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WALKER® EXHAUST SYSTEMS: Backpressure
WALKER® EXHAUST SYSTEMS: Backpressure
Excessive system backpressure can generate a converter efficiency code. Although backpressure varies with application, typically the pressure should be less than 3 psi at 2,000 rpm, and less than 1.5 psi at idle.
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  • Using the O2 Sensor ports, check for excessive backpressure ahead of - and behind - the converter.
  • High backpressure behind the converter indicates a restricted muffler or resonator.
  • High backpressure ahead of the converter indicates a restricted converter.
  • High backpressure at the exhaust manifold indicates a blocked Y-connection.
  • Excessive backpressure will adversely affect AFR, leading to excessive emissions.
WALKER® EXHAUST SYSTEMS: Backpressure