while it is driven or when it is cold otherwise oil presure drops when i stop.

Answer 1

you may have a bad gage on it that will make it appear to not have oil pressure,hook a mechanical gage up to it then check it,if it lost all its oil at an idle it wouldn't come back up when driving,it sounds more like a bad gage then the actual oil pressure,a mechanical gage will tell you how much it has,good luck.

Answer 2

Had to replace the sending unit on my wife's '97 Dakota with 3.9 a couple of years ago, was reading about 15 psi at 2000 RPM. After replacing sending unit it read 20 psi at idle, about 750 RPM. Found out by using a mechanical Gage, so do that before buying a sending unit.

Answer 3

I have a friend who has a '91 dakota that did the same thing. He replace the both the switch and the pump several times. Also, he changed the wiring and some relay is the back of the meter set. Never fixed the problem for long. We tested the oil presure five times and it always had good pressure. The truck still runs today with 465k on it. Go figure?

Answer 4

Check the cam bearings in the head.
If there isn't a lot of leakage here then your main bearings are shot.
You need to spin in a set of main and rod bearings.
Not that hard of a job, but does need special skills and torque wrenches.

Answer 5

Have you had a mechanic put a manual gage in the block where the sensor goes to rule out a bad gage in your dash?

Answer 6

id check your gauge to factor that out first. we both know the oil pump is obviously turning, so there has to be pressure

Answer 7

BAD GAUGE OR WEAK SENDER.