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Home >> GMC >> 1982 >> Magnavan Automatic Trans, Trans Mfr CD 400/M40 >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Fuel System >> ROCHESTER Models M4MC & M4ME 4-Barrel >> Adjustment >> Fast Idle Adjustment (Bench Setting)

Fast Idle Adjustment (Bench Setting)

NOTE: This is a preliminary adjustment only. It is required to ensure that other adjustments are made with fast idle speed approximately correct. Final Cold (Fast) Idle Speed adjustment must be made with carburetor installed and engine running. See appropriate article in TUNE-UP SERVICE PROCEDURES.
  1. Place fast idle speed cam follower on high step of fast idle cam. Back off fast idle speed screw until screw moves away from cam follower.
  2. Turn screw in until it contacts lever. Turn screw in an additional 3 turns.
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