I got my car after timing belt replacement @ pinnacle fiat yesterday. I have got a few queries. Along with the timing belt replacement they also had to change the ac wiring harness (for which the dashboard was opened) as the blower wasn't working properly. Now after all this work I find that the engine sound has increased inside. On the outside its normal but on the inside engine is pretty audible. It sounds a bit rough( kind of sound you get if the air filter is removed). My spark plugs haven't been changed yet( 6 years 43000kms) & I have bought spare ones to get it changed outside. They said the ignition coil plug is a bit broken so better get it done outside. The car used to sound normal 3 days back when I gave it for the work. What could be the reason for this increased sound? Is it the spark plugs/ timing belt/ dashboard opening? Although they scratched the dashboard here and there, there are no rattles at all. I doubt whether they forgot to put back some damping materials inside the dashboard. Ah this increased sound doesn't make me feel good when driving.. Normal service done a month back & she used to be very smooth. :| Will be changing the spark plugs soon. Should I be worried??