That's a sign the oil pressure is dropping to below 7 psi at idle, allowing the
OP switch to close, turning on the light. It could be main bearings going out,
plugged oil pickup screen, failing oil pump or possibly coolant in the oil. I've
never trusted idiot lights for oil pressure and have installed a real oil
pressure gauge on every car I've ever owned that that didn't already have a
More often it's a bad oil pressure indicator sensor. I've had this
happen on old Chrysler products and every time it was cured by replacing
the sensor. It's cheap and easy to do. But do get the correct special
socket; if you try using a conventional deep socket, you will probably
damage the sensor's shell and cause an oil leak.
Oh, by the way, what kind of car, Randy? You never did tell us. The
cars I had it happen on were 1970s vintage, with a Slant Six, a 318, and
a 400. As I said: none of them had a real oil pressure problem, as
confirmed by a check with a mechanical oil pressure gauge; they were all
bad sensors, three of them.
Double post (with no year make and model?)
If the sending unit is leaking oil it will short out the wire and cause the
lite to turn on, assuming that the oil level is ok and clean, replace the
switch, clean out the connector really good and that means to disassembled
it when doing it.
Also the next time you post something, give the year make and model
Wowwwwwwww, this is the most responses i have ever gotten to a ? thank you
all very much. i'm sorry for not posting more info the first time. my car is
a 1998 dodge stratus es with v6 and 120,000 miles. i have changed this oil
every 3000 miles since new. and have run synthetic oil and some prolong and
slick 50 occasionally. i will read all of the posts and see what my next
atep is. thanks again Randy
It is also very often a sign of a bad "oil pisser switch" - so
nicknamed because of their propensity to leak oil. If some oil gets
from the "pressure" side to the "non-pressure" side it raises the
amount of actual pressure required to turn off the light. As it oozes
out the pressure required drops again, making the light come on and
off at different pressures depending on temperature etc.
Check pressure with a mechanical guage - and most likely replace the
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