Brother thanks for ur respond, actually very first time when i bought this car so i changed the tensioner, but still there was a some grinding and rattling sound, and sudden after few days this sound becomes too hight, again i went to the same mechanic and i changed 4 tensioner, but the rattle, vibrate sound remain same, then again i went to other mechanic and i had to buy china tensioner, but after 2 months sudden the tensioner l key bolt broken on the way and i was not able to drive a few, again yesterday i bought 2 tensioner and it was very good in condition but still vabration sound remains same, inshAllah tomorrow i will go to azim autos bufferzone, let c what he will diagnose. Actually when i shift my gear on drive or reverse t sounds apper like water pump sound, and 10-20 rpm it aounds disappear, plz if any body face the same problem so plz guide me i will b thankful to u.