A backfiring engine can create a loud sound that might surprise you, but that's not the worst of it. It also may mean that your engine has deeper problems that may be putting your vehicle's health at risk. The best way to handle an engine that backfires is to bring it to an authorized Toyota service center. Once there, the technicians will inspect your vehicle. The problem will likely be due to one of the following issues: 4. Old Engine Tech While modern engines don't backfire much, it was a much more common occurrence in older engines. The most common cause of backfiring in old engines? Carburetors. If carburetors weren't properly tuned, they could cause backfires. Carburetors fell out of fashion in the late 1980s , so your Toyota is unlikely to have them. But if you're rocking a vintage '60s Land Cruiser or an MR2 from the early 1980s, the carburetor might be the cause of your woes. 3. Bad Engine Timing This one is also uncommon on modern engines--but, unl...