AlexPrinz

Mercedes Vito 2005: Jerking, diminishing engine power and high fuel consumption

Hey guys, I have a few problems with my Benz, a 2005 Mercedes Vito with gasoline engine and 119138 km mileage. The indicator light is on, engine power is dropping, jerking when accelerating and to top it all off a strange engine noise! On top of that, the fuel consumption is miserable. I suspect it could be knocking combustion on at least one cylinder. Have you ever had similar problems? What was your experience at the mechanic? I didn't have a good one last time. Would appreciate your feedback. Thanks in advance!

(Translated from German)

15 comment(s)

Quotation:
@Lukasz wrote on
I rather doubt that it is a mechanical cause such as timing because, for example, after coding the injectors everything is fine for a while and then comes back after some time as if something is constantly changing the fuel mixture to the fact that before the engine warms up it runs evenly and quietly.

And another question like this, is the knock combustion sensor responsible for anything or does it just give a signal that knock combustion is recognized?

(Translated from Polish)

Quotation:
@Lukasz wrote on
I rather doubt that it is a mechanical cause such as timing because, for example, after coding the injectors everything is fine for a while and then comes back after some time as if something is constantly changing the fuel mixture to the fact that before the engine warms up it runs evenly and quietly.

The knock sensor's job is to detect the vibrations caused by the engine knock or 'pinging' and send a signal to the engine control unit (ECU). The ECU then retards the ignition timing to prevent knocking. If the knock sensor is faulty, it could cause improper fuel mixture and timing, leading to the issues you're experiencing. It's worth having this sensor checked or replaced. Please keep us updated on your progress. Do you have any other questions?

Quotation:
@CarlyMechanic wrote on
The knock sensor's job is to detect the vibrations caused by the engine knock or 'pinging' and send a signal to the engine control unit (ECU). The ECU then retards the ignition timing to prevent knocking. If the knock sensor is faulty, it could cause improper fuel mixture and timing, leading to the issues you're experiencing. It's worth having this sensor checked or replaced. Please keep us updated on your progress. Do you have any other questions?

Thank you very much for. Advice I will still try to replace this sensor it does not cost terribly much and maybe it will solve my problem

(Translated from Polish)

Quotation:
@CarlyMechanic wrote on
The knock sensor's job is to detect the vibrations caused by the engine knock or 'pinging' and send a signal to the engine control unit (ECU). The ECU then retards the ignition timing to prevent knocking. If the knock sensor is faulty, it could cause improper fuel mixture and timing, leading to the issues you're experiencing. It's worth having this sensor checked or replaced. Please keep us updated on your progress. Do you have any other questions?

Hello again and is it possible to verify if the injectors match the engine controller? Maybe someone just replaced it with the wrong one before? The controller number is A611 153 49 79 and the injector number is A646 070 01 87

(Translated from Polish)

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