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FUEGO Turbo

  1. With engine cold (coolant temperature less than 113° F (45°C), accelerate engine while observing EGR valve stem. Valve stem should not move.
  2. Warm engine to normal operating temperature. Accelerate engine while watching valve stem. Stem movement within 5-6 seconds indicates valve is operating.
  3. With engine warm, transmission in 5th gear and clutch disengaged, accelerate engine and observe valve stem. Valve stem should not move. If movement is observed, replace 5th gear transmission switch.
  4. Disconnect wires at pressure surge valve terminals and connect ohmmeter leads to terminals. With engine warm and idling, resistance should register infinity. With engine stopped, resistance should be zero. If surge valve fails either test, it must be replaced. If replacement valve fails tests, replace vacuum reservoir.
    NOTE: If the above 4 tests revealed no malfunction, system operation is okay. If any test revealed a malfunction that could not be corrected with parts replacement, proceed with the following tests.
  5. Disconnect wires from coolant temperature switch and connect ohmmeter leads to terminals. With engine warm, resistance should measure zero. If not, replace coolant temperature switch.
  6. Disconnect wires from 5th gear transmission switch and connect ohmmeter leads to terminals. In gears 1 through 4 resistance should measure zero. In 5th gear resistance should register infinity. If switch fails either test, replacement is required.
  7. With engine stopped, disconnect throttle housing vacuum hose from solenoid valve. Apply vacuum to solenoid valve. If vacuum leaks occur, replace solenoid valve (provided vacuum hose connections are tight and not leaking).
  8. With engine stopped, disconnect throttle housing vacuum hose from solenoid valve. Energize solenoid valve terminals with 12 volts. EGR valve should open. If not, replace solenoid valve or EGR valve.
  9. Disconnect hose at EGR valve. Apply vacuum to solenoid valve. Energize solenoid valve with 12 volts. If vacuum leaks occur, replace solenoid valve.
  10. If EGR system is still malfunctioning, check EGR electrical circuit for clean and tight electrical connections. Also check for shorts.
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