Red Oil Pressure Light comes on when idling (right after rod bearing replacement)

[George Hill]

I would suggest actually measuring oil pressure with a good old gauge before throwing any more money/parts at the car.

Honestly, this should have been done before the 2nd rod bearing job.

[MTiz]

Damn, sucks that you had to pay for this twice and the issue hasn't gone away (hey, at least you got welcomed to the spendy part of m ownership). You mentioned a thorough inspection of the oil pump, but did you have the pickup tube o-ring replaced?

If yes, then maybe this is a sensor issue? I would suggest actually measuring oil pressure with a good old gauge before throwing any more money/parts at the car.

Yes, we actually replaced the pickup tube o-ring. I wasn't going to as I didn't think it was very important, but my indy strongly recommended it.

Honestly, this should have been done before the 2nd-rod bearing job.

A new oil pressure sensor was put on after the first job as a diagnosis and the issue didn't go away. As far as a manual oil pressure test, I literally asked them to do this but they immediately began blaming the extra clearance bearings as the culprit. I am 110% getting that done next.

[George Hill]

As far as a manual oil pressure test, I literally asked them to do this but they immediately began blaming the extra clearance bearings as the culprit. I am 110% getting that done next.

If you are paying the bill....

[jbfrancis3]

What is Gennady's take on the issue?

[MTiz]

If you are paying the bill....

Just reached out to them and they said they ran a mechanical pressure gauge on the oil filter housing and everything was within spec before I took delivery a few days ago. I'm gonna do some more digging on the other forums as it doesn't look like anyone on here has had a similar issue.

[oceansize]

Just reached out to them and they said they ran a mechanical pressure gauge on the oil filter housing and everything was within spec before I took delivery a few days ago. I'm gonna do some more digging on the other forums as it doesn't look like anyone on here has had a similar issue.

https://forums.m3cutters.co.uk/threads/s54-oil-pressure-issue-no-end.232636/

Very similar to yours. See post 9 for what the issue ultimately was.

[sapote]

Just reached out to them and they said they ran a mechanical pressure gauge on the oil filter housing and everything was within spec before I took delivery a few days ago.

Ask them what was the measured pressure at operating temperature and idling. You should do it yourself.

[MTiz]

Ask them what was the measured pressure at operating temperature and idling. You should do it yourself.

I think I will. Any idea on a good tool kit for this?

[Arehman]

It’s your oil pump. Had the same problem recently and it was a faulty pump. We also ran the test on the oil filter housing to test oil pressure. And surely enough it was slightly low.

[sapote]

I think I will. Any idea on a good tool kit for this?

buy or rent a gauge with hose set from Auto Zone or O’Riley

[George Hill]

I think I will. Any idea on a good tool kit for this?

Since you had the shop replace the bearings a second time, I'm going to assume you think they are competent mechanics.

I would tell them the oil pressure light is still on. I would ask them to hook up the gauge with the car at operating temp and then you go an verify the readings. IF it's good you have a wiring issue. If it's not you should discuss options with them as they said they already checked it, this should be a mutual effort to resolve it now.

[MTiz]

How do I hookup the mechanical pressure gauge without moving the airbox? The oil cooler lines are mostly in the way and I can barely stick my fingers in there.

[eacmen]

How do I hookup the mechanical pressure gauge without moving the airbox? The oil cooler lines are mostly in the way and I can barely stick my fingers in there.

Can you take the factory oil pressure idiot switch out and hook the gauge up to that port? I believe its on the oil filter housing. Might need to take the airbox out to get to it easily.

Or, some have had oil filter caps tapped with 1/8 npt. Though some claim the readings are skewed based on if the oil thermostat is open or closed.

[MTiz]

Can you take the factory oil pressure idiot switch out and hook the gauge up to that port? I believe its on the oil filter housing. Might need to take the airbox out to get to it easily.

That's exactly what I'm trying to do, I just wanted to know if there was a trick to getting to it without removing the airbox and the headache that comes with that.

[eacmen]

That's exactly what I'm trying to do, I just wanted to know if there was a trick to getting to it without removing the airbox and the headache that comes with that.

Sorry mate, I think its a pita either way.


See page 10, there is a special tool for measuring at the oil filter cap:

http://www.billswebspace.com/MS54B32TrainingModule.pdf