ENGINE GENERAL INFORMATION AND DIAGNOSIS (TBI FOR G10) 6-71
1. Throttle body
2. Fuel feed hose
Good
No good
1. Injector connector
STEP ACTION YES NO
6 Check PCV valve for clogging (See Section 6E1).
Is it in good condition?
Go to Step 7. Replace PCV valve.
7 Check EVAP Canister Purge Valve for Closing.
1) Disconnect purge hose (1) from EVAP canister.
2) Place finger against the end of disconnected hose.
3) Check that vacuum is not felt there, when engine is
cool and running at idle. See Fig. 5.
Is vacuum felt?
Check EVAP
control system
(See Section 6E1).
Go to Step 8.
8 Check intake manifold pressure sensor for performance
(See Section 6E1).
Is it in good condition?
Go to Step 9. Repair or replace.
9 Check engine coolant temp. sensor for performance
(See Section 6E1).
Is it in good condition?
Go to Step 10. Replace engine
coolant temp.
sensor.
10 Check parts or system which can cause engine rough
idle or poor performance.
– Engine compression (See Section 6A).
– Valve lash (See Section 6A).
– Valve timing (Timing belt installation. See Section 6A).
Are they in good condition?
Check wire harness
and connection of
ECM (PCM) ground,
ignition system and
fuel injector for
intermittent open
and short.
Repair or replace.
Fig. 1 for Step 3 Fig. 2 for Step 3 Fig. 3 for Step 4
Fig. 4 for Step 5 Fig. 5 for Step 7