2004 altima 2.5 issues

Jeanette Parsons · Mar 22, 2015

Hi everyone, a little over 2 weeks ago I bought my first nissan. It is a 2004 Altima 2.5 with 201,000km. The car worked great initially, until I had the flex pipe replaced. Since then the check engine light has come on with code P0507 idle air control system rpm higher than expected. I should note here that the check engine light was on prior to having the flex pipe replaced, but I didnt check the code. It began stalling only when put into gear, it idles fine in park and neutral. Sometimes you cant even take the car out of park and it will stall, other times its like it has a bad hesitation, and sometimes it works just fine. I have been all over the net and I have tried replacing the throttle body and crank sensor. I have also taken it into nissan to have the pcm reprogrammed as part of the recall, and I have tried resetting the code and the idle relearn process countless times. I am now at a loss, I have no idea what I could possibly try next to determine this cars issue. I thought I would join this site and make a post in the hopes that this could be a common problem that someone has experience with.

Any and all input is greatly appreciated, many thanks!

MIKEKN · Mar 23, 2015

I don't know if it's a common issue or not but here's what to check next:

1. CHECK the PCV hose connection.
Make sure it is connected at both ends, is tight and that the hose is in very good condition, particularly there are no cracks, pieces missing, etc.
You can check the PCV valve to see if it is stuck open.
Just remove the pcv valve with the engine off and shake it. You should hear it rattle. If you don't, it is stuck and needs to be replaced.
PCV valves are a lot cheaper than electronic parts, so you might want to just change it anyway.

2. Check for an intake vacuum leak
Start engine, let it warm up a bit and listen for an intake vacuum leak, anywhere after the mass air flow sensor.
Sometimes it's as simple as a loose clamp.
Other times it is not so easy to find.

The last option is that the ECM is bad.
Before I would condemn the ECM, I would be sure to very carefully check that there are no corroded connections or broken wires.

d0ugmac1 · Mar 23, 2015

Before you spend any money...try this

http://www.nissanclub.com/forums/f-q-2002-2006/121664-idle-air-volume-learning-procedure.html

Jeanette Parsons · Mar 24, 2015

Thanks! I will replace the pcv valve this week and see what happens, I will also check for some vaccum leaks. Thanks for the advice!

Jeanette Parsons · Mar 24, 2015

D0ugmac1, I have tried this procedure countless times to no avail

Thank you for the suggestion though!

2004 altima 2.5 issues

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