Help !! My Ml is kangarooing

[Bigdave1984]

Hi I need some advice on my ml320. It’s kangarooing when cold .so I full throttle it and it kangaroos so I back of the throttle then the car is perfect fine with more power etc and iv had my back pressure censer changes but the fault is still there.

 

[kianok]

Hi I need some advice on my ml320. It’s kangarooing when cold .so I full throttle it and it kangaroos so I back of the throttle then the car is perfect fine with more power etc and iv had my back pressure censer changes but the fault is still there.

Need to get the fault codes read on star otherwise you could end up chucking money at it.

Find a good local independent who charges a reasonable rate for a diagnostic session.

 

[grober]

You don't say the exact age/model of ML you have, but if you have an electronic throttle the throttle body may have a sticky throttle butterfly- if its this --- a good clean should see things right. If the throttle body position potentiometer is damaged than that's a bit more expensive!

 

[Bigdave1984]

Sorry it’s a 2006 320 with a brabus ecu. The mechanic has done a full diagnostics on the car only thing he can find is that there is too much air on the inlet manifold could this be the cause of the jerking on hard acceleration ? The turbo has been check and it’s all ok

 

[Bigdave1984]

Sorry it’s a 2006 320 with a brabus ecu. The mechanic has done a full diagnostics on the car only thing he can find is that there is too much air on the inlet manifold could this be the cause of the jerking on hard acceleration ? The turbo has been check and it’s all ok

 

[grober]

Too much air in the inlet manifold would point to an inlet manifold leak somewhere - [important bit] that's unmetered air- air the cars ECU doesn't know about via the MAF to achieve the correct air fueling ratio. This would be more marked when cold when the engine requires more a higher fuel to air ratio.
How does the intake manifold affect your engine?

 

[grober]

The OM642 diesel v6 has a rather elaborate Y shaped inlet manifold [ with 2 maf sensors] that leads to the single centrally mounted turbo. They are known to give problems so might be worth a look?

 

[Bigdave1984]

The OM642 diesel v6 has a rather elaborate Y shaped inlet manifold [ with 2 maf sensors] that leads to the single centrally mounted turbo. They are known to give problems so might be worth a look?

That’s a new one. I’ll pass it on to the garage But has it been known to sudder on full throttle?

 

[Bigdave1984]

Also with the airflow mass meter would that come up on a diagnostics machine ?

 

[Bigdave1984]

Need to get the fault codes read on star otherwise you could end up chucking money at it.

Find a good local independent who charges a reasonable rate for a diagnostic session.

Iv had that. The only thing that come up wus the air ratio was above the normal rate ?

 

[grober]

Also with the airflow mass meter would that come up on a diagnostics machine ?

Not necessarily if the leak was downstream of the airflow mass meter/s Its possibly a problem that might only be revealed by realtime driving data on MB Star. I am suggesting this merely as a follow up on the too much air in inlet manifold warning assuming this is accurate? What does your indi suggest is the problem?

 

[Bigdave1984]

He’s not 100% sure we had it hooked up to a computer for over a hour doing all sorts of tests. Ie back pressure tests turbo test dpf and the only think it come back with is high on air intake. I think the numbers are between 250-340 but mine was 460 ish I think so he said it’s probably the inlet ...... should the brabus d3 chip have anything to do with it ?

 

[Bigdave1984]

Sorry I mean d6 chip

 

[rf065]

If you have a Brabus chip, surely you could disconnect it & test the car in standard form?

 

[grober]

This thread might help a bit if you decide to get rid of the b6 temporarily for testing. Its possible it has a fault or its wiring has but its just as likely to be something else like an inlet leak.
brabus d6 chip help??

 

[Bigdave1984]

Ill mention it to the garage perhaps take it off and run it through the computer and see what the air flow reading are ? Has anyone else had problems with the d6 chip ? Perhaps it might need remapping to sort the issue out ?