Looking at buying a used G37S from a local Infiniti dealer and got a pre-purchase report on it from the dealer. The inspection indicated that it had some sort of aftermarket intake air temp sensor that was changing the air/fuel ratio. Is this a common mod on these cars? Any concerns I should have with one of these possibly causing the motor to run TOO lean? Other mods are a different intake (assuming some sort of short ram), and a catback of unknown brand. Everything else is stock. Not sure if the different sensor is a part of a kit for either of the other mods or not. Any insight?

 

The air intake sensor for the G37 is built into the MAF sensor and sits on each intaketube towards the front or midway between the air filter and throttle body.

You should have two, one on each tube.

Is your setup different?
If it is the same and they are saying there is something funky about your current pair of MAFs then replacements are easy to find, easy to install and shouldn't be very expensive.

 

It has the factory location for the IAT sensor, but they are not factory modules. The on the pre-purchase inspection the dealer described it as "air intake temperature sensor is removed and aftermarket module is plugged in its place to fool the computer into adding more fuel than normal"

 

Have the dealer install OEM modules and maybe intakes as part of the deal.
You'll notice how many hoops people here jump through to get their cars back to OEM before selling or trading in.
This should be taken into account on the price.
As well as the comments about possible damage from running lean.

I'd want some written assurances about the condition of the engine and how long they guarantee it for....or a price that compensates for it. (Below avg price for a similar car)

 

Come to think of it, neither R2C nor Stillen nor any of thr name brand intakes I can recall, requires special MAF sensors to compensate, and I'd be worried what it's doing to accomplish it.

For all we know, he had a turbo or SC on and they swapped it out for the resale, and will blame the lean damage on the MAFs and intakes used by the next owner (You).

 

AEM uses aftermarket sensors calibrated for their intakes. Might be AEM units.

 

Interesting, I never knew that. I was going to say maybe it was an UPREV MAF sensor like some Stillen supercharged setups run, but your idea sounds much more plausible.