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Haynes does not state any differences between flex fuel and regular. they say that if you have pinging or knocking sounds you may have one of the following: 1. incorrect grade of fuel. Fill up with fuel of proper octane rating. 2. Fault in the fuel or electrical systems 3. Improper spark plugs. Check the plug type against the VECI label located in the engine compartment. Also check the plugs and wires for damage. 4. Faulty emissions system 5. Vacuum leak

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Q: How do you fix pinging 2000 ford ranger 3.0 liter flex?
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