2002 Ford Thunderbird Knocking?

2002 FORD THUNDERBIRD
65,000 MILES • V8 • 2WD • AUTOMATIC
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HENRYHER
  • MEMBER
  • 5 POSTS
My manual recommends 91 octane gas. We have been putting regular since the gas prices have risen so high. It knocks which I expect but would it harm the engine by using regular?
Jun 5, 2008 at 2:46 PM
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MERLIN2021
  • ✓ASE Certified Mechanic
  • 17,250 POSTS
  • ASE Certified Mechanic
May affect performance, it's tuned for that octane, My Town car calls for premium, but alas it too must survive on regular! Will it hurt? May run a bit dirtier...
Jun 5, 2008 at 2:51 PM
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