What would cause idle to fluctuate?
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. Although it is positioned after the air filter, over time, contaminants can build up on the sensor.
What causes low rpm at idle?
When you notice your car idling low, suspect three common sources of trouble: Faulty or clogged idle air control valve. Vacuum leaks. Ignition system problems.
Is a low idle bad?
Reasonable low idle time. Low idle time cannot exceed 10 minutes- If there is a long period of low idle speed during the work, it is recommended to increase the engine speed after the low idle time exceeds 10 minutes. It is recommended to keep the low idle speed for 3~5 minutes after the high load is turned off.
What does a fast idle thermo valve do?
The fast idle thermo valve (FITV), commonly used on many Honda cars, is a sensor that controls the fast idle or warmup circuit of the fuel system. The FITV contains a thermowax device that controls a plunger.
How to solve Honda idle issues, rough idle?
When watching the Honda idle video please remember that adjusting the FITV is the LAST step in the process and you need to back it off at least 1/2 turn after it bottoms out or it will not start properly when cold. I have many of you come to me and say that you’ve adjusted the FITV and you still have an issue.
Can a FITV cause a Honda to idle?
The FITV is not the only thing that can cause an idle issue with your Honda so be sure to follow ALL the steps first before making that adjustment. If playback doesn’t begin shortly, try restarting your device.
What causes high idle on a Honda Accord?
I will admit however that the OE valves sometimes come apart internally and cause idle problems. If that’s the case, it creates a large vacuum leak. When this happens, it effects the idle as well as fuel economy. Usually if the PCV valve fails in this manner, you’ll experience a ‘high’ or ‘hunting’ idle.