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Discussion Starter #1
Hi all.
I have a 2012 Frontier SV V-6 auto 4X4 with 165,000 km. When it's warmed up at a stop light the idle will drop till it almost stalls but it never stalls. The idle return to normal rpm but idles a bit on the rough site. Truck runs great other then that. It's been doing that since I've owned it but have doing my best to ignore it. Any ideas?

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How long has that been? that you owned it? no lights? have you checked for any code or pending codes?

I'm grasping at straws here but it kinda sounds choky maybe air leak related like Idle air control valve but don't think ours has it. Look at this item maybe Control valve solenoid on it's way out they're located on both valve covers front of engine near timing I've read other members complaining of kinda of same symptom as you but they have a code set for it. Or possibly an air leak

Doesn't sound fuel but have you ever run a cleaner through fuel like chevron techron or I use berryman its cheap and it works

With really nothing to go on remember straws lol
 

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Discussion Starter #3
How long has that been? that you owned it? no lights? have you checked for any code or pending codes?

I'm grasping at straws here but it kinda sounds choky maybe air leak related like Idle air control valve but don't think ours has it. Look at this item maybe Control valve solenoid on it's way out they're located on both valve covers front of engine near timing I've read other members complaining of kinda of same symptom as you but they have a code set for it. Or possibly an air leak

Doesn't sound fuel but have you ever run a cleaner through fuel like chevron techron or I use berryman its cheap and it works

With really nothing to go on remember straws lol
It's been there for 3 years, 60000km. It's not a real problem just annoying. It's never stranded me. There are no code, check engine light etc. I have ran a can of Seafoam thru it with no difference.

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Nissan 'might' bump your idle up...but no guarantees they will, though.
 

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You might want to try doing this(copy and paste from another Nissan forum).

ECU Resetting Procedures

The Easy Method:

After experimenting with different timing, and reading posts by other members, I've come up with a condensed method of doing this reset. This method works EVERY time, even w/o a stopwatch. I've used this method successfully a dozen times, or so, now w/o a watch. After a few times, you won't need a watch or instructions. You'll get so darn good at it, you'll find yourself doing it while waiting at a traffic light.

Timing is not as critical with this method...no stop watch needed. Just count in your head...one-one thousand, two-one thounsand, etc, or use stop watch. The most critical step is step #3....wait 10 sec, instead of 7.

1. Ignition "ON", count to 3.
2. Depress/Release pedal 5 times...hard and fast.
3. Count to 10 (not 7!) and fully depress pedal
4. Count to 12 (SES should be blinking), release pedal
5. Count to 10, depress pedal
6. Count to 10, release pedal.
7. Turn off ignition, then start engine. Done!

Accelerator Pedal Release Position Learning
Operation Procedure

1. Make sure that the accelerator pedal is fully released.
2. Turn ignition switch “ON” and wait at least 2 seconds.
3. Turn ignition switch “OFF” wait at least 10 seconds.
4. Turn ignition switch “ON” and wait at least 2 seconds.
5. Turn ignition switch “OFF” wait at least 10 seconds.

Throttle Valve Closed Position Learning
Operation Procedures

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 is better to count the time accurately with a clock.
Operation Procedures
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 specifications.



Your idle issue may be a combination of the Idle air Volume and Ignition timing. You might want to try removing the maf sensor and cleaning it with the appropriate cleaner. You also may want to remove the intake piping and see if the throttle body had build up on it.
 
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