Originally Posted By: 4WD
It’s a digital gauge transformed into analog “graphics” … oil pressure, fuel, temperature, charging
The tach and speedo have real needles …
5.3& 6.0 GM trucks losing oil pressure PF48E
- Thread starter roygage
- Start date
At least we're getting something out of the new displays!
Patman: Yes, back in the day, they definitely had real gauges, in real time.
Originally Posted By: 4WD
Nice … your project?
4WD
$50 site donor 2023
Good grief … he must be from Austin 
Originally Posted By: Garak
Incidentally, is GM still using real oil pressure gauges, or have they switched to dummies? It's been a lot of years for me with a new GM....
Originally Posted By: clinebarger
Originally Posted By: 4WD
Nice … your project?
Originally Posted By: 4WD
Good grief … he must be from Austin
It's a crazy world we live in!
BlueOvalFitter
Site Donor 2023
Is that a '64 Impala next to the engine?
Originally Posted By: BlueOvalFitter
Is that a '64 Impala next to the engine?
OK. Still no firm resolution on just what is going on here. I am going to quote from GMs SI #PIP5276D. For your information an S.I. is not a service bulletin but rather an internal document to dealers from GMs engineering. I am always surprised by how little of a problem Gm will delve into with their techs. More like the problem is on a need to know basis and you do not need to know.
Condition, "A concern of a P0521 setting after an oil change and or low oil pressure indicated on the instrument panel."
Recommendations, instructions. "If you are working on a Gen4 V8 that is setting a P0521 or and low oil pressure indicated on the instrument panel in cold or hot weather and the engine is currently equipped with a PF48E oil filter, replace with a UPF48R if one is available."
"Note: Only use the UPF48R if if the Gen.4 V8 is setting a DTCP0521." And I will note this line is in red on the S.I.
Will someone please tell me, why would you only go with the improved filter if you had a problem? If the filter is the problem why no just supersede it to a improved version? Just seems nonsensical. And just what is the core problem here? Is the problem with the filters inability to flow oil or the filters bypass valve? Or, is the problem with the engines oiling system?
One more log on the fire. I was reading in another forum that once the P0 521 for low oil pressure sets the gauge defaults to 0. If this is the case it would be a game changer. Would explain for why these trucks do not suffer any damage while running with 0 oil pressure, why the lifters do not rattle. Guess you are not going to know until you do some actual pressure testing on the vehicle.
The oil port on the back of the motor is difficult to get at, there is a adapter available to test the pressure by installing said adapter in place of the oil filter. Do not have one but will be getting one.
Originally Posted By: roygage
Recommendations, instructions. "If you are working on a Gen4 V8 that is setting a P0521 or and low oil pressure indicated on the instrument panel in cold or hot weather and the engine is currently equipped with a PF48E oil filter, replace with a UPF48R if one is available."
"Note: Only use the UPF48R if if the Gen.4 V8 is setting a DTCP0521." And I will note this line is in red on the S.I.
Will someone please tell me, why would you only go with the improved filter if you had a problem? If the filter is the problem why no just supersede it to a improved version? Just seems nonsensical. And just what is the core problem here? Is the problem with the filters inability to flow oil or the filters bypass valve? Or, is the problem with the engines oiling system?
An interesting link with some good information.
http://sandyblogs.com/techlink/?p=5000
Well some more real world info on this problem. I was driving out of town this morning and noticed the oil pressure was dipping below 10 psi. I put it in neutral and gave it some revs and it popped up to around 30 for a second so the gauge seemed to be doing something. Then it started dipping lower until the warning came on. I pulled over and left it running and the engine sounded fine even with the gauge at 0. I turned it on and off a few times and it came back up to around 35. I decided to continue to my destination since I was halfway there. The gauge settled on about 10 psi for the rest of the trip(about 40 more miles).
After my meeting pressure came up to 40 idle cold and stayed at its normal 38 psi at 1750 rpm on the highway for the way home. I am not thinking it is the filter anymore and likely some gunk plugging the screen at the sensor or at least I hope. Our shop mechanic things that is the case - he said if it were the o-ring and it was pumping air at 0 psi the lifters would have been clattering something terrible.
This is with a Wix 57060 and 5w30 dexos with about 4000 miles on it.
