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Why do my revs go up and down when idle?
If the engine can’t keep idling, it will continue trying to get it revved up to compensate. The cause of the erratic engine you’re experiencing could be a vacuum leak, sensor failure, or an EGR system malfunction.
How do I fix my idle surging?
Turn the engine off again, and reattach the air intake duct work to the throttle body. Start the engine and rev and hold to 1,500 to 2,000 rpm until no white smoke is coming out of the exhaust pipe. Cleaning the Idle Air Speed Control Valve with aerosol throttle cleaner can often solve an idle problem.
What can cause erratic idle?
Erratic engine idle can be caused by various factors, but the most common and likely cause is a dirty or malfunctioning Mass Air Flow (MAF) sensor. This is a device found in fuel-injected cars and measures air flow so that the appropriate amount of fuel can be injected.
Why does my car rev up and down when idle?
When the engine RPM drops below the normal range of 750-800 RPM (for most cars), this often times will cause the engine to stall indicating a dirty or faulty idle air control valve. Since your car is idling up and down, this may suggest that it may be receiving incorrect voltage causing it to fluctuate erratically.
Why does my engine idle at low speeds?
This may be related to a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle.
When does the Honda engine rev up and down?
When I’m stopped at a red light, the engine revs up to about 2k-3k rpm and then down to 1k rpm. This cycle repeats about once every two seconds. My foot is off the gas, and it happens regardless of whether the clutch is in and I’m in gear or the clutch is out and I’m in neutral. It doesn’t happen consistently; sometimes it behaves normally.
How does the idle air control valve work?
The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and at idle. This valve is controlled by the vehicle’s computer which will adjust idle speed based upon other measurements such as engine temperature, intake air temperature and electrical system load or voltage.