A hand-held laser device includes a casing formed with a substantially hollow interior space and having a laser emitter thereinside. The distal flap of the catheter main tube comprises a plurality of reliefs arranged on planes transversal to the tube axis; a tapered portion coaxially connected to the distal flap comprising a plurality of notches complementary to said reliefs. A combustion sensor is in operative communication with the vehicle for the purpose of analyzing a vehicle combustion performance parameter. At least one actuating element is arranged laterally on the sliding piston.