Some can argue that there are not enough threads in the head for the spark plug to grab on to. It is still a bit of a mystery of why this happens in the first place. That is what Ford technicians do advise to this day, despite the cost involved. Prior to this, the only viable solution was to actually replace the head altogether. The problem was so common that numerous aftermarket specialists did, in fact, provide tools and solutions to drill, retap, and rethread the spark plug hole in the head. Interestingly enough, blowing out usually happens on the passenger side with the spark plugs on the third and fourth cylinder. 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. Having all these parts working correctly is crucial as all of them affect moving parts of the engine and, more or less, keep the engine from tearing itself apart. VVT hasn’t been installed in older 2 valve motors. Bear in mind that cam phasers are part of the Variable Valve Timing system which is an important component of the 5.4 Triton engine with 3 valves per cylinder. While causes for such sounds can be numerous, owner experiences have shown that the most likely reasons can be blown out tensioners, a loose timing chain, and cam phaser breakage. The engine sounds strange? You can hear a lot of knocking noises on acceleration, cold startup, or when you let off the throttle.
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