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Our Bluetec started to smoke black upon brisk acceleration. We've had all the deletes done a couple years ago, this smoke thing is recent.
I asked in the W166 forum and one possibility offered was leaking injectors. Are there any other ideas and if the injectors are indeed the culprit, are there any drawbacks to not having them replaced?
I would also start with injectors if you have black smoke. You can burn the pistons if the injectors are leaking. You can do injector leak test to find out which injector is bad and replace just bad one. Try to purchase BG245 sometimes it can help, but you don't want to ignore this for too long.
I would start with the simplest things, first.
Check the intercooler hoses closely for splits, tears, or leaking/loose connection. A leak smaller than you can hear, can be big enough to throw the air/fuel mix.
It can smoke before an error is thrown, and a tune file will be more tolerant of over-fueling than a stock file.
If the hose from turbo to intercooler ( hot side ) does a dip before coming up to the level of the intercooler inlet, hot oil will collect there, weakening the hose.
Look to see if these hoses are greasy on the outside. If so, degrease, run the car, and check again for source of the oil...
Looking at xentry, you need to pressurise the turbo inlet with 300mbar of air slowly and listen for leaks. I wonder if anyone made an adapter equivalent to 642 589 01 91 00?
Before you go to the dealer pop the hood and take an old t-shirt or clean rag - wrap it around your hand, and wipe the backside/underside of the driver's side boost hose.
Comes from the front-left/driver's side of the motor, to behind the radiator, and is just below the the upper radiator hose.
One end or the other is likely gonna be a little greasy from the connectors weeping.
But if hose is wet or dripping or you can see nearby areas getting coated with oil, you may be able to feel a split in the hose.
Even if you have the dealer do the repair, you'll know what to expect from them.
If you still have the crankcase vent hooked up to the air inlet and feeding the intake with oil, there's no need for special tools to find a leak.
The oil will show it to you.
(That test is only useful in really marginal conditions, but it's a good way to justify more hours in a shop)
Got around to checking that hose B34chBum completely dry. But thanks for the suggestion.
I guess I'll be bringing it to an MB dealer unless someone around Montreal can recommend a good indie.
10-11-2020, 01:29 PM
