Terracan (HP)/poor acceleration-water pump

model: Terracan (HP)	Year model: 2004	mileage: 30500 km
Displacement: 2900cc	Fuel: Gasoline	T/A All

Subject: poor acceleration- water pump

1) C0ndition:

• Poor acceleration with a warm Engine.

2) Cause:

• Coolant temperature increases due to the water pump malfunction.

3) Diagnosis:

1. Scan tool check= no trouble code.
2. At idle , the condenser fan operates highly with A/C off.
   At this point the current data shows WTS 117 *C.
   (Water Temperature Sensor)
3. During acceleration the RPM is fixed 1,800.
4. After the A/C ON condition, When the engine is cooled, accelerating become possible.
5. with coolant temperature increasing,decrease the amount of fuel to protect the engine,computer logic, if water temperature sensor becomes 120*c, the engine can be stalled.
6. While checking the water pump the impeller is separated.

4) Repair Guide:

1. Replace the water pump and coolant.
2. Clean the coolant passages.  
3. more