Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
SYS.OK|MANUAL.DB● LIVE
HOMESERVICE MANUALSCHEVROLET1987FORWARD CONTROL 4.8 T, AUTOMATIC, 400/M40REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCEADJUSTMENTTUNE-UP - 6-CYLADJUSTMENTSIDLE MIXTUREIDLE MIXTURE PLUG REMOVAL
1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40
Idle Mixture Plug Removal
1987 Chevrolet Forward Control 4.8 T, Automatic, 400/M40SECTION Idle Mixture Plug Removal
- Remove carburetor from engine. Invert carburetor and drain fuel. Place carburetor in holding fixture with manifold side facing up.
- Use a hacksaw to cut 2 parallel cuts in the throttle body, one on each side of the locator point below idle mixture screw plug. Distance between cuts depends on size of punch to be used. Cut down to the steel plug and no more. Place a flat punch at a point near the ends of the saw marks.
- Hold punch at a 45 degree angle and drive into the throttle body until casting breaks away, exposing the steel plug. Hold a center punch vertically and drive it into the plug. Hold the punch at a 45 degree angle and drive the plug out of the casting.
RENDER: 1.0x
NO RELATED
Recommended Tools & Savings
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
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.