I hear a strange ticking sound when pressing on the accelerator pedal and wonder what may be the problem. Could the expert in this forum please give me some advices. Thank you!!

What type of gas are you using?

Does it increase with vehicle speed, or with the pressing of the pedal?

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

I am not the expert, but it will help the expert if you are more clear on the sound. Also what year is the car?

Is the sound like something rattling in a metal can? Or is it like a clock ticking?

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1998 C230 330,000 miles (currently dead of second failed EIS, yours will fail too, turning you into the dealer's personal human cash machine)
1988 F150 144,000 miles (leaks all the colors of the rainbow)
Previous stars: 1981 Brava 210,000 miles, 1978 128 150,000 miles, 1977 B200 Van 175,000 miles, 1972 Vega (great, if rusty, car), 1972 Celica, 1986.5 Supra

Sorry! I forgot to specify that the car is a 2002 E320 AV.

It sounds like clock ticking and ticking faster when accelerate further.

Thank you all for replying!!