New owner confused

[Darlington Mlambo]

Hie there
ML 270 CDI 2002 year, RPM on n/p is ok, but on the "D" car drives up to 40 MPH and 3000 RPM not even one mile further. Please help stack in Scotland need to go back to Liverpool thank you in advance..

 

[McDonald]

I don't know your model, but I was similarly confused when I first got my car.

Is there a small control arm behind the steering wheel and the indicator arm? If so, it's a limiter. If nudged it will limit your speed to the current speed (very useful on motorways if set at 70mph). There'll be a light at the end of the stem, if it's active. If you're able to move that control arm in the correct direction, the light will go off and normal service will be resumed.

Best of luck with your journey.

 

[Darlington Mlambo]

I have tried that but nothing the light for cruise control is not on

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[John Laidlaw]

Speed limiter and cruise are different but controlled from the same stalk, you press the end of the talk for speed limit activation/deactivation
Have you tried kickdown?

 

[Chrishazle]

When my S203 C270Cdi would not rev above 3K, kickdown also did not operate - it was a failed MAF.

 

[EmilysDad]

.... you press the end of the talk for speed limit activation/deactivation
....

at which point the light on the stalk will come on .... OP says the lights isn't on

Good point re kick down. If it's due to the limiter, it should de-activate when you boot it.

 

[John Laidlaw]

at which point the light on the stalk will come on .... OP says the lights isn't on

Good point re kick down. If it's due to the limiter, it should de-activate when you boot it.

Fair point, forgot that!

 

[Darlington Mlambo]

I have tried kick down nothing at all.. If I unplug the MAF does it make a difference.. Now when I rev it whilst it's in park it goes only up to 3rpm above 3revs it's as if you revving a car with an air lock or running out of diesel...

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[LostKiwi]

Now when I rev it whilst it's in park it goes only up to 3rpm above 3revs it's as if you revving a car with an air lock or running out of diesel...

That's by design. It's to prevent damage to the engine and transmission when in neutral.

 

[LostKiwi]

I have tried kick down nothing at all.. If I unplug the MAF does it make a difference.

It sounds like your car is in limp mode so should have an engine management light on or a warning to that effect.
It should also have a code present in the engine ECU. Have the code read (preferably on an MB specific reader) and it will probably give a pointer to where the issue lies.
Does your gearbox change gear normally or is it stuck in one gear?

 

[Darlington Mlambo]

No lights at all on dash. I have driven it for about 20miles when you stop and drive off it picks up speed OK but when you get to 40 MPH and 3000 RPM it just stops going so I suppose its selecting gears OK

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[V6Matty]

Couple of possibilities are turbo actuator or O2 sensors on the intake, both of these put my old OM647 into limp mode without EML on the dash.
You really need the codes read thoug to see where the issue really is

 

[Darlington Mlambo]

Will it develop any bigger problems if I drive it from Scotland to Liverpool on the 40miles an hour

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[Wighty]

Will it develop any bigger problems if I drive it from Scotland to Liverpool on the 40miles an hour

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I don't know , but doing that speed of a motorway is a bit of a Danger

 

[umblecumbuz]

If the engine's in Limp mode, then 40mph max sounds suspect. Even in limp, when in Drive you should be able to cruise at motorway speeds without hassle if, as you say, you can reach 3000rpm.

Something doesn't add up here. I have a feeling that either the box is not really hitting Drive, but is stuck in a lower gear, or the rev limiter - which doubles as a speed limiter, set on the lh short stalk - is not freeing itself correctly. If disconnecting the Maf makes no difference, then those two are the most likely possibilities.

 

[L John]

Do you have recovery on a breakdown policy?
If so, just ring them to come out and if it can't be sorted they should take you home with the car on a flat bed.

If you don't have cover, either.
Get it to a reputable garage ASAP so you can drive it home properly.
Pay for recovery.
Risk driving it and getting stuck miles from anywhere with a further damaged car and still pay for recovery.

If you do drive it, do it at a time with quieter roads and don't even think about taking it on the motorway.
Driving it would be the least sensible option. For a 20 mile drive I'd possibly do it but not the distance you're talking about, no way.

 

[John Laidlaw]

Being someone who drives regularly between ‘Liverpool’ and Scotland there is no practical way to avoid motorways unless you have the desire to drive 10 hours solid!
Reality check, either needs recovered back down here or you need to get it to a specialist up there to get checked, as L John there’s no way i’d Drive the 240 miles plus in that state (and that’s if you’re in central Scotland too)

 

[Darlington Mlambo]

It is a long way to go.. Managed to get some tools opened the top cover it's licking diesel from injector could it do the same thing because of that sorry to be a bother

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[John Laidlaw]

A leaking injector seal will certainly do it!
You could certainly try tightening it but no gurantee the seat isn’t damaged. Sorry not much help as it needs properly looked at in a workshop

 

[umblecumbuz]

Leaking injectors are a known weakness of the 270 engine. If caught early it's not a difficult fix - but you need to find a garage that knows the engine. If that is the cause of your problem I'm surprised that rough running was not mentioned in your original post. Even with five cylinders it should be missing a beat.

Possibly, due to the fulcrum design of the injector hold-down clamp, a careful tightening will fix the leak (they are known for requiring a 'nip' after bedding down), but brutal over-tightening will bring stripped threads and further trouble.