Any ideas why my 09 g37s coupe 6mt idles slightly higher than normal? Isn’t it supposed to be like 600? My car idles at 1k-1.1k?

 

Have you cleaned the throttle bodies recently? if so, you might need the perform a Idle Air Volume Learning (Throttle Position Learning) to correct your issue. Even if you haven't cleaned the TB's you should perform the process anyway. I would suggest performing all the re-calibration protocols to insure you cover all the bases. Written instructions are below but also here's a video:


Resetting The Throttle Body Calibration:
A Rough Idle or a SES can sometimes be caused by a change in the throttle body position sensor calibration. To correct any accidental changes in throttle body calibration, use these procedures to re-calibrate. Note: These procedures are a little tricky to do. You must get the timing just right. Use a stop watch to help the precision of your timing.

Accelerator Pedal Release Position Learning Procedure.
Make sure that the accelerator pedal is fully released.
Turn ignition switch “ON” and wait at least 2 seconds.
Turn ignition switch “OFF” wait at least 10 seconds.
Turn ignition switch “ON” and wait at least 2 seconds.
Turn ignition switch “OFF” wait at least 10 seconds.

Throttle Valve Closed Position Learning.
1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch is “ON”.
3. Turn ignition switch is “OFF’ wait at least 10 seconds. Make sure that the throttle valve moves during above 10 seconds by confirming the operating sound.

Idle Air Volume Learning (Throttle Position Learning) It's best to time with a watch/clock.
1. Perform “Accelerator Pedal Released Position Learning”.
2. Perform “Throttle Valve Closed Position Learning”.
3. Start engine and warm it up to normal operating temperature.
4. Turn ignition switch “OFF” and wait at least 10 seconds.
5. Conform that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
6. Repeat the following (steps 7a, 7b) procedures quickly five times within 5 seconds.
7a. Fully depress the accelerator pedal (HARD)
7b. Fully release the accelerator pedal.
8. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the Check Engine Light (CEL) stops blinking and turned ON. .
9. Fully release the accelerator pedal within 3 seconds after the CEL is ON.
10. Start engine and let it idle.
11. Wait 20 seconds.
12. Rev up the engine two or three times and make sure the idle speed and ignition timing are within the specification

 

Thanks that’s fixed the issue! Idles at around 600 now

 

Glad to hear and can’t thank enough for the many resources we all have here.