Hi,any help appreciated.My Scudo smokes heavily when going through gears and has started misfiring when accelerating.Its heavy on fuel also.Garage have replaced egr valve(fault code)but it made no difference.They say they're going to take injectors out(they are pretty recent mind)and take it from there.Also talk about pump.All talk and no solution is getting me down,especially when night driving and fellow motorists are backing off because of the amount of black smoke.

Black smoke means not enough air is getting through.

You need to check the whole intake system including turbo, inter-cooler and air flow sensors. It's also worth checking the inlet manifold is not clogged with soot.

courier

Sounds like you have too much fuel for the air ..

This stops it burning cleanly.

Does it have a DPF?

NO ENGINE LIGHTS..??

Charlie

Faffing with the injectors is a waste of money. Your mechanic should know that black smoke = not enough air.

Poor injectors give pale or even white smoke but on common rail systems, the electronics will see the pressure drop and raise an error code.

Gentle use can clog the inlet manifold with soot or even clog the turbo vanes/waste-gate. It needs a thorough check and clean of the whole intake system. If it has a DPF, that needs checking too as it will have been overworked.

Thanks all.Garage talking about turbo not working properly and it has been suggested that system(as mentioned) needs a good clean out.Sounds like a bit of everything mentioned culminating in poor performance.

courier said:

Thanks all.Garage talking about turbo not working properly and it has been suggested that system(as mentioned) needs a good clean out.Sounds like a bit of everything mentioned culminating in poor performance.

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I cannot see how a poor turbo is generating so much smoke. (Barring pumping in ENGINE OIL.. but youve not mentioned fluid levels dropping..)


I would try a 2nd garage before shelling out that kind of money.

Idea.. intercooler full of fluid..

Discoñnect the feed hose.. see if the smoke clears.. I had that..

Where are you based?

The turbo sucks air via the air filter. Check filter and all inlet pipes.

The turbo compresses the air and blows in via the intercooler into the engine inlet manifold. Check all that lot for dirt, oil, leaks. etc.

The Exhaust Recirculation Valve takes a percentage of exhaust gas and feeds into the inlet manifold. This recycles some soot to burn it a second time in the engine. At low engine power this will be flowing at full bore with less recirculation as engine power increases. When the engine is used mostly at low power, sooty particles can settle into the inlet manifold blocking the airflow. This can cause black smoke just as easily as a blown turbo or clogged air filter.

Some diesel engines have a throttle valve in the inlet manifold to shut the airflow when engine stops. This stops the engine self destructing if there is a fuel leak or an oil problem. Has your's got one? Is it clogged in some way?


https://www.linkedin.com/pulse/diesel-engine-smoke-color-what-means-matthew-bailey

Black smoke = inadequate air - blocked air filter non-functioning turbo or burst air pipes. Smells sooty.


Blue smoke = lubricating oil. Could be engine problems or turbo oil seals. Smells of burnt oil.


White smoke = weak fuel injection allowing unburnt fuel into the exhaust. Smells of cheap paraffin stove or jet exhaust if you like globe trotting

courier said:

Thanks all.Garage talking about turbo not working properly and it has been suggested that system(as mentioned) needs a good clean out.Sounds like a bit of everything mentioned culminating in poor performance.

Click to expand...

Where are we with this?