Sharing Topic : SCV (Suction Control Valve) All common rail engines use a suction control valve. The Suction Control Valve (SCV) is responsible for controlling fuel pressure in common rail engines. They move via a solenoid with each small incremental variation of the throttle. The Suction Control Valve uses extremely fine tolerances within their moving parts. These Suction Control Valve is quickly affected by the dirt and or contaminated fuel. When the suction control valve is contaminated or worn they will cause the common rail pump to deliver an inconsistent fuel pressure to what is being demanded by the factory ECU. When the fuel pressure at the injectors jumps around by many thousand of PSI the vehicle driver will experience surging as the ECU tries (and fails) to find the correct operating fuel pressure. This is seen diagnostically when viewed via live data. If the problem of varying pressure moves past a pre set limit of that which the manufacture states should be the normal range for a certain RPM the vehicle will go into limp mode. You can reset the normal operating condition by stopping and re-starting the engine. The problem will re-appear in a short while however. Fitting a Diesel Performance Module (Chip) will always exacerbate the problem. Many people incorrectly blame the Chip for this as the problem may be just under the surface without the Chip fitted. Cleaning and re-installed the Suction Control Valve rotated 90 degrees may fix the problem short term however, sooner or later the Suction Control Valve will need to be replaced.
Posted on: Mon, 29 Sep 2014 08:18:43 +0000
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