“Low oil pressure” I’m stuck...

[CDLute138]

05 Tahoe.
210,000 on the odo.
New oil pump, pick up tube o-ring, OPS etc, etc.
Throws “low oil pressure” at idle and slowing, when I get on the gas (increase rpms) pressure builds as it should. I’ve been through the list and checked and rechecked to no avail...any ideas?? I’ve put a gauge on didn’t see it below 20 ever, (500-800rpms) which is low I know but from what I’ve read 6psi/1000rpm is in spec??


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[George B]

Did you replace the sensor?

 

[CDLute138]

Yes I did...been through the whole damn list lol


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[George B]

Yes I did...been through the whole damn list lol


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Ok, good. Didn’t see a list of what you did so I had to ask.

 

[afpj]

What brand sensor? These rigs don't like aftermarket for a lot of the sensors...knock sensors and oil pressure sender being on top of the list iirc. What oil filter are you using? I've read some people having lower oil pressure because of a crappy filter

 

[iamdub]

05 Tahoe.
210,000 on the odo.
New oil pump, pick up tube o-ring, OPS etc, etc.
Throws “low oil pressure” at idle and slowing, when I get on the gas (increase rpms) pressure builds as it should. I’ve been through the list and checked and rechecked to no avail...any ideas?? I’ve put a gauge on didn’t see it below 20 ever, (500-800rpms) which is low I know but from what I’ve read 6psi/1000rpm is in spec??


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20 psi at idle on a 200,000+ mile engine isn't so bad, if that is your actual pressure. The mechanical gauge you tested with could've been inaccurate. When you had the gauge on it and it showed 20 at minimum, did the "Low Oil Pressure" warning come on?

 

[YukonRog]

How did the inside look when you replaced the pump? Could it have a clogged "artery" somewhere? Maybe sump screen? I think it should be higher. My '05 Yukon has nearly 40 psi at idle. I also agree it may be a bad filter, seen that before. Did you change oil viscosity? Just throwin out ideas.

 

[CDLute138]

What brand sensor? These rigs don't like aftermarket for a lot of the sensors...knock sensors and oil pressure sender being on top of the list iirc. What oil filter are you using? I've read some people having lower oil pressure because of a crappy filter

Duralast for this go round of sensor replacement, this is the 3rd I’ve gone through, different parts places as well and at $60 a pop...ugh! Filter is K&N oil filter on the last 2 changes


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[CDLute138]

How did the inside look when you replaced the pump? Could it have a clogged "artery" somewhere? Maybe sump screen? I think it should be higher. My '05 Yukon has nearly 40 psi at idle. I also agree it may be a bad filter, seen that before. Did you change oil viscosity? Just throwin out ideas.

Inside looked good. When I replaced the pump I replaced the pick up tube o-ring and cleaned the screen, pan hell even the tube itself. I did not however change viscosity...


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[CDLute138]

20 psi at idle on a 200,000+ mile engine isn't so bad, if that is your actual pressure. The mechanical gauge you tested with could've been inaccurate. When you had the gauge on it and it showed 20 at minimum, did the "Low Oil Pressure" warning come on?

I was doubting my gauge as it felt like it didn’t seat right, I had the ops unhooked at the time as that’s where I was taking my reading from, I don’t have the right attachment yet to take it from the filter port, which I would’ve loved to do to see the difference from top and bottom ends


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