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  #9  
Old 11-03-2018
JeanLuke  JeanLuke is offline
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Thanks for the comprehensive reply. To clarify:
  • Just under 240,000km. It had just over 220,000km when I bought it last May
  • I run the Torque Pro app as a boost gauge. I see 0.5bar at mild throttle (normal slow trafic take-off) peaking up to 1.5 bar if I mash it. I think the turbo is healthy.
  • Given the above and that the pressure is measured at the manifold (after the intercooler) I doubt it is clogged with oil.
  • A straight-edge reveals all injectors are at the same height.
  • No black death. In fact, the injectors look very clean. I suspect they are not original, but I do not have any history.
  • EGR has recently been disabled. I have manually applied and removed vacuum to it to ensure it is closed. I'm pretty sure it is. It idles really rough when I manually put vacuum on the EGR and smooth when removed.
  • The engine does not use oil and is not fume out the oil filler or dipstick.

The smoke is not bad, but visible in the mirrors. I'm working on the assumption that if you can see your own smoke there is a fair bit of it. It is black - not white or blue.

I'll do a leak test, but it will be a few weeks before I can get the time.
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Old 11-03-2018
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Sounds like it is running reasonably for the KLMS on it -the other thing that has been known to happen is the Catalytic convertor downstream from the turbo can partially block and give the engine an asthma attack - hard to get full noise due to excess back pressure . One of the WG's I had was fitted with a 3"mandrel bent sports system straight off the turbo with no Cat - went hard .Fortunately the WJ/J's are not fitted with DPF -diesel particle filter which also robs power as engine ages . I've never seen black smoke in the mirror on any of my 3 x 2.7's ,so if you are fairly convinced everything else is OK ,the injectors are giving engine full fuel but turbo speed -air being forced into engine MAY be affected by Catalytic convertor . Most newer engines cannot give full fuel underload until required boost is reached to stop the black smoke but I do not know if the 2.7's ECU is that smart as it's early common rail technology -let me know how you go with the leak test.
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Old 11-03-2018
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A clogged inlet manifold could richen up the mixture and generate a bit more black smoke. A can or two of inlet manifold cleaner probably wouldn't go astray.

A leaking injector could also add to the black smoke problem.

Oddly enough an EGR delete will kill the black smoke, it is worthwhile doing.
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Old 12-03-2018
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Forgot to mention - clean the MAF sensor - use MAF cleaner available in spray can from most large auto stores -do not use brake cleaner ect as it can affect the plastic on the unit -easy job compared with most on the 2.7 -couple of hose clamps on the air induction -should be done as part of a major service along with the camshaft positioner sensor if you want peak performance !
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Old 12-03-2018
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Funny thing... I just purchased a can of Wurth cleaner. EGR delete done.
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Old 13-03-2018
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Quote:
Originally Posted by almc3 View Post
Forgot to mention - clean the MAF sensor - use MAF cleaner available in spray can from most large auto stores -do not use brake cleaner ect as it can affect the plastic on the unit -easy job compared with most on the 2.7 -couple of hose clamps on the air induction -should be done as part of a major service along with the camshaft positioner sensor if you want peak performance !
If you don't have a catch can installed on the PCV you will find the MAF is very oily. Cleaning the MAF is definitely a good thing to be doing.

Jason
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Old 14-03-2018
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Quote:
Originally Posted by bodgie View Post
If you don't have a catch can installed on the PCV you will find the MAF is very oily. Cleaning the MAF is definitely a good thing to be doing.

Jason
I don't have a catch can. I had heard it said on older engines you were better off to let the oil through but kill the EGR to stop it turning to sludge.

As for the MAF, it sits on top of the air box, a long way before the PCV connection and higher too. Are you sure the oils gets to it? Do you mean the MAP, which is on the manifold?
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Old 14-03-2018
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Quote:
Originally Posted by JeanLuke View Post
I don't have a catch can. I had heard it said on older engines you were better off to let the oil through but kill the EGR to stop it turning to sludge.
I think it is a good idea ether way to have a catch can, can help stop other pcv oil vapour related issues. The EGR delete is mandatory IMHO though.


Quote:
Originally Posted by JeanLuke View Post
As for the MAF, it sits on top of the air box, a long way before the PCV connection and higher too. Are you sure the oils gets to it? Do you mean the MAP, which is on the manifold?
If you have a hot engine and lift the top of the air box you'll see a heap of vapour come back up the inlet tube to the turbo. This is how the MAF gets oily, it isn't from normal driving, just parking when hot.
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