Johnnie007 Posted January 28, 2019 Report Share Posted January 28, 2019 My edge 3.5 knocks but mechanic says alot of newer car s do it don't worry about it Quote Link to comment Share on other sites More sharing options...
SUV-E Posted January 29, 2019 Report Share Posted January 29, 2019 Mine doesn't knock... Quote Link to comment Share on other sites More sharing options...
TheWizard Posted January 29, 2019 Report Share Posted January 29, 2019 It is not at all unusual for an engine to knock occasionally under loads such as towing, steep grades, or high ambient temperatures but the knocking would be light and intermittent. If you experience knocking during normal driving conditions then something is wrong. The first step would be to fill up at a different gas station - preferably a Top Tier or at least name brand station. It could be that you're just getting bad fuel. If the knocking persists you should have it checked by the dealer or a trusted mechanic (the guy who told you that new cars knock should not be that trusted mechanic). You can run higher octane fuel in the meantime to reduce knocking (higher octane fuel is not "better" but it is more resistant to knocking). Quote Link to comment Share on other sites More sharing options...
Ntrain2k Posted January 30, 2019 Report Share Posted January 30, 2019 There are different kinds of "knock". Knock, as in mechanical knock from excessive engine clearances (PTW, crank and/or rod bearings). Preignition or detonation knock. Could be caused by low octane fuel, massive piston crown carbon build up, etc. Tappet noise from the valvetrain. Which is it? Quote Link to comment Share on other sites More sharing options...
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