Pages 7–10 (4 pages)

Idle System

From the 1973 Rochester 4M Quadrajet Carburetor Illustrations (Section 4M)

Year
1973
Make
Rochester
Vehicle
Carburetors, Components and Systems
Type
Service Manual
Models
Rochester 4M Quadrajet four-barrel carburetor (general, not by vehicle)
Pages
51

Idle circuit diagrams showing the idle tube, idle air bleeds, off-idle air adjustment screw, idle mixture needle and limiter caps, idle discharge hole and off-idle port. They also cover the idle compensator valve with its bi-metal strip, timed canister purge ports, the EGR valve tube and channels, and a figure of Quadrajet idle compensator locations A, B and C (4M-16).

What this section covers

  • Idle tube, air bleeds and by-pass
  • Idle mixture needles and limiter caps
  • Off-idle port and discharge hole
  • Hot idle compensator valve
  • Canister purge ports
  • EGR valve passages
  • Idle compensator locations
Read from page 7
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