Well my 1998 Explorer XLT with the 4.0 SOHC finally blew the timing chain today. Rear passenger side chain has always rattled, but the noise is coming from the front drivers side. Engine has been extremely sluggish today after filling up with regular gas (usually run mid grade or premium). First I'd floor it and cars would still pass me from a dead stop. Basically lost ALL low end torque. Then engine just dies out of nowhere driving down the highway and free spins with no compression when I try to start it. Should I have this engine repaired, get another 4.0 SOHC, or just get a 5.0 and drop it in since the 5.0 was an option. I'm thinking 5.0 so there won't be anymore timing chain problems, but with all these computers these days, I'm guessing it won't be a simple drop in and go. What should I do? I do have a cherry picker & engine stand so I can bypass auto shop prices, unless there's problems I can't handle.
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