What causes severe intermittent shaking at low idle speed when the air conditioning is on in a 7th-gen Accord?
2 Answers
Idle state refers to the operating condition of the engine when it is running without load, i.e., when the accelerator pedal is fully released while the engine is running, the engine is in idle state. The engine speed during no-load operation is called idle speed, which is the minimum speed at which the engine can maintain normal operation without external power output. A well-functioning engine typically idles between 550-800 RPM. Here is additional information: Diagnosis of idle switch not closing - when the air conditioning is turned on at idle or when steering, if the engine speed does not increase, this can confirm the fault. Solution: Adjust, repair, or replace the throttle position sensor.
I've experienced the same issue with my 7th-gen Accord - when the AC is on, the idle speed drops significantly with intermittent violent shaking that even makes the steering wheel vibrate. This typically happens because the AC compressor suddenly increases engine load, but the idle control system fails to respond promptly. Common culprits include carbon buildup clogging the idle air control valve (affecting airflow) or an overly dirty throttle body causing sluggish response. I personally cleaned those components and saw noticeable vibration improvement. Worn spark plugs causing irregular ignition can also worsen shaking. I'd recommend inspecting the idle control valve and throttle body first, replacing them if necessary. Don't overlook the fuel system either - clogged fuel injectors can disrupt engine operation too. Regular cleaning helps prevent these issues - safety always comes first.
