Intake air temp sensor issues

[AH64ID]

Then that would be the ENGINE AAT Sensor between the Air Box and the Turbo, correct?

It’s not called that on this motor, can’t be certain of others.

On a 3rd gen 5.9 it’s called an IAT, inlet air temp sensor.

 

[BigPapa]

Gotcha. So, what’s the one in the intake cover called?

 

[AH64ID]

Gotcha. So, what’s the one in the intake cover called?

MAP, manifold air pressure sensor.

 

[BigPapa]

Cummins calls it a “Pressure Temperature Sensor, Intake Manifold”. Does it not register temperature?

Not trying to be argumentative, just trying to learn.

 

[AH64ID]

Cummins calls it a “Pressure Temperature Sensor, Intake Manifold”. Does it not register temperature?

Not trying to be argumentative, just trying to learn.

I’ve only seem it called a MAP sensor in the FSM. It does temp and pressure, but I also thought the one pre-turbo did too. Don’t feel like looking more on my phone so I’ll do it later.

 

[cerberusiam]

Both sensors do air pressure and temp. The one on the intake is manifold temp and pressure, the one on the TQ tube is inlet ambient pressure and temp. The difference between ambient and manifold pressure is calculated actual boost.

 

[Rodhuston]

So the intake manifold sensor could be going bad? That would make sense. Right at start up it’s accurate. Then gets Erratic. Then engine is warmed up get better

 

[cerberusiam]

Yes, the sensor can be bad as can the harness or coupler.

 

[Prairie Dog]

They get dirty from soot as well. Not a bad idea to occasionally blast it with sensor cleaner.

 

[AH64ID]

They get dirty from soot as well. Not a bad idea to occasionally blast it with sensor cleaner.

Shouldn’t be any soot in the intake.

Even when I ran an aftermarket cam with enough overlap to see an increase in intake manifold temp with the EB on I didn’t get any soot in the intake manifold.

 

[Prairie Dog]

Shouldn’t be any soot in the intake.

Even when I ran an aftermarket cam with enough overlap to see an increase in intake manifold temp with the EB on I didn’t get any soot in the intake manifold.

I dont know about "shouldn't" but there is. One place you can see it is on the turbines/fins. There's also soot drawn into the HVAC system - pull out the fan and take a look.
Some exhaust circulates around the entire vehicle at times and it gets sucked into the eng. It would defy all logic if it didn't.
Cleaning the sensor (if dirty) can reduce smoke slightly - I've witnessed it with an emmissions tester.

 

[AH64ID]

I dont know about "shouldn't" but there is. One place you can see it is on the turbo's vanes. There's also soot drawn into the HVAC system - pull out the fan and take a look.
Some exhaust circulates around the entire vehicle at times and it gets sucked into the eng. It would defy all logic if it didn't.
Cleaning the sensor (if dirty) can reduce smoke slightly - I've witnessed it with an emmissions tester.

That sounds more like a bad air filter and dust on the HVAC to me. I never saw anything on my turbos compressor blades, or in my intake.

I never did look at the HVAC fan in my 05, but other fans I’ve looked at have dust on them not soot.

I do agree that a dirty sensor can cause issues thou. If it’s dirty one needs to look at their air filter and intake setup.

 

[Prairie Dog]

That sounds more like a bad air filter and dust on the HVAC to me. I never saw anything on my turbos compressor blades, or in my intake.

I never did look at the HVAC fan in my 05, but other fans I’ve looked at have dust on them not soot.

I do agree that a dirty sensor can cause issues thou. If it’s dirty one needs to look at their air filter and intake setup.

Fleetguard AF's bad? Not a chance - you'll never convince me of that and I have no dusting (I'm sure that's next). Every single turbo I've seen had some minor discoloring on the blades that could be wiped away. Every. Single. One.
And I can tell the difference between dirt and soot.

 

[AH64ID]

Fleetguard AF's bad? Not a chance - you'll never convince me of that and I have no dusting (I'm sure that's next). Every single turbo I've seen had some minor discoloring on the blades that could be wiped away. Every. Single. One.
And I can tell the difference between dirt and soot.

Not sure... never seen soot on my turbo’s compressor blades. That’s all I’m sayin.

Did Fleetguard ever come out with a 4” filter? Last I looked they only had 2”, but that’s been a while. I only ran MOPAR filters on the 05.

 

[Prairie Dog]

Cant help with your lack of experieince.

 

[AH64ID]

Cant help with your lack of experieince.

I’ll take my lack of experience with soot on compressor blades as a good thing... I’d sure hate to have it the other way around.

As I said... I had a cam with enough overlap that manifold temps would increase with the exhaust brake on, still no soot in the intake.

Soot in the intake, without an external EGR, is an issue. Don’t care what your experience tells you.

 

[BigPapa]

Soot in the intake, without an external EGR, is an issue. Don’t care what your experience tells you.

Sorry, Scott, but if your truck is making enough sooty exhaust at idle that it “circulates around the entire vehicle at times and it gets sucked into the eng.”, it has SERIOUS issues.

 

[Prairie Dog]

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