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HOMESERVICE MANUALSCHEVROLET1988BERETTA 2.8 W, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMRESTRICTED EXHAUST SYSTEM CHECK (CHART B1)TROUBLE SHOOTINGRESTRICTED EXHAUST CHECK 2 (ALL WITHOUT AIR OR PULSAIR)
1988 Chevrolet Beretta 2.8 W, Standard

Restricted Exhaust Check 2 (All Without Air Or PULSAIR)

1988 Chevrolet Beretta 2.8 W, StandardSECTION Restricted Exhaust Check 2 (All Without Air Or PULSAIR)
  1. With engine at normal operating temperature, connect a vacuum gauge to any convenient vacuum port in intake manifold.
  2. Disconnect EGR solenoid electrical connector or connect EGR valve directly to vacuum source, by-passing any switches or solenoids.
  3. Run engine at 1000 RPM and record vacuum reading.
  4. Increase RPM slowly to 2500 RPM and note vacuum reading.
  5. If vacuum reading at 2500 RPM decreases more than 3 in. Hg from reading at 1000 RPM, inspect exhaust system for restrictions.
  6. Disconnect exhaust pipe from engine and repeat steps 3) and 4). If vacuum reading still drops more than 3 in. Hg with exhaust disconnected, check valve timing.
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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.