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Jay
Jay, Certified Infiniti Technician
Category: Infiniti
Satisfied Customers: 15085
Experience:  20+years, Nissan and Infiniti experience and currently now working for a Infiniti Dealer
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Infiniti G35 How can I fix high idle P0507 on 03 G35 seda

Resolved Question:

How can I fix high idle P0507 on 03 G35 sedan
Submitted: 3 years ago.
Category: Infiniti
Expert:  Jay replied 3 years ago.

Jay :

Hello and Thank you for using JustAnswer.com

Jay :

You said you replaced the throttle chamber?

Jay :

Do you have access to a scanner?

Customer:

yes

Jay :

You had a consult 2 hooked up to try to do the relearn?

Jay :

Do you have a consult?

Customer:

have a scanner

Jay :

ok, did you get the throttle chamber from the dealer, or your local parts store?

Customer:

yes the dealer hooked up a consult 2 got the idle down but it won't stick

Customer:

oem throttle body

Jay :

Ok, you got it from the dealer,.. correct?

Customer:

yes

Jay :

There is a few things that can keep the idle relearn to take.

Jay :

First thing I would check is the air and fuel mixture readings.

Customer:

?

Jay :

Other wise know on a Nissan .. Called Alfa..

Jay :

Or long Term Fuel Trim

Jay :

I would like to see what those readings are. If out of spec, it will never learn

Customer:

what should they be?

Jay :

Depending on how your scanner reads them;

Jay :

Around 100% if it can read Alfa,

Jay :

0 if it's long term fuel trim

Customer:

ok

Jay :

Give or take 5 or 5 %

Customer:

ok what would be next?

Jay :

Start the car, and monitor these readings

Jay :

make sure the car is fully warmed up. What is the car idling at?

Jay :

1100 rpms?

Customer:

gotta run outside ...1000

Jay :

ok.. Yeah check those readings. Also make sure you have the AC off, and head lights

Customer:

ok give me 10 mins be right back

Jay :

ok

Customer:

ok it's at 9.4

Jay :

Your running lean. That is to high and will never learn.

Jay :

It would need to be between 5 and -5 for it to learn properly

Customer:

ok so what do I need to do?

Jay :

First you need to determine if you have a air leak.

Jay :

Unplug the MAF sensor, and start the car and let it idle.

Jay :

See if the mixture readings drop to -25

Customer:

I've checked don't hear any

Jay :

If you have no air leaks, then you may have a bad MAF sensor causing the mixture to be off.

Jay :

I would try some MAF sensor cleaner on the MAF first to see if that will bring the readings down.

Customer:

should I do this with the p0507 code or clear it and do the pedal dance to get the idle down

Customer:

already tried to clean the MAF

Jay :

You can just start it. It will cause MAF sensor codes and Intake Air temp sensor codes, but by unplugging the MAF and looking at the readings will verify the MAF sensor is not metering air properly

Customer:

ok gonna run out and unplug the MAF

Jay :

If unplugged and the mixture readings drop to -24

Jay :

-25, that means you have no air leaks

Jay :

if it only drops to -15

Jay :

then you have a air leak

Customer:

ok brb

Jay :

-25 is the default reading

Jay :

k

Customer:

am I still looking at the LT fuel trim or MAF reading?

Jay :

LTFT

Customer:

k

Jay :

long term fuel trim

Customer:

ok with MAF disconnected it reads 0.0 idle went up to 1500 then started to stumble

Jay :

ok, it won't do it properly cause there is no relearn

Jay :

ok..

Jay :

Well I would get a can of MAF sensor cleaner and give the MAF a cleaning, then let dry, and reinstall.

Customer:

did that a few days ago

Jay :

Then clear the self learn, and double check the timing adjustments and make sure it's Zero.

Customer:

clear self learn?

Jay :

Then make sure your power steering switch or vent control valve are both off, and try to to perform the idle relearn, if you can get the mixture with in spec

Jay :

Yeah, when you do a idle relearn you need to clear the self learn

Customer:

I'm confused ...how do I clear the self learn?

Jay :

The cars have adaptive learning that learns on how you drive. You need to clear them in order to perform the idle relearn properly.

Jay :

I don't know on your scanner.

Customer:

oh clear the code

Jay :

I know on the Consult 2 it's in work support with the Idle Relearn.

Customer:

or clear the ecu

Jay :

You need to clear the code also

Jay :

But there is a setting to clear the self learn also

Customer:

I don't have a consult 2 but I can do the pedal dance to clear the self learn

Jay :

Do you have all the manual steps to perform a manual idle relearn?

Customer:

yes

Customer:

been doing the dance for 2 weeks

Customer:

ok u said to check the timing adjustments...how is that done?

Jay :

That is also done with the Consult

Jay :

If the timing is not at 0, it will also never learn

Jay :

That is all done under work support

Jay :

I can only tell you what I know with the equipment I use. I don't know what scanner you have and really have not worked with many other scanners other than the Nissan Consult 1, 2, 3 and Plus

Customer:

ok so lets say the timing is not at 0....does that mean I am stuck with this high idle?

Customer:

I'm using the actron CP9580

Jay :

I don't know that scanner and it's functions.

Jay :

No, you just need to have the dealer set the timing to zero for you

Customer:

where is this power steering switch or vent switch?

Jay :

The power steering switch is on the high pressure steering hose, and the vent control valve is in the back of the car connected to the evap canister which is on the drivers rear.

Customer:

are we talking about the same timing that can be advanced a few degrees for performance?

