no oil psi??????

Question

hi i have a 1986 nissan maxima and i JUST changed the oil...the gauge worked fine be4 the change but 2 minutes into my "first run" after the change...the psi gauge fell to 0 and stayes there....even when i have the key switched into "on" with the engine off, when i usually hear rrrrrrr and the gauges go to 90 psi normally...and now....nothing is it bad to drive the car?....i got new oil filter and am using valvoline maxlife synthetic blend

its not leaking oil and the filter is hand tight.....ah the gauge is a regular gauge...0-90....no lights

im not going to be sarcastic but i know what im doing...changing oil isnt rocket science.....I FILLED IT TO MAX WITH VALVOLINE MAXLIFE SYNTHETIC BLEND...hope that clears it up

Answer 1

Find the oil sending unit and make sure you didnt knock off the connector while changing the filter. I have no clue where the sending unit or the filter is on that model. If the wire did not fall off and it is a single wire setup, simply ground it with the key on, engine off and see if the gauge goes all the way up. Then you will know that the sending unit is bad, if it doesnt work your way back to the dash to see if it's electrical. Of course that is assuming it is pumping oil.

Answer 2

Check the oil filter mechanically and the oil level Don´t attempt to drive the car.See if there are any oil leaks. Does the car have an idiot light in addition to the oil gauge. If so, did that come on when you had the engine running?

Answer 3

You didn't forget to fill the oil back up did you?
How did the car sound when it was running?

It is very bad if you actually have no oil pressure.

I seriously doubt that car carries 90psi of oil pressure, so I am thinking the sending unit is bad.

Answer 4

You could have a bad oil filter that's blocking the flow.
You say you normally get 90psi when the engine isn't running? That's a new one.