Performance Problem

[antiliopoulos]

Hello guys.

If someone could help me with my problem i would much appreciate it.

I own an octavia 5 1.6 FSI (BLF engine code).

I have the last 2-3 years perfomance problem with my engine.

The symptoms mainly consists of hesitation of the car to accelerate properly and i noticed a noticeable increase in fuel consumption.

At this point i must add that despite the poor performance no MIL would come on the dashboard, hence making the solution for the problem to my mechanic

more difficult.

I have changed so far these last 2-3 years the high pressure fuel pump, g410 low pressure sensor, i even changed the timing chain

and associate parts because according to my mechanic it was worn and was failing.  Nonetheless the problem still persists.

Thankfully the last 2-3 months an indication appeared(engine) on the dashboard and i was able to prove my saying to him.

He determined after diagnosing with vcds that the low fuel pressure was too small. At some point under load would come down below 2bar.

So he recommended replacing the in tank pump and control module.

I tried replacing with an aftermarker pump but the problem still continues to exist.

The vcds Log is as follows:

 

Address 01: Engine Labels: 03C-906-056-BAG.lbl
Control Module Part Number: 03C 906 056 BS HW: Hardware No
Component and/or Version: MED9.5.10 00 8544
Software Coding: 0000071
Work Shop Code: WSC 73430 790 00000
VCID: 75E1075F1C34EDB6B75-8020
1 Fault Found:

18972 - Low Pressure Fuel Sensor (G410)
P2540 - 008 - Implausible Signal - MIL ON

Readiness: 0000 0000

 

If i erase the error, the indication won't come again instantly. It takes some time to reappear.

From what i managed to find out is that when i adapt the fuel pump and adaptation states that is OK at some point the adaptation

changes to error and the MIL indicator comes up on the dashboard.

Hope i didn't tire you with my long post.

 

P.S Greetings from Greece

Merry Christmas and a Happy New Year

[vonbeck]

 hi merry Christmas to you have you changed/tried the MAF (mass air flow Meter) these can go and would give you fueling problems, lumpy idle and shiity mpg  etc you could try one of a car that is running correct on yours if yiou can  

[antiliopoulos]

1 hour ago, vonbeck said:

 hi merry Christmas to you have you changed/tried the MAF (mass air flow Meter) these can go and would give you fueling problems, lumpy idle and shiity mpg  etc you could try one of a car that is running correct on yours if yiou can  

 

If am not mistaking the specific engine doesn't have a MAF sensor but a MAP sensor.  To be honest the idle is fine.

Would the above error that vcds reports be related to a map sensor issue?

[antiliopoulos]

On 27/12/2017 at 23:27, vonbeck said:

 hi merry Christmas to you have you changed/tried the MAF (mass air flow Meter) these can go and would give you fueling problems, lumpy idle and shiity mpg  etc you could try one of a car that is running correct on yours if yiou can  

 

After 2 years and the problem still continues....

In addition to all before mentioned actions, i had replaced once more the in tank fuel pump with an original one and the error from that moment on dissapeard. However the performance issues unfortunately did not dissapear with the pump. I also replaced the MAP sensor without any results. I had my injectors serviced(i have reached 174.000 miles) and cleaned. After the cleaning the car appeared to work correct again but only for the next 2-3 weeks. The performance issues appeared  again. I took the car to the guy that fixed the injectors and he said that the car is merely clogged and that i have to often run it to 4.000-5.500 rpm to keep it clean. I have tried that for almost a week and i don't think that is the problem. Last i have cleaned the engine with HHO and again once more the car worked fine for a couple of weeks and that's it. I strongly believe that some  sensor is malfunctioning but for unknown reason isn't recorded as an error on the car's ecu. After my last ride yesterday for about 350 miles i noticed that the car can't run more than 100 kpm on a hill with fourth gear engaged, and as for fuel consumption it can't get any worse....

I am completely frustrated by the mechanics here because the have a nasty habbit of accusing the problem being a result of bad fuel when they can't find the solution to the problem, which in my case isn't true.

Has anyone have an idea what to look for?

 

 

[EDS89]

Might be the oxygen 02 sensor or it might be the map sensor and clean it up or change the hole ****.  My mom 1,9 skoda tdi 2004 model had almost the same problem. Changed these parts and the power was back in shape after this.