2017 370z Nismo Intake Sensor Broken Already?
 

Hey guys,

I suspected something was up with my car a few weeks back. It felt like it was running sluggish in the afternoon temps. It wasn’t really even getting hot hot out just barely 80 degrees. When the Car went in for its first oil change and I mentioned this to the service manager. He said that everything was fine and there was nothing they could find. I still wanted to do a little digging so I bought a Bluetooth OBD II and downloaded Torque Pro. Well I think the picture says it all for this issue. My car has not been driven in 2 days and the intake temp inside my garage is reading 93.2 F. This is impossible. The temp inside the garage is about 65. I tested the two other Nissans we have and the IAT read around 60.0 F. I’m guessing at this point the car came with a faulty sensor from the factory as it only has 1,100 miles on it. I guess I’ll be making the big call to the dealer tomorrow. Has anyone heard of the sensors going bad/TSB for this just curious. Anyways I certainly suspect this could have to do with the reason the car is running so sluggish in the afternoon - the car thinks it’s 30 degrees hotter than what it is!!!

I certainly hope this is the answer you've been looking for! I'll be interested in hearing the relationship between a possible IAT sensor and your oil temps. This may go a little deeper than a simple sensor, and possibly corrupted code?

As I stated in your other thread, my oil temps are significantly cooler than yours under similar conditions/loads, and, like you, I'm still N/A for the time being.

Not so fast! I ran into the same issue with high intake temperature readings with my previous car (LS1 Corvette) on startup. My cheap Chinese OBD2 reader was giving me an abnormally high IAT compared to ambient temperatures. I too suspected a bad IAT sensor and came to find out later that my OBD2 was the culprit. It, for some reason, could not properly read IAT. Just double check those readings with another OBD2, if you can. Try driving your car for a while to see if that temp varies some.

Interesting..I thought that as well. I guess what leads me to believe otherwise is that I tested it on 4 other vehicles and it’s definitely reading acccuratley. I’ll either have to grab a 2nd OBD2 or just take it to the dealer for some diagnostics. Thanks for your reply!!

Cyber,

Let me ask ya...did your OBD2 only act up on the Corvette and did you try it on other cars with the same result. Reason I ask is because I have correct readings from an 08' Versa, 16' Rogue, 03' Maxima, 04' Santa Fe...The Z is the only one giving me this crazy reading...

Take it to the dealer and have them read the IATs. If you have to, make them get another Z warmed up equally to yours and compare the two. Definitely something screwy going on with yours.

I'm with you on the OBDII reader. If it works on several other vehicles and appears to be accurate, I think you can safely say something on the Z is the culprit.

IIRC, IAT is measured with the right (passenger side for US cars) MAF. Swap MAFs and see if OBD reading changes.

If it's reading 90s right at start up when everything is in the 60s then there is a problem. But if it's rises to the 90s after startup then thats normal. Idle in the garage does not move a lot of air so the air has plenty of time to heat up to the temp of your engine bay. For me it's normal for the air temp to get into the 90s or higher while sitting in traffic but as soon as I get to highway speeds to IAT gets to only a few degrees above ambient temps.

The engine was off..just had it in the 'on' position to get the reading. Something isn't right.

Good question. I did not try mine on any other car but I did compare it to another OBD2 scanner (GM Tech 2). The Tech 2 is the benchmark and it gave me normal readings.

So this proved that my cheapo OBD2 was worthless. I think that it just had wrong calibration because all IAT readings were erroneously reported above 100 F.

You may very well have a bad IAT but in my case, I was glad I counter verified my readings with a quality OBD scanner before I started throwing money at my car.

I will bring it to the dealership and report back...

Well I brought the vehicle to the dealership yesterday. In short there is no issue found with the car.

They connected the Z to their computer and checked all stats while the car was driven and at idle. Everything came back in check.

However...Some interesting information I would like to share...they were able to replicate my concern where the intake temps were high & rising with the car in the on position, engine off...The advisor who is a Z specialist as well as a Z owner himself tells me that he was not 100% sure but he has heard of heating elements inside of these sensors. I did not get a definitive answer whether the Z has this but he was leaning towards that as a possibility. Turns out my $12 OBD2 and Torque pro app are in fact very very accurate...

I think the heating elements are only in the exhaust O2 sensors. They need to be hot to read correctly.

You may be right...I cant confirm that its true. He was looking at all the wiring diagrams and saw something that may have indicated that on the intake sensor. Anyways she's driving well, all the stats look good and I just finished the break in period..ready to go past 4k :happydance: