2007 3.2 diesel blowing black smoke

[fvee91]

Hi All
My Triton blows black smoke from about 1/2 to full power at all speeds. Also the fuel economy is quite bad, 500km to a tank around town. I had the EGR valve replaced about 25000km ago after it brought the check engine light on and would limit power over 2200rpm. Heres what I have observed:
- Boost comes in at 14psi maximum above 2500rpm
- Fuel economy is getting worse as black smoke is getting worse.
- Engine starts and runs well, no abnormal noises, no overheating, good oil pressure.
- I feel the power is not what it was, I tow a car tralier from time to time. Ofcourse I could just be paranoid.
- Fuel filter regularly changed, air filter regularly cleaned and changed now and then
- The smoke seems to reduce after about 20mins of driving, but is always there at full power, even after a long trip.
- I have read this forum re the carbon problem and have noted that I have the updated inlet manifold
- 230,000km total common rail 3.2 diesel

Any suggestions would be greatly appreciated. I don't want to fork out for injectors etc if its another problem.

Thanks

Daniel

[Naff]

Heaps of threads on this topic, but possibly SCV. Updated manifold doesn't exclude you from carbon build up either unless you have an EGR blank or modification of some sort.

[biggibbo]

My money would be on carbon build up especially if the EGR was replaced. Is usually a good sign of buildup when they fail

[motoz]

Give the MAF sensor a clean and give the pins in the connector a tweak to ensure good contact.

[Cowboy Dave]

As above on the carbon - with those sort of kms on the clock if you haven't been running a blank or an EGR mod to date.

[fvee91]

I have just been reading through the threads on the SCV, if I am right would the check engine light come on if the SCV has failed? Also my motor does not surge at all, aparts from the black smoke under acceleration and poor fuel economy everything else is spot on.

How do I locate the MAF sensor?

I have holidays end of next week so I might try and pull the manifold off and give it a clean, can;t hurt!

[Cowboy Dave]

SCV won't produce a light. MAF sensor is on the top of your air intake near the air filter box. There is a PDF guide to cleaning the manifolds if you're tackling that.

[fvee91]

Seems you can get a SCV for $160 on ebay, I might just swap it regardless as plenty of people seem to be having trouble.
Can you provide a link to the PDF?

Cheers!

[Cowboy Dave]

As a matter of fact I can

http://www.newtriton.net/phpbb/viewtopic.php?f=40&t=13181

Usually you'll find such things linked to in the forum guide which appears at the top of most sections of the forum.

[fvee91]

Thanks, looks like Ill be having some fun over xmas!

[biggibbo]

Be careful if you swap the SCV. There are 2 different types, and will sometimes need coding to the vehicle at mitsibishi to make them run properly. I would start with MAF and then look for carbon.

Easiest check for carbon is to pull the hose off the throttle body and shine a torch inside and look past the butterfly valve. If it's caked up there it will Definitely be chockers in the manifolds

[fvee91]

So its a quite arvo here at work and I have done a bit of work on the triton:
- I have checked what I believe is the MAF sensor, it has 5 wires going into it on a black plug right were the air hose joins the air box? It was very clean, a small amount of dust only. I wiped it off and reinstalled it.
- I remove the air hose were it meets the intake manifold, as suggested I looked past the butterfly and could only see shiny metal with a thin film of oil on it.
- I pulled the SCV valve and pulled it apart, there was some scoring on the piston as per the repair thread. Gave it a polish in the lathe and put it all back together.

When restarting I let her warm up and revved it out to about 3500rpm with full power. It did blow some black smoke when I did this, but this could be just due to the turbo not spooling up enough in the short time it took for the motor to rev up.
As always the motor started, ran and revved fine.

I suppose all I can do now is see if the smoke and fuel economy improves.

Thanks

Daniel

[L200Shogun]

From FB at 114k km. I have seem pictures of much worse with a lot less km.





Another at 160k km

[L200Shogun]

mass-air-flow-cleaning-maf-sensor

I’d been having problems with oil leaking from the turbo in my PB Challenger and had also noticed a significant decrease in fuel economy. This was coupled with an increase in black smoke blowing from my exhaust under moderate to light loads. In a previous post, you can read all about my turbo replacement, but I’d also been told that cleaning the MAF sensor might also make some difference in regards to fuel economy and black smoke.

[Cowboy Dave]

If you could wipe it off then you weren't cleaning the MAF sensor. You were maybe cleaning the air temp sensor which is in the same unit. Best to buy a can of MAF sensor cleaning spray and read the post a the link in the post above - or we have a thread here with the same info. I think there's even a video somewhere. Basically you spray into the guts of the same unit you've just removed and wait for it to dry.

Also add some dielectric grease to the mating surfaces of the plug on the same unit.

The throttle body comes off pretty easily if you want to poke around a bit further looking for carbon. You will have plenty with that sort of mileage, unless it has been cleaned at some point.

[fvee91]

Will revisit the MAF sensor!

[mattz]

Will revisit the MAF sensor!

It's imperative you use the correct stuff to clean it with......anything else can cause damage to it.
I had similar issues to what you are describing and the scv fixed it......so you're on the right track.
Unfortunately there are many things that can cause the symptoms you're describing on the triton.
Everything that's been suggested could fix it. If they don't you'll most likely be looking at bigger dollars and injector replacement.

[fvee91]

On the way home I felt the engine was a lot more responsive and there was less smoke, and the smoke was almost gone after a few minutes of driving. I'll get some spray to clean the maf and also some stuff to spray in the manifold to help clean out the carbon.

Fingers crossed this will have it fixed.

[fvee91]

I felt the engine was a lot more responsive and there was less smoke, and the smoke was almost gone after a few minutes of driving. I'll get some spray to clean the maf and also some stuff to spray in the manifold to help clean out the carbon.

Fingers crossed this will have it fixed.