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Trying to sort a similar issue with a 1.8 VVT petrol. If VVt solenoids fail , loss of oil pressure to certain parts of engine , and no VVT action so loss of power. VVT failure most likely causes ECU to go into Limp mode .
 

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So turns out Cruze Diesel ( not sure Petrol yet ) Have variable Volume Oil Pump. Not sure if ECU controlled at this Point . Either way a Recipe for disaster altering Oil Pump Output ( TO save Fuel) So this would explain all the Oil Pressure Problems and bottom end knocking . Only takes 3Psi to turn oil pressure light off. ( As it really means , turn engine off NOW!!!) Feel free to search and share anything you can find about this Oil Pump ( mostly on US sites ) I intend to hook up old school oil pressure Gauge and check pressure and search for Control Valve to assess what can fail. Oil pump is located behind Main pulley on crankshaft and behind gear that drives Timing belt , driven directly off Crankshaft . So no quick fix . Good luck finding any info you can.
 
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