High oil pressure reading

[tincob]

87 Targa, 62K miles

Lately I've been noticing high readings on the oil pressure gauge.

At idle it will read between 2-3 bar then it will go right up to 4-5 bar when the RPM is only at 3000-4000.

I don't recall it being this high at the beginning of this year.

Oil is Shell Rotella T15W-40.

Any cause for concern? Possible causes? The gauge going bad?

[DRACO A5OG]

Prior to this event what has occurred? Just as usual driving or ???

I would check the ground/connections at the sensor and behind the gauge, clean and polish if needed and make sure there are fitted tightly. Then please report back.

[tincob]

Nothing unusual.

I'll have to find time some weekend. With the kids getting ready to go back to school, the weekends have been packed with last minute trips.

I haven't touched the wiring but I guess that's the first trouble shooting step.

[Targa Me]

same thing happened to my 3.2.
replace the oil pressure sender.

[DRACO A5OG]

Originally Posted by tincob

Nothing unusual.

I'll have to find time some weekend. With the kids getting ready to go back to school, the weekends have been packed with last minute trips.

I haven't touched the wiring but I guess that's the first trouble shooting step.

Mine pegged after an AX event, found signal wire had snapped off. Re-soldered and cleaned grounds then all good. I verified with a buddy's gauge and it read the same.

[KTL]

My gauge went belly up recently. It would only go up to 1 bar and wiggle a little bit. Grounding the sensor lead would peg the gauge, so I knew the gauge was OK.

I was concerned about not having reliable oil pressure & would be selling the car soon. So I plugged in a mechanical oil pressure gauge by installing a M12 x 1.5 male to 1/8 NPT female adapter fitting into the oil temperature sender location next to the engine cooling fan.

I was fortunate to have the metric adapter fitting already on hand from my perpetual racecar rebuild. So that fitting and a few others made it easy. I only had to cook up a piece of hose to connect the gauge to the engine. Some AN-4 braided hose with hose end fittings and an AN-4 male to 1/8 NPT male fitting did the trick.

Fired up the engine and the mech gauge read good oil pressure just like I had expected. Of course while running the engine to view the oil pressure on the temporary gauge, the dashboard gauge started working.......... go figure. But I figured an intermittant oil pressure sender is basically worthless. So I replaced the sender. Not cheap...........

[kodioneill]

The oil pressure on my carrera and sc is the same as yours 2-3 idle warm 4-5 at 4000 rpm I think your pressure is normal.

[DRACO A5OG]

Today, mine was reading 2.7 bars at idle. checked ground and signal wire, all was good, then I decided to tap on the sender. Bingo, working as it should.

Try tapping on the sender, it may clear it up.