How do you adjust the idle speed on a Harley?
Damage to the screw and its seat may result. Turn idle mixture screw two turns out (counterclockwise) to an idle speed of 1,000 rpm. Adjust the screw 1/2 turn at a time. After each adjustment, reset the idle speed to 1,000 rpm. The maximum adjustment range is 1/2 to 3-1/2 turns. When adjusting the idle mixture screw, make only small adjustments.
How does the IAC system affect the idle speed?
For instance, switching the air conditioning on, increases the engine load. With the IAC system, the computer immediately increases the idle speed to compensate. A cold engine runs with less efficiency and the PCM also commands a higher idle speed. This helps to circulate engine oil and prevents stalling while the engine warms.
When does an engine go from high rpm to idle speed?
An engine must go from high RPM operation to idle, almost instantly. The idle circuit eases the transition and allows a more controlled reduction of speed. When the idle circuit fails, the engine may stall when we suddenly release the throttle.
How does electronic fuel injection affect idle speed?
When engines had carburetors, they always provided a means of adjusting the idle speed. A simple turn of a screw corrected the problem if the engine’s idle speed was too slow or too fast. With electronic Fuel injection they eliminate the manual adjustment and the computer makes all corrections to the engine’s idle speed.
Damage to the screw and its seat may result. Turn idle mixture screw two turns out (counterclockwise) to an idle speed of 1,000 rpm. Adjust the screw 1/2 turn at a time. After each adjustment, reset the idle speed to 1,000 rpm. The maximum adjustment range is 1/2 to 3-1/2 turns. When adjusting the idle mixture screw, make only small adjustments.
What kind of idle does a 2007 Heritage have?
What Jeff just described fixed the idle on a 2007 Heritage. Devildog turned me on to this. Evidently it resets the idle circuitry in a wide number of Harley EFI setups.
How can I reset the idle on my car?
Try this. Turn ignition switch to off. Turn kill switch to run. Rotate ignition switch from off to ignition. The yellow check engine will turn on for a few seconds then off. As soon as the light turns off turn ignition to off. Wait a couple seconds and repeat. Do this four or five times and this should reset the idle.
What should idle speed be on Harley CV carburetor?
After each adjustment, reset the idle speed to 1,000 rpm. The maximum adjustment range is 1/2 to 3-1/2 turns. When adjusting the idle mixture screw, make only small adjustments. Stick with the 1/2 to 1/4 turn rule. Often the smallest adjustment is all that is needed. These procedures may reduce or void any limited warranty coverage.
When to replace the idle air control motor on a Harley?
Direct replacement for Harley p/n 27658-06 on 2007+ EFI models except XL Sportster and 08+ TBW touring models.* When fuel injected Harley motorcycles begin to experience a rough or high idle, or a hard start condition, often this is a result of a faulty Idle Air Control ( IAC) or MAP sensor.
What to do when idle speed is too low?
Below is the “Idle RPM” section from the manual: Use this Tuning Table to set idle RPM to desired setting and to correct idle-related problems. • If engine idle speed seems too low or engine occasionally dies, increase Idle RPM cells in appropriate engine temperature to correct.
Where is the idle mixture on a Harley?
Dry, fluffy or sooty black deposits indicate a rich carburetor air-fuel mixture. Locate the idle mixture screw on the bottom outlet side of the carburetor, in a passageway next to the float bowl. Turning the idle mixture screw in, or clockwise, will lean the idle mixture and turning it out, or counterclockwise, will enrich it.
Dry, fluffy or sooty black deposits indicate a rich carburetor air-fuel mixture. Locate the idle mixture screw on the bottom outlet side of the carburetor, in a passageway next to the float bowl. Turning the idle mixture screw in, or clockwise, will lean the idle mixture and turning it out, or counterclockwise, will enrich it.
Is there an idle air control motor for a Harley?
Write a review Idle Air Control or IAC valve (motor) for Harley motorcycles. Precision made for outstanding performance and manufactured to meet and exceed OEM specifications. Direct replacement for Harley p/n 27658-06 on 2007+ EFI models except XL Sportster and 08+ TBW touring models.*
Below is the “Idle RPM” section from the manual: Use this Tuning Table to set idle RPM to desired setting and to correct idle-related problems. • If engine idle speed seems too low or engine occasionally dies, increase Idle RPM cells in appropriate engine temperature to correct.
What to do if your car won’t idle on its own?
If the engine will not idle on its own during this procedure, adjust the idle set screw on the throttle side of the carburetor until it idles correctly. Now turn the mixture screw outwards (counter-clockwise) until the engine begins to run smoothly, then add 1/8 of a turn.
After each adjustment, reset the idle speed to 1,000 rpm. The maximum adjustment range is 1/2 to 3-1/2 turns. When adjusting the idle mixture screw, make only small adjustments. Stick with the 1/2 to 1/4 turn rule. Often the smallest adjustment is all that is needed. These procedures may reduce or void any limited warranty coverage.
How do you increase the idle speed on a Harley Davidson?
Turn the screw clockwise to increase idle speed and counterclockwise to decrease it. Your tachometer will give you the idle speed, but if your bike isn’t fitted with one, then play it by ear; if you go too low, the bike will either cut out or stumble when you twist the throttle, while too high and it will sound wrong.
How do you change the idle speed on a T-30?
Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM. Turn off the engine and disconnect the negative battery terminal from the battery using a wrench. Reconnect the IAC valve.
If the engine will not idle on its own during this procedure, adjust the idle set screw on the throttle side of the carburetor until it idles correctly. Now turn the mixture screw outwards (counter-clockwise) until the engine begins to run smoothly, then add 1/8 of a turn.
How to reset the idle speed in a GM TBI?
Unplug the IAC valve located on the passenger side, rear of the throttle body. Start the engine. Insert a T-30 size Torx driver into the Idle adjustment screw that is located behind the plug removed earlier. Turn the screw to adjust the idle speed to 650 RPM +/- 50 RPM.