Hello everyone, I recently purchased an 03 g35 sedan and the drivers seat frame was broken (exactly like this https://g35driver.com/forums/g35-sed...eat-frame.html ). So i disconnected the battery and removed the seat to repair it. The battery was disconnected for two days and now when I turn the car on it will idle very low and stall. However, if I rev it and keep it around 1000 rpm for a few seconds and then let off it will settle at 450-500 and will not stall or idle lower until I turn the car off and start it again. As far as I can tell, there are no air leaks, I had replaced the spark plugs before this happened (it was idling fine at 700-750 and no stalling), the throttle body is perfectly clean, and I've tried resetting the ecu as well. I'm confused as to what the problem is, any help would be appreciated.

Thanks
-MadSpartan

 

did you play with the butterfly valve on the throttle body? If so, there are a few procedures to correct this. I'll search for them now.

 

before you do these steps... make sure the car is warmed up, all accessories are off. Such as the a/c, rear defrost, any vanity lights, etc. The steering wheel should be straight.

How to reset your ECU and perform the Throttle Pedal Release and Idle Air Volume Learning procedures on an Infiniti G35 and the Nissan 350Z.

Before attempting any of the following procedures, it is advisable that you read through the instructions thoroughly and familiarize yourself with them.

A stop watch or an analog clock with a second’s needle will be useful.
**a quick reset can be accomplished by disconnecting the negative battery terminal, and depressing the brake a few times.

ECU Resetting Procedures

Timing is extremely critical. If it is NOT DONE within the specify time, the ECU will not reset and the Check Engine Light (CEL) will continue to remain ON.

Operations Procedures

1. Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
2. Repeat the following steps (2a and 2b) procedures quickly five times within 5 seconds.
2a. Fully depress the accelerator pedal (HARD).
2b. Fully release the accelerator pedal.
3. Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking.
4. Fully release the accelerator pedal (while the CEL is still blinking)
5. Wait about 10 second.
6. Fully depress the accelerator pedal and keep it for more than 10 seconds.
7. Fully release the accelerator pedal (The CEL light will continue to blink).
8. Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone.
If the CEL light continues to remain ON, repeat the above steps. Timing is EXTREMELY critical to resetting the ECU.

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 to “ON”.
3. Turn ignition switch to “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.

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. Confirm that the accelerator pedal is fully released, then 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.

it may take a few times or even an hour to get right lol

 

Check that the maf sensor is fully plugged in, possibly clean it and that all connections are secure on intake tubing. You could have a leak that's not popping a check engine. Did you hook back up the hose on the tubing?

Try disconnecting the negative terminal on the battery and pump the brakes 5 times to quick reset the ecu.

Good luck my friend.

 

Thank you for your suggestions. I had already reset the ecu but I had not tried the other resets you listed. I went throughout my intake and made sure everything was tight to make sure I had no leaks. I then did the other resets you listed. Now she no longer stalls on startup but still idles around 500-550. ¯\_(ツ)_/¯
Better than it was but still seems low to me.

Thanks again.

 

Honestly think you are in the clear. Normal idle is 650 +/-50. Remember the first hash mark is 500 rpm. Cheers on no more stalling! If you have a obd2 scan tool that shows live data plug it in and look at rpms. My idle shows 900 but the scan tool shows 650.. go figure also my vss is 5mph off. No big deal lol