Low Idle fluctuation/Hesitation

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Fire0nic3

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I know some people have been experiencing problems with the RPM fluctuation at idle with your foot on the brake and/or at low speeds. Well here is a bulletin of what most likely is the issue you guys are talking about. I haven't experienced this problem, but earlier batches of the FX have had this issue. All it requires is a ECU reprogram which ofcoarse will be done for free under warranty.:tup:





ITB10042

  • IF YOU CONFIRM The customer reports any of the following: - Engine hesitation at idle or very low speeds, and/or - Engine speed drops lower than expected when decelerating or coming to a stop. ACTIONS 1. Refer to Step 2 in the Service Procedure to confirm this bulletin applies to the vehicle you are working on. 2. If this bulletin applies, reprogram the ECM. See this bulletin for further detail.
 
thank you for this as some may know i had and still do have this problem and still trying to resolve it with infiniti i am waiting on the technician from Nissan/Infiniti USA to come down to my dealer and take a look at her this problem is very annoying to have and some what scary to a point i do have some videos of this issue i will gladly put up tonight:frown:



Fire0nic3 said:
I know some people have been experiencing problems with the RPM fluctuation at idle with your foot on the brake and/or at low speeds. Well here is a bulletin of what most likely is the issue you guys are talking about. I haven't experienced this problem, but earlier batches of the FX have had this issue. All it requires is a ECU reprogram which ofcoarse will be done for free under warranty.:tup:





ITB10042

  • IF YOU CONFIRM The customer reports any of the following: - Engine hesitation at idle or very low speeds, and/or - Engine speed drops lower than expected when decelerating or coming to a stop. ACTIONS 1. Refer to Step 2 in the Service Procedure to confirm this bulletin applies to the vehicle you are working on. 2. If this bulletin applies, reprogram the ECM. See this bulletin for further detail.
Click to expand...
 
so is this going to solve the hesitation when you step on the gas at 3-4 gear cruising speed? my next service is coming up soon. I will make sure to get this done. But i'm afraid it will make it worse like the last reflash the dealership did...
 
threezero said:
so is this going to solve the hesitation when you step on the gas at 3-4 gear cruising speed? my next service is coming up soon. I will make sure to get this done. But i'm afraid it will make it worse like the last reflash the dealership did...
Click to expand...



you had a relfash done it got worst?
 
fxp35818 said:
you had a relfash done it got worst?
Click to expand...

it was great for a few days until the ecu "learn" my driving and it was back to how it was before, except now even in DS mode sometimes i get that hesitation. Before it was only in D mode. And the reflash not reversible.

I assure you i did not drive like a grandma during the learning period.
 
threezero said:
it was great for a few days until the ecu "learn" my driving and it was back to how it was before, except now even in DS mode sometimes i get that hesitation. Before it was only in D mode. And the reflash not reversible.

I assure you i did not drive like a grandma during the learning period.
Click to expand...

same here it took about two weeks until my problem resurfaced and now its ten times worst :-/ so infiniti/nissan promised to send someone to take a look at my car until then cant do anything.
 
This tsb has nothing to do with the transmssion reflash or downshift related issue. This specific tsb is for the idle issue where it fluctuates up and down an doesn't stay steady. What you are talking about threezero is a totally different thing.
 
Fire0nic3 said:
This tsb has nothing to do with the transmssion reflash or downshift related issue. This specific tsb is for the idle issue where it fluctuates up and down an doesn't stay steady. What you are talking about threezero is a totally different thing.
Click to expand...

the dealer did this ecu reflash with my car without asking me... now it takes 8.8 sec to do 0-60 with floored gas... any idea why? asked the dealer today, they said theres no way to downgrade the ecu...since this ecu came from a service bulletin, its more like a patch than a newer version to me.
 
That's bull. Tell them to call Corp to figure out how to revert back since they obviously did the wrong patch. And why would there be 'patch' ECU rather than everyone getting an update??? Almost seems sketchy as if the original problem is dirty throttle or something similar and instead of labor to clean or replace they put a patch ECU to make the car less responsive for those having that specific issue. That's just wrong I think!!!
 
jdTrader said:
That's bull. Tell them to call Corp to figure out how to revert back since they obviously did the wrong patch. And why would there be 'patch' ECU rather than everyone getting an update??? Almost seems sketchy as if the original problem is dirty throttle or something similar and instead of labor to clean or replace they put a patch ECU to make the car less responsive for those having that specific issue. That's just wrong I think!!!
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are you saying this program is more like a patch rather than a newer update? but it did fix the engine hesitation tho. I did some research regrading this TSB, it only applies to 2009-2010 model, but not the 2011 ones. lets make an assumption, 2011 fx35 had this patched before leaving the factory. could it really be an update since the 2011 doesnt have this tsb? The only thing i dont get is why would the car accelerate slower without engine hesitation?
 
jdTrader said:
That's bull. Tell them to call Corp to figure out how to revert back since they obviously did the wrong patch. And why would there be 'patch' ECU rather than everyone getting an update??? Almost seems sketchy as if the original problem is dirty throttle or something similar and instead of labor to clean or replace they put a patch ECU to make the car less responsive for those having that specific issue. That's just wrong I think!!!
Click to expand...



It doesn't have anything to do with throttle body. It has to do with a software glitch. That's why they need to reprogram the ECU.

If they can't reflash it back to the original software, just reinstall another ECU with the original software.
 
Fire0nic3FX said:
It doesn't have anything to do with throttle body. It has to do with a software glitch. That's why they need to reprogram the ECU.

If they can't reflash it back to the original software, just reinstall another ECU with the original software.
Click to expand...

the problem is, they deny the ecu in this tsb is a "path", told me its an update for every fx35 since everyone is complaining about the engine hesitation, the tech saw this update while working on my car, he reflashed it for you as being "PROACTIVE"

if this is what they are holding the whole time, i wont be able to find out whether its true or not. reinstall another ECU with original software, does it mean a brand new ECU chip? doubt the dealer would do it cost their money. Can someone whose fx had this ECU reflashed, tell me their results please:confused:?
 
You can easily get proof of your ECU software version to determine if you need a re-flash by requesting a printed copy that comes off the diagnostic system your dealership hooks up to the car. Next time your car is in for service you can request this - at least you will have peace of mind knowing your car is up to date.
 
phillyphanatic1 said:
You can easily get proof of your ECU software version to determine if you need a re-flash by requesting a printed copy that comes off the diagnostic system your dealership hooks up to the car. Next time your car is in for service you can request this - at least you will have peace of mind knowing your car is up to date.
Click to expand...

i do know the ecu version, its written on the service invoice paper, but the thing is i dont know which version is up to date for this car.

I wasnt informed before the car's ecu got reflashed, which was a dealer's mistake.

Last week, i went to the dealership and asked them to reflash back to factory default, two service advisers told me different stories, all tried to cover up the mistake they have done. both tried to fool me, saying how every fx35 get it done, reprogram ecu will not affect car's performance, and srry the ecu can't go back.

I guess im just too young to deal with them, i m gonna call infiniti corp and ask them about the up to date ecu version.
 
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