Santa Fe Trouble Shooting Poor Engine Acceleration

model: Sonato EF 2.0 and Sonata NF 2.4 (2003 –2009)

fuel: Gasoline

Subject : POOR ENGINE ACCELERATION – CATALYTIC CONVERTER.

1) CONDITION:

1. Poor acceleration when Driving on common rail road. even on engine idling and give sudden acceleration.

2) CAUSE :

1. Catalytic converter is blocked.`

3) Diagnosis

1. Scan tool check.
   -No trouble code from G- Scan
2. Poor acceleration when accelerating suddenly by 3000 – 4000 rpm
3. Normal waveform of no. 1 TDC and CKPS.
4. Normal ignition plug and cable
5. Normal state of fuel.
6. After removing the exhaust manifold accelerating is normal.

4) Repair guide.

1. Cause of catalytic converter damage.
   -If the rich air/fuel mixture ratio is reached to catalytic converter,the catalytic is melted or cracked.it blocked the exhaust manifold and makes hard starting.
   -When driving to the road with water, the catalytic converter is damage due to the temperature difference between catalytic and water.
2. Malfunction of oxygen sensor.
3. Abnormal ignition coil and plug.
4. Fuel that is not ignited makes catalytic converter damaged when the engine stalls due to the abnormal power TR.
5. due to the impact of ‘muffler, the catalytic converter is damage.
6. When abnormal fuel is used for the long time.
7. When the ignition timing is not correct.
8. Displayed DTC when the catalytic converter is damaged.
   - P0420 Main catalyst efficiency Deterioration (bank 1)
   (If any codes related to oxygen sensor .MAFS,injector, a P0170 or a P0173 are present, do all repair associated with them before proceeding with this trouble area).
   - P0421 Main catalyst efficiency deterioration (Bank 1)
   ( If any codes related to oxygen sensor .MAFS, injectors, a P0171, a P0172 are present,do all repairs associated with them before proceeding with htis trouble.
   - P0430 Main catalyst efficiency Deterioration (Bank 2 )
   If any codes related to H02S sensor,MAFS,injector, a Po170 or a P0173 are present, do all repairs associated with them before proceeding with this trouble area.)

Exhaust manifold and catalytic coverter