2004 Nissan Sentra Troubles starting the car (sometimes)

Hi fher79rm,

Thank you for the donation.

Did you perform all the steps accordingly?

The timing is of utmost importance when carrying out the process.

Do you need any info on how to do it?

What manual are you using?

I have the IAV learning porcedures here. Check if it is the same.

Since engine was running well on the road and problem occurs only when stopped, it should not be the fuel pump. I would suspect the idling system is at fault and as no codes were recorded, the most likely cause would be idle air flow.

Your initial post mentioned that the problem was improved after doing the accelerator position relearn, I would suggest looking into this first.

It could either be a fault with the Mass Air Flow or Throttle Body.

Let us start with the throttle body.

Remove the air hose from throttle body and visually inspect the inner bore. If there are dirt accumulation, clean it and do relearn procedure and retest.

Spray some carb cleaner into the bore and any other ports in it. Let it soak for a while. Use a piece of clean rag and spray some carb cleaner onto it. Gently push onto the throttle valve and use the rag to scrub out any dirt accumulation. Spray some carb cleaner to clean and wait for the carb cleaner to dry out slightly.

Reinstall the air hose and restart to test. If the carb cleaner has not dried out yet, you might have difficulty starting. No worries about that.

You are welcomed and glad that your problem has been taken care off.

Yes, quite often when connecting hoses, reversely connecting them can cause problems which is never easy to resolve as it is easily missed.

Thank you for using 2carpros.