I would have to say no, but i have never tried them in the bath with heavy deposits as they are usually removed first, and remember i am only doing the end of the injector to make sure the spray pattern is even ie as five spurts.
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Completely dismantle of the injector is very time consuming and must be done is a clean environment, or clean area, i use stainless steel dog dishes to keep all the parts in when doing a complete breakdown of an injector.
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There's a very small ball bearing which is no bigger than that of a ball bearing in the end of a bic biro.
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It resides in the little recess in the injector below, lose that and the game is over.
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You can clean or even add new injectors to your car, but always remember the port must be clean also as below.
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