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Home >> Subaru >> 1988 >> XT DL >> Repair and Diagnosis >> Engine Performance >> System >> Fuel Injection System - BOSCH AFC >> Testing >> Fuel Injectors & Resistors
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Fuel Injectors & Resistors

  1. Connect tachometer to engine. Start engine and run at idle. Remove harness connector from injectors one at a time. Engine idle speed should drop 100-300 RPM as each injector is disconnected. If engine idle speed does not drop, check the wiring connector, injector resistance or injection signal from the computer.
  2. Disconnect electrical connector from each injector. Measure injector resistance. See INJECTOR RESISTANCE SPECIFICATIONS table. If injector is not to specification, replace injector.
    INJECTOR RESISTANCE SPECIFICATIONS

    Application Ohms
    Subaru
    SPFI .5-2
    MPFI 2-3
    MPFI Resistor 5.8-6.5
  3. Check injector resistors.
  4. Disconnect resistor block. Measure resistance between terminal "W" and to any other terminal. If reading is not 5.8-6.5 ohms, replace resistor block.
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