Re: Merc C220 fault code P1187 pressure deviation Archived Message
Posted by Alan Kane on January 21, 2009, 6:31 pm, in reply to "Merc C220 fault code P1187 pressure deviation"
Hi Paul, Your first code can only set if the rail pressure is 250bar below what is specified. Your second code can only set if the rail pressure is greater than 1450bar and engine speed is greater than 660rpm. The ECU is trying to control the pressure and failing. You have already proven the supply. That has to be reg or pump. Pretend you are a dealer and fit both Whats the idle like? If it rough or with any misfire check smooth running values. You could check return but if its only playing up under load that’s not much good to you. PS Good first post BTW
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