make sure all your sparks plugs are tight, sounds like a loose plug
try replacing your coolant temp/sensor $5.00
could be your crank shaft
Their engine battery and when the car is on makes a roaring sound when it is started
metahne
it does that because it has a generator which makes the engine makes these sounds
The gas making the popping noise is hydrogen.
the spark breaks the speed of sound
If by "popping noise" you mean backfire, it could be crossed ignition wires, or some sort of misfire.
Internal steam via a microwave or heated pan.
Rice Krispies IHTH :)
you dump him
Avon!!!...It Smells So Good!!!*