Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSDODGE AND RAM1990DAKOTA LE, 2D PICKUP, 3.9 X, 4WD, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - BASIC TESTING - V6MINIMUM AIRFLOW TESTS3.0L
1990 Dodge and Ram Dakota LE, 2D Pickup, 3.9 X, 4WD, Automatic
Minimum Airflow Tests: 3.0L
1990 Dodge and Ram Dakota LE, 2D Pickup, 3.9 X, 4WD, AutomaticSECTION 3.0L
- Ensure engine is at operating temperature. Connect timing check device and tachometer. Disconnect engine coolant temperature sensor.
- Set basic timing to 10-14° BTDC. Shut off engine. Reconnect engine coolant temperature sensor. Disconnect PCV hose from PCV valve.
- Plug PCV valve nipple. Disconnect idle purge hose at tee fitting. Attach Orifice (6457) to intake purge hose. Orifice size is .125" (3 mm).
- Connect Diagnostic Readout Box II (DRB-II). Start engine. Let engine idle for at least one minute.
- Using DRB-II, access MINIMUM AIRFLOW IDLE SPEED mode. When this mode is accessed, AIS motor will fully close, spark advance will be fixed and engine RPM will be displayed on DRB-II.
- Check idle RPM with tachometer. See MINIMUM AIRFLOW IDLE SPEED table. If minimum airflow idle speed is not to specification, replace throttle body. Disconnect all test equipment.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.