BMW Repair Questions? Ask a Mechanic for Answers ASAP
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Yes, techron helps against dirt on the injectors.
But I think that the problem could be somewhere else.Mostly too little air is the cause that fuel burns badly and soot accumulates.
Make sure you check the air filter and the intake manifold. Especially with this model it happens quite often that oil carbon settles in the intake manifold and thus reduces the cross-section of the pipes.
This means that less air can be sucked in and the combustion process produces heavy soot. If the intake manifold is clogged, however, only a new manifold will help.
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Either remove the throttle valve and go into the intake manifold with an endoscope camera, or remove the manifold completely and take a look.
This could be a knocking burn, cause could be here:
- Injectors clogged-poor fuel quality- not enough air in the combustion chamber-control chain lengthened
You can start with the chevron, but if it doesn't improve in a short time, the other things have to be checked.
It is possible, but experience shows that too little air is more often the cause.