Jay :

yeah, that one

Jay :

make sure it's at zero

Jay :

There is also idle adjustments also

Jay :

that should be at 0 also

Customer:

if I remember correctly my timing was advanced when I had the ecu flashed

Jay :

Ahhh

Jay :

That could do it!!!

Jay :

For Sure!!!

Jay :

That needs to be turned back to Zero, then it should take the idle relearn

Jay :

Also make sure your idle adjustments are at 0 as well.

Customer:

yeah but this was done over 5 years ago

Customer:

ok

Jay :

Ecm flashing effects both those settings

Jay :

If it was done 5 years ago, it has never been changed, so it's most likely still adjusted to what ever it was set to

Customer:

ok before I take it to the dealer is it possible the MAF is bad and not throwing a code because when I disconnected it I saw the slip light came on the same way it did when this problem 1st started

Jay :

No, I would bet if you had the Ecm flashed, and the timing was advanced, that most likely is your whole problem

Jay :

I would have the timing and idle set to zero, then clear self learn, and have the idle relearn done again.

Jay :

The timing is normally not checked unless the dealer is told the timing has been tampered with as far as advancing it.

Customer:

damn so that means I will loose all my power gains with the flashed ecu?????

Jay :

Well once you have the relearn done

Jay :

Just have them put the timing back to where they found it, along with the idle adjustments

Jay :

Not a big deal

Customer:

Wheww u scared me for a min their Jay...ok guess I just gotta bit the bullet and go to the steeler ship oopss I mean dealer ship...thanks for you help!

Jay :

You got it. As soon as you mentioned the Ecm flash, that makes all the sense in the world to me.

Jay :

and have dealt with it many times, on 350z's and G's

Jay :

It's one of those things that when I can't get the relearn to take, I check those readings normally.

Jay :

or when another one of the guys in the shop can't get a relearn to take, I am normally called over and I check those and find that they have been tampered with.

Customer:

tampered? I prefer modified lol

Jay :

So I am sure just adjusting them to Zero, performing the idle relearn and setting them back will be all that is needed to be done.

Jay :

hehe

Jay :

When you work at the dealer, it's called tampered...hehe

Customer:

so I just tell them to set the timing back to 0 ...do idle relearn...set it back to where it was...u don't happen to be in NJ do u? Wouldn't mine bringing it to your shop

Jay :

I am in NJ

Jay :

Where are you located?

Customer:

Montclair

Jay :

Ramsey Infiniti

Jay :

is where I work

Customer:

Hmm where is that 17?

Jay :

Feel free to make the appointment, and request me, and I will take care of it for you.

Jay :

Yeah

Customer:

so just request Jay or is that your moon lighting screen name

Jay :

Just request Jay.

Jay :

That is my name

Jay :

I use to work at Lynnes.

Customer:

ok you guys work on Saturday?

Jay :

Yea

Customer:

Bloomfield?

Jay :

I am actually working this saturday

Jay :

Yeah

Customer:

wow small world

Jay :

yep

Customer:

glad u told me because I really didn't want to take it to Fette in Clifton

Jay :

If your going to make the appointment for saturday, try to make it later like around 1pm or something

Jay :

hehe

Jay :

Yea, I hear ya

Customer:

Ok Jay I gotta work this Sat but I am going to call and hope I can get next Sat

Jay :

Just let me know, If I need to come down and take care of this for you, I will

Customer:

come down?

Jay :

I am not working next saturday. But I live close so I can run down and take care of it for you.

Jay :

Just let me know what time you have your appointment

Customer:

u got a number I can text u or call u

Jay :

Personal contact is against our terms and services. But I am simply telling you were you can have your problem corrected.

Customer:

got it

Customer:

Ok I'm gonna call tomorrow and set the apt for next sat...don't know how I will get the time to you

Jay :

Just reply back to this question tomorrow and let me know.

Jay :

Thanks Jay!

Customer:

Thanks!

Jay :

You got it.

Jay, Certified Infiniti Technician
Category: Infiniti
Satisfied Customers: 15085
Experience: 20+years, Nissan and Infiniti experience and currently now working for a Infiniti Dealer
Jay and other Infiniti Specialists are ready to help you
Customer: replied 3 years ago.
Don't know if you received the message I sent....made the apt for Saturday 30th hope this works for you...I'd rather you handle this for me

Thanks!
Expert:  Jay replied 3 years ago.
about what time you bringing the car in?
Customer: replied 3 years ago.
Opps apt is 11am
Expert:  Jay replied 3 years ago.
Ok,
Customer: replied 3 years ago.
what's up Jay...just wanted to make sure Saturday @11 is still a go
Expert:  Jay replied 3 years ago.
Yup, I will be there around 11, even though it's my day off
Customer: replied 3 years ago.
I appreciate your help...dealership charge for relearn around a buck twenty ?
Expert:  Jay replied 3 years ago.
yes
Customer: replied 3 years ago.
Ok no problem "I got u"

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Expert:  Jay replied 3 years ago.

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Customer: replied 3 years ago.
What's up Jay...just letting you know the car has been running fine no codes, but I do miss my old flashed ecu tune...do you know any Infiniti tuners in the area? And thanks again for your help!
Expert:  Jay replied 3 years ago.
No, I am sorry I don't. Glad the car has been fine, and sorry about the loss of tuning program. But that seemed to be the only solution with the MAF sensor out of spec.

Thanks Jay!
Customer: replied 3 years ago.
No problem ..Oh I did get a OEM MAF sensor compared it with the old one and didn't really see much difference in the readings so I don't know if it's still running lean or not...I can say the gas mileage has improved...Have a good weekend!

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Jay
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20+years, Nissan and Infiniti experience and currently now working for a Infiniti Dealer