Hey Guys, I am new to the Z and ever since I got the car a few weeks ago it had idling problems. I didn't think it was a big deal, so I kinda looked past it.
Any how the car when I got it and it was really warm, when I would stop at a stoplight or anywhere else after a few seconds it would kinda bog and if i didn't give it gas it would die. I read up on the TB threads, and how that caused most of the problems, and the MAF, i decided to clean both. After cleaning them the car seems a lot better, but it idles high (it always idled high before) now it only idle high when its in park. When it's in gear and i am stopped it doesn't idle high. Any idea what it could be? I am missing the rear o2 sensors are those needed? The car has high flow cats with nvidia n1 exhaust. Anyhow I just got the o2 sensors and will have them installed tomorrow...i am wondering if that will cure the problem, or could it be something else. Did I just waste 300 bucks in sensors? They are still wrapped so I could return them. Thank you

 

It's probably the camshaft sensor that is causing your problem. --Spike

 

I had a similar issue, especially on cold starts

After a TB replacement everything went back to normal

 

Check and make sure the arrows all line up on intake pipe with your mass air flow sensor, check for a 5v reference on your cam position sensor, also could try to disconnect the battery (-) for a half hour

 

Your o2 sensor communicates with the pcm, telling it to ritchen up (add fuel) or lean out(remove) the air:fuel ratio. id start there with the new sensor, also will need to clear the fault code.

 

Duhhh my cars missing o2 sensors, i dont get why its not running right...
FAIL
..seriously dude?

 

its missing the rear o2 sensors and if you do some research you can see they are not used to tune the engine. A lot of people are running their cars without rear o2 sensors with no problems.

 

im thinking the same...just wanna make sure i try everything before buying new TBs

 

I will look into it...thanks Spike!

 

i should mention i did all relearning procedures several times..unplugged battery overnight and it still high on park. I have not looked into cam shaft sensor.. I had CEL checked nad it comes back with p0507

 

I think I might have finally gotten this figured out. I did the relearn procedures over 20 times and they never seemed to work. Then I started seeing this are for older zs too so maybe since mine is an 07 w HR engine it may be different. Sure enough I looked up 370z reset and it worked for mine this is what I did to reset ECU light and it worked first try.


1. Turn key to 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. ECU reset is done!


Then for the relearn idle I did it like this

1. Perform EC-42, "Accelerator Pedal Released Position Learning" .
2. Perform EC-42, "Throttle Valve Closed Position Learning" .
3. Start engine and warm it up to normal operating temperature. (I drove it 15 mins)
4. Check that all items listed under the topic PREPARATION (previously mentioned) are in good order.
5. Turn ignition switch OFF and wait at least 10 seconds.
6. Confirm that accelerator pedal is fully released, turn ignition switch ON and wait 3 seconds.
7. Repeat the following procedure quickly five times within 5 seconds.
a. Fully depress the accelerator pedal.
b. Fully release the accelerator pedal.
8. Wait 10 seconds, fully depress the accelerator pedal and keep it for approx. 20 seconds until the MIL stops blinking and turned ON.
9. Fully release the accelerator pedal within 3 seconds after the MIL turned ON.
10. Start engine and let it idle.
11. Wait 20 seconds.
12. Rev up the engine two or three times and make sure that idle speed and ignition timing are within the specifications.
13. If idle speed and ignition timing are not within the specification, Idle Air Volume Learning will not be carried out successfully. In this case, find the cause of the incident by referring to the DIAGNOSTIC PROCEDURE below.


It may be stupid but those extra 3 seconds is what made the difference.

I found it here! http://www.the37zeroz.com/engine-dri...ve-method.html

zero is obviously 0 in link..sorry i think credit should be given where its due...