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Vehicle: 2004 Isuzu Rodeo 3.5L 100,000 miles. This engine only used in 2004. Variable valve Timing. DTC has thrown codes reflecting a problem with the VVT. Problem is somewhere between the Oil Control Valve and the VVT pulleys.
To assure a clean oil passages a 3k mile cycle was done using Mobile 1 0W-30 synthetic. Now running Castrol GTX 5W-30.
After driving (especially on interstate) when coming to first stop after getting off interstate the valve train rattles terribly. Once starting to drive the rattle/tapping type noise frequency increases until 2k rpm the it goes away completely. Not even a hint of noise. With hood up and noise being apparent it is not possible to tell if rattle/tapping is a under valve cover or the VVT pulley behind the timing cover. I am sure the problem is between the VVT pulley(s) and the Oil Control Valve.
Does that sound and circumstance seem to point to the VVT pulley making that rattling noise or would it be the Oil Control Valve? My Tech 2 is not working so I cannot follow the Isuzu trouble shooting and I am going to have to do a part replacement to fix.
With Pulleys at $115 each and the Oil Control Valves at $250 each I want to get opinion as to likely culprit.
Initially threw codes P1348 and P1350. I codes have not reappeared. I cant do a self diagnostic test as my Tech 2 is completely dead.
I have see the comments about the Oil Control Valves causing most of the problems. I am trying to wrap my head around how that component malfunctioning can cause the mechanical sound I am hearing. Sounds like the fron half of the lifters are completely dry is only way to describe the sound.