Pop noise in front end?

When badly worn, an outer CV joint can cause a rapid, repeated clicking noise, more often when backing up and turning. Popping is normally caused by worn ball joints, worn or loose anti-sway bar links, or in some cases, badly worn struts. When a strut makes the noise, it's where the shaft comes out of the top of the strut body. Often you can feel it by reaching over the top of the tire, through the coil spring, with your fingertip touching that shaft. Push in and out on the top of the tire and you'll feel the shaft moving back and forth. That has to be done with the vehicle sitting at normal ride height with the tire on the ground. If the vehicle is raised up with the suspension hanging down, the weight will prevent the shaft from moving freely, so you won't find the looseness that way. By the time it has gotten that bad, the oil will have leaked out of the strut and covered the outside of the strut body. There will either be a coating of oil, or a layer of gooey dust to indicate that leakage had been taking place for a long time.

Ball joints must be inspected with the tire off the ground so no forces are pushing on them. Use a pry bar to move the lower control arm up and down, and try to move the spindle by tugging on that tire while watching for movement between the ball joint's ball and socket.

Loose anti-sway bar links can often be found by placing your fingertips around them while a helper bounces the vehicle a little. You'll feel the clunking if there's excessive wear between the parts of the link.

Those are the most common causes of noises. Beyond that, we look for broken or missing anti-rattle hardware on brake calipers, worn universal joints in the steering linkage, worn upper strut mounts, and things like that. Clues we look for include under what conditions the noise occurs, and whether it occurs once at a time or multiple times, only on bumpy roads vs. when changing direction on a smooth road.

Here's links to some articles that might provide more information or better explanations:

https://www.2carpros.com/articles/symptoms-of-a-bad-cv-axle-joint

https://www.2carpros.com/articles/fixing-loud-thump-noise-when-shifting-transmission-into-reverse-a-step-by-step-guide

https://www.2carpros.com/articles/diagnosing-and-fixing-popping-noises-in-your-automobile-a-step-by-step-guide

https://www.2carpros.com/articles/comprehensive-guide-understanding-and-fixing-automotive-front-suspension-clunking-noises

https://www.2carpros.com/articles/popping-noise