Does Engine Stalling When You Accelerate?

Model: Hyundai Santa Fe
Tear Model: 2002
Mileage: 126345km
Displacement: 2000cc
Fuel : Diesel
T/A : All
Subject: Engine Stalling When Accelerating in Cold Condition – Fuel Tube
1) Condition

1. Engine Stalling in Cold Condition When Accelerating Suddenly.
   = Normal In Idling Condition.
   = Engine stalls more frequently in cold condition than in heat condition.
2. Engine stalls intermittently when driving in heating condition.
   = Normal in idling condition, but the engine stalls when driving on hilly road or decelerating suddenly.

2) Cause

1. Due to the fluctuation of low pressure tube, the fuel is not supplied enough so the engine stalls when accelerating.

3) Diagnosis

1. Scan tool check.
   = Diagnostic trouble code( P1181 = Fuel pressure monitoring fail.
   = Current data = Normal in cold and idling condition.(WGT).
   = The fuel pressure control valve increases abnormally when accelerating the engine suddenly.
2. Inspect the rail pressure(from low pressure to high pressure).
   = Check the pressure after stalling the fuel pressure gauge to low pressure line( The line between the low pressure pump and fuel filter)
   = The pressure is measured by 2.8 in idling condition.
   ( STANDARD VALUE 2.5~2.8 bar)
   = The pressure after installing the fuel pressure gauge between the filter and high pressure pump.
   = Normal pressure in idling condition.
   = The fuel pressure decreases rapidly when decelerating after the fuel pressure gauge is installed.
3. Inspect the fuel filter.
   = Drain the water from the fuel filter.
   = Check if there are remains in fuel filter after discharging the fuel.
4. Check the line from fuel filter to high pressure pump.
   = The tube near by fuel filter has been damaged.

4) Repair Guides

1. P1181 (C010) is related to fuel pressure. This is a basis of diagnosis.
2. Damage of tube may be occurred when producing the tube.
   The engine stalls in cold condition frequently because the fuel tube is contracted  in cold condition more than in heating condition. Therefore the fuel is not supplied enough to high pressure pump. Compared with this, in heating condition, the amount of contraction is small so the problem is not occurred.
3. If the fuel pressure malfunction is suspected, inspect the fuel pressure data and fuel pressure regulator  data in G- Scan with below condition.
4. P1181 (C010) fuel pressure monitoring fail ( fuel pressure high idle ) code
   = this code is displayed when abnormal fuel pressure is detected.

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