: Where does your guys's oil pressure gauge average at?



YoshiMan
04-14-13, 09:52 PM
So i was driving my 03' ESV 6.0 on the freeway today at around 75 MPH, and the DIC displayed the "oil pressure low" message, along with the dinging sound for maybe about 4 seconds. It cleared and returned to normal almost as soon as it started and by the time i figured out what was going on and glanced at the pressure gauge, nothing appeared to be out of the ordinary. I stopped at the next exit and checked the oil level, and its right where it should be.

Now this has me a tad concerned even though i know the electronics in these sometimes can be finnicky... I have roughly about 135K on the clock now and in the little less than i year i've had the truck, the oil pressure gauge has always hovered slightly over the 1/4 mark, or what should roughly be 25ish PSI?

I've never had any engine issue with it, and it's never made any ticking sounds or any noise out of the ordinary.

I did a quick check using the specifications according to my factory service manual, and just running off the of the gauge alone it's appears to be above the minimum oil PSI specs, (1000 RPMs needs at least 6, the gauge showed the low teens, 2000 RPMs should be 18, it shows 20 ish, and at 4000 rpms it needs 24, mine showed about 30)

I guess my question is where your guy's oil pressure gauges average at? My understanding is that it should average around "40", but mine has never gone that high... Hmmm.. Just trying to gauge if there is some sort of electrical sensor problem or some internal mechanical issue that I need to address... thanks in advance!

bigirb2002
04-14-13, 10:10 PM
you within factory specs. sounds like your oil pressure sending unit is going out. easy fix. u cant go off everyones average because alot of things can make them differ. long as u are within factory spec you fine.

YoshiMan
04-14-13, 10:39 PM
That is true, of course! I'm wondering if the oil pump/o-ring is on it's way out, as i have seen others post about how that was the issue. Looks like it's time for more research!!

the cadillac man
04-15-13, 12:01 AM
That is true, of course! I'm wondering if the oil pump/o-ring is on it's way out, as i have seen others post about how that was the issue. Looks like it's time for more research!!

My truck normally is around the half way mark and is bone stock(I think it's the 40 mark)

bigirb2002
04-15-13, 08:42 AM
id change sending unit first being the cost effectiveness. then if she do it again you know to look further into the oil pump

jnrsesv
04-15-13, 09:08 AM
Before replacing the oil pump last month, our '05, with 162k, stock motor ran at 40 PSI religiously, whether hauling a trailer or not, or at whatever RPM. After the oil pump replacement its running about 50 PSI.

I would agree that yours sounds more like electrical rather than the pump or O-ring. Now if the motor was ticking then I would go after the O-ring and or oil pump.

appleroma
04-15-13, 09:18 AM
mine is around the middle 40 psi. Before changing oil pump, i suggest you to change oil and oil filter. sometimes the filter is clogged which causes low pressure.

bigirb2002
04-15-13, 09:46 AM
just to throw it out there synthetic oil will lower your pressure but offer better protection

YoshiMan
04-18-13, 04:16 AM
Well, now that i actually have been watching the gauge, i took it for another drive today, and its CERTAINLY lower than what you guys are saying as well as what a few friends at work with similar GM engines are showing.

In fact, here's a picture I took late last year shortly after I bought the truck to show people what such a gas-hog of a vehicle could get if you drove it right on the freeway. The pressure gauge usually hangs around 1/8-1/4, which i never really thought much of since it never alerted to it:

http://i208.photobucket.com/albums/bb220/YoshiMan38/Escalade/2012-12-31_21-18-03_507_zps6bf7ce47.jpg (http://s208.photobucket.com/user/YoshiMan38/media/Escalade/2012-12-31_21-18-03_507_zps6bf7ce47.jpg.html)

I've decided to down the truck for repairs until i can change the sensor and go from there. If i end up needing to drop the pan for the o-ring, then i am just going to go all out and replace the oil pump, waterpump, and timing chain while i'm at it as well.

I do have to say that by reading the FSM, it really doesn't doesnt look nearly as difficult as i thought it was going to be.. I love OHV engines just for this reason: no freaking timing belt to deal with during repairs!

bigirb2002
04-18-13, 09:38 AM
good lord def low pressure

wesyder
04-18-13, 10:17 AM
Well, now that i actually have been watching the gauge, i took it for another drive today, and its CERTAINLY lower than what you guys are saying as well as what a few friends at work with similar GM engines are showing.

In fact, here's a picture I took late last year shortly after I bought the truck to show people what such a gas-hog of a vehicle could get if you drove it right on the freeway. The pressure gauge usually hangs around 1/8-1/4, which i never really thought much of since it never alerted to it:



I've decided to down the truck for repairs until i can change the sensor and go from there. If i end up needing to drop the pan for the o-ring, then i am just going to go all out and replace the oil pump, waterpump, and timing chain while i'm at it as well.

I do have to say that by reading the FSM, it really doesn't doesnt look nearly as difficult as i thought it was going to be.. I love OHV engines just for this reason: no freaking timing belt to deal with during repairs!