2010 5.3 chevy
Originally Posted By: cmlind
Well some more real world info on this problem. I was driving out of town this morning and noticed the oil pressure was dipping below 10 psi. I put it in neutral and gave it some revs and it popped up to around 30 for a second so the gauge seemed to be doing something. Then it started dipping lower until the warning came on. I pulled over and left it running and the engine sounded fine even with the gauge at 0. I turned it on and off a few times and it came back up to around 35. I decided to continue to my destination since I was halfway there. The gauge settled on about 10 psi for the rest of the trip(about 40 more miles).
After my meeting pressure came up to 40 idle cold and stayed at its normal 38 psi at 1750 rpm on the highway for the way home. I am not thinking it is the filter anymore and likely some gunk plugging the screen at the sensor or at least I hope. Our shop mechanic things that is the case - he said if it were the o-ring and it was pumping air at 0 psi the lifters would have been clattering something terrible.
This is with a Wix 57060 and 5w30 dexos with about 4000 miles on it.
2010 5.3 chevy
I have changed the oil with around 30% left most times (5-7k) but switched from semisyn to Dexos 2 years and 30k ago and did go to 0% a couple times - 10k miles.
Most of my driving is at least 10 mile trips with a fair amount of highway miles. I do have some idling and 4000 lb trailer hauling. It is a work truck but mostly just moving me to jobs sites with the occasional hauling.
Originally Posted By: WellOiled
Originally Posted By: cmlind
Well some more real world info on this problem. I was driving out of town this morning and noticed the oil pressure was dipping below 10 psi. I put it in neutral and gave it some revs and it popped up to around 30 for a second so the gauge seemed to be doing something. Then it started dipping lower until the warning came on. I pulled over and left it running and the engine sounded fine even with the gauge at 0. I turned it on and off a few times and it came back up to around 35. I decided to continue to my destination since I was halfway there. The gauge settled on about 10 psi for the rest of the trip(about 40 more miles).
After my meeting pressure came up to 40 idle cold and stayed at its normal 38 psi at 1750 rpm on the highway for the way home. I am not thinking it is the filter anymore and likely some gunk plugging the screen at the sensor or at least I hope. Our shop mechanic things that is the case - he said if it were the o-ring and it was pumping air at 0 psi the lifters would have been clattering something terrible.
This is with a Wix 57060 and 5w30 dexos with about 4000 miles on it.
2010 5.3 chevy
Originally Posted By: roygage
One more log on the fire. I was reading in another forum that once the P0 521 for low oil pressure sets the gauge defaults to 0. If this is the case it would be a game changer. Would explain for why these trucks do not suffer any damage while running with 0 oil pressure, why the lifters do not rattle. Guess you are not going to know until you do some actual pressure testing on the vehicle.
The oil port on the back of the motor is difficult to get at, there is a adapter available to test the pressure by installing said adapter in place of the oil filter. Do not have one but will be getting one.
Originally Posted By: WellOiled
Originally Posted By: cmlind
But I had the same thing happen on my work truck. I changed the PF48E to a Wix 57060 and fresh oil and all has been well for around 4000 miles. '10 5.3 with 127k. Still watching it to see if it is the o-ring. Not sure how a filter can do that, but in my case it does appear to be the filter also. I have changed the oil with around 30% left most times (5-7k) but switched from semisyn to Dexos 2 years and 30k ago and did go to 0% a couple times - 10k miles.
Originally Posted By: cmlind
Well some more real world info on this problem. I was driving out of town this morning and noticed the oil pressure was dipping below 10 psi. I put it in neutral and gave it some revs and it popped up to around 30 for a second so the gauge seemed to be doing something. Then it started dipping lower until the warning came on. I pulled over and left it running and the engine sounded fine even with the gauge at 0. I turned it on and off a few times and it came back up to around 35. I decided to continue to my destination since I was halfway there. The gauge settled on about 10 psi for the rest of the trip(about 40 more miles).
After my meeting pressure came up to 40 idle cold and stayed at its normal 38 psi at 1750 rpm on the highway for the way home. I am not thinking it is the filter anymore and likely some gunk plugging the screen at the sensor or at least I hope. Our shop mechanic things that is the case - he said if it were the o-ring and it was pumping air at 0 psi the lifters would have been clattering something terrible.
This is with a Wix 57060 and 5w30 dexos with about 4000 miles on it.
2010 5.3 chevy
Problem #1. Somehow the passage leading to the oil pressure sensor is not a stay clean design. It needs help through mechanical cleaning. Changing the oil and filter may not clean this area sufficiently by itself.
Problem #2. The oil pressure sensor may be intermittent. Moisture can enter the gauge from the electrical connections. This moisture can degrade the bridge in the sensor. The sensor can be irratic depending on the amount of moisture.
