Your question: What makes an engine crackle?

That crackle comes from excess, unburnt fuel burning and exploding in the exhaust pipe. Everything from a light crackle to the full gunshot-like sound of a “bang-bang” Anti-Lag System (common in Rally cars) to shooting flames are all caused by the fuel burning in the exhaust that comes with running rich.

Is exhaust popping bad?

It is harmless for the most part. Even a perfectly tuned engine can pop its exhaust. The exact same thing happens in two strokes at low RPMs all the time, which is what gives their unique erratic idling sound – the mixture sometimes burns fully in the cylinder, sometimes in the exhaust.

Why does my car crackle when I rev it?

When you lift and revs start to drop, excess unburned fuel is dumped into the header. The fuel ignites in the header instead of in the cylinder – that causes the popping.

Is car backfire illegal?

It’s illegal to route your exhaust system through your vehicle’s passenger compartment. Backfires are illegal under any circumstance, and you can be ticketed if your car has a mechanical problem that causes frequent engine backfires.

Does backfire hurt engine?

Backfires and afterfires are worth paying attention to since they can cause engine damage, power loss, and decreased fuel efficiency. There’s a variety of factors that can cause your car to backfire, but the most common ones are having a poor air to fuel ratio, a misfiring spark plug, or good old-fashioned bad timing.

IT IS INTERESTING:  Can a VFD increase motor speed?

What is the popping sound from exhaust?

Decel popping is caused by the detonation of unburned fuel in the exhaust pipe. This happens with high flow exhausts that allow more fresh air to be pulled into the pipe, causing the exhaust temperature to rise and detonate any unburnt fuel.

Why does my exhaust crackle and pop?

Pops and bangs are generated when an explosion echoes in the exhaust. This is either fuel touching the hot exhaust before exploding, or an explosion happening earlier in the system and reverberating through the exhaust.

What is the popping sound under my car?

Popping Turns



The noise most likely indicates that you have a damaged constant velocity, or CV, joint in the front axle. Without replacement, the joint could become completely useless and dramatically impact your vehicle’s handling.

Car repair school