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Minimum Airflow Rate (2.2L & 2.5L)

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1994 Plymouth Sundance, 1994 Plymouth Acclaim, 1994 Eagle Vision, 1994 Dodge Spirit, and 1994 Dodge Shadow. However, it is still accessible from the selected car via links, so may be relevant.
  1. Connect Diagnostic Readout Box (DRB) to vehicle. Remove air cleaner assembly. Disconnect and plug heated air door vacuum hose. Ensure engine is at operating temperature (cooling fan cycles on and off at least once).
  2. Connect timing light and tachometer to engine. Disconnect engine coolant temperature sensor. Ensure ignition timing is to specification. See 4-CYLINDER IGNITION TIMING  under IGNITION TIMING. Turn engine off, and reconnect coolant temperature sensor.
  3. Disconnect PCV hose from intake manifold. Attach Air Metering Fitting (6457) to manifold. Orifice size is .125" (3 mm). Start engine and allow it to idle for at least one minute.
  4. Using DRB, access MINIMUM AIRFLOW IDLE SPEED. The Idle Speed Control (ISC) motor should fully close, fuel delivery should not change, and idle spark advance should be fixed. Ensure proper RPM is displayed on DRB.
  5. Check idle RPM (minimum airflow rate) with tachometer. See 4-CYLINDER MINIMUM AIRFLOW RATE SPECIFICATIONS table. If minimum airflow rate is not to specification, replace throttle body. If minimum airflow rate is correct, turn engine off, and disconnect all test equipment.
4-CYLINDER MINIMUM AIRFLOW RATE SPECIFICATIONS

Application RPM
2.2L & 2.5L TBI 800-1200
2.5L Flex-Fuel 700-1400
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