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Integral Backpressure Transducer EGR System

WARNING: This page is about a different variant/trim than selected.
  1. Inspect EGR vacuum hose routing for proper connection. Visually inspect EGR valve for obvious external defects, such as broken diaphragm vacuum nipple and blown-out gaskets. Disconnect and plug EGR vacuum supply hose. Connect a vacuum pump to EGR valve. Start engine. With engine at idle, apply 6 in. Hg to EGR valve.
  2. If vacuum holds and valve opens, EGR valve is defective. With engine at normal operating temperature, vacuum should be available to EGR valve at 4000 RPM on 1.6L engines, 3000 RPM for 2.3L engines or at 2000 RPM on all other engines. If vacuum is not available at specified RPM, check vacuum source.
    CAUTION: DO NOT block tailpipe fully. DO NOT operate engine faster than idle for prolonged periods. Be sure to remove plug from tailpipe at end of test. If these precautions are not followed, engine and/or exhaust system may be damaged.
  3. Clamp a plug (freeze plug may be used) into end of tailpipe; plug should be about 1/16" less than inside diameter. Connect a hand-held vacuum pump to EGR valve. Idle engine and apply vacuum gradually. EGR valve stem/diaphragm should move smoothly and engine speed should drop at least 100 RPM. Vacuum should not drop greater than 1 in. Hg in 30 seconds. If EGR system operates as indicated, system is functioning correctly.
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