Hi guys!
I don't ask help very often but this car give me difficult time.![headbang]( "headbang")
I can't remember exactly the engine code Cxxx.
She has 97000 km, and I can't see any sign of previous work.
The car came to me from other mechanic for diagnostic and second opinion.
So just read carefully:
The fault was: implausible signal from turbo vacuum actuator sensor (G251?), and "low boosting" fault.
I have changed this before few times, and I know how have to setting up.
But this actuator has diaphragm fault more often than sensor.
During the job I checked everything: Vacuum, vacuum-solenoid (N75), turbo-vain mechanism, DPF-sensor, live-data.
And the ECU has the last S/W update.
After the job went to test drive. The car had shit power. Then has power again, and no power.
Then I checked the DPF pressure, and at warm engine and at idle I saw 51 mbar.
I said: WTF??? Switched off, and when the engine is not run the pressure is 0 mbar.
Started again and the pressure went to 21 mbar.![devil]( "devil")
I fitted new DPF sensor for test, same result.
But no any fault about DPF at all!
The other strange thing is, when the car has no power at 1st gear and I keep press full throttle, after 22000 rev the engine start pinking!!!
So I have idea, but I'm not sure.
When I look the DPF, one steel hose come out at bottom (after DPF), one come almost at 1/3 of length DPF. (Before DPF).
What is inside the top 1/3 of DPF? Catalytic converter?
I never opened this type of DPF, but if the catalyst is broken, it give big back pressure of engine as it cannot exhausting, and this happen before DPF part, of course no DPF fault in the system.
Any one had similar issue before?
I don't ask help very often but this car give me difficult time.
I can't remember exactly the engine code Cxxx.
She has 97000 km, and I can't see any sign of previous work.
The car came to me from other mechanic for diagnostic and second opinion.
So just read carefully:
The fault was: implausible signal from turbo vacuum actuator sensor (G251?), and "low boosting" fault.
I have changed this before few times, and I know how have to setting up.
But this actuator has diaphragm fault more often than sensor.
During the job I checked everything: Vacuum, vacuum-solenoid (N75), turbo-vain mechanism, DPF-sensor, live-data.
And the ECU has the last S/W update.
After the job went to test drive. The car had shit power. Then has power again, and no power.
Then I checked the DPF pressure, and at warm engine and at idle I saw 51 mbar.
I said: WTF??? Switched off, and when the engine is not run the pressure is 0 mbar.
Started again and the pressure went to 21 mbar.
I fitted new DPF sensor for test, same result.
But no any fault about DPF at all!
The other strange thing is, when the car has no power at 1st gear and I keep press full throttle, after 22000 rev the engine start pinking!!!
So I have idea, but I'm not sure.
When I look the DPF, one steel hose come out at bottom (after DPF), one come almost at 1/3 of length DPF. (Before DPF).
What is inside the top 1/3 of DPF? Catalytic converter?
I never opened this type of DPF, but if the catalyst is broken, it give big back pressure of engine as it cannot exhausting, and this happen before DPF part, of course no DPF fault in the system.
Any one had similar issue before?