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Engine Tech Technical discussion related to all relevant engines such as KA, SR, RB, CA, 2JZ , L24/26/28, VG, VQ, and LSx series.


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Old 04-21-2018, 02:05 AM   #1
240silvia
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s14 SR Cold Start Issue

What's up guys. On a cold start I do not get the standard "higher idle" like I should. Instead, on a cold start I get a lower idle initially and then it levels out as the engine warms up.

I purchased the car with the swap already done. I've always had this issue. It has an RS-Empathy tune so I expect the initial idle to be stingy on a cold start. Once the car is on for a few mins it sits around 750ish so I do not believe I have an issue with my IACV. I've done some research and from my findings, the FIC "Fast Idle Cam" on the throttle body plays a big role in the higher cold start idle. The engine has an aftermarket 70mm throttle body and it does not have a FIC.

So I'm curious, does everyone with a 70mm throttle body have this issue? Is there something else I should check? Any insight will be greatly appreciated. Thanks guys.
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