I just bought a land rover discovery series 1, when I switch from drive to reverse it makes a loud popping noise.

Hi welcome main problems are the abs valves causing the 3 dash lights (search 3 amigos online) a really badly sited compressor can cause air suspension models to fail giving the bags a slow leak the V8 is a solid engine but can have radiator expansion tank and cap failures
the other issue is electrics windows and door looms are problematic

Tons of possibilities here (transmission, differential, motor mounts, transmission mounts....), so I'll ask some debug questions to help narrow it down. Does it make the noise when shifting into reverse? Also, does it make the noise only when shifting from park, or also when shifting from neutral (into drive or into reverse)? Did the noise start as an occasional, softer noise and get worse over time, or did it start suddenly? Does the vehicle lurch at the same time as the noise? What happens when you go from Reverse to Drive, or vice versa? Has any work been done recently (brakes, tires, alignment, suspension, transmission)?

Transmission bad.

sounds like a worn timing chain--getit fixed before u buy a new engine!

Last time mine did that it was from the front Differential, check if there is oil in it, also check the seals on it.

dunah

If your vehicle is a Discovery Series II, it is not equipped with a fuel filter. If it is a Discovery Series I it is in the right rear wheel well towards the front. Hope this helps out.

Best of Luck

could be the turbo but check all turbo hoses carefully for splits

built in the UK god save the queen ---- look on the opposite side of the car ,they are all kack handed in uk and drive on the wrong side of the road so chances are its on the passenger side .

does it also clunk when you are driving along in 1st or 2nd gear and take your foot off the throttle?...maybe a unijoint.

need to change a new pump.