help needed 311 cdi - Mercedes-Benz Forum

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post #1 of 1 (permalink) Old 03-27-2011, 08:52 AM Thread Starter
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Date registered: Mar 2011
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help needed 311 cdi

Hi, needing some advice on my 311 cdi. have just had it plugged in as its been running rough and the air intake pressure reading is very eratic and is jumping all over the place. Also it is fitted with the variable nozzle type turbo and the actuator is operating at idle. If i remove the pressure sensor and suck the end of it the actuator opens. Have replaced boost solenoid already and checked all the vac pipes, its as if its being sent the wrong signal. The van is lumpy on idle and when you acceleraate away it hesitates you get a popping noise a puff of smoke and then its off like hell. As i said no actual faults on the reader and all other pressures are ok. Have tried all the usual suspects and running out of ideas, any help much appreciated. Thanks Derek
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