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rangerheave 06-08-2011 07:00 PM

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.

Nuke 06-08-2011 08:16 PM

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.

rangerheave 06-09-2011 05:51 AM

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.

Nuke 06-09-2011 06:50 AM

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.

siggyfreud 06-09-2011 08:30 AM

I would think ethanol would help due to its higher octane, despite its lower energy?

Nuke 06-09-2011 08:36 AM

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.

ski 06-09-2011 10:20 AM

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).

Burns331 06-09-2011 03:36 PM

I doubt its octane, i would be looking for another issue to cause the tick

MurderedStang 06-11-2011 12:05 PM

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?

Daniel98GT 06-11-2011 01:01 PM

An exhaust leak can sometimes make a ticking sound at certain rpms.

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