Smokey after egr clean

Richard88

Hi.

My previous story : https://touch.boards.ie/thread/2056974917/1/#post85156468

My 1.9 diesel astra was sluggish and giving off a bit of smoke.

I got it serviced and used a bottle of fuel line cleaner and it passed the nct.

However this week it has gotten very smokey so I took the advice from my previous thread and cleaned the egr valve and the space where it connects to the engine, using carb cleaner and a cloth (the amount of sh1t in the egr valve was unreal)

Anyway I reconnected the egr valve and the started (perfectly with no smoke) even seems to be driving better.

The problem is now when I accelerate there is excessive, and I mean excessive black smoke.
It is happening when the revs are between 1500 and 3000 revs(kind of as the turbo is kicking in) it seems to happen regardless of if I press the pedal hard or soft.

If I floor it I can see a huge cloud behind me...

Anybody any suggestion or advice??
Also I should me to on iv started using dipetane also.

Thank you

bear1

Did you clean the MAP sensor? You also may have splits in the turbo hoses.
EGR's are just trouble in my opinion, many people just blank them off

jimgoose

Black smoke is excessive fuel. How's your air filter? It would be useful to have the OBD-II codes read.

sumo12

When cleaning EGR, you loosen soot & carbon etc. You cannot remove 100% of this from the valve and ports and some drops into intake. Also, you are increasing airflow into manifold by cleaning EGR, this will dislodge more carbon from intake and burn it off. Now you are seeing this being burnt off by the cat in the form of smoke. I wouldn't be too concerned about this in the short term, it should sort itself. If not, you have another issue, such as leaking turbo pipes, contaminated diesel, leaky injectors, dirty air filter as suggested above etc etc.

jimgoose

sumo12 wrote: »

When cleaning EGR, you loosen soot & carbon etc. You cannot remove 100% of this from the valve and ports and some drops into intake. Also, you are increasing airflow into manifold by cleaning EGR, this will dislodge more carbon from intake and burn it off. Now you are seeing this being burnt off by the cat in the form of smoke...

Good point. I suggest a couple of treatments of BG244K instead of dipetane - mighty stuff indeed.

bear1

As I said above, if your EGR was completely caked then your MAP will be the same and that sends a signal to the ECU.
Clear it out (be extremely careful with it as its very sensitive - I used carb cleaner and a cotton bud to remove the dirt)

Richard88

Cheers lads.
I'll try do that MAP sensor first, next option then is that fuel treatment and let it burn its self clear...
The air filter is good
It's been replaced about 1000 km ago!

If that fails it may be beyond my level of diy fixing!

Cheers

bear1

You should invest in a code reader. I have one and even though I paid about 100e for it, it paid itself off in less than a few months and I'm now in profit with it. Some garages charge 40e just for a diagnostics. Waste of money

Richard88

bear1 wrote: »

You should invest in a code reader. I have one and even though I paid about 100e for it, it paid itself off in less than a few months and I'm now in profit with it. Some garages charge 40e just for a diagnostics. Waste of money

And would that be useful even without the engine management light coming on?

bear1

Well im of the mind that if nothing pops up then I leave it alone
But yes they can be useful. The one I have shows me the MAF's operating "flow" not sure how to call. The actual engine temp if you stat is knackered. It can show you your actual RPM etc.
They are fairly useful machines. Plus I keep mine in the boot just in case something happens while I'm away from home. Saved me afew times when the car would go in Limp mode, cleared the faults and I could at least continue on my journey

Richard88

Well if spent the last while cleaning that sensor. And boy was it bad:



Next plan soo is that fuel line cleaner

bear1

Take her for a spin and floor the ****e out of her in the lower down gears just to clear as much out of the engine. If you still notice the smoke then go for the cleaner. Failing that, check the hoses for splits