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.
06-08-2011 08:16 PM by Nuke
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.
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.
06-09-2011 06:50 AM by Nuke
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.
I would think ethanol would help due to its higher octane, despite its lower energy?
06-09-2011 08:36 AM by Nuke
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.
06-09-2011 10:20 AM by ski
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).
I doubt its octane, i would be looking for another issue to cause the tick
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?
An exhaust leak can sometimes make a ticking sound at certain rpms.