Biochem7

iTrader: (8)

Anybody else have this problem? My setup is Vortech with UTEC. I originally had my idle set to ~1,000 RPM. However, my idle has never been correct and lately its been around 1200 RPM causing DTC P0507. When I do the idle air relearn procedure, my idle will drop to ~850 RPM, but when I restart the car it goes back to 1200 RPM. Its like the ECU will not remember the relearn procedure. I have searched this forum and google and looking for any insight before I go to the dealer or buy a new Throttle body.

Thanks for any feedback.

str8dum1

iTrader: (11)

the relearn does not change the target idle. do you have a boost/vac gauge? Is it at -18 to -20 mmHg at idle? if not, might have a vac leak.

also, 1000 rpms is to much to begin with. go to the dealer and have them drop it to 850-900.

or if someone has a cipher cable new you (since you are in austin), just use that.

drumminguy81

iTrader: (19)

i had the same problem i just kept trying over and over and finally it worked and stayed, be sure to do all 3 relearns including the throttle pedal position prior to resetting the air volume relearn.. after i finally got mine to work the cel went off but now my car wont idle for crap dies at stop lights lol just ordered a cipher cable to adjust target idle up a bit without a cel..

athenG

iTrader: (2)

timing is critical so you may need to do it a few times. It took me 5 try before I got it right but if the problem keeps coming back then you need a new TB. Does your idle still above 1K even after letting the car idle for 5mins? After a restart it takes a while before my idle goes back to 8xxrpm in my car.

Biochem7

iTrader: (8)

Actually its around -20 mm Hg at idle. I thought the re-learn resets the idle. Can the dealership reset the idle?

Biochem7

iTrader: (8)

Yeah I though about that. I think having the UTEC may throw off the timing. I tried switching to Map "0" for the re-learn; bad idea with 650 cc injectors

I have tried re-learning multiple times. I may need to check the IC piping to make sure I don't have any leaks? Is it possible that I need to clean the MAF?

athenG

iTrader: (2)

Yes, cleaning the MAF and TB will definitely help.

fpacquing

iTrader: (11)

clean the throttle body,there is probably some sort of debri between the throttle plate;then do the learnig procedure

Biochem7

iTrader: (8)

I cleaned it by spraying a rag with TB cleaner and wiping down the throttle body and plate gently. I have read that moving the plate with your hands may damage the TB. I can't remember if I may have done this in the past.

The ECU just will not remember the relearn process. Other than this problem, my car runs great....very frustrating!

str8dum1

iTrader: (11)

its not an idle relearn! its a throttle body position reset. that only chenges where the throttle plate thinks it is. your car will still search for the idle that is programmed into the ECU.

but keep trying the relearn. I'm sure it will work one of these times

Biochem7

iTrader: (8)

Okay, maybe I'm confused. But according to the FSM, there is a "throttle valve closed position learning" and a "idle air volume learning" procedure. The latter does not reset the idle? Can the dealership reset the idle back to normal?

athenG

iTrader: (2)

If you go to the dealer the first thing they will tell you is buy a TB. I went to Nissan and when I mentioned my P507 error they already made up their mind that I need a new TB. Of course I didn't listen and tried to do the relearn myself and that fixed my problem. If the problem persist then maybe you really need a new TB. I also changed my MAF and that help me stabilize my idle..

Biochem7

iTrader: (8)

any more suggestions?

athenG

iTrader: (2)

Did you try to swap out your TB? I mean if the error keep coming back then maybe your TB is a going bye bye. The code does serve a purpose and it pretty much tell you what part is malfunctioning, you cant just hope the error goes away without fixing the problem.

Biochem7

iTrader: (8)

the thing is when I do the relearn the idle will drop down to ~850 RPM and will idle correctly until I restart the car. Then it idles back at 1200 RPM. I would assume that my TB can idle correctly and that the ECU just can't remember. I am about to just buy a TB. Anybody have luck with remanufactured TB from Nissan?

athenG

iTrader: (2)

Idle should go down well below 850rpm when you do a re-learn so if that is the lowest your RPM goes then there is a problem.

Biochem7

iTrader: (8)

Yeah, I had my idle bumped up by a tuner. Can the dealer adjust my idle?

surfcity40

very interesting advice, but possibly inaccurate.

TB position sensor is my guess.

athenG

iTrader: (2)

The dealer can adjust your idle but once they see the P0507 error I'm pretty sure they will immediately suggest replacing your TB.

athenG

iTrader: (2)

Then blame Nissan coz that is what they insist when I complained about my P507 code...