I bought spark in dec 2009, after 7 months I installed lpg kit from outsite.... everything is good after that almost 1 year... from last few month a strange sound "D UM..D UM ...D UM...." D UM ..DU M ... DUM...." DU M..DU M ...DUM...." D UM ..D UM . ..D UM. ..." comes from bon et. I took to dealer place but he not able to identity the cause....He said problem with LPG kit and KIT dealer said problem with engine.
any suggetion.