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Question by nick: 1994 Jaguar xj12 w/107k miles has a loss of power and doesn’t want to accellerate, what might be the problem?
I know someone who is selling it for $ 1300. He says it was a trade in and doesn’t know whats wrong with it. would it be cheap to fix, or something i could do on my own? or should I not even bother?

Best answer:

Answer by jameson_221
Here are the symptoms of a bad catalytic converter

-great light throttle driving BUTT the harder you pres the go -pedal the slower it goes
-check engine soon light
-the engine will slow to and idle and possibly die
-Hard starting
-gutless
-gas guzzling
-Lack of power
-sluggish performance
-cat actually implodes on itself
-stalling
-car will loose power when warmed up
-sluggish on takeoff
-may smell rotten eggs
-bad smell from the tail pipe
-sounds and runs like someone put a potato in your tail pipe
-car seems bogged down
-Markedly decreased low rpm power
-Engine runs a little hotter than normal at constant cruising speeds
-Exhaust leaks near header that won’t seal in spite of new gaskets
-Bucking or hesitation while accelerating
-Cat’s exterior surface temp cooler near outlet
-Very poor accelleration
-actually bogs down more the harder you push the gas
-high converter temp. to a point that they will glow red
-Ever experienced constipation?
Start off and at first, not too bad, but something isn’t right. The longer you go without relief the worse your performance. Things just don’t go right, things smell, got no get-up-and-go left.
It is kinda like that when a car’s cat melts down. When yo first start, it MAY seem kinda o.k. but you can’t really put your finger on the problem. But the longer you drive it, and the warmer it gets, the less willing it seems to go anywhere, particularly very fast or with much of a load.
-when u hit the accelerator the car usally will shut itself off

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