Re: Blocked cat / exhaust overheat engine and increase consumption?
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It does sound like the symptoms of a blocked exhaust. It may be the cat has collapsed and the guts have found their way back to the muffler and have jammed.
Give it a good long rap through the gears out on the freeway where you can safely take it up to say 120 a few of times from a standing start. On the second or third run (after you've got some heat through the system) if you see a heap of sheeeet billowing out your exhaust it indicates bits of dead cat being expelled. If you're lucky it will all be cleared out and you can continue driving for years even before you may have to actually replace the cat. But if the heat continues and fuel consumption doesn't stabilize then the cat/exhaust blockage will have to be addressed.
However, there are other things it could also be such as blocked radiator, slipping clutches in the auto, lock-up clutch in torque convertor; just to name a few.
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