Excessive smoke?

Hi everyone I know there are a few posts on this but just need to ask anyway.

Have lots of black smoke coming out of the TD4 (2005 facelift model), now I know it's usually the turbo that causes this but it wasn't doing this before I refurbed the injectors and replaced the the glow plugs.

Was hoping it was just a bit of gunk that was being burned off because the injectors were running better. But it seems to be getting worse and car is starting to feel like it's losing some power. Smoke doesn't smell oily or diesely more like when your cleaning out the open fire chimney in your house!

Might be a fuel/air mixture issue.

Try disconnecting the MAF and see what happens.

GrumpyGel said:

Might be a fuel/air mixture issue.

Try disconnecting the MAF and see what happens.

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Forgot that could affect it. Will give it a go later and see what happens.

I've got that at the moment. Been waiting for warmer weather to look at it. like you I did the injectors (although replaced) plus I also did the high pressure fuel pump. That cured the excessive grey smoke I was getting (and fuel in the sump) but when I put it back together I was getting these puffs of black smoke on acceleration. Not there when driving without acceleration.SO obviously excess fuel being dumped. I'm wondering if it is a hole in a boost hose I can't find. Someone correct me if I'm wrong but I think even a pin hole in one of the hoses can cause this excess fuel in the mix.

Black smoke usually ends up being a split or degraded intercooler hose or loose clip.

andyfreelandy said:

Black smoke usually ends up being a split or degraded intercooler hose or loose clip.

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In case it isn't that, what's the next most likely culprit?

MGT said:

In case it isn't that, what's the next most likely culprit?

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I would definitely look again at them

EGR stuck open ??

andyfreelandy said:

EGR stuck open ??

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Mines blanked off. I'm gonna look at the hoses and try unplugging the MAF as well. I wonder if I've knocked a hose or clip when doing the work?

Did you use new O rings and copper washers on injectors?

Have you got injector clamps on the right way up? Easy mistake and they lift if wrong.

andyfreelandy said:

EGR stuck open ??

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Thanks.

andyfreelandy said:

Did you use new O rings and copper washers on injectors?

Have you got injector clamps on the right way up? Easy mistake and they lift if wrong.

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Yeah replace them when installing and made double sure everything was in perfect before putting everything back together.

But just to make sure I'll have a look tomorrow to make double double sure

Checked hoses and all seem to be fine, no splits or holes. Disconnected the MAF and still seem to be a lot of smoke. Gonna leave it off today while I go out and see if it clears up any.

Here's the after-MAF (sorry had too )


Also see pic for the "soot" left on the ground!

Why did you refurb the injectors? Did you reset injector adaptations?

Akroni said:

Why did you refurb the injectors? Did you reset injector adaptations?

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2 of them weren't firing properly so took all of them apart and gave them a refurb. Don't know what you mean about adaptations.

So had a drive with the MAF unplugged and there's is about 90% less smoke, just a puff of black smoke under heavy load. So guessing the MAF is kaput!

Suppose it is possible that knackered injectors and a duff MAF may have been happy together and then making them injectors good upset things??

How is power, with and without MAF connected??

andyfreelandy said:

Suppose it is possible that knackered injectors and a duff MAF may have been happy together and then making them injectors good upset things??

How is power, with and without MAF connected??

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Yeah forgot to say, power feels better especially up hills, it was really struggling before.

andyfreelandy said:

Suppose it is possible that knackered injectors and a duff MAF may have been happy together and then making them injectors good upset things??

How is power, with and without MAF connected??

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Is that really a possibility?Genuine question, since I have not looked at the MAF since replacing injectors, and the black smoke is only since doing them.

some maf sensors fail and 'over fuel' .. evidently rare but does occur.
most fail and under fuel ..
.