Raiderjesse

What’s up guys. Good really use your helpful knowledge on where to start figure out this issue.
Well go do my weekly gas fill up on my Silverado SS so check all my fluids as always and everything good. Oil change was due for next weekend. So I was on my way to work cruising a steady 70 mph, I did accelerate to pass up a slower car but nothing aggressive. Right after that my warning alarm goes off indicating low oil pressure and it’s pumping at 10. Pull over immediately. Turn engine of and on and stays at 10 on idle and when I rev it up I get to about 35 max. Could probably do more but didn’t want to over rev it. Truck has stock lq9 with 180k miles. Never had oil pressure issues always idled at 40 and 50 under throttle.

What could be the sudden cause of this. Bad oil pump? Appreciate any help. Thanks

FFDP

iTrader: (2)

Verify pressure with a manual gauge first.

At this point you don't know if it's a real issue or if there is an issue with the sensor itself. If the gauge matches the sensor/cluster then you are digging into it deeper.

Could be a failed oil pump o-ring, oil pump itself or possible issue with a cam bearing or worse.

swathdiver

Add two quarts of oil and start her back up, if the pressure is good, it's the o-ring.

RB04Av

First verify that you actually have an oil pressure problem, not a gauge problem.

Is the engine in typical low OP distress? you know, ticking lifters, lots of scraping and straining mechanical noise, bad smell coming out of the crankcase, oil is burnt, metal chips or glitter or fine powder in the oil? If not, you probably have a gauge malfunction, not a pressure one.

arthursc2

iTrader: (5)

Checking/changing this pretty much requires pump removal so may as well replace the pump: but the bypass may have stuck it's happy *** open

MikeGyver

iTrader: (5)

That is a great idea if it actually works. I mean really, only two more quarts will submerge the o-ring? It seems like it would need at least a gallon.

arthursc2

iTrader: (5)

I have a raw truck pan here. I can measure the water it takes to fill the pan. Prob need 1.5-2" more fluid on top of that to get to the o-ring

but, 2 more quarts is also more volume pushing into the pickup as well as being sucked in

could overfill and park on an incline, might help reduce the amount of oil you need to use to test this

swathdiver

It works and some fellas short of cash drove their trucks this way for a few years until they could afford to replace it. Pointing the nose down an incline also works.

RB04Av

Doesn't really have to "submerge" it. Just seeing if reducing the lift between the sump and the pump can improve the amount of oil that its "suction" will draw to itself. (we all know there's no such thing as "suction", it's just a handy mental image)

Not a "repair"; just a troubleshooting technique. IMO anyway. If I did it and found that it made a difference, I wouldn't drive the truck until I'd fixed it. But that's just me.

Note also that if the pickup has failed THAT BAD, the oil will be foamy or bubbly on the dipstick when running, due to all the air getting mixed into it. If it's not, chances are it's not a pickup problem.

someotherguy

Just replaced sensor on one of our SS's.. it was a little intermittent for a while but then went stone dead and was dinging its *** and telling tales of woe on the cluster. Not a fun job but not stupid difficult, sure chewed up my hand and wrist digging in there to replace it though.

Richard