On the other hand, if more power is needed, the cam phaser will move the camshaft affecting the position of the cam lobes and, of course, the speed and timing of the valve opening. At lower RPMs, for example, it is optimal to save as much fuel as possible so the cam will be in one position. In short, cam phasers will move the camshaft a few degrees to one side or the other, thus affecting the cam lobes’ ability to open and close valves. This technology is created to provide certain advantages which benefit both fuel efficiency and maximum HP values.
Use specialized tools optimized to remove plugs from the engine.Įngines with Variable Valve Timing (VVT) have numerous additional pieces which make possible slight timing adjustments to valve opening and closing operations on a running engine. Do not use air or power tools to remove plugs, use hand tools only,. Do not try to remove the plugs from a warm or hot engine,. Thus, a full engine inspection should be performed. This can lead to premature camshaft lobe wear, more stress on the cam phasers and, in the worst case, physical contact between pistons valves and other metal pieces. If some of the most important supporting pieces of the timing chain have been damaged, we should infer that the ignition and camshafts timing isn’t in accordance with the factory setting. Plastic pieces, on the other hand, can fall to the oil pan and partially block the oil’s path. No reason to tell you that this can damage the timing chain further. These plastic pieces can become fully detached from metal surfaces over time thus enabling metal-to-metal contact of the timing chain and metal carriers guides were attached to. 
The loosened timing chain will rattle like mad and damage plastic timing chain guides. In this case, the domino effect is more than likely. If you can hear rattles, the timing chain may have become loose due to the blown out tensioner. So, listen carefully for any unusual rattles after a cold start. Timing chain rattles are most noticeable at the very start.
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