Engine Hesitation is caused by inacurrate engine timing, no Idle-up signal, abnormal fuel or faulty fuel sensor & actuator. The purpose of "Basic Inspection" is to check engine timing, Idle-up siganl, fuel condition and sensor & actuator.
Engine "ON" and warm up the engine until cooling fan is operated.
Connect a scantool to Data Link Connector(DLC).
Check current data.
Specification :
Normal condition of the timing belt : CMP fall edge : 38 teeth, CMP rise edge : 98 Teeth
- Small tension of the timing belt - Around 1 tooth is difference from normal condition.
- Large tension of the timing belt - Around 3 teeth is difference from normal condition.
Abonormal condition of the timing belt
- Jumping 1tooth across timing mark - Around 5 ~6 teeth is difference from normal condition.
Are current data of the "CMP FALL EDGE / CMP RISE EDGE " OK?
YES
Go to "fuel Inspection" procedure.
NO
Replace timing belt and reassemble engine timing system.
Engine "ON" and warm up the engine untill cooling fan is operated.
Connect a scanner to Data Link Connector(DLC).
Check current data after turn air conditioner on and select D range with shift lever.
Specification : refer to below current data.
This current data is nothing but an example at certain condition. Thus, the real current data and waveform could be different from this example.
When "Idle status of the current data" is normally displayed "ON"
Go to "Fuel Inspection" procedure.
When "Idle status of the current data" is not displayed "ON"
Check Input signal(to ECM) such as A/con switch, "D" range switch and repair as necessary.
IG "OFF"
Remove the fuel pump and inspect the fuel condition.
Is the fuel normal?
YES
Go to "Sensor and actuator inspection" procedure.
NO
Replace the fuel.
■ Characteristic of abnormal gasoline
1) Toxic odor
2) Eyes stung
3) Hard vaporizing
4) Knocking suddenly after fuelling up
5) Hard starting after fuelling up(In the winter)
■ Influence of abnormal gasoline
1) Knocking
2) Excessive fuel consumption
3) Poor power/acceleration
4) Fuel system damage such as fuel pump, Injector and component of the combustion-camber damage (piston etc...)
5) Deposit rising or corrosion (in the engine and fuel system)
6) Fuel pressure decrease or Engine stalling by vapor lock.
7) Impossible starting by low volatile
8) Discharge carcinogen
9) Discharge pollutant(CO, HC, NOx etc...)
