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W163 400 cdi acceleration problem

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Old 03-07-2017, 04:02 AM
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W163 400 cdi acceleration problem
Hello , I have ML w163 400 cdi . The ECU was changed . During normal acceleration no problems , after hard acceleration the engine shut off and light up EPC on the dashboard . On diagnostic come fault P2021 check Y74 (pressure regulation valve . The valve was changed with new one . The fuse,relays, fuel pumps , fuel filter are checked and all it's ok .
Can anyone help me to solve the problem ?
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Old 03-07-2017, 04:26 PM
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Was the ECU the same part number??
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Old 03-08-2017, 04:25 AM
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Yes and the engine work normal unless during hard acceleration
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