1986 Chevrolet Spectrum 2D Hatchback, AutomaticFACTORY OEM SERVICE PROCEDURE

EGR System

  1. Connect a tachometer to engine. Disconnect vacuum hose 3-way connector from canister, and connect a vacuum gauge to 3-way connector between EGR valve and TVV. When engine is cold, start engine and check that vacuum gauge indicates no vacuum at any speed.
  2. Warm up engine and check that vacuum gauge indicates no vacuum at idle and over 2 in. Hg vacuum at 3500 RPM. Disconnect vacuum hose to EGR valve and plug hose. Check that engine speed increases a little. Stop engine, push diaphragm plate by hand and release it. Check that diaphragm plate returns smoothly to original position.
    CAUTION: If valve is hot, it may be necessary to wear gloves to avoid burning fingers.
  3. If a problem is found, inspect each part. Disconnect vacuum gauge and connect vacuum hose 3-way connector to canister.
Factory Service Tools

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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.

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