Ford CSG-850 / WSG-858 — Idle Adjustment
Adjustments · Carburetor idle system
For the Ford CSG-850 / WSG-858, from the Ford service manual.
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Procedure
- Connect a tachometer with 1% to 2% accuracy and 0-1000 rpm expanded scale.
- Adjust idle mixture screws fully in lightly seated; back them out 1 1/2 revolutions.
- Warm the engine thoroughly; adjust curb idle speed with the throttle stop screw.
- Turn mixture screws inward until lean drop, then outward until rich drop.
- Turn screws inward to a point between the extremes for maximum smoothness and rpm.
- Reset idle speed to specifications.
- Recheck idle mixture adjustment and reset if necessary.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Curb idle rpm 550-575; premilinary mixture setting 1 1/2 turns
Source: Ford service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.