Engine Goofy Oil Pressure

Chad91gt · Mar 9, 2017

So my question is this . I have a1991 5.0. Has 106,000 no. Completely stock. My oil when cold and just started car is about middle of guage . Then as it warms up it goes down. Street driving is still pretty low. Around 1 to 2 notches above red. Then on freeway coasting is a lol highest and giving a little gas goes down a bit. Then when fully warm my needle sits on bottom on red or just above or below it on idle. Then bounces up a little bit then down . Was wondering if it is something internal. But thinking that the miles are low so maybe not. Or maybe it's a lol pressure sending unit. Any ideas?

Dan02gt · Mar 9, 2017

I would try the sender first. Mine was doing the same thing and that's what fixed it.

Elswick8400 · Mar 9, 2017

Ive been here best bet i went to a store around here and bought a oil pressure test kit. Harbour freight dont know if u have one around u for ab $20. You need to hook up a mechanical gauge and check it. Its easy and best way to find out for sure. Stock gauges suck.

Chad91gt · Mar 9, 2017

So it seems pretty easy to replace the sender unit.. remove and replace? And does the oil pressure test kit simply hook up to the sender?

jrichker · Mar 10, 2017

Another vote for replacing the the sender - less than $15 at any of the major auto parts stores.

Check to see it the sender is the problem - turn the ignition switch to Run, remove the wire from the sender and ground it to the engine block or battery ground. It should go to about 75% of full scale.
If it does not, then the problem is not likely to be the sender

If that does

Chad91gt · Mar 10, 2017

jrichker said:
Another vote for replacing the the sender - less than $15 at any of the major auto parts stores.

Check to see it the sender is the problem - turn the ignition switch to Run, remove the wire from the sender and ground it to the engine block or battery ground. It should go to about 75% of full scale.
If it does not, then the problem is not likely to be the sender

If that does

Is the sender unit and sensor the same thing? Where is it located

jrichker · Mar 10, 2017

Chad91gt said:
Is the sender unit and sensor the same thing? Where is it located

Yes.
It is down by the oil filter

Advance Auto Parts
BWD Oil Pressure Gauge Switch
Product Application(s):
1989 Ford Mustang LX •With Gauge BWD Oil Pressure Gauge Switch
Part No. S334 1989 Ford Mustang LX •With Gauge $12.99

Chad91gt · Mar 10, 2017

Awesome. Thanks for the help. I can just remove and replace right? Don't have to worry about draining the oil?

jrichker · Mar 10, 2017

Just twist it out and shout; nothing else to do ...

Unless you are foolish enough to try and do it with the engine running

Chad91gt · Mar 10, 2017

jrichker said:
Just twist it out and shout; nothing else to do ...

Unless you are foolish enough to try and do it with the engine running

Lol what size wrench or socket? I appreciate the help

jrichker · Mar 10, 2017

9/16" open end. There may be some limits on how far you can turn the wrench in single pass, but just keep at it.

Chad91gt · Mar 11, 2017

jrichker said:
9/16" open end. There may be some limits on how far you can turn the wrench in single pass, but just keep at it.

Hey man. Thanks for the help. I installed the pressure gauge switch and that did the trick. Never went below second white line on gauge when fully warm.

Engine Goofy Oil Pressure

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