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97 PSD map sensor

Discussion in '7.3L Powerstroke Diesels' started by greenskeeper, Jun 28, 2020.

  1. greenskeeper

    greenskeeper Full Access Member

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    Truck seems to lack power. "slow" to build boost in my opinion to what I am used to.

    Checked all of the usual things (ICP, fuel pressure, up pipes, charge hoses, TPS, etc) and I've come across odd map readings.

    I have a boost gauge tee'd into the MAP line going from the intake runner.

    With the line disconnected I get 0psi on the gauge and 0psi on the map sensor.

    Pressurizing the line with shop air to 20psi I sometimes get close to 20psi on the map sensor according to autoenginuity, other times I get 0psi or somewhere in between.

    I don't get a CEL at all, zero codes when scanned with autoenginuity.

    Took it for a drive, large hill on a 2 lane 55mph highway.

    With or without the map connected I got about 14psi max (which is ok for stock) except it took a LONG time to get there with the pedal floored and o/d turned off going 70mph @ 3000rpm.

    Floored the HPO is 2500psi and 36% duty cycle.

    I tempted to order a map, except the motorcraft OEM is about $100, and I'm never a fan of throwing parts at things.
     
  2. 79jasper

    79jasper Chickenhawk

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    With it giving incorrect readings, I would say it is bad.

    Sent from my SM-N960U using Tapatalk
     
  3. bbjordan

    bbjordan Snow Monkey

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    You could swap the MAP sensor from a known good working truck, or get one from the auto wreckers.
     
  4. greenskeeper

    greenskeeper Full Access Member

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    Yup just wanted to confirm before replacing a $100 part
     
  5. greenskeeper

    greenskeeper Full Access Member

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    OBS 7.3 trucks are rare around here
     

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