I have a 2002 model Ford Ikon 1.8 Diesel car which had a problem & was stalling if the AC is switched on. The Ford service center identified the problem with the fuel pump. The pump was overhauled, repaired & serviced by the Ford dealer as they said that many parts within the pump had to be replaced. But after the pump was serviced the engine noise has been very high. There is no drop in mileage[15 Kmpl]& no power drop is noticed. The Ford service engineer said that it is normal sound & refuses to identify it as a problem. The engine is a lot more noisy than a Sumo/Mahindra Geep. Previously it was very smooth compared to these vehicles. My neighbors in the street have also told me that my car is very noisy. What could be the problem as the Ford Service center gave me a computer generated report that all parameters of the engine are perfect?