map sensor
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map sensor
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ok heres the problem when I unplug my map sensor the truck runs good but not great when i put it to the floor and let off then go again i only have about half the power untill i shut the truck off and restart it. If i plug the map sensor in i have almost no power so i bought a new map sensor still runs the same. AE shows no problems. boost is usually 15-16psi its a 96 powerstroke canada truck that never made it there any one have any ideas??
ok heres the problem when I unplug my map sensor the truck runs good but not great when i put it to the floor and let off then go again i only have about half the power untill i shut the truck off and restart it. If i plug the map sensor in i have almost no power so i bought a new map sensor still runs the same. AE shows no problems. boost is usually 15-16psi its a 96 powerstroke canada truck that never made it there any one have any ideas??
Post Fiend
Joined: Oct 2003
Posts: 5,903
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From: MICHIGAN
You say AE shows no problems, does this mean no codes or....
Did you watch the MAP PID while all this was going on?
Have you checked the small rubber line going to the MAP for pin holes, cracking ect?
Boost seems OK, could be higher.
Check the Fuel Pressure:
If it's time for a fuel filter now's a good time.
FP @ idle
FP under a load
FP after you let out of it.
This will require some rigging so you can drive it with the FP gauge in place.
Did you watch the MAP PID while all this was going on?
Have you checked the small rubber line going to the MAP for pin holes, cracking ect?
Boost seems OK, could be higher.
Check the Fuel Pressure:
If it's time for a fuel filter now's a good time.
FP @ idle
FP under a load
FP after you let out of it.
This will require some rigging so you can drive it with the FP gauge in place.
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fuel pump is brand new as of last wensday map line was replaced when i did my boost gauge the truck has had the problem since i bought it the truck also had a bad fuel pump when i bought it so it masked this problem but i got the truck for $3500 about a year ago with 170000 4wd crewcab
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The preasure you see on your ae should be more than atmospheric preasure if you are getting boost. At idle you should see 14.8 or so then when the turbo kicks in should go up from there ie 15 pounds of boost would show 29 on your scanner
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Thanks for the info i do know the differance between psia and psig I am a service tec for a large mech contractor i am still baffeld by why the map being plugged in kills my hp and when i stomp the accelrator to the floor with the map unplugged it does the same thing . If i dont throw it to the floor with the map unplugged it runs fine but still lacking some ponys but it will still pull a 15k trailer
Postmaster
Joined: Sep 2007
Posts: 4,195
Likes: 6
From: Medford Oregon
Sounds like the classic bad MAP sensor. But you have good boost and did replace the sensor.
What does AE report for boost (running)?
What is the part number on the Ford MAP sensor?
Many look alike, plug in, don't CEL but just won't work properly.
What does AE report for boost (running)?
What is the part number on the Ford MAP sensor?
Many look alike, plug in, don't CEL but just won't work properly.
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could a bad exhaust back pressure sensor cause the computer to think it has an overboost situation?
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Postmaster
Joined: Sep 2007
Posts: 4,195
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From: Medford Oregon
But the EBPV by the turbo could be closing. That would cause about 1/2 power. Do you hear a hissing sound when the problem occurs? If so disconnect it by the two wire connector just below and in front of the turbo.
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