Forum Discussion
ernie1
May 02, 2022Explorer
At one time I also had a 1989 Ford E350 with 460 engine and FI. I also had the very same identical symptoms and the problem was the two(yes two) oxygen sensors had failed and the catalytic converter was glowing red while running hard and it was plugged up. All of this heat caused the AC high side hose to pop loose and the propane tank pressure relief valve to periodically let loose with a long violent whoosh! Along with not having much power for the engine, I was getting 4 1/2 mpg. Oh, also, the fastest the vehicle could go was 45 mph.
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