How to Get an Oil Pressure Reading on an Lb7 Duramax
- #1
Hey guys I need some info on my lly that all the sudden has this oil pressure low and dinging on my dic. I ran information technology sat afternoon andruns fine, shut it downwardly and a few hours later I pulled out of driveway and this came on, I backed dorsum in and checked oil, full, I don't drive it but had a friend hook a tech 2 upwardly and information technology was reading two.3-3.1psi for oil force per unit area. we used the tech 2 and moved all the guages so thinking the guage will move. How many volts does the oil pressure switch demand? Today I changed the oil filter thinking something in filter was messed upwards but still the same affair. I read to remove filter and plough information technology over to see if oil goes eveywhere and nope information technology doesn't. The affair is that the engine has no DTC and is total of oil and sounds perfect idling and ramped upward to 1200rpm for a few seconds and back to idle then off. Does anyone out there have any insight on this consequence and what to do at present? I accept a new switch on order god foreclose a dealer conduct one lol. I'm looking for annihilation here like where would ane bank check for oil force per unit area with a transmission guage, how many ports to check it in too?
WarWagon
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- #2
GM's starting time step for depression oil pressure is to change the oil!
Cut open the quondam filter and meet if it is full of stuff. The DIC comes on at 9 PSI. Y'all only need 13 PSI at idle as I recall. Shifting into gear or reverse to bulldoze volition crusade a sudden oil pressure drib of ~3 PSI.
Terminal time I had this issue my oil was 2 quarts high from biodiesel contamination and it was thinning out the oil on the 2008. Thus a large reason GM says to modify the oil first. An oil sample tin likewise tell y'all if coolant is wiping a bearing etc.
Oil pressure switches/sensors are famous for failing. You lot merely need to test there for pressure with a mech approximate.
- #3
and then yous are proverb that my oil might be too high? information technology shows full or just higher up full now since i added a little when this all started happening(im only talking a quart or less). And then take out the sensor and check for pressure there or at the filter housing? I need to wait until i have trhe new switch considering my luck the old i will break since the nether of that truck is rusted, thanks to New York DOT lol
- #four
I checked the oil pressure with a guage at the filter housing and little oil came out when i pulled the temp probe for my recon guage and the oil pressure guage didn't even move, I am then non getting this? what else to check now guys? I know you're out at that place guys please something?
WarWagon
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- #five
Change the oil. Oil can have diesel fuel in it and that volition thin the oil out to where you loose oil pressure. This is why my high reading of +two quarts was from biodiesel in the oil and that thinned information technology out. Engines use oil esp. when thinned out so you can dump 2 quarts of fuel in and still be downward 1/2 quart...
After the oil change verify oil force per unit area.
Take a sample of the oil as you will need to get it to a lab and run across what is in it. bad begetting, coolant, diesel...
- #half-dozen
ok I changed the oil and still no pressure on either guage. I am waiting for the new pressure sensor/switch to go far but I dubiety that the trouble right? Any ideas now guys? Annihilation?
btfarm
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- #7
I've never heard if a DMax oil pump failure just I suppose information technology's possible. I've seen it happen on gasser motors before.
Sure hope that isn't information technology though...
- #eight
I want it to be my last resort to exist honest. Would the motor knock and audio similar its coming apart at idle fifty-fifty if no oil pumping thru it, I even ramped it up to 1500rpm and the turbo whistles when i let off and everything. It purrs like a kitten just as it always does, nothing a different
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- #9
What oil did you utilize? 5W40, or 15W40? I believe the Duramax's use a low force per unit area, high volume oil pump. I am not sure if that alter was made in 2006, or earlier. How many miles exercise you have on the odometer? It probably is just an oil pressure sending unit gone bad.
- #10
well i thought that then i ordered a sensor, just why nothing on a oil transmission oil pressure guage tapped into the port on filter housing? I always winter/summer use 15W/xl for diesel engines
CtChevy427
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- #11
The gear has been know to spin on the shaft. I would attempt to hook your estimate up to the same port as the sensor is in and get from there.
- #12
how do y'all go to that gear, pull the motor? if that spun on the shaft does it mean new pump? boy this sucks being desperate lol
- #13
Put your mechanical gauge on the oil gallery port on the block. That is your best bet. And if that truck has not rattled itself to bits with the approximate displaying zero and then odds are you have oil force per unit area. The sending units are known to get out on these trucks besides as the stepper motors in the cluster.
M.I.S.South.
Oil pump gears Unremarkably spin after prolonged exposure to high rpm. Thinned oil will still show pressure, (insert some expressionless scientists law here)
supervene upon sending unit and while waiting put your mechanical guess on an oil galley port on the passenger side of the block.
HaulinGas
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- #14
Ok, I have an 05 LLY with almost 200K on the clock, This truck had a rough life previous to my ownership. I have always maintained this truck to a "T" and it has treated me very expert. Last October a friend took it to Mich to pick up a 36' Baja and bring back to NY. On the way out later stopping for fuel and food he started the truck and nuance showed no oil PSI and DIC said "Low Oil Presure". On the style back the guage would read fine then read 0psi and never missed a beat. Ordered a new sending unit (withal yet to install and a year afterward) and fro a few months showed normal PSI and at present agin shows cipher for PSI at this current time. I'grand sure in my case its just the sending unit of measurement every bit for I have put 30K on it like this. The merely mechanical outcome I've had has the fuel cooler nether the drivers bedside rotted out and was leaking and then I bypassed it. Other and so that this truck is Peachy and I honey it, fifty-fifty though information technology is the undesireable x cab long box, and get 20mpg with the Hypertech Programer. I did purchase a new updated nuance from United Radio in Syracuse just to brand sure the guage wasn't bad, we did install and unistall the hypertech a few times and that would somtimes trigger the guage to work/stop working. Good luck and I say drive it for at present, you would know if you didn't have PSI for sure.
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- #15
Hullo and welcome to our forum! :cheers2:
We are truly a diesel fuel forum that is run by diesel fuel enthusiasts, for diesel fuel enthusiasts! :thumbsup:
Take a little fourth dimension and make full out your signature, past filling in all the info for your truck. We have many helpful and knowledgeable members here that tin help you with any issues that may arise.
:welcome2:
- #16
Like Chevy Silverado Man said Welcome to the Truck Stop Haulin Gas!
Information technology may not exist a bad thought to beginning your own thread if your having troubles. Or feel gratuitous to get-go a thread in the introductions department to better introduce yourself. Nothing sucks more than trying to fix two private bug in 1 thread that aren't on the aforementioned vehicle, because lets face it, non everybody is going to take the same trouble.
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- #17
Yup. What Big Blue Chevy said. 
One thread per issue is much easier to track.
Source: https://www.thetruckstop.us/forum/threads/oil-pressure-low-on-the-dic.31614/
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