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Honda won't tell you, but some 3.5L engines, the same engine as an Acura MDX, are a high compression engines. My '07 Odyssey had the same problem and we went through all the usual fixes for pre-ignition or pinging under low RPM, high torque acceleration - nothing worked. Until...I put in 93 octane high test gas. Problem solved. High compression engines require high octane or there will be pre-ignition/pinging.
I don't know why Honda won't tell you - unless it's because they advertise the 3.5L as only needing regular octane. This has been the easiest Honda fix for me. The leaking rack seal at 64K and the bad front motor mount at 79K are problems I've never had with any vehicle, including American cars. When I called Honda USA for "Goodwill" on the rack-seal, they were arrogant, refused to work with me, and don't care about repeat customers. No more Hondas for me.
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