07 BMW 530li starts with snoring.

This is usually caused by engine or exhaust system failure.

1. According to the description, the reasons and solutions are as follows:

1. The air filter is blocked. The air inlet will be blocked by the air filter, and there will be a grunt when the engine starts. You can check and replace the air filter, which usually solves the problem.

2. Throttle fault: Throttle controls air-fuel ratio. If the throttle fails or is seriously worn, the air-fuel ratio will be unbalanced and the engine will purr after starting. Need to detect and repair or replace the throttle valve.

3. Ignition coil failure: The ignition coil provides high-voltage current to ignite the engine. If the coil is damaged, it will lead to poor ignition, unstable operation and grunting after the engine is started. The ignition coil needs to be replaced with a new one.

4, exhaust pipe blockage: exhaust pipe blockage will not directly lead to starting difficulties, but after the engine starts, it will make a whine because of poor exhaust. It is necessary to clean or replace the blocked exhaust pipe section.

5. Three-way catalyst failure: Three-way catalyst is mainly used to purify waste gas. If the catalytic converter fails or is blocked, the exhaust gas will not flow out normally, and it will be accompanied by grunting after starting. The three-way catalytic converter needs to be tested and replaced.