#### ADJUSTMENTS

##### Throttle Linkage

1. Disconnect the negative battery cable.
2. Remove the air cleaner.
3. Open the automatic choke valve by hand, while turning the throttle valve by pulling the throttle lever, then set the choke valve in the open position.

   NOTE: If equipped with a vacuum controlled throttle positioner, use a vacuum hand pump to retract the throttle positioner rod.

4. Adjust the throttle cable at the carburetor bracket, so that a 1.0–2.0mm of free pedal play exists.

##### Dashpot

A dashpot is used on carburetors with automatic transaxles and some manual transaxles. The dashpot slowly closes the throttle on automatic transmissions to prevent stalling and serves as an emission control device on all late model vehicles.

The dashpot should be adjusted to contact the throttle lever on deceleration at approximately 1,400–1,600 rpm of engine operation.

Fig. 1: Dashpot adjustment

NOTE: Before attempting to adjust the dashpot, make sure the idle speed, timing and mixture adjustments are correct.

1. Loosen the lock-nut (turn the dashpot, if necessary) and make sure the engine speed drops smoothly from 2,000 rpm to 1,000 rpm in 3 seconds.
2. If the dashpot has been removed from the carburetor, it must be adjusted when installed. Adjust the gap between the primary throttle valve and the inner carburetor wall, when the dashpot stem comes in contact with the throttle arm. The dashpot gap is 0.66–0.86mm (manual transaxle) or 0.49–0.69mm (automatic transaxle).

##### Secondary Throttle Linkage

All carburetors discussed in this book are two stage type carburetors. On this type of carburetor, the engine runs on the primary barrel most of the time, with the secondary barrel being used for acceleration purposes. When the throttle valve on the primary side opens to an angle of approximately 50°(from its fully closed position), the secondary throttle valve is pulled open by the connecting linkage. The 50°angle of throttle valve opening works out to a clearance measurement of 7.4–8.4mm (Stanza) between the throttle valve and the carburetor body. The easiest way to measure this is to use a drill bit. Drill bits from sizes H to P (standard letter size drill bits) should fit. Check the appendix in the back of the book for the exact size of the various drill bits. If an adjustment is necessary, bend the connecting link between the two linkage assemblies.

Fig. 2: Secondary throttle linkage adjustment

##### Float Level

The fuel level is normal if it is within the lines on the window glass of the float chamber (or the sight glass) when the vehicle is resting on level ground and the engine is off.

If the fuel level is outside the lines, remove the float housing cover. Have an absorbent cloth under the cover to catch the fuel from the fuel bowl. Adjust the float level by bending the needle seat on the float.

Fig. 3: Float level adjustment

The needle valve should have an effective stroke of about 1.5mm. When necessary, the needle valve stroke can be adjusted by bending the float stopper.

NOTE: Be careful not to bend the needle valve rod when installing the float and baffle plate, if removed.

##### Fast Idle

NOTE: On the Stanza models, the fast idle cam lever is located next to the fast idle cam screw, so the choke cover does not have to be removed. On the 1985 Stanza, disconnect the Fast Idle Breaker harness at the carburetor.

1. Remove the carburetor from the vehicle. Refer to the necessary service procedures in this section.

   CAUTION
   Never smoke when working around gasoline! Avoid all sources of sparks or ignition. Gasoline vapors are EXTREMELY volatile!

2. Remove the choke cover, then place the fast idle arm on the 2nd step of the fast idle cam. Using the correct wire gauge, measure the clearance A between the throttle valve and the wall of the throttle valve chamber (at the center of the throttle valve). It should be 0.66–0.80mm (MT) or 0.81–0.95mm (AT).

   NOTE: The first step of the fast idle adjustment procedure is not absolutely necessary.

3. Install the carburetor on the engine.

   Fig. 4: Adjusting the fast idle cam — Stanza

4. Start the engine, warm it to operating temperatures and check the fast idle rpm. The cam should be at the 2nd step. Engine speed should be 2,400–2,700 rpm (MT) or 2,800–3,100 rpm (AT).
5. To adjust the fast idle speed, turn the fast idle adjusting screw counterclockwise to increase the fast idle speed and clockwise to decrease the fast idle speed.

##### Fast Idle Breaker

###### 1985–86 STANZA

1. Start the engine and warm it to operating temperatures without racing it.
2. Check the engine speed and the breaker operation, it should be high revolution at the start, then idle speed when warm.
3. Disconnect the fast idle breaker harness connector at the carburetor. Using an ohmmeter, check the fast idle breaker for continuity; place one lead on the breaker's ground wire and the other lead on the No. 8 pin of the harness connector.

   Fig. 5: Checking the continuity of the fast idle breaker — Stanza 1985 and later models

   NOTE: Checking is performed when the breaker is cold (less than 68°F) and the choke plate closed.

4. If there is no continuity, replace the breaker.
5. If an ohmmeter is not available, check the breaker with the engine running (harness connector installed), if the breaker does not warm up, replace it.

##### Cam Follow Lever

###### STANZA

Hold the choke plate closed, turn the adjusting screw until there is no clearance between the cam follow lever and the fast idle cam.

Fig. 6: Adjusting the cam follow lever — Stanza

##### Automatic Choke

1. With the engine cold, make sure the choke is fully closed (press the accelerator pedal all the way to the floor and release).
2. Check the choke linkage for binding. The choke plate should be easily opened and closed with your finger. If the choke sticks or binds, it can usually be freed with a liberal application of a carburetor cleaner made for the purpose. A couple of quick squirts normally does the trick; if not, the carburetor will have to be disassembled for repairs.
3. The choke is correctly adjusted when the index mark on the choke housing (notch) aligns with the center mark on the carburetor body. If the setting is incorrect, loosen the three screws clamping the choke body in place and rotate the choke cover left or right until the marks align. Tighten the screws carefully to avoid cracking the housing.

##### Choke Unloader

NOTE: The choke assembly must be cold for this adjustment.

1. Close the choke valve completely.
2. Hold the choke valve closed by stretching a rubber band between the choke piston lever and a stationary part of the carburetor.
3. Open the throttle lever fully.

   NOTE: On the Stanza, the unloader adjusting lever is connected to the primary throttle plate shaft, an intermediate cam is connected to the choke lever by a choke rod.

4. Adjustment is made by bending the unloader tongue. Gauge the gap between the choke plate and the carburetor body to 2.05–2.85mm.

##### Vacuum Break

1. With the engine cold, close the choke completely.
2. Pull the vacuum break stem straight up as far as it will go.
3. Check the clearance between the choke plate and the carburetor wall. Clearance should be 3.12–3.72mm above 68°F; 1.65–2.25mm below 41°F.
4. On the Stanza models, adjustment is made by bending the tang at the choke plate lever assembly.

   NOTE: Remove the choke cover, then connect a rubber band to the choke lever to hold it shut.

   Fig. 7: Vacuum break adjustment

##### Accelerator Pump

If a smooth constant stream of fuel is not injected into the carburetor bore when the throttle is opened, the accelerator pump needs adjustment.

The Stanza accelerator pump is of a different design and is not adjustable; if it is not operating correctly, replace it.

##### Anti-Dieseling Solenoid

Check this valve if the engine continues to run after the key has been turned off.

1. Run the engine at idle speed and disconnect the lead wire at the anti-dieseling solenoid. The engine should stop.
2. If the engine does not stop, check the harness for current at the solenoid. If current is present, replace the solenoid. Installation torque for the solenoid is 13–25 ft. lbs. for CA20 engines.