The Dodge Dakota truck was produced with a 2.6 liter or 3.9 liter engine. Both of these engine used a carburetor to regulate and supply fuel to the engine. Idle speed adjustment can be required for various reasons, including the installation of a new carburetor or a rebuild of the current carburetor. Adjust of the idle varies between engine models and requiring different steps to be executed.
Tools Used: Screwdriver, Tachometer, Vacuum hose plugs
Adjust the Idle
2.6 Liter Engine
Start the engine and let it run until it reaches the normal operating temperature as indicated on the temperature gauge located in the instrument cluster.
Turn all electrical accessories and lights to the off position.
Attach an external tachometer to the engine and verify the tachometer is set for measuring a four-cylinder engine.
Run the engine at 2500 rpm for approximately 10 to 15 seconds, then return to idle speed for two minutes.
Adjust the idle speed with a Phillips screwdriver until the tachometer reads 850 rpm.
Remove the external tachometer from the engine before driving the Dakota.
3.9 Liter Engine
Start the engine and let it run until it reaches the normal operating temperature as indicated on the temperature gauge located in the instrument cluster.
Turn off the engine and disconnect the EGR hose and plug it with a vacuum hose plug.
Disconnect the hose attached to the PCV valve and leave the hose open.
Turn all electrical accessories and lights to the off position.
Attach an external tachometer to the engine and verify the tachometer is set for measuring a six-cylinder engine.
Start the engine an let it run for two minutes. Use the Phillips screwdriver to rotate the idle screw located on the carburetor until the engine idles at 750 rpm.
Reattach the PVC hose to the PVC valve. Unplug the EGR hose and reattach to the EGR valve. Remove the external tachometer attached in Step 5.
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