Flex fuel vs. Reg gas

Asked by Mustards Jan 25, 2018 at 09:04 PM about the 2011 Ford F-150 FX4 SuperCrew 4WD

Question type: Maintenance & Repair

I have a 2011 F150 5.0 Flex fuel. When i use E85, truck runs
like a bull, but purrs like a kitten. When i use regular gas, I
hear valves chatter. Sounds almost like lifter chatter, but
motor runs strong! Not sure what I'm hearing and why.

5 Answers
157,525

Bob answered 6 years ago

Try some mid grade or premium fuel to see if the noise goes away. E-85 is about 100+ octane and that is what is stopping the pinging. You truck should not be pinging with regular fuel. Is the check engine light on? How many miles on it?

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110

GuruW7GFR answered 5 years ago

So which is better regular few or E85 to run in my Ford 150

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Harleydude66 answered 5 years ago

Change your spark plugs. I had the same problem I have a 2010 with a 113,00. I changed them because I wasn’t sure if they ever were changed before me. Purrs like a kitten.

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30

GuruS55W9 answered 4 years ago

I have a 2012 5.0 that the valves are tapping when under load. I have been running 87. should I run high test?

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