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Discussion Starter #1
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.
 

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If it's an auto tranny, have you noticed any weird shifting issues?

MAP, BPS and EBP sensor should all read the same KOEO and be current atmosphere pressure. If one of those is off then you could experience funky issues like this.

My next suggestion would be to check the MAP line and the O-ring to the Y-manifold. I replaced the Y-manifold O-ring and it greatly smoothed my boost gauge readings. Didn't realized I pinched it until I got it off.
 

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Discussion Starter #3
If it's an auto tranny, have you noticed any weird shifting issues?

MAP, BPS and EBP sensor should all read the same KOEO and be current atmosphere pressure. If one of those is off then you could experience funky issues like this.

My next suggestion would be to check the MAP line and the O-ring to the Y-manifold. I replaced the Y-manifold O-ring and it greatly smoothed my boost gauge readings. Didn't realized I pinched it until I got it off.
shifts normal with the map plugged in or disconnected, really no change in the way the truck drives.

KOEO the MAP, EBPS, and BPS read the same (14.7 psi).

Map line holds pressure connected to my shop air.

Y-manifold o-ring and anything related to the turbo to heads has zero leaks.
 

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You might have the mysterious "random power" gremlin some of us are dealing with. Sometimes slow and sluggish and other times idles perfectly smooth and has no problem breaking the tires loose. Seems to best bet after a good rain.
 

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Discussion Starter #7
You might have the mysterious "random power" gremlin some of us are dealing with. Sometimes slow and sluggish and other times idles perfectly smooth and has no problem breaking the tires loose. Seems to best bet after a good rain.
power is consistently down from what I'm used to, weather has no effect whatsoever
 
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