NefMoto

Hi all. I have a problem with idle from some days.
What i saw is rpm at idle fluctuate between 720 and 780 and with it afr fluctuate between 14.2 and 15.7 and in the same time the timing advance fluctuate between 10degree and 29 degree ( i defined my kfzw and kfzw2 at 800 rpm and 10% load with 29 values).
I specify next thing are ok and tested:
- no  leak vaccum/noboost
- maf is ok
- map is ok
- vvt is ok
- engine haf only 4000km (all new inside)
- all negative wires are ok
- o2 wideband sensor is ok , had only 4000km too
- 02 second sensor is disabled
- no cat from years

Who is first who cause this thing? timing , afr or voltage?
Some advice please?

Thanks

The tuner  8)

hahahhaha, what a joke.......car works greate before 2-3 days ago.........something happened..........the tuner was the same......the tuner am i, so fogot about the tuner

coolant temp sensor? crank position sensor? throttle body sticking/needs adaptation? accel pedal pot?

definitely a hardware problem, these things are hard to track down.

thanks again nyet
-coolant temp sensor is ok , verified with iat sensorat the cold starting
-throttle bodu was cleaned 4000km before when the engine was build , and it s clean now too
-throttle position was logged and it is ok
maybe crank sensor , but i think it must make problem in the running too
i suspect a big consumption who influence the injectors and coil
i will write here when i have a result

for the moment i don't find the problem
suspect the cranck sensor or an injector

Going off of information that you have pisred and what you described.....

Thatss pretty big swing for timing. When I have had this happen before actual load was greater then request and pissed it off.

Do a log and watch your request load and actual, and warch throttle plate angle... if your kfmirl and kfmiop are good, and kfped is sane.. you could try numbing wdkgugn a little at that rpm.

if this isn't the accel pedal pot, make sure to check accel pedal signal.

thanks guys , will check these days

Hi Auriaka. About my problem , is not on the running, it is an idle. I don't modified irl/iop and kfped. They are the same from 1 year and the car works ok at idle.

Problem not resolved.
I checked every hose , every valve........nothing broken, no leak.
Aster 1 minute at idlr Afr goes crazy.
KFPED standard
IOP and irl stock before 150%.
KFMRES stock
MLHFM stock with stock maf case+sensor.
I resolved adaption at idle to be constant and looks ok 0.8% but afr and lambda control after 60 seconds goes crazy.
It is 5120 hacked file.
TEMIN and TEMINVA are 0.3 for 731cc injectors.
Torque intervention is disable!
Can be from the map sensor 4000mbar because it's minimum value can read is 500mbar?
I tried to put idle rpm at 800, but seems a little better.

Please some advice.

Can you try with a non-5120 hacked file? Yes, you won't be able to read high boost, but at least to see if the 5120 is causing the idle issues.

I had the same setup with same tvub and krkte on non hacked file. Idle was much better.
Forgot to say i use 4bar fpr with krkte 0.04951 , temin and teminva 0.3 and next tvub
8v   2.00
10v 1.29
12v 0.86
14v 0.56
16v 0.44
All fkkvs kfkhfm and kflf are 1 not touchd yet.

I don't have any solution to resolve this, what is strange idle make like this from time to time and especially when colant temp is over 90 degree!

Go back to stock and then check to see if it still fluctuates.. Throttle body could have gone bad... I chased my tail for awhile until i pulled throttle body off and looked at it in the light. Body wasn't closing all the way all the gears and stops are plastic and it wont seat properly and bounce closed to open!

Thanks for your opinion but i replaced the throttle 2 weeks ago to test if is its fault. IT doesn't.

Hi Nyet.
I made a new stock file with all "setup"/maps from 5120hackked file witch i modified. I keep the 4 bar map sesor and calibrated with the same values from 5120hacked file but multiplied with 2.
After 30 km , the car feel good , not idle fluctuation.
Maybe something is wrong in justinve 5120 hack file. I verified all maps and scalars from your xdf from your project and they are correct, multiplied or divided by 2.Hope not missed someone.
"One thing that really bothers me and I haven't got the aswer is that this hack is for 5bar map sensor and since stock is 2,5bars I understand that we need to divide or multyply by 2, but since we are using 4 bar sensor, which is like 80% of 5bar, so maybe it would be reasonable to multyply/divide tables by 80% not 100%?"
Thanks

This is why you should not use other's people ASM modifications :(
In theory on stock ECU you can use even 10bar MAP sensor - it is just most part of it measuring range would not be ever used.

There could be things missing, since ME7.5 has some significant diferences

This is mixing the 5120 hack with change in map sensor. Do not conflate the two. They are two *separate* changes.

Do one, then the other, independently.

If you have to

make sure the new sensor works in an OEM file with ONLY the two pressure sensor *map* changes for that sensor, not ASM

make sure the *OEM* sensor works properly with the 5120 hack (verify the 5120 changes - ASM, 2x&1/2x axis changes, map changes)

Then make a third file with both changes, where the adjustment for the new sensor is again ONLY in the two pressure sensor maps, not ASM or axis changes

i made it today and after 30km i have no issue with idel


i made this and had idle fluctuation but not so much as with 4 bar map sensor, maybe for OEM sensor resolution is less than 4 bar sensor (ecu is more sensible for voltage variation)


i posted its log 2 days ago, it is a disaster with idle fluctuation, after my opinion the 5120 hack file had a problem.
i don't know to see / write/verify asm changes
i verified only maps and scalars conform with attached tct file

Need to share the file to look at it. can PM me ill help.

No sweat glad going back to stock did something for ya!I dont know much yet but one day id like to contribute!

Hi, did you solve idle fluctation problem? I have identical situation like yours after 5120 hack

Yes!
FKKVS at low rpm and TVUB.

Thanks
Do you remember, TVUB or FKKVS was more important?

VERY important, and you can try KFBAKL And KVAKL!