Test Conditions

1991 Cadillac Seville STSSECTION Test Conditions

Codes EO14, EO15, EO16, EO21, EO22, EO26, EO27, EO31, EO32, and EO34 not set. Throttle switch open, throttle angle 6-30 degrees, coolant sensor greater than or equal to 136°F (58°C), oxygen sensor ready (closed loop), RPM greater than or equal to 800 and canister purge has occurred at full duty cycle 10 minutes since engine was running with coolant 176°F (80°C) and throttle angle 10 degrees or greater.

RENDER: 1.0x

NO RELATED

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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.