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Originally Posted by moontoosoon
Help needed!
Engine makes rattling noise at 2,500-3,000 rpm while speeding.  Gaz number (91, 92) change makes difference in this sound intensity but little. Please advise. I'm tired of it. Gr-r-r-r |
If you sayiing that a different octane gas makes a little difference you may want to check the ping/knock sensor - adjusts and prevents pinging.
Why not let the SO hold it on high idle and see if you can hear where the noise is coming from.