Some months ago I did a consultancy assignment for Tata Motors and found that many of their DICOR engines (including the Quadrajet engine used in Indica Vista – this engine is identical to the Maruti Multijet engine) are facing the same problem.
According to Maruti Suzuki, the problem is caused by water getting into the minute gap between the injector body and the cavity in the cylinder head which houses the injector. This usually happens during pressure washing of the engine compartment during servicing. Once water / moisture gets into the small gap, it causes rusting and that jams up the injector over a period of time.
Maruti Suzuki have come up with a simple solution – cover the top part of the engine during pressure washing. A picture of the cover placed over the engine in my car can be seen below.
I would advise all diesel Swift owners to:
1) Ensure that the engine cover is used during pressure washing. During the servicing of my car today, the MASS started washing the engine compartment without the cover. The cover was put when I reminded them.
2) Take care while washing the engine compartment at home. Don't direct water spray towards the top of the engine or below the black plastic engine cover.