Air temp sensors?????? High temp reading during diagnostics - Diesel Forum - TheDieselStop.com
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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 05-10-2012, 06:29 AM   #1 (permalink)
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Air temp sensors?????? High temp reading during diagnostics

02' ford F250 7.3L 4x4

while having my truck tested at a local Diesel shop for an intermittent issue, the mechanic showed me the display from the test set and said the only issue he could find was that the air temp sensor was reading way to high, it was reading between 165 & 168.....he pointed to a sensor that was located on the front pedestal of the Turbo assembly.....I know there are 2 different air temp sensors for my truck, one in the air box and the one he directed my attention to.

Question one : what are the 2 part #'s for the different sensors??? 235,000 miles, figured I would swap them both out anyway

Question 2 : what should the correct air temp readings be??? figured one should be close to ambient /outside temp, but the one that is after the turbo I have know idea on.....

Question 3 : what effect would the high temp reading have on the operation of the engine??? does it cause more of something or less??? does it open something or keep it closed??? what symptoms would the operator notice if any at all?????

any input would be appreciated.....
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Old 05-10-2012, 09:41 AM   #2 (permalink)
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The air intake heater that he pointed at has nothing to do with the way the truck runs. A lot of people remove that assembly and either plug it or use a drilled and tapped plug as a source for their boost gauge. I wouldn't replace it. The one in the air box is used so I would swap that if it was biased. I'm sure it has some affect on fueling, although the engine oil temp sensor is the main input for that.
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Old 05-10-2012, 11:20 AM   #3 (permalink)
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Quote:
Originally Posted by RT View Post
The air intake heater that he pointed at has nothing to do with the way the truck runs. A lot of people remove that assembly and either plug it or use a drilled and tapped plug as a source for their boost gauge. I wouldn't replace it. The one in the air box is used so I would swap that if it was biased. I'm sure it has some affect on fueling, although the engine oil temp sensor is the main input for that.
He said intake temp SENSOR...not heater. I have heard other people talk about another intake sensor (besides the one in the air box) but I have still do not know where it is. I just read on another forum (another issue...old posts) that were talking about it and said it does affect timing of the injector
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Old 05-10-2012, 12:23 PM   #4 (permalink)
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Quote:
Originally Posted by slayerf250 View Post
he pointed to a sensor that was located on the front pedestal of the Turbo assembly
The AIH is where I imagine the guy was pointing. That's the only other "temperature" related item in the intake system.
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Old 05-10-2012, 06:38 PM   #5 (permalink)
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Actually, there is a temperature sensor (MAT or Manifold Air Temperature sensor) mounted on the front of the turbo spider just above where it splits to feed the intake plenums. The IAH is above it and to the passenger side on the inlet from the intercooler. The MAT sensor has some affect on injection timing according to the service manual, but I don't know the exact relationship. I would guess it advances timing a bit with colder temperatures. It's screwed into the spider with pipe threads (tapered).

The IAT sensor mounted on the filter box is a bayonet mount made of plastic. If you can get your hands on a service manual, it has resistance to temperature tables for at least one of the sensors. They are pretty bullet-proof, so it would be unusual for either to be bad.

Tousley lists both, but not by part #

ELECTRICAL / POWERTRAIN CONTROL / POWERTRAIN CONTROL / AIR INTAKE TEMP SENSOR AIR INTAKE TEMP sensor F250 Pick-Up; 7.3L; On Charge Air Manifold 1999-07 SUPER DUTY

ELECTRICAL / POWERTRAIN CONTROL / POWERTRAIN CONTROL / AIR INTAKE TEMP SENSOR AIR INTAKE TEMP sensor F250 Pick-Up; 7.3L; On Air Cleaner 1999-07 SUPER DUTY
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Old 05-10-2012, 07:33 PM   #6 (permalink)
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is there anything wrong with leaving the 'filter box' temp sensor dangling or 'tucked' in umm for years.. interesting about the MAT sensor which kl posted.. gonna look for more info on that
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Old 05-10-2012, 08:43 PM   #7 (permalink)
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Thanks Klhansen....good to know. Wish my gauge (which I just got a replacement gauge in today) would pick it up.

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