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HOMESERVICE MANUALSJEEP1994CHEROKEE COUNTRY, 4D UTILITY, RWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMEGR FUNCTION TESTINGEGR VALVEPORTED EGR SYSTEM
1994 Jeep Cherokee Country, 4D Utility, RWD

Ported EGR System

1994 Jeep Cherokee Country, 4D Utility, RWDSECTION Ported EGR System
  1. Check vacuum hoses for correct routing. Warm engine to normal operating temperature. Set engine speed to fast idle (or high enough to obtain 5 in Hg at EGR valve). Protect finger from heat and place finger beneath EGR valve so diaphragm movement can be felt.
  2. Disconnect vacuum hose from EGR valve. Diaphragm should move downward (valve closed) and increase in engine RPM should be noticed. Reconnect vacuum hose to EGR valve. Diaphragm should move upward (valve open) and engine speed should decrease by at least 150 RPM.
  3. If EGR diaphragm does not move during the test, check for vacuum at hose. If vacuum is present, replace EGR valve. If vacuum is not present, check for leaking vacuum hose or plugged carburetor port. If EGR diaphragm moves during the test, but RPM does not change, check for plugged EGR port or passages.
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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.