How do you know the throttle needs cleaning?

1, the most obvious feature of dirty throttle is that the acceleration is very fleshy and the idle speed is unstable (sometimes big and sometimes small). These failures can be directly felt by the owners themselves.

2, all EFI vehicles, as long as the engine is empty, neutral, boom throttle 3000 rpm, and then suddenly closed oil, at this time pay attention to observe the tachometer pointer:

When the pointer quickly drops to about 800 rpm and stabilizes, the throttle valve is slightly dirty and basically normal, so it doesn't need cleaning.

When the pointer quickly drops below 800 rpm or even 700 rpm, and then slowly rises to about 800 rpm, the idle speed follows from small to large, and then the throttle valve is seriously fouled and needs to be cleaned immediately.

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