1990 Mazda B2600i Base, 2D PickupFACTORY OEM SERVICE PROCEDURE

Altitude Compensation System

Disconnect high altitude compensation system air hoses from carburetor. See Fig 1 . Check high altitude compensator by blowing through each disconnected air hose. At altitude of higher than 1640 feet, air should pass through each hose. At lower altitude, no air should pass through hoses.

Fig 1: Checking High Altitude Compensator System
G117734Courtesy of MAZDA MOTORS CORP.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.