Originally posted by 1999sesport:
I noticed today that it does it when you hit the gas enough to speed up ut not change gears in the tranny and when it changes it stops. Like i said i dont think its a big prob. i was just wondering what the noise is from.
What you describe is making the engine "lug" just a bit because you're calling for acceleration in the same gear. The engine rpm's drop which causes it to have to work harder and makes it ping a little. If you'd just put in 1 tank of mid grade (89 octane) gas, as stated previously, I think you'd notice the problem would go away. The higher octane gas burns just a little more evenly which causes fewer hotspots within the cylinder. Hotspots are the cause of the detonation(pinging) because they cause uncontrolled burning of the richer fuel/air mixture in those areas. At least I think that's how I remember reading on the subject years ago. Just try it and let us know how it turns out. 
'99 Sport TropicGreen,Duratec, SVT exhaust, Brembo rotors, Ceramic pads, K&N filters(oil & air), Alpine CDM7874, Polk DB570 speakers front and rear. Fog light mod. 50% Formula One tint.
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