What Does A Loud Knocking Noise Come From The Motor?


5 Answers

Steven Dennis Profile
Steven Dennis answered
Sounds to me like a piston rod could be or beginning to break.  Has the engine ever been over revved or anything?  I had the same problem on my 1991 honda civic, thats what it turned out to be.
Anonymous Profile
Anonymous answered
Means, no fun!

By the way, when you say "Loud Knocking Noise"---does it sound like someone banging a hammer--really fast (about 5,000 times a minute)-against a wall.--means you got problems with your pistons and/or Rods.
More you drive it, more HOSED you're going to be! (by design, that chamber where the piston resides is supposed to be "air tight" (so the "explosion" can occur--*Grin*)...If that thing even has as much as a BB's worth of "excess space" in that're causing bad problems---and a new engine is in your future.


Is it more "tin" sounding (like metal hitting metal)----the latter could be a valve/lifter problem.

Either way, hate to be the giver of bad news, but you better start saving up NOW!--pulling out/replacing an engine is not cheap!
John Profile
John answered
Could be you flat spotted a roller rocker,rocker, dropped a lifter.
Anonymous Profile
Anonymous answered
Means time for a new motor

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