MAP sensor
Posting Guru
Joined: Dec 2005
Posts: 1,528
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From: Peterborough, Ontario
The top one is the vacuum sensor that Dave S refers to in his earlier post. The bottom one is the tach sensor, if your tach isn't working right, it can be that sensor. It can also cause the tranny to act up, as it also relays info to the tranny control. (On E40D's.) If it's pooched, it's a dealer only item though.
Lead Driver
Joined: Mar 2006
Posts: 5,096
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From: western SD
The sensor in the last pic, by the oil fill, is the tach sensor. The one in the first pic is the baro sensor that Ford Trans Tech was talking about I think. Does you new truck have an autto tranny?
Cargo Master
Joined: Mar 2006
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From: Sand GAp, KY
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Postmaster
Joined: Apr 2008
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This is your engine speed sender, it drives the tachometer on the dash and also feeds into the PCM that controls the transmission, again for shift schedule purposes.
Postmaster
Joined: Apr 2008
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Smartass - my map is on my windshield, it adjusts to my location automatically too 
But really the sensor in question is not a MAP (manifold absolute pressure) sensor, as it's not reading vacuum off the intake manifold like it does on a gasser truck - instead it reads the ambient pressure, hence why it's a barometric sensor.
But really the sensor in question is not a MAP (manifold absolute pressure) sensor, as it's not reading vacuum off the intake manifold like it does on a gasser truck - instead it reads the ambient pressure, hence why it's a barometric sensor.
Postmaster
Joined: Apr 2008
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Actually mine has a white plastic funnel-looking thing at the end of that port, and the hole in it is clean of dirt and grime. How you'd clean yours I dunno tho, you can't just poke through the nastiness cause it will then end up inside the sensor... if it were my truck and the trans shifted fine I'd probably be tempted to just let it be as is for the time being, then replace it with a clean junkyard unit whenever I found one.
Logistics Pro
Joined: Jun 2009
Posts: 4,116
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From: metairie, LA
it dont shift that great to begin with. i bought this as a future powerstroke build, but i might leave it like it is depending on if i get everything else straightened out. take a look here... https://www.ford-trucks.com/forums/9...out-there.html
New User
Joined: Dec 2007
Posts: 14
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From: Oregon Coast-- North Bend
Tac Sensor
Think the sensor your pic shows is on the housing just in front of the injector pump and is the sender for the tac in the diesel.
OOPS, realized that this was already answered on next page of post
OOPS, realized that this was already answered on next page of post
Last edited by gfemling; Aug 3, 2010 at 02:49 PM. Reason: mistake