Cold Dr-13 - Idle Rpm Check
- Turn all lights and accessories off. Place transmission in Neutral. Set parking brake. Start and run engine until normal operating temperature is reached. Ground the carburetor switch with a jumper lead. Disconnect and plug vacuum hose to the EGR valve.
- Disconnect and plug 3/16" vacuum hose from vapor canister. Remove PCV valve from valve cover and allow it to draw outside air. On 2-Bbl. models, disconnect and plug vacuum hose from the computer. Disconnect the carburetor 4-pin connector and remove the Green wire to the O2 solenoid from the connector.
- Reconnect the 4-pin connector. Start and run engine for 4 minutes before proceeding. On 4-Bbl. models, connect a voltmeter to the O2 solenoid (Green wire) and ground. Disconnect and ground wire from the O2 sensor using a jumper lead. Start engine and let idle until voltmeter reading is a steady 7-13 volts. This may take up to 4 minutes.
- On all engines, tachometer reading should be within specifications shown on emissions label. Set idle RPM to specifications as necessary. Tee in propane supply into heated air temperature sensor vacuum hose. Open propane valve and meter in propane until maximum RPM is obtained. Engine speed should increase 60 RPM (2-Bbl. models) or 50 RPM (4-Bbl. models) +/- 50 RPM.
- Open throttle and position fast idle adjusting screw on 2nd highest step of the fast idle cam. Fast idle speed should be set to specifications +/- 100 RPM. See FAST IDLE SPEED table. Adjust fast idle speed to specifications as necessary.
FAST IDLE SPEED
| Carb. No. | Specification |
|---|---|
| 4306441 | 1700 |
| 4306433 | 1450 |