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.

1981 Plymouth Sapporo Automatic TransFACTORY OEM SERVICE PROCEDURE

Throttle Opener Operating Speed

Connect tachometer to engine and warm engine to normal operating temperature. Set engine idle speed to specifications. Turn air conditioner and accessories off. On front-wheel drive models, disconnect engine cooling fan.
Activate throttle opener (air conditioning "ON") and adjust throttle opener speed to specified RPM shown in table by turning throttle opener adjusting screw. See Fig 1.

With throttle opener speed set to specifications, turn air conditioner "OFF" and recheck idle speed. Normal engine idle speed should not be affected when throttle opener is not activated.

Throttle Opener Specifications

Application		Operating Speed (RPM)
1400 cc Engine		1050-1150
1600 cc Engine
	Man. Trans.	1050-1150
	Auto. Trans.	1100-1200
2000 cc Engine		950-1050
2600 cc Engine		1000-1100

Fig 1: Throttle Opener System

Courtesy of CHRYSLER GROUP, LLC

Factory Service Tools

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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.

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