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Engine Controls - System/component Tests - Turbo: Overview Eagle Talon II

Testing & Diagnostics 2 illustrations ~534 words

EGR System Operation

  1. Disconnect vacuum hose with Green stripe from EGR solenoid located on firewall, just below wiper arm. see scheme 22
  2. Using "T" fitting, install vacuum gauge between EGR solenoid and disconnected vacuum hose. Start engine and note vacuum with throttle at idle position and when quickly opening the throttle.
  3. With engine coolant temperature of 68°F (20°C) or less, no vacuum should exist with throttle at idle and when quickly opened. With engine coolant temperature of 176°F (80°C) or more, no vacuum should exist with throttle at idle, but vacuum should momentarily increase to more than 3.9 in. Hg when throttle is opened quickly.
  4. Shut engine off. Remove "T" fitting and vacuum gauge.
  5. Start engine and allow engine to idle. Using vacuum pump, apply at least 7.9 in. Hg of vacuum at vacuum hose fitting on top of EGR valve while noting if engine stalls or engine idle becomes unstable. If engine stalls or engine idle becomes unstable, EGR valve is operating.
  6. To check EGR valve vacuum supply, disconnect vacuum hose with White stripe from throttle body. This is the vacuum hose that goes from throttle body to EGR solenoid.
  7. Connect vacuum gauge on throttle body where vacuum hose was connected. Start engine. Increase engine speed and note vacuum reading.
  8. Vacuum should remain constant regardless of engine speed. If vacuum remains constant regardless of engine speed vacuum supply is okay. If no vacuum exists, check for restricted vacuum port on throttle body. Remove vacuum gauge and reinstall vacuum hose.

EVAP Emission Control System Operation

  1. Disconnect purge control vacuum hose with Red stripe from throttle body. (Scheme 88) Connect vacuum pump to purge control vacuum hose. Install plug on vacuum hose fitting on throttle body where purge control vacuum hose was connected.
  2. Apply 16 in. Hg vacuum to purge control vacuum hose. Start engine and maintain engine speed at 3000 RPM.
  3. With engine coolant temperature of 104°F (40°C) or less, vacuum should be maintained. With engine coolant temperature of 176°F (80°C) or more, vacuum should not be maintained.
  4. Remove vacuum pump. Remove plug and reconnect purge control vacuum hose on throttle body. Disconnect purge air hose from air intake hose. (Scheme 89) Connect vacuum pump to purge air hose.
  5. Install plug on fitting for purge air hose on air intake hose. Start engine and allow engine to idle. Apply 16 in. Hg vacuum to purge air hose.
  6. Suddenly increase engine speed with engine coolant temperature of 176°F (80°C) or more. Vacuum should not be maintained. Shut engine off. Remove vacuum pump and reinstall purge air hose.
  7. To check purge vacuum supply at throttle body, disconnect purge control vacuum hose with Red stripe from throttle body. (Scheme 88)
  8. Connect vacuum gauge on throttle body where purge control vacuum hose was connected. Start engine. Increase engine speed and note vacuum reading. Vacuum should remain constant regardless of engine speed.
  9. If vacuum remains constant regardless of engine speed, vacuum supply is okay. If no vacuum exists or vacuum varies, check for restricted vacuum port on throttle body. Shut engine off. Remove vacuum gauge and reinstall purge control vacuum hose.

Scheme 88

Scheme 88
Scheme 88

Scheme 89

Scheme 89
Scheme 89

See also:
• ADJUSTMENTS - TURBO

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