Idle/Altitude Compensator (Non Comp. Controlled): Testing and Inspection

Electrical
1. Check and record engine timing.
2. Disconnect compensator from ignition module and connect suitable jumper wire across module connectors. Recheck engine timing.
3. At altitudes of 3000 ft. or lower, timing should change as follows: Ford & Mercury full size models, with V8-302, advance 6°; all other models, advance 8°.
4. At altitudes of 4000 ft. or higher, there should be no change in timing.

Fig. 8 Mechanical type altitude compensator:

Mechanical
1. Connect a suitable vacuum gauge to air inlet nipple, Fig. 8, and check for vacuum with engine running.
2. On 4-140 engine, there should be no vacuum at altitudes of 2500 ft. or lower and vacuum should be present at altitudes of 3000 ft. or higher.
3. On 4-97 and V6-232 engines, there should be not vacuum at altitudes of 3500 ft. or lower and vacuum should be present at altitudes of 4000 ft. or higher.