Intake Air Temp reading 6°F too high. Is this a problem?

SouthArk370Z

As stated, I had two digital thermometers and the dash agreeing on the ambient temp. I get IAT from the bank 1 MAF via OBD.

I would expect IAT to be above ambient when the car is running but I had let the car cool overnight. I'm assuming everything had time to equalize over the 9-10 hours* that it sat there. I could be wrong.

The "clock" sensor is mounted in front of the radiator, just a little off-center to the right.

I'm not an expert on engine control by any means, but, from what I've read, the MAF uses IAT to compute MAF and the ECU uses IAT to adjust how much fuel is injected. I wouldn't be surprised to find out that IAT is involved in valve and ignition timing calcs. How much of an effect IAT has, I don't know. Which is the reason for the original question. I suspect the answer is "Not enough to matter in your DD" but would like to get some advice from someone that knows more than I do.

Edit:
*I didn't pay attention to the time. It was probably closer to 12-14 hours.

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synolimit

How sure are you on this? I wanna move that thing and the bar it's mounted too but if its a air bag thing I don't want to touch it!



I think you're over thinking this. First off the car was designed to work so if it was an issue the car wouldn't have been released. Also, that time is probably not long enough. The engine can stay warm a very long time. And the block will "breath" while shut off into the manifold and intake tubes etc. that rubber is basically insulation and the filter can act as a blanket. Check again after 24 hrs and not in a garage, I'd like to see. Also, if the sensors weren't mounted in the intake tube like the MAF is, than it's not apples to apples really. Last the IAT doesn't change AFR. At certain temp points the ecu will pull timing to prevent knock, not fuel.

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SouthArk370Z

I'm very sure. Check the FSM to verify (or hold your fingers on the sensing tip and see if the reading goes up). On my '09, it's mounted to a vertical bar that is dead center on the car. Sensor is on right (your left when looking through the grille) side of bar.

I'm not all that worried about it; mainly just curious as to why there is so much difference. The car seems to be running fine. I am a bit concerned about possible long-term damage, but, not freaking out about it.

I'll try letting it cool down longer and see what happens. It will have to be done in the garage - lots of pine trees in my yard and the neighbor's and I don't want sap on my car. I have some small fans that I can use to help air circulation in the engine compartment.

Ah. Thanks for that bit of info.



Thanks for the input. I'll try letting it cool down longer tonight (I have some errands to run today).

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