2002 FORD ESCORT 2.0 SPI ENGINE FRAG
The Ford 2.0 single overhead camshaft engine is a real piece of work. It has an inherent flaw that results in the entire engine having to be scrapped: the valve seats come loose. Yes, yes, I know. That doesn't seem possible since no engine would work with that problem as they all have valve seats, and yet here we are discussing it. There are many articles online about this particular problem but there are no real solutions. Perhaps the only viable solution I personally have come across is 1. changing out the cylinder head with one that has reinforced valve seats. Any other solution, and I have seen some crazy ones, will lead to the engine totally destroying itself as it eats bits and pieces of valve seat. This also happens to be the cheapest route to fixing these engines, assuming of course that yours hasn't already fragged.
One other solution, one that is a bit more extreme, is to 2. change out the SPI engine with the DOHC engine of the same size. Since Ford makes two engines for this same car, including the Focus, it is possible to change out the engines as long as you get a few things from the DOHC car. A new air intake box is needed, a new exhaust pipe, possibly a new automatic transmission (although many have just bolted the existing one on) and the wiring which includes a new computer. This will result in a complete and noticeable change and will give you a more powerful engine with the same gas mileage, if you care about that sort of thing. Personally I care more about my engine totally destroying itself and leaving me stranded than MPG. But that's just me.
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