08 mack mp8 low oil pressure shut off at highway speed

[Zackmcc]

Truck keep shutting down low oil pressure stop engine at highway speed. replaced oil pressure sensor. Went buy a mack dealer to just ask some questions guy came out with labtop checked truck said everything seems fine if there where no oil pressure u would no it told me check wiring harness looked fine but I'm no wire expert or mechanic I just change parts. When I crank truck up no more problems oil pressure is right again engine sound fine normally runs 50 to 55 at 1500 rpms 29 at idle.  but before it come on it sticks at 35 even if I down shit to 9th and gas it.

[Challenger]

Are you 100% sure you replaced the oil pressure sensor not the crankcase pressure sensor.  

I’ve seen people replace the crankcase pressure sensor  instead of oil pressure.  Sensors are stacked, can’t remember if the top or bottom sensor is oil pressure.

[Mackpro]

Mack went through 3 or 4 part numbers/ suppliers of the oil pressure sensors. Mack sent out a bulletin warning that some counterfeit sensors even made it into the parts system. It’s possible you got a bad one

[Zackmcc]

It just says pressure sensor and from the diagram I got I replaced top might have to take out and replace again just to make sure when I get home runs 2 / 3 hours then hit shoulder crank it back up and repeat 

[liolis]

Hi did you find what's a problem.? I have same problem gas pedal when off hike driving. def done. som on can help where to look for problem? speed sensor ? oil presure sensor? have on dash bolt light on ?  thanks for any information 

[liolis]

On 4/9/2019 at 8:13 PM, Zackmcc said:

Truck keep shutting down low oil pressure stop engine at highway speed. replaced oil pressure sensor. Went buy a mack dealer to just ask some questions guy came out with labtop checked truck said everything seems fine if there where no oil pressure u would no it told me check wiring harness looked fine but I'm no wire expert or mechanic I just change parts. When I crank truck up no more problems oil pressure is right again engine sound fine normally runs 50 to 55 at 1500 rpms 29 at idle.  but before it come on it sticks at 35 even if I down shit to 9th and gas it.

I'm have ame problem. 1400rpm oil presure 40÷44max .it kicks out gas pedal.have to pull lower and start motor again and run.wich sensor do you change ? the one on filter  top driver side?  thanks