Ive been thru both scenarios, when the oil pressure sensor went the engine sounded fine but when the o-ring went it sounded like a diesel

osure
04-18-13, 08:24 PM
Just did the oil pressure unit 3 days ago 27 mm or 1 1/16 deep socket back right side easy to do. 26 dollars at rock auto

YoshiMan
04-19-13, 10:43 PM
I got the sensor on the way, i'll start small and work my way up. I'm going to be taking it on a road trip in a few months and am in the process of changing ALL the fluids and such too, so i figured i won't go overboard and save some $$$ if i don't have to!

bigirb2002
04-23-13, 10:56 AM
any update?

YoshiMan
04-23-13, 03:06 PM
I just got the Sensor in the mail, but its blizzard conditions out, so it's gonna have to wait till next week! I did have to start the truck to move it, and when it was cold, the gauge was actually near the center of the gauge. But once it warmed up for a minute, it was back down to 1/8.

YoshiMan
04-24-13, 09:36 PM
Put the new ACDelco sensor in today. Kinda tricky, but a step ladder was helpful. However, the issue is not fixed... the gauge does however appear to be very precise now, as the needle moves quicker than it did before. Still averaging 1/8 on the gauge, so its o-ring time

wesyder
04-25-13, 12:16 AM
Put the new ACDelco sensor in today. Kinda tricky, but a step ladder was helpful! However, the issue is not fixed... the gauge does however appear to be very precise now, as the needle moves quicker than it did before. Still averaging 1/8 on the gauge, so its o-ring time!

Do you get any lifter noise at cold starts for a few seconds till it builds oil pressure ? Mine was doing that till i changed the o-ring

YoshiMan
04-25-13, 04:17 AM
I actually haven't had any funny lifter noise, or any noise at all for that matter. The engine sounds perfectly smooth. It could be that I am over-analyzing this whole thing, but I always have had OCD when it comes to the well being of my cars.

When you put your new sensor in, how did the install go? My old one took minimal effort to break loose, and then screwed out by hand. But the new one was kinda tricky because of the factory sealant that was on it. it took some effort to finish screwing it in, and never really felt as if it was snug. The FSM specified 13 foot pounds, but I was afraid i was going to strip something, so i just tightened it until it felt that it was level with the engine block. No leak at all though, so i assume it's in there okay... i almost want to pull it back out and reseal it just to make sure i didn't damage it. That new sensor was awefully light and flimsy feeling compared to the old one....

wesyder
04-25-13, 06:24 AM
I actually haven't had any funny lifter noise, or any noise at all for that matter. The engine sounds perfectly smooth. It could be that I am over-analyzing this whole thing, but I always have had OCD when it comes to the well being of my cars.

When you put your new sensor in, how did the install go? My old one took minimal effort to break loose, and then screwed out by hand. But the new one was kinda tricky because of the factory sealant that was on it. it took some effort to finish screwing it in, and never really felt as if it was snug. The FSM specified 13 foot pounds, but I was afraid i was going to strip something, so i just tightened it until it felt that it was level with the engine block. No leak at all though, so i assume it's in there okay... i almost want to pull it back out and reseal it just to make sure i didn't damage it. That new sensor was awefully light and flimsy feeling compared to the old one....

The install for me was straight forward I'm 6-05 so the reach was not an issue, i don't recall any resistance going in, my warning was going off at every stop and oil pressure gauge was falling to zero until i accelerated... But the o-ring issue included that noise at idle but never dropped to zero. Even before the noise and warnings the oil pressure never really went past the halfway point on the gauge including high speed freeway merging

YoshiMan
05-09-13, 02:44 AM
Well, decided to bite the bullet and drop the oil pan and such.... unfortunately the original O-ring appeared to be in pretty decent shape, (not torn, but it did get molded into kind of a square shape) So i guess i am going to replace it, throw it back together, and keep my fingers crossed. My 75' Coupe Deville is getting hammered by the weather not being in the garage, and since i am going out of town in a few weeks, the further diagnosis/repair will have to wait until sometime this summer if the issue is not corrected. We will see....

wesyder
05-09-13, 09:03 AM
Well, decided to bite the bullet and drop the oil pan and such.... unfortunately the original O-ring appeared to be in pretty decent shape, (not torn, but it did get molded into kind of a square shape) So i guess i am going to replace it, throw it back together, and keep my fingers crossed. My 75' Coupe Deville is getting hammered by the weather not being in the garage, and since i am going out of town in a few weeks, the further diagnosis/repair will have to wait until sometime this summer if the issue is not corrected. We will see....

Yeah mine wasn't torn either but also molded into a square shape, the way i knew was when i took the bolts out holding the oil pickup tube to the block there was some slack in the tube even before loosening the one bolt holding it to the oil pump, so i knew i was getting air from there

YoshiMan
05-09-13, 07:44 PM
Sweet! That is what mine did to! Yeah, once i took the bolt out it almost fell out on it's own, but with the new o-ring its felt solid before bolting her back up.

Well, that's nice to know, i was expecting to find the original o-ring ripped up and completely falling apart. I have work the next three days and then will probably get her running again this upcoming sunday. I'll post results.