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HOMESERVICE MANUALSGMC1992RALLY CAMPER SPECIAL 6.2 JREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEEMISSIONSEGR FUNCTION TESTING - DIESEL GENERAL MOTORSGENERAL MOTORSTEST 1DIESEL EGR (1982-89)
1992 GMC Rally Camper Special 6.2 J

Diesel EGR (1982-89)

1992 GMC Rally Camper Special 6.2 JSECTION Diesel EGR (1982-89)
  1. Warm engine to normal operating temperature. Remove air cleaner cover to observe operation of EGR valve. With engine at idle, EGR valve should be open. If valve is not open, check and correct any electrical and hose connection which may be loose or disconnected.
  2. Disconnect vacuum hose from EGR valve. EGR valve head should drop with noticeable reduction in noise. If EGR valve does not operate as specified, clean or replace EGR valve as necessary. Reconnect vacuum hose.
  3. With engine at idle, vacuum hose to EGR valve should have at least 20 in. Hg. If vacuum is not present, check output to vacuum pump at pump. Pump should produce a minimum of 20 in. Hg.
  4. Turn engine off. Disconnect vacuum hose to EGR valve. Connect vacuum pump to EGR valve and apply 10 in. Hg. EGR valve should move up and stay up for at least 20 seconds. If not, replace EGR valve.
RENDER: 1.0x

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When to See a Mechanic

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.