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A 2000 Toyota Celica GTS 225k miles engine makes a mild rumbling/grumbling rough sound when accelerating slowly from a stop in drive or reverse only in the 800-1300 RPM band. Does not occur when in Park. Not sure what could be causing this mystery.

Already changed (with OEM Toyota parts) Exhaust gaskets, Plugs, all 4 motor mounts

Sounds almost like something in the engine is loose, pistons, value chatter, I am lost for an answer.

Hopefully someone has a thought, Thanks!

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  • I apologize not sure how I forgot to mention it but all the mounts were replaced already. 3 mounts were replaced about 1 month ago 4th mount about 1 year ago.
    – overflow0100
    Jun 5, 2015 at 1:31

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If you've never changed them, the problem might be one or more of the motor mounts. When one is worn out (especially ones which control the torque of the engine - like a dog bone type), it will start making strange noises when in the lower part of the RPM band from a stop. This can hold especially true if you are not really hearing it when up to speed. You can also feel it jerk a bit while taking off from a stop or hear it clunk (or dull thunk) when stopping hard.

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