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Old 11-14-2017, 10:24 AM   #1
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Loss of oil pressure on TV

Hello all, need some advise...

Only been able to take out the TT a few times since purchased this past summer. On our first journey, the oil pressure gauge went to zero on grades when the RPM went up. Once I took my foot off the gas, the pressure was back to normal. It happened again when the RPM got up again.

Any idea what could be causing this? I had a lot of work done on the TV when we knew we were getting a TT.

Any advise would be greatly appreciated.

Safe and happy travels.
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Old 11-14-2017, 10:45 AM   #2
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If the TV is running fine otherwise, I'd first look at the oil pressure sending unit. Been a few years, but my 79 F150 had a similar issue and it came down to dirt in the sending unit and under a high load it would clog up and not register.
Got rid of that truck in 1998...it served me very well.
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Old 11-14-2017, 10:46 AM   #3
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Are you sure the oil level is at the full mark? If so it sounds like the oil return passages in the rear or the head are not letting the oil return to the pan quick enough. not sure if they could be clogged or a design issue. Back in the old sludgy oil days it was not uncommon for passages to get plugged, I have not heard of this in a long time.
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Old 11-14-2017, 11:09 AM   #4
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Quote:
Originally Posted by Chief T View Post
Hello all, need some advise...

Only been able to take out the TT a few times since purchased this past summer. On our first journey, the oil pressure gauge went to zero on grades when the RPM went up. Once I took my foot off the gas, the pressure was back to normal. It happened again when the RPM got up again.

Any idea what could be causing this? I had a lot of work done on the TV when we knew we were getting a TT.

Any advise would be greatly appreciated.

Safe and happy travels.


1- How many miles on the TV?
2- Oil level up to spec. on dipstick?
3- Engine temp. (water) also high when this happens?
4- Do you have an auxiliary oil cooler installed?
BTW - an auxiliary trans. cooler would also help save the transmission.


It could be a combination of all above. If you have high mileage on the TV the oil pump tolerances may have worn and therefore can not maintain pressure at high RPM. Oil that is also hotter than normal will thin out and cause low pressure also (sometimes just using a "high mileage" oil or next viscosity heavier will get you through but, not a cure). Low oil level can cause the oil pan to be "sucked dry" at high RPM and so could sludge in the pan and/or a partially blocked oil pump screen.
Engine temp. in general can contribute to high oil temp (which you probably don't have a guage for) as well as high trans. fluid temp. (also no guage) since trans. fluid is cooled through a separate side tank built into the radiator.

You don't mention what kind of work was done to the TV so, what I've discussed above is a general "guess" of what could be going on in a TV of this age without knowing any other details.

Let us know.....we'd all be happy to help you figure it out.
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Old 11-14-2017, 11:13 AM   #5
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Quote:
Originally Posted by TheWolfPaq82 View Post
If the TV is running fine otherwise, I'd first look at the oil pressure sending unit. Been a few years, but my 79 F150 had a similar issue and it came down to dirt in the sending unit and under a high load it would clog up and not register.
Got rid of that truck in 1998...it served me very well.
X2


Quote:
Originally Posted by llr View Post
Are you sure the oil level is at the full mark? If so it sounds like the oil return passages in the rear or the head are not letting the oil return to the pan quick enough. not sure if they could be clogged or a design issue. Back in the old sludgy oil days it was not uncommon for passages to get plugged, I have not heard of this in a long time.

X2 Not very common anymore with today's advanced technology engine oils as long as it was changed as recommended.
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Old 11-14-2017, 11:28 AM   #6
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Originally Posted by rracer5 View Post
1- How many miles on the TV?
2- Oil level up to spec. on dipstick?
3- Engine temp. (water) also high when this happens?
4- Do you have an auxiliary oil cooler installed?
BTW - an auxiliary trans. cooler would also help save the transmission.


It could be a combination of all above. If you have high mileage on the TV the oil pump tolerances may have worn and therefore can not maintain pressure at high RPM. Oil that is also hotter than normal will thin out and cause low pressure also (sometimes just using a "high mileage" oil or next viscosity heavier will get you through but, not a cure). Low oil level can cause the oil pan to be "sucked dry" at high RPM and so could sludge in the pan and/or a partially blocked oil pump screen.
Engine temp. in general can contribute to high oil temp (which you probably don't have a guage for) as well as high trans. fluid temp. (also no guage) since trans. fluid is cooled through a separate side tank built into the radiator.

You don't mention what kind of work was done to the TV so, what I've discussed above is a general "guess" of what could be going on in a TV of this age without knowing any other details.

Let us know.....we'd all be happy to help you figure it out.
Much appreciated. Here's some info you requested...

1- How many miles on the TV? 165,000, Use “high mileage oil”
2- Oil level up to spec. on dipstick? Yes
3- Engine temp. (water) also high when this happens? No
4- Do you have an auxiliary oil cooler installed? No
BTW - an auxiliary trans. cooler would also help save the transmission. Have one.

Work done June 2017: Transmission serviced, cooling system, new thermostat, rear diff. fluid, clean-out throttle body, new spark plugs & wires, and a couple minor leaks.

Truck runs like it’s brand new. This is my DW daily driver and we average around 3-5k a year since we got it a few years back.
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Old 11-14-2017, 11:37 AM   #7
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If oil pressure was truly zero at higher rpm's, you'd know it in a hurry by the awful sounds. Sending unit or gauge issue.
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Old 11-14-2017, 11:49 AM   #8
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You have been given some good advice.

Your TV is a 2003 GMC?

My advice....

I belong to this 'site' to talk about campers and camping.
I belong to a Ford 'site' to talk about my F-250 7.3 Ford.

Go to a good 'site' for your make and model GMC and ask them directly.
I have a 2001 Ford, so I will not give advice on your 2003 GMC.

Some members here will give you some suggestions on a good site and they on that site will walk you through what is going on, step by step.


Car/truck sites are just as friendly and mean as camping sites.....
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Old 11-14-2017, 11:52 AM   #9
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If you lost actual oil pressure like that you would know in a hurry. The sound would start in the hydraulic lifters devoid of oil. I would look into the oil pressure sending unit and/or the electronically controlled step motor that controls the gauge.
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Old 11-14-2017, 01:24 PM   #10
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Quote:
Go to a good 'site' for your make and model GMC and ask them directly.
I have a 2001 Ford, so I will not give advice on your 2003 GMC.
X2...

google "GMC forum" join and ask the question there
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