FC13BINJECTION

I have a quick question. When I start up my car, the oil pressure rises with the revs when the car warms up but then it will slowly drop to 0. This happens when I am driving also, the oil pressure will rise to 60+ and then when I am at a steady speed it will slowly drop to 0. I searched this and all I could find were posts for broken gauges or ones that will rise past 110 on the gauge. If I missed a post for this, please include the link to it.
Thanks

RotaryEvolution

iTrader: (30)

get a mechanical gauge and verify if you have an oil pressure problem or not.

Street_Knight

dude, I asked the same thing and everyone said it was normal due to it being oil injected.

arghx

iTrader: (3)

Dude, the stock oil pressure gauge, while better than some cars from that era (think fox body mustang which doesn't even have numbers and never moves from the "normal" area), still pretty much sucks. I have both my stock and aftermarket oil pressure gauges in right in my 88 nonturbo. At idle when fully warmed up the stock gauge reads like 40ish and the autometer reads like 24. Aftermarket gauges are also a lot more responsive, while the stock gauge tends to lag behind changes in rpm, throttle, etc.

There's probably a resistance spec for the stock oil pressure sending unit. See if it's still good or not.

Street_Knight

yeah

My5ABaby

iTrader: (7)

It's normal for it to rise when the load on the engine is increased and fall when the load on the engine decreases. It's not normal for it to just drop to 0 while driving at a constant speed.

Good suggestion.

liv

do you have idle problems when it drops?

josecampos47

my 87 non turbo does the same thing but on start up goes to to 110 and stays doesnt move and i just replace the stock oem gauge cluster for a newer one and it does the same thing ... what eles could it be so i get a aftermarket oil pressure and how hard they to install

slpin

iTrader: (9)

your gauge is just being stupid dumb and hyphy
if you really have 0 psi... really, you will know - and you will know fast.
dont worry about it, or put a new gauge on, mechanical or electrical doesnt matter.
just one that works.

josecampos47

there is no way to fix it
or what could be wrong with the engine or is it always the gauge

slpin

iTrader: (9)

I ALREADY TOLD YOU
you gauge is being STUPID DUMB AND HYPHY!!!!

just ignore it like a check engine light!

josecampos47

ok no need to yell i can read good lol ight i just to make i wasnt goin to blow anything.

slpin

iTrader: (9)

like i said
if your engine really had 0 psi of oil pressure
it would of siezed up long ago

bradenscreed

if you replaced the stock gauge with another stock gauge and it reads the same it could be the sensor....i mean, yeah. change the oil press. sensor with one form the junk yrad or get a new one. if no change then get a new aftermarket gauge, which i find too cumbersom to hook up, but i trust aftermarket after the car is 20 years old. then if still are having issues take it to a shop, and get them to check it out, cause 0 psi means you aint moving buddy. check yours sensors, gauges go out, but so do sensors, remember that.

FC13BINJECTION

Thanks for the replys. Also, it was working last month but then I removed my a/c and the piping so and changed the oil so I figured I must of messed up the sensor near the oil filter. Ill play with it later and see if it changes. If not I will have to swap it out. Thanks again.

wardaj

I just bought a 3rd gen. It does the same thing. When the oil is hot it tends to show 0-10 psi at idle and low load. I hooked up an aftermarket guage to verify that i wasn't about burn the motor. The factory guage seems to read 20 psi low with warm oil.