Cold start idle jumping high

[Akshaya]

Hello all!

Wondering if anyone has had a similar issue with their Z's. I have a 2015 370Z nismo tech that I have modified quite a bit. I got an Uprev tune from Intec racing about a month ago due to some of my parts requiring a retune after being installed and the car ran great (with the exception of it sputtering a bit almost like the ABS was kicking in past 5k RPM intermittently). However, about a month after my tune, the car started acting weird on cold starts. Usually on the first start of the morning, the car would fire up and just start reving on its own. It typically sits around 1800 rpm's when cold starting, but no it typically start at 2500 and it will rev up to almost 4K RpM's and keep going back and forth between the two. Once the car has been on for about 30 seconds to a minute, it will idle normally and run fine. I've already checked for vacuum leaks and found nothing. I even had a friend of mine who is a Nissan tech check and he couldn't find any leaks. Anyone have any ideas on where to look next? I have an appointment on Friday to get it looked at by the guy who tuned my car at Intec but I want to rule anything else out before going there. Any thoughts are appreciated! The mods done that could affect this are as follows:

-Ported intake manifold and plenum
-big bore throttle bodies
-stillen gen 3 intake
-long tube headers
-cat back exhaust
-Uprev tune with arc

[lj909]

It's the throttles and tuning. Are they eps? They have a whole list of codes that have to be disabled when using uprev in the instructions.

[Akshaya]

Yeah they are the EPS! I could see how that would cause the car to react like that! That's great to hear that it could be something super simple. I'll see if I can find the codes tonight!


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