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Originally Posted by artbuc
RE: 99 Avalon 3.0 V6 w/83k miles
When I turned off the car, the engine stopped with a little shudder. Has been doing that for a long time. After replacing timing belt, idler pulleys and water pump, engine shudder disappeared. When I turn off the ignition, engine now dies smoothly and quietly.
Can anyone explain this?
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In addition to eliminating shutdown shudder, my car runs much better on the highway.
I just spent an hour reading Google info on timing belt stretch. Very controversial with some saying timing belts ABSOLUTELY DO NOT stretch while others say they do stretch enough to retard timing and affect engine performance. One person actually said Toyota had a history of timing belt stretch problems but did not give any reference to back-up his claim.
Since I did not check timing before, I can not prove anything; but, I'm convinced that the new timing belt noticeably improved engine performance, for whatever reason.