Problem Description and Possible Solution
The variable valve timing camshaft actuators may stick due to dirty engine oil or a faulty control solenoid. A sticking actuator may cause a rough idle and the Check Engine Light to illuminate. Our technicians tell us the engine oil should be checked to make sure it is clean and at the proper level before replacing any parts to correct this concern.
Average mileage: 134,200 (69,700–217,700)
Engine affected: 4.2L 6 Cylinder
16 people reported this problem
had low oil pressure light & chk engine light on and oil gauge dropping to zero - replaced variable timing camshaft and initially did not fix problem.. went to 3 mechanics who had no clue but all lights eventually went out and oil gauge normal. still starts rough and has code although not tripping check engine light
rough start, slight vibration, slow take off low oil pressure flashes on dash, changed oil which was about 4qts low and oil was dirty....used high mileage oil & better brand,.....about 148,000 mi now.....will go through several crank cycles to what happens..... vibration is gone, CEL is off, improved take off, still has slightly rough start..... next will be to change vvt and cam shaft position sensor..stayed tuned