map sensor missing
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
He should have both. The MAP (Manifold Absolute Pressure) is used to figure the amount of boost from the turbocharger. The MAF (Mass Air Flow) determines the total amount of air moving into the engine.
Lead Driver
Joined: Sep 2007
Posts: 8,180
Likes: 669
From: Scio, OR
The MAP sensor is usually mounted somewhere in the area of the rear passenger side and is connected to the intake manifold with a tube. I'm not precisely sure on a '99 cause I've not seen one. It measures pressure.
The MAF sensor is usually in the air inlet pipe between the air filter and the turbo. It measures air flow.
The MAF sensor is usually in the air inlet pipe between the air filter and the turbo. It measures air flow.
Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Welcome to FTE.
Is the wiring to the MAP and the rubber hose still laying there? Was the hose plugged off, or left open? Kind of sounds like someone tried to fool the computer in regards to boost levels, but didn't know what they were doing. Any chips or tuners on the truck?
As long as the wiring is still there, installing a new MAP sensor will be easy enough.
Is the wiring to the MAP and the rubber hose still laying there? Was the hose plugged off, or left open? Kind of sounds like someone tried to fool the computer in regards to boost levels, but didn't know what they were doing. Any chips or tuners on the truck?
As long as the wiring is still there, installing a new MAP sensor will be easy enough.
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Elder User
Joined: May 2004
Posts: 812
Likes: 1
From: Northwest Florida
So what's the sensor in my intake pipe (7.3)?? Looks more like a temperature probe rather than airflow. Anybody?
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Post Fiend
Joined: Mar 2007
Posts: 26,966
Likes: 50
From: Texas
Where exactly are you talking about? There's the AIT (air intake temp) sensor on the filter box. There's nothing between the filter and turbo, but there is a AIH (air intake heater) mounted on the spyder or X shaped piece in front of the turbo that mounts to the intake plenums. It has a threaded rod sticking out the end and there are wires bolted on (ground and hot)
Elder User
Joined: May 2004
Posts: 812
Likes: 1
From: Northwest Florida
Thanks F350-6. It's gotta be the AIT. I failed to make it clear that I don't have the stock air filter box. It's a cone type filter (AEM Brand) attached by a stainless steel pipe to the turbo. There is a hole in the pipe for mounting the probe.
As for the air intake heater, I removed it and installed a plug. Here in FL I have no need for it, or the restriction it puts in the airflow.
As for the air intake heater, I removed it and installed a plug. Here in FL I have no need for it, or the restriction it puts in the airflow.
Posting Guru
Joined: Apr 2009
Posts: 2,447
Likes: 1
From: Northern Idaho
Maybe this will help...... It is the green plug without an arrow pointing to it just to the right of the AIH Delete w/Boost Fitting.....
If it's not mounted look around for a loose wire or look at the picture and following the wiring harness on your truck and see if you can track it down.
If it's not mounted look around for a loose wire or look at the picture and following the wiring harness on your truck and see if you can track it down.
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New User
Joined: Dec 2010
Posts: 2
Likes: 0
Thanks I got digging around once I determined what the spider was and found it tucked in the back near the firewall. I think some one had shortened the hose because it wouldn't reach where it was supposed to mount without me rerouting the hose.
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xc4jokestomper
1987 - 1996 F150 & Larger F-Series Trucks
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Jun 10, 2011 12:04 PM
