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Old 06-08-2011, 07:00 PM   #1
rangerheave
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Default Engine Knock?

i own a 2010 Mustang GT with 8,200 miles on it. Since Ive bought it, I have added JLT CAI, Bama tune, Flowmaster axel back and 3:73 gears.

Ive noticed recently that when the tach gets to just above 4,000 RPM's i hear knocking coming from the engine. Almost like a fast ticking sound.

Assume I am the biggest mechanical moron you have ever spoken with and fill me in on possible reasons why this would occur.
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Old 06-08-2011, 08:16 PM   #2
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You could be running the incorrect octane or your local fuel is suspect or your tune is incorrect or a host of other reasons. Try loading a lower octane tune or tank-up with higher octane fuel and see what happens. Remember: when trying to use a higher octane fuel, you'll need to drive about 10-20 miles before the higher octane from the tank makes it to the engine immediately after filling the tank.
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Old 06-09-2011, 05:51 AM   #3
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Thanks for the reply. I have been hoping I may have just gotten some bad gas and not something internal to the motor. I filled up this morning with 93 Octane so we'll see how things go over the next couple of days.
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Old 06-09-2011, 06:50 AM   #4
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If it continues to knock with the new fuel, load a lower octane tune. It's not too uncommon for fuel in certain areas to be a bit "off" of their rated octane. It's posible you may just need to pull a degree or 2 of timing with the tuner. Altitude can play a role as well as other things. % ethanol doesn't always help, either.
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Old 06-09-2011, 08:30 AM   #5
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I would think ethanol would help due to its higher octane, despite its lower energy?
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Old 06-09-2011, 08:36 AM   #6
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I'm not familiar with how the guys that write the tunes deal with that; the potential to be running straight fuel vs. fuel with "up to 10%" ethanol.
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Old 06-09-2011, 10:20 AM   #7
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I read that E10 fuel is supposed to have the octane rating specified at the pump.
That said, it involves a mixing process, which can lead to an incorrect blend(intentional or not).
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Old 06-09-2011, 03:36 PM   #8
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I doubt its octane, i would be looking for another issue to cause the tick
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Old 06-11-2011, 12:05 PM   #9
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I'm not sure if this is a correct response but I'm in FL and we have a FEW places that sell gas with no ethanol, it's more expensive but maybe you have a place where you live?
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Old 06-11-2011, 01:01 PM   #10
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An exhaust leak can sometimes make a ticking sound at certain rpms.
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