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That is a lower grade of fuel then your engine was designed to burn. That is called detonation of fuel which means the fuel is burn before the piston is in the right position to be pushed down in the power stroke,
Adjusting the timing is required if the fuel grade is correct. The sound itself is the piston about to go into power stroke is pushing slightly against the rest of the engine.
What else can I help you with?
What happens if your car rattles when you push gas petal?
Excessive spark knock (aka, pre-ignition, pinging) can cause serious damage to the engine if not corrected.
2000 Mazda 626?
why does my car turn of when i push the gas
When you push on the gas the car poppes?
change the plugs and wires.
Why when you push gas peddle Mazda Millenia takes of slow and RPMS go up fast?
bad knock sensor
High acceleration of car?
push the gas pedal really hard
How can you tell if the engine is on or off in my Prius?
If you push the gas and the car goes, its on.
How can you thaw out the gas line in your car?
Push it into a heated garage and wait.
Infinity GX35 gas tank lid opener?
unlock the car and push the gas tank lid.
What is the first step in making your car faster?
push on the gas pedal, man!!
Car dies when trying to put into gear?
Push in the clutch and give it more gas.
How do you make a car function without gas or batteries?
Get it to the top of a hill and give it a push
What causes the car not to move when you push gas pedal?
You forgot to release the parking brake.
