Spiked Oil Pressure and Low Coolant Temp

Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by Bluebird075, Oct 14, 2021.

  1. Bluebird075

    Bluebird075 Bobtail Member

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    Oct 14, 2021
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    Ok Guys, Please put your thinking caps on !! We are at our wits end. Are you ready….Ok here we go…
    We have a 2013 Peterbilt…Paccar MX13. Truck runs great but have been having an issue when I turn the A/C on. The oil pressure spikes and coolant temp goes down. The Peterbilt engineers have been troubleshooting for days and days. They even changed the ECM, EGR valve, front wiring harness, oil pressure valve, oil cooler, thermostat, turbo speed sensor, heater blower motor, Heater Control Head and tested the ECU.
    The check engine light is an EGR control valve.
    Now they are thinking it’s a ground wire or common wire….
    Has anyone ever heard of this issue? Would appreciate any ideas or suggestions !!!
     
    jamespmack Thanks this.
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  3. jamespmack

    jamespmack Road Train Member

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    I hope the first thing they did was install a manual psi gauge to verify correct. Determine if its mechanical or electrical fault. Looks like they are chucking parts at it to fix. I then would start checking grounds.

    @Goodysnap

    This gentleman might have a better idea.
     
    Bluebird075 Thanks this.
  4. Goodysnap

    Goodysnap Road Train Member

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    Sounds like multiple issues?

    Truck model, last 8 of VIN?

    Please share engine fault printouts.

    Or is this a suspected gauge issue? Any other guages affected?
     
    jamespmack Thanks this.
  5. Bluebird075

    Bluebird075 Bobtail Member

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    Oct 14, 2021
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    Could you please email me (posy1275@gmail.com ) and I can send all the printouts to you ..
     
  6. Goodysnap

    Goodysnap Road Train Member

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    E mail sent.

    I will try to review this weekend.
     
    jamespmack Thanks this.
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