Tune - Up Checks - Carburator Fuel and Electrical System and Ignition Timing

4. CHECK IDLE SPEED - air filter installed.
A. 750 RPM - M/T in Neutral 700 RPM - A/T in "D"



5.. FLOAT LEVEL - check at idle in Neutral.
A. Clearance between float and air horn (without gasket): 11.5 mm



GLC

4. CHECK IDLE SPEED - air filter installed.
A. 850 RPM - M/T in Neutral 750 RPM - A/T in "D"



5. FLOAT LEVEL - check at idle in Neutral.
A. Clearance between float and air horn (without gasket): 7.3 mm



626

6. CHECK TIMING - use white mark on pulley.
A. 6~ BTDC - M/T In Neutral 6~ BTDC - A/T In "D"
B. If timing was adjusted, recheck idle speed.



7. IDLE MIXTURE (626) - check at idle.
A. M/T In Neutral A/T In "D"
B. Connect the positive lead of a dwell meter to the BrY service connector of the Air/Fuel solenoid. Ground the negative meter lead.
C. Set the dwell meter to a 90~ scale and a 4-cylinder setting.
D. If the meter reading fluctuates several degrees, the idle mixture is correct. Go to Step 8.
E. If the meter reading does not fluctuate, check the fuel control system using System '83 Fuel Control Check Procedures. After repairs, go to Step 8.



GLC

6. CHECK TIMING - yellow mark on pulley.
A. 6~ BTDC - M/T in Neutral 6~ BTDC - A/T in "D"
B. If timing was adjusted, recheck idle speed.



7. IDLE MIXTURE (GLC) - check at idle.
A. M/T In Neutral A/T in "D"
B. Connect the positive lead of a dwell meter to the service connector of the Air/Fuel solenoid. Ground the negative meter lead.
C. Set the dwell meter to a 90~ scale and a 4-cylinder setting.
D. If the meter reading fluctuates several degrees, the idle mixture is correct. Go to Step 8.
E. If the meter reading does not fluctuate, check the fuel control system using System '83 Fuel Control Check Procedures. After repairs, go to Step 8.



626

8. CHECK DASHPOT - in Neutral.
A. Dashpot rod must separate from throttle lever at 2000 + 100 RPM.



9. CHECK IDLE SWITCH (626) - in Neutral.
A. Connect the positive lead of a voltmeter to the LgR terminal of the idle switch. Ground the negative lead.
B. Raise engine speed to 2000 RPM, then slowly decrease engine speed.

C. Between 1300-1200 RPM the voltmeter reading should increase from less than 1.5V to about 12V.



GLC

8. CHECK IDLE SWITCH - in Neutral.
A. Connect the positive lead of a voltmeter to the BrR wire at the idle switch connector. Ground the negative lead.
B. Raise engine speed to 2000 RPM.

C. While slowly decreasing the rpm note the voltmeter reading:

M/T - Between 1100-1000 rpm the voltmeter reading should increase from less than 1.5V to 12V.

A/T - Between 1300-1200 rpm the voltmeter reading should increase from less than 1.5V to 12V.



626

10. A/C SERVO DIAPHRAGM - Check at idle in Neutral.
A. Use a jumper to ground the Br wire on the yellow connector.
B. Engine speed should increase to 1300 +/- 100 RPM.



GLC

9. THROTTLE POSITIONER - Check at idle in Neutral.
A. Disconnect the Br connector from the solenoid on the firewall.
B. Engine speed should increase to 1200 +/- 100 RPM.



11. P/S SERVO DIAPHRAGM (626) - check at idle in Neutral
A. Use a jumper to ground the GR wire on the green connector.
B. Engine speed should increase to:
900 +/- 100 RPM - M/T 1150 +/- 100 RPM - A/T
If a drivability problem still exists after performing the tune-up procedures, go to Step 3 of the System '83 Fuel Control Check Procedures.