i have a problem here....my idsi engine has started to do knocking on petrol...no problem on cng at all...but on petrol,when i push it hard,it produces sounds frm engine like kir kir kir... a frnd said its knocking,im not sure though....its there frm some time but it was too low to b heard but now its easily audible...wast shud i do?
as i drive on cng,shud i leave it as it is or shud i get it fixed? wat could b the reason nd how to rectify the problem?
note that no engine tuning or anything has been done in the recent past,last tuning was done around 7-8k kms before...
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