Engine Knocks on Downshift
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Senior User
Joined: Feb 2004
Posts: 185
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From: Vancouver, WA
Engine Knocks on Downshift
I have noticed that when I am pulling my trailer at a slow speed, and I have to take off, the engine will knock very slightly right at the downshift. This has only recently started; I have 3,800 miles. Is this something to be worried about? My old truck did this when I used cheap gas, but now I only use Chevron 87 octane. Should I up the octane?
