What causes the idle surge on a Honda?
Inside the valve is a wax pellet (just like a thermostat) that opens and closes a vacuum line that allows additional air to bypass the closed throttle plate at cold idle. The fast idle valve has a reasonably high failure rate. When the valve fails, it causes idle surge. Here’s how to check it out.
What should I do if my idle air control valve is not working?
If the idle air control valve checks out and the fast idle valve doesn’t, then replace the fast idle valve. It’s a little hard to get to, but replacing it is just a matter of loosening the screws, removing the coolant hoses, and replacing the valve.
What does a fast idle valve on a Honda do?
Honda uses most of those same components to determine idle in their vehicle. However, they use a fast idle valve that has engine coolant running through it. Inside the valve is a wax pellet (just like a thermostat) that opens and closes a vacuum line that allows additional air to bypass the closed throttle plate at cold idle.
What to do if your car Idles too fast?
If the lines are hot and you ARE getting vacuum on that removed vacuum line, you can suspect a bad fast idle valve. But continue with the tests before you replace it. 4) Make sure the base idle is set properly. Refer to the shop manual and set base idle according to the procedure. 5) Finally, check the idle air control valve.
Inside the valve is a wax pellet (just like a thermostat) that opens and closes a vacuum line that allows additional air to bypass the closed throttle plate at cold idle. The fast idle valve has a reasonably high failure rate. When the valve fails, it causes idle surge. Here’s how to check it out.
If the idle air control valve checks out and the fast idle valve doesn’t, then replace the fast idle valve. It’s a little hard to get to, but replacing it is just a matter of loosening the screws, removing the coolant hoses, and replacing the valve.
Honda uses most of those same components to determine idle in their vehicle. However, they use a fast idle valve that has engine coolant running through it. Inside the valve is a wax pellet (just like a thermostat) that opens and closes a vacuum line that allows additional air to bypass the closed throttle plate at cold idle.
If the lines are hot and you ARE getting vacuum on that removed vacuum line, you can suspect a bad fast idle valve. But continue with the tests before you replace it. 4) Make sure the base idle is set properly. Refer to the shop manual and set base idle according to the procedure. 5) Finally, check the idle air control valve.
What causes an engine surge in a car?
Step 4 – Some vehicles are equipped with an inline fuel filter, when this filter become plugged it lowers fuel delivery creating an engine surge. Learn more Step 5 – If a vacuum line has caused a leak the engine will surge, as vacuum lines age they can become brittle and fall off the engine or accessory. Learn more
What to do if your Honda has a bad fast idle valve?
There should be NONE. If there’s vacuum on that line, check the coolant hoses at the fast idle valve. They should be HOT. If the lines are hot and you ARE getting vacuum on that removed vacuum line, you can suspect a bad fast idle valve.
Can a vacuum line cause an engine to surge?
Learn more Step 5 – If a vacuum line has caused a leak the engine will surge, as vacuum lines age they can become brittle and fall off the engine or accessory. Learn more Step 6 – If an air intake boot becomes torn and develops a leak it will cause the engine to surge.
Why does my Honda Accord idle all the time?
This is the most common cause of an idle issue on Honda’s. Especially if you just serviced the cooling system and by service the cooling system I mean replaced a radiator, water pump, thermostat, radiator hose, anything where you open the cooling system to replace a part. You MUST follow the procedure outlined in the video.
What do you do when your Honda Idles?
If you’re sure you don’t have any vacuum leaks and you’ve bled the air out of the cooling system and you still have a problem then check the IAC (Idle Air Control valve). You can do this by tapping on it with the butt of a screwdriver while the engine is running. If the idle changes or stumbles in some way you may need to replace it.
What are common reasons my Acura TL has a rough idle?
What are common reasons my Acura TL has a rough idle? While there are a variety of reasons your Acura TL has a rough idle, the most common 3 are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil. See what others are asking about their Acura TL. Get answers from RepairPal’s community of auto experts and enthusiasts.
Why does my car idle all the time?
This will cause the fuel and air mixture to burn inconsistently, which will result in an idle rough engine. Vacuum Leak –There are a lot of hoses that help deliver both fuel and air to the internal combustion chamber. One very common cause of idling rough is a problem with a vacuum hose in the vehicle.
If you’re sure you don’t have any vacuum leaks and you’ve bled the air out of the cooling system and you still have a problem then check the IAC (Idle Air Control valve). You can do this by tapping on it with the butt of a screwdriver while the engine is running. If the idle changes or stumbles in some way you may need to replace it.
What does idle speech mean on a Honda Accord?
This one is more for a hunting or erratic idle, the original speech was for a ‘shaking’ or ‘rough’ idle. For that check out the other link about Honda idle issues or type ‘Idle Speech’ into the search function. Step 1 check for air in the cooling system.
What does the Idle do on a Honda ATV?
The idle adjustment on your Honda ATV controls how much fuel and air get to the engine when the throttle is closed. This allows the engine to stay alive while you are stopped or while coasting with the clutch pulled in. If the idle is not adjusted properly, the engine may rev too high when stopped,…
What kind of engine did the Honda Interceptor have?
Using similar engine internals to the Sabre meant the Interceptor retained the Sabre’s chain drive to the four overhead cams, carrying forward tensioner and cam wear problems that were just showing up on the 1982 bikes.
When did the Honda VF750F interceptor come out?
Race on Sunday . . . The Honda VF750F Interceptor was the offspring of a metaphorical marriage between the revolutionary 996cc V4 FWS1000 U.S. Formula 1 Championship Superbike racer Honda introduced in 1982 and a change in AMA Superbike rules. For the 1983 season, 4-cylinder bikes were limited to 750cc and were required to be production based.
How to fix a surging idle on a Honda?
How to fix a surging idle on Honda vehicles 1) Start by making sure the cooling system is filled with coolant and there’s no air in the system. If it’s low on… 2) Remove the air duct from the throttle body. Then start the engine and cover the throttle body with a solid object… 3) Once the engine
How to test the fast idle valve on a Honda?
3) Once the engine coolant is above 90 degrees F, you can proceed to test the fast idle valve. Start the engine and remove the vacuum line on the lower portion of the throttle body. Check for vacuum. There should be NONE.
How can I tell if my idle control valve is working?
To check if an idle control valve is working properly, start by turning on your engine and letting it run for a minute or 2. Then, when it’s at an idling speed, take note of the RPMs in your car. Next, turn the engine off and disconnect the idle control motor under your hood.
Why does my Honda car run at high idle?
So the computer tries to compensate by adding fuel. That increases the idle speed. Knowing that the accelerator isn’t being applied (by reading the throttle position sensor) the computer sees a high idle as a problem and commands the idle air control valve to close. That makes the engine run worse.