Question???

[edgaranah1]

Hello

How can someone tell when their catalytic converters are nearing their death point? This isnt on my Yukon but its on my 02 Buick Park Avenue. Im seeing a dramatic MPG Decrease 6.8MPG city to be exact. and when in Idle Im starting to hear a sort of chugging sound or like a shaking can of marbles it runs smooth though no hesitation what so ever. hadnt moved the car for about 4 months so if thats any help to u guys.

thanks.


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[07Burb]

What you're experiencing does sound like a cat issue. I've recently inherited my grandma's very low mileage caprice and dealt with a very similar issue. My mpg were low, it choked and fell on it's face upon acceleration and when I started it up or revved the motor the cat rattled. I had it replaced (as well as having a magnaflow installed ) and it runs smooth as silk now. Sitting like that really does the car no good at all.

 

[domin8]

What does the exhaust smell like? If it smells like rotten eggs you can bet it's the cats.

 

[edgaranah1]

Thanks Jacob I guess I'm going to have to break the piggy bank lol. What seems weird is that it runs smooth there is no loss of power as far as I can tell. The car has 90K miles on it but before I bought it it had been sitting for 3 years in my bosses garage used it for a year and hadn't moved it for the past 4 months. My dads right having a car without driving just messes with everything.

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[edgaranah1]

What does the exhaust smell like? If it smells like rotten eggs you can bet it's the cats.

Hhmm haven't done that ill try and see if I sniff anything wrong with the exhaust fumes. Thanks.

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