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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 03-28-2009, 06:11 PM   #1 (permalink)
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barometric pressure sensor

I've looked all over for this, can anyone tell me where the barometric pressure sensor is located in my truck--01 F250 7.3L-- Part # F8UZ-12A644-AA

Thank you,
Steven
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Old 03-28-2009, 06:36 PM   #2 (permalink)
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It should be:

Passenger side of the engine, near the cowl (according to autozone)

It will have a three wire connector and a vacum line attached to it.
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Last edited by chuckster57; 03-28-2009 at 06:38 PM. Reason: clarification
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Old 03-29-2009, 03:49 AM   #3 (permalink)
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Quote:
Originally Posted by chuckster57 View Post
It should be:

Passenger side of the engine, near the cowl (according to autozone)

It will have a three wire connector and a vacum line attached to it.
Yep what he said.

A device that senses barometric pressure for the engine control system. May be combined with a Manifold Absolute Pressure (MAP) sensor.
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Old 03-29-2009, 08:38 AM   #4 (permalink)
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Thank you guys, I have been looking under the dash and apparently that's where the older ones were. I'll get out there today and swap it out. Hopefully it won't be a problem.
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Old 03-29-2009, 10:00 AM   #5 (permalink)
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I thought the Barometric Sensor was incorporated into the PCM in 99+ Powerstrokes.....

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Old 03-29-2009, 02:26 PM   #6 (permalink)
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Well, maybe Guzzle's right? I went looking for this and can't find it still. Anyone got a pic? Can you be a little more descript as to pass. side, near the cowl? I just can't find it.

Thanks.
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Old 03-29-2009, 02:29 PM   #7 (permalink)
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i dont know how you actually got a sensor but Guzzle02 is right for the 7.3L 99.5+ the baro is in the pcm.
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Old 03-29-2009, 02:31 PM   #8 (permalink)
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Uh oh, looks like Guzzle's got another point--http://www.thedieselstop.com/archives/ubbthreads/1999EandD/forums.thedieselstop.com/archives/showflat.php-Cat=&Number=401871&page=22&view=collapsed&sb=5&o=& fpart=1.htm

Another guy reported 2000+ models have it in PCM
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Old 03-29-2009, 04:44 PM   #9 (permalink)
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My bad - good catch. Autozone is talking MAP sensor (and like me) assuming/guessing the baro is in there. Not on your (OP) truck.
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Old 03-29-2009, 06:53 PM   #10 (permalink)
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Quote:
Originally Posted by guzzle02 View Post
I thought the Barometric Sensor was incorporated into the PCM in 99+ Powerstrokes.....
True. the Baro sensor was separate on the early 99's and migrated into the PCM for 99.5's
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Old 03-29-2009, 07:24 PM   #11 (permalink)
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Quote:
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True. the Baro sensor was separate on the early 99's and migrated into the PCM for 99.5's
I thought the baro and MAP sensor were the same thing.
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Old 03-29-2009, 07:30 PM   #12 (permalink)
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Quote:
Originally Posted by chuckster57 View Post
I thought the baro and MAP sensor were the same thing.
Nope, one measures Barometric Pressure, and the other Manifold Absolute Pressure. They might be identical sensors, but the MAP sensor is hooked to the manifold. If you disconnect the MAP sensor hose, it'll measure Barometric Pressure.
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Old 03-29-2009, 07:32 PM   #13 (permalink)
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Just to verify, the 7.3L DI BARO sensor was incorporated into the PCM on 1999.5 and newer engines. The stand alone sensor on pre-1995.5 engines is located under the driver's side dash near the steering column.
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Old 03-29-2009, 07:44 PM   #14 (permalink)
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Originally Posted by sparvin View Post
Well, maybe Guzzle's right? I went looking for this and can't find it still. Anyone got a pic? Can you be a little more descript as to pass. side, near the cowl? I just can't find it.

Thanks.

Boost Relief Valve +

its (MAP) in the second picture - on left side/edge.
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Two ideas when combined together will always make a third better idea!

I don't have to be wrong for you to be right.

Kent
@235K miles @ 071127
>202K miles @ 070828

2001 F350 7.3 PSD SD CC DRW Lariat, 4R100 (replaced at 41k w/rebuilt by dealer), 3.73, FX4 ESOF, Long Box - 3rd CPS. CPS in Glove Box MOD. K&N Filter. 6.0 OTA Cooler. Green to Red Coolant. Water filter. 203 T-stat. Fumoto Valve. Monroe Gasmatic Shocks.

Last edited by techkdb; 03-29-2009 at 07:57 PM.
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Old 03-29-2009, 07:50 PM   #15 (permalink)
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Quote:
Originally Posted by techkdb View Post
Boost Relief Valve +

its in the second picture - on left side/edge.
That's the MAP sensor.
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99.5 F250 PSD Supercab LB 4x4, ZF-6 w/SB Con OFE, 3.73LS, Boost & pyro gauges, Swamps S175/146 injectors, DP 80 HP Econo PCM (classic version), AIS, coolant filter w/"hokum" bracket, regulated return, heated mirror mod, lighted cupholder, Marinco heater plug-in.

Hard or no-start? Check Here
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