No oil pressure at start up, 2001 Tahoe

[OR VietVet]

There would be a quick and speedy exit back to KC, Mo. if I ever had to get any closer to Portland than I am now. That crappy city has been well documented in the news and videos. The city is ran by bratty children. Not any better at the capital either.

 

[Rocket Man]

Yes, please stay away from my city, we don’t need any more imports. Go back to Kansas, Missouri,California, Arizona, Texas and all the other places you’ve all come from in the last 10 years. The OG’s are cool, it’s all the assholes that moved here that are the problem. Funny too, you’d think from all the news that there’s theses big problems all through the city but it’s only in a few areas. Luckily far from me. But yes, please stay away. There for awhile we were the city with the most people moving to it in the West, now hopefully the news accounts will slow down the people moving here. It was ridiculous for awhile. BTW it’s still a beautiful place to live just don’t tell anybody. And if you’re an import from Missouri, you shouldn’t even be talking. What a ******** that entire state is.

 

[OR VietVet]

Off the meds again, I see.

 

[soulsea]

...

 

[clandr1]

Yes, please stay away from my city, we don’t need any more imports. Go back to Kansas, Missouri,California, Arizona, Texas and all the other places you’ve all come from in the last 10 years. The OG’s are cool, it’s all the assholes that moved here that are the problem. Funny too, you’d think from all the news that there’s theses big problems all through the city but it’s only in a few areas. Luckily far from me. But yes, please stay away. There for awhile we were the city with the most people moving to it in the West, now hopefully the news accounts will slow down the people moving here. It was ridiculous for awhile. BTW it’s still a beautiful place to live just don’t tell anybody. And if you’re an import from Missouri, you shouldn’t even be talking. What a ******** that entire state is.

Holy shit, shots fired.

 

[mattbta]

Yes, please stay away from my city, we don’t need any more imports. Go back to Kansas, Missouri,California, Arizona, Texas and all the other places you’ve all come from in the last 10 years. The OG’s are cool, it’s all the assholes that moved here that are the problem. Funny too, you’d think from all the news that there’s theses big problems all through the city but it’s only in a few areas. Luckily far from me. But yes, please stay away. There for awhile we were the city with the most people moving to it in the West, now hopefully the news accounts will slow down the people moving here. It was ridiculous for awhile. BTW it’s still a beautiful place to live just don’t tell anybody. And if you’re an import from Missouri, you shouldn’t even be talking. What a ******** that entire state is.

We aren't coming from Texas.

And PS folks, Texas is full. Don't come here.

 

[Fless]

We aren't coming from Texas.

And PS folks, Texas is full. Don't come here.

Ditto for Colorado. We're already overrun with insecure lefties that can't manage their own lives, but are compelled to try to manage ours.

 

[Rocket Man]

We aren't coming from Texas.

And PS folks, Texas is full. Don't come here.

Actually according to tax return data Texas was #4 in percentage of people moving to Oregon as of 2019, right behind Arizona at #3. Washington was #2, Cali #1. There’s 2 new houses up the street from me that sold to transplants, one from Arizona and one from Texas.

 

[mattbta]

Actually according to tax return data Texas was #4 in percentage of people moving to Oregon as of 2019, right behind Arizona at #3. Washington was #2, Cali #1. There’s 2 new houses up the street from me that sold to transplants, one from Arizona and one from Texas.

I'm wondering if these are actual Texans or are Californians arriving by proxy through Texas?

 

[Rocket Man]

I'm wondering if these are actual Texans or are Californians arriving by proxy through Texas?

Ummm...first they lived and payed taxes in Texas, then they moved to Oregon. I don’t understand why that’s so hard to accept. Anyway this thread has suffered the dreaded thread drift brought on by somebody that decided to bring my city into the discussion for some stupid reason and I can only guess why. Let’s get back on topic.

 

[OR VietVet]

The City of Roses.

It's a shame.

******* oil pressure and wipers.

 

[Tonyrodz]

212k, 05 LQ4, I have been reading that it's a fairly common on the LQ4. Low Oil pressure is the leading contributer. It causes the center cam bearings to get hot and spin making a mess of things. The good thing is it normally doesn't take out the block and there are bigger OD bearings available for it.

Same thing happened to my lq4. Mine was also an 05. Spun a cam bearing from low to 0 oil pressure.

 

[clandr1]

In the last month I've noticed my oil pressure at idle seems lower than desired (I'm used to seeing it around 40 PSI, but lately it's dropped down to 20 PSI after the motor is warm). At speed, it's still at or above 40 PSI, depending on throttle application.

I've owned this truck since it was new, and the only issue I've had with oil pressure is about 3 years ago I had a very sudden and steep drop with some valve clatter. I replaced the oil pickup tube o-ring and it was back to normal operation.

