What did you do to your NNBS GMT900 Tahoe/Yukon Today?

[wsteele]

Mine is below that 20 line and I need to be WOT to hit 40+. Cruising is in the 30 range.

I think the dealer would say your pressures are well within spec. Mine is a 2007 LMG and hover around 30 psi at idle, original pump.

 

[08z71bgm]

Oil pressure at idle with torque pro.

 

[avalonandl]

Mine is below that 20 line and I need to be WOT to hit 40+. Cruising is in the 30 range.

I have 160 k and my hot idle is just over 20. Crusing is high 30's to 40 psi.

When cold my oil gets over 40 when accelerating.

 

[gooffeyguy]

Oil pressure at idle with torque pro.

View attachment 280913

That seems low. My hot idle pressure is mid 20s, usually 25 or 26

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[08z71bgm]

That seems low. My hot idle pressure is mid 20s, usually 25 or 26

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That’s what I was thinking. I’m due for an oil change soon and I disabled AFM with hptuners.


Googled some things and found that the screen and sensor could be clogged or malfunctioning. Which I don’t think the sensor is bad as it matches what’s on the dash. The other thing was the VLOM needs to be replaced but that was hit or miss sometimes it would fix someone’s problem other times it wouldn’t.


Open to ideas....

 

[08z71bgm]

I have 160 k and my hot idle is just over 20. Crusing is high 30's to 40 psi.

When cold my oil gets over 40 when accelerating.

I have about 140k or so but engine hours is way up there. 67xx.

 

[Just Fishing]

So curious question...

Whats idle and cruising oil pressure gauge look like?

Mine seems a bit low and if it’s going I would like to be ahead of it and find a replacement and pull this one.

I wish i knew the history of my old 5.3, but 40psi hot idle seems to be normal.
my engine @28psi hot idle was eating cam bearings.

now it's possible there was some botched work done on my engine in the past, like the original lifters were in fantastic condition, and the cam looked pretty fresh.
So someone might have nicked a cam bearing resulting in the sparkles....


that said, nip it in the bud early is my thought.


Oh and on mine, i found my oil pressure regulator in the pump was sticking.
I did loosen a bunch of sludge before everything went south...

My oil pressure had a very slow rise, changing the sensor did nothing.
The screen was clean but i changed it anyways.

Mine also failed to get the 10psi per 1k mark.
so at 5krpm +, it would sit under 50psi.

 

[Greg Kulbick]

Wife says the 07 spewed gas and isn't taking any in. Ordered the canister vent solenoid and updated harness. Going to take it up to the gas station tomorrow to see if I can coax some gas in there so she can drive it until the parts show up.

Replaced solenoid and used updated harness, no change. What's next, canister?

 

[Fless]

Replaced solenoid and used updated harness, no change. What's next, canister?

Probably. Also the vent solenoid can stay closed if the truck is running while filling, so is a potential issue. Ignition off so the vent valve opens.

Try pushing (blowing) some air through the disconnected canister, it should be pretty easy. If the canister has gas in it or the pellets are escaping, new canister time.

I'm about to pull mine to test it for leaks, since mine has the opposite problem, evap leak.

 

[iamdub]

Yes I know the bracket looks janky but this ***** won’t move!! Used my prior garage door experience for using the punched angle.

Bruh... As soon as I saw the first pic and before I read your sentence at the end, the reply I heard forming in my head was "As a former overhead door tech, I approve of your shenanigans". Coincidentally, I had an emergency repair at my brother's house last night- thrown cable.

 

[Greg Kulbick]

Probably. Also the vent solenoid can stay closed if the truck is running while filling, so is a potential issue. Ignition off so the vent valve opens.

Try pushing (blowing) some air through the disconnected canister, it should be pretty easy. If the canister has gas in it or the pellets are escaping, new canister time.

I'm about to pull mine to test it for leaks, since mine has the opposite problem, evap leak.

Truck was off, tried going full blast at the pump and you could hear it gurgling then shut off, then some gas spilled out. Was able to get fuel in as long as I was deliberate with the handle. I'll get under there this weekend and pull the canister, give it a good shake.

 

[Fless]

Probably. Also the vent solenoid can stay closed if the truck is running while filling, so is a potential issue. Ignition off so the vent valve opens.

Try pushing (blowing) some air through the disconnected canister, it should be pretty easy. If the canister has gas in it or the pellets are escaping, new canister time.

I'm about to pull mine to test it for leaks, since mine has the opposite problem, evap leak.

@Greg Kulbick one other thing is to check for pinched evap lines around the canister and fuel tank.

 

[Greg Kulbick]

@Greg Kulbick one other thing is to check for pinched evap lines around the canister and fuel tank.

I checked everything while routing the replacement this evening and they all look good. One thing stood out to me, the shape of the new hard line to the canister from the solenoid was not able to follow the original routing over the top of the other lines. I had to go below them, but still well out of the way.

Edit:
I double checked the video I referenced to install and both the original and the replacement shown were routed low.

¯\_(ツ)_/¯

 

[RooTBeeRthe1st]

I have about 140k or so but engine hours is way up there. 67xx.

I'm just over 145k
But hours...can't remember if 8,000+ or 8,500+.

 

[Sparksalot]

I'm just over 145k
But hours...can't remember if 8,000+ or 8,500+.

 

[RooTBeeRthe1st]

View attachment 281012 View attachment 281013

Checked when I parked at work.

Which means my hoe has averaged ~18mph over it's lifespan so far.

 

[Doubeleive]

So curious question...

Whats idle and cruising oil pressure gauge look like?

Mine seems a bit low and if it’s going I would like to be ahead of it and find a replacement and pull this one.

@54k mine sits at 40 often but will go down to just above 20 hot idling sometimes

 

[gooffeyguy]

Or just a lot of idling, which is pretty norm for ex-cop PPV/SSV vehicles like Sparky's

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[avalonandl]

View attachment 281012 View attachment 281013

I have 5560 hours. At 160 k miles.

 

[03_GMC]

Bruh... As soon as I saw the first pic and before I read your sentence at the end, the reply I heard forming in my head was "As a former overhead door tech, I approve of your shenanigans". Coincidentally, I had an emergency repair at my brother's house last night- thrown cable.

Lol love it. Yeah I still do random repairs but don’t try to. Punched angle is a mans best friend.


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