Runs Rough During Deceleration/Backfire
F2-60flowchartF2 section = 1.8L K8-ZE V6 engine.
21 Runs Rough During Deceleration/Backfire
Description: Engine runs rough during deceleration, and abnormal combustion occurs in exhaust system. Transaxle in normal condition.
NOTE
[TROUBLESHOOTING HINTS] (1) Air/fuel mixture too rich: Air cleaner element clogged; Fuel injection control malfunction (Fuel-cut control); Fuel injector fuel leakage. (2) Throttle position sensor (terminal IDL) malfunction.
Runs Rough During Deceleration/Backfire (STEP 1–5)
1
STEP 2: Does Self-Diagnosis Checker Monitor Light show that switches operate correctly with ignition switch ON? (page F2-92)
No
Light not turn ON or OFF with specified switch: Check for cause (Refer to specified check sequence) (page F2-93). Light always ON: Check wiring between ECM terminal 1D and Self-Diagnosis Checker
Light not turn ON or OFF with specified switch: Check for cause (Refer to specified check sequence) (page F2-93). Light always ON: Check wiring between ECM terminal 1D and Self-Diagnosis Checker
Yes
2
STEP 3: Is intake manifold vacuum correct at idle? Vacuum: More than 450 mmHg (17.7 inHg)
No
Check for air leakage of intake-air system components
Yes
3
STEP 4: Is air cleaner element clean? (page F2-70)
No
Replace air cleaner element
Yes
4
STEP 5: Are ECM terminal voltages OK (especially 2F, 3A, 3U, 3V, 3W, 3X, 3Y and 3Z)? (page F2-141)
No
5
Check for cause (page F2-141)