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Toyota Repair/Piston slap


Hi Ted!

Hoping you can help with an unrelated Toyota issue.

Had a timing belt replaced on my 1999 Accord LX 4 cyl over a year ago. It's out of warranty now. Anyway, ever since having this done, the engine has developed piston slap when cold and my gas mileage has declined noticeably. I am the original owner so I know what noise it "wasn't" making before the new timing belt job. The mechanic at the time said it was piston slap and perhaps I should have questioned him further about it.  

Any ideas what might be causing this?

Thanks a lot :)

Excessive piston wear will typically cause the noise you are describing, usually the bottom part of the piston (skirt) will cause the noise due to either wear or scoring due to loss of lubrication. Replacing the timing belt will not cause this unless they also changed the oil and forgot to put oil in then realized their mistake.
High mileage and infrequent oil changes are also a factor.

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Ted Ritter


I have more than 28 years experience as toyota technician, I will be able to answer most questions related to the Toyota product line up to the present year models,I am located in the US but welcome questions from other regions of the world. When asking a question please provide specific information: year,model, engine,transmission information. Provide as much information as possible including a brief repair history if possible. I have been a volunteer here for more ten years an have answered over 16,000 questions helping Toyota owners with their problems and save thousands of dollars without any compensation, some of my answers are published on many other websites including google and various automotive forums. DONATIONS ARE VERY MUCH APPRECIATED, IF YOU HAVE RECIEVED HELPFUL INFORMATION PLEASE MAKE A DONATION. AS OF TODAY (JULY 22, 2014) ALL REQUESTED GRAPHICS, ILLUSTRATIONS, DIAGRAMS, PHOTOS, WILL REQUIRE THE MINUMUM DONATION UP FRONT.


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