Mitsubishi Montero (1991+). Manual — part 235

that all of the engine control systems are operating as they were

designed to. Therefore, they are not the cause of the driveability

problem.

The following additional items can not be overlooked as possible

causes of a driveability problem.

1. THROTTLE VALVE AREA - Dirt or ice buildup causing rough idle and

stalling.

2. ENGINE IGNITION TIMING - Must be set with timing terminal

grounded.

3. ENGINE VACUUM - Must be normal for your altitude.

4. ENGINE VALVE TIMING - To specifications.

5. ENGINE COMPRESSION - To specifications.

6. ENGINE P.C.V. SYSTEM - Must flow freely.

7. ENGINE EXHAUST SYSTEM - Must be free of any restrictions.

8. POWER BRAKE BOOSTER - No internal vacuum leaks.

9. TORQUE CONVERTER CONDITION - May cause very low power at breakaway

or high speed (Only 1 condition at a time).

10. FUEL CONTAMINATION - High alcohol or water content.

11. FUEL INJECTORS - Rough idle may be caused by injector wiring not

connected to correct injector.

12. ENGINE SECONDARY IGNITION CHECK - Abnormal scope patterns.

13. TECHNICAL SERVICE BULLETINS - Any that apply to vehicle.

14. All air intake piping and vacuum hoses must be in place and

secure. The proper air filter element must be used.

15. FUEL PRESSURE - Must be correct.

Specification: With no vacuum at the regulator:

48 PSI on V6 & non-turbo 4 Cyl. engines

36 PSI on turbo engines

NS-1: TESTING IGNITION CIRCUIT - 1.6L

Fig. 75: Circuit Diagram NS-1 (1.6L)

Fig. 76: Flow Chart NS-1 (1.6L)

Fig. 77: Circuit Diagram NS-1 (1.6L)

Fig. 78: Flow Chart NS-1 (1.6L) (1 of 4)

Fig. 79: Flow Chart NS-1 (1.6L) (2 of 4)