Anyone know anything about Diesel engines?

[baldy]

I'm after some help with a recent purchase the wife made. She bought a Mercedes ml270 2.7 CDC with 110k on it.

Everything was fine for a few weeks but has now developed an annoying problem which seems to be getting worse. It starts fine and revs up perfect while stood but when moving if you go past 1/3 throttle it throws out lots of whitish grey smoke. It seems to surge under load which is accompanied by a rattling from the engine. It has lost a bit of power as well. It only does this while driving so I am ruling out major engine problems.

There are no error codes logged on the ECU.

Any thoughts appreciated.
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One day i will rule the world, just not today.

[arry]

Not the classic oil leak down the manifold from turbo, knackering the swirl actuator is it?

Really common on the 3 litre they stuck in the Jeep.

[Tankie]

Check all the fluid levels, could be burning oil via the turbo
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[WD Forte]

leaky injector?
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bikers smell of wee

[baldy]

It doesn't seem to be using oil at all. Normally leaky turbos make them smoke all the time don't they? Ive checked for boost leaks as well. All seems good.

I hate modern diesels.
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One day i will rule the world, just not today.

[Tankie]

[baldy]

[Tankie]

[arry]

[baldy]

Would I get a boost leak first?
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One day i will rule the world, just not today.

[arry]

No. It just weeps oil - the weeping isn't so much the issue, it's the swirl motor that gets coated and goes tits up as a result that is.

https://www.justanswer.com/jeep/6nyqa-jeep-grand-cherokee-limited-hi-08-grand-cherokee.html

I'm in the know on this as a friend of mine had a Cherokee that was a real problem child, with the 3.0 litre CRD engine. Ended up with a quote from Jeep for £4000 to change the turbo and manifold assembly - so we used a resistor pack to fool the swirl motor and he got shot of it whilst the going was good.

As I say, not sure if the 2.7 lump is any different, or any better.

[baldy]

I know of the issues with the swirl flap motor but everything seems fine. There's no weeping from under the manifold. I'm eventually going to do the egr and swirl delete. Generally faults with the motor would show a fault code.
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One day i will rule the world, just not today.

[arry]

[baldy]

I leaning towards a faulty injector. I need to do a leak off test but some bugger has nicked my test kit. I've never had symptoms like this though from injector failure.
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One day i will rule the world, just not today.

[nowhere.elysium]

DPF cycle going nuts?
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'10 SV650SF, '83 GS650GT (it lives!), Questionable DIY dash project, 3D Printer project, Lasercutter project

[baldy]

Doesn't have a dpf
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One day i will rule the world, just not today.

[nowhere.elysium]

[baldy]

I've googled the hell out of this and can't find anyone with the same symptoms. Nothing seems to be broken yet it won't work properly.
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One day i will rule the world, just not today.

[P.]

Do swirl and EGR delete.

If problems rectify, then hey presto.

If not, check both injector and possibly the seals, unsure if related but the 2.4 and 2.5 engines had seals that went shit and you heard a decent amount of rattling.

Failing that, removes the wheels and leave it on its side on the path.

[baldy]

It only rattles under hard acceleration over 2.5k. Injector seals are good.
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One day i will rule the world, just not today.

[chrisst2]

Have you checked the turbo inter-cooler hoses?
Sounds to me like one of the hoses has a leak/split or is collapsing , white smoke and drop in power is classic sign of that sometimes accompanied by a rattle.
If not then check the injectors are actually seated and tight, although I believe if it was an injector problem you would have black/blue smoke.

[Motorhate]

Possible injection timing. The white smoke is too much fuel being delivered that isn't getting burned up.

If not then maybe a crack in your exhaust manifold.
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[Hong Kong Phooey]

Sounds like oil leak past turbo seals, pull intercooler hose and check for oil and check for play in chra. Should be none up/down, tiny bit in out isn't terminal.

Other worthwhile free checks to do are check condition of vac hoses and breather systems and one way valves.
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[chrisst2]

still think you should check hoses 1st, white smoke is rarely anything to do with oil leaks or injectors, usually un-burnt fuel , hoses are a classic sign of that, takes a few minutes to take the hoses off and check.

[Northern Monkey]

I'd be checking the rubber hoses from the turbo to the I tercooler the. Intercooler to I let manifold.

I've had cars where the maf sensor is after the turbo, so thinks loads of air is going to the engine. Loads leaks out perished hoses so the engine overfuels. Happens most when the boost is high.
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