The oil has about 5k miles on it (I've used Mobil 1 High Mileage since 75k miles, and always wait until the oil change monitor hits 0% and tells me to change the oil), and the temperatures in Texas have been rising, but it still seems lower than it's ever been (even in the middle of the summer).

Any idea what the likely culprit is here? Or am I worrying about nothing?

 

[OR VietVet]

If oil is full and no clattering noises, then I would suspect the sender/sensor. I was gonna say the o-ring but you have addressed that unless it is acting up again for some reason. I believe the way they said here to test for the o-ring is to overfill by 2 quarts and point nose downhill and if pressure reads higher, then the o-ring is bad.

 

[Rocket Man]

In the last month I've noticed my oil pressure at idle seems lower than desired (I'm used to seeing it around 40 PSI, but lately it's dropped down to 20 PSI after the motor is warm). At speed, it's still at or above 40 PSI, depending on throttle application.

I've owned this truck since it was new, and the only issue I've had with oil pressure is about 3 years ago I had a very sudden and steep drop with some valve clatter. I replaced the oil pickup tube o-ring and it was back to normal operation.

The oil has about 5k miles on it (I've used Mobil 1 High Mileage since 75k miles, and always wait until the oil change monitor hits 0% and tells me to change the oil), and the temperatures in Texas have been rising, but it still seems lower than it's ever been (even in the middle of the summer).

Any idea what the likely culprit is here? Or am I worrying about nothing?


View attachment 277918

I would change the oil and make sure to use a good filter like Wix or ACDelco and then keep an eye on it. If it keeps getting lower then you can start worrying. Hopefully new oil and filter will bring it back up.

 

[clandr1]

I would change the oil and make sure to use a good filter like Wix or ACDelco and then keep an eye on it. If it keeps getting lower then you can start worrying. Hopefully new oil and filter will bring it back up.

Probably a good first step. I've been using AC Delco filters for the last 2-3 years, and before that it was a combination of Bosch, Wix, and Mobil 1 for as long as I can remember. I did take a really long trip to MO (7 hours one way) in the middle of March - perhaps that took more out of the oil than my usual around town trips and thinned it out ahead of schedule. If that doesn't fix it, I'll explore the sensor.

Thanks everyone, I'll update the thread when I have more.

 

[Jimmyy]

The City of Roses.

It's a shame.

******* oil pressure and wipers.

“*******”

 

[clandr1]

Probably a good first step. I've been using AC Delco filters for the last 2-3 years, and before that it was a combination of Bosch, Wix, and Mobil 1 for as long as I can remember. I did take a really long trip to MO (7 hours one way) in the middle of March - perhaps that took more out of the oil than my usual around town trips and thinned it out ahead of schedule. If that doesn't fix it, I'll explore the sensor.

Thanks everyone, I'll update the thread when I have more.

Just changed the oil with Mobil 1 5w-30 high mileage and an AC delco filter. No change. I grabbed a sample and will send it off to Blackstone Labs for analysis before I do anything else.

 

[livingez_123]

Just changed the oil with Mobil 1 5w-30 high mileage and an AC delco filter. No change. I grabbed a sample and will send it off to Blackstone Labs for analysis before I do anything else.

Why are you waiting for the the idiot reminder to change the oil? And also why are you using 5w30 in an engine that has over 200k on it?
Even after I refreshed my engine and checked all of the bearing clearances which were on the loose side between .0018-.0020 new they will be .0008-.0015 I run 15w40 and change it every 3-4k.
You need to check the pressure right off the pump using the front oil galley plug behind the power steering pump. I feel anything over 200k miles is a bonus, bearings do wear out and clearances get greater and oil pressure goes down. I'm glad I decided to go with a high volume oil pump, I would have been disappointed with a stock one.

 

[clandr1]

Why are you waiting for the the idiot reminder to change the oil? And also why are you using 5w30 in an engine that has over 200k on it?
Even after I refreshed my engine and checked all of the bearing clearances which were on the loose side between .0018-.0020 new they will be .0008-.0015 I run 15w40 and change it every 3-4k.
You need to check the pressure right off the pump using the front oil galley plug behind the power steering pump. I feel anything over 200k miles is a bonus, bearings do wear out and clearances get greater and oil pressure goes down. I'm glad I decided to go with a high volume oil pump, I would have been disappointed with a stock one.

Overlooking the condescending tone in your post, my general answer is "because that is how they designed it". Additionally, I've periodically had my oil analyzed by Blackstone and historically all wear indicators were in line and of no cause for concern. Bottom line is, everything has been working well so I've been doing what the owner's manual calls for. If this most recent sample shows an increase in bearing wear, I'll happily change to a different oil if it'll counter the degradation inside my motor.