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 MANUALSMERCURY1982CAPRI L6-200 3.3LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMDISTRIBUTORDISTRIBUTOR VACUUM CONTROLTESTING AND INSPECTIONDISTRIBUTOR VACUUM CONTROL VALVE
1982 Mercury Capri L6-200 3.3L
Distributor Vacuum Control Valve
1982 Mercury Capri L6-200 3.3LSECTION Distributor Vacuum Control Valve
PROCEDURE
1. With engine at operating temperature and idle speed correctly set, connect a tachometer to the engine.
2. Remove cover from valve and slowly turn the adjusting screw counterclockwise without exerting any inward pressure. After five and no more than six turns, the idle speed should suddenly increase to approximately 1000 rpm.
NOTE: Any more than six turns out will release the compressed spring and washer.
3. If idle speed does not increase after the sixth turn, push inward on the end of the spring and release. Idle speed will increase.
4. After valve has been triggered to the higher rpm, slowly turn the adjusting screw clockwise until idle speed drops back down to proper level. Turn screw one additional turn clockwise.
5. Increase engine speed to 2000 rpm and hold for approximately five seconds then release throttle. The engine should return to idle within four seconds. If not, check return time with dashpot backed off so it does not contact the throttle lever.
6. If the engine still will not return to idle within four seconds, turn the adjusting screw clockwise in one-quarter turn increments until throttle return is satisfactory.
7. If throttle does not return after four one-quarter turn adjustments, the valve is defective and must be replaced.
NOTE: Application of the distributor vacuum control valve and the dual-diaphragm vacuum advance mechanism will vary from vehicle to vehicle.
1. With engine at operating temperature and idle speed correctly set, connect a tachometer to the engine.
2. Remove cover from valve and slowly turn the adjusting screw counterclockwise without exerting any inward pressure. After five and no more than six turns, the idle speed should suddenly increase to approximately 1000 rpm.
NOTE: Any more than six turns out will release the compressed spring and washer.
3. If idle speed does not increase after the sixth turn, push inward on the end of the spring and release. Idle speed will increase.
4. After valve has been triggered to the higher rpm, slowly turn the adjusting screw clockwise until idle speed drops back down to proper level. Turn screw one additional turn clockwise.
5. Increase engine speed to 2000 rpm and hold for approximately five seconds then release throttle. The engine should return to idle within four seconds. If not, check return time with dashpot backed off so it does not contact the throttle lever.
6. If the engine still will not return to idle within four seconds, turn the adjusting screw clockwise in one-quarter turn increments until throttle return is satisfactory.
7. If throttle does not return after four one-quarter turn adjustments, the valve is defective and must be replaced.
NOTE: Application of the distributor vacuum control valve and the dual-diaphragm vacuum advance mechanism will vary from vehicle to vehicle.
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.