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Old 04-10-2012, 12:37 PM   #1
2nd Gear Member
Join Date: Mar 2009
Location: Trent Hills
Posts: 192
540 catalytic converters failing?

Hey guys,

Wondering if anyone has replaced the cats in their 540 and why... A couple weeks ago the car died on me after a half-hour trip, it would start, then die right away. Seemed to be getting fuel, spark, etc, but would just crap out at idle. I could keep it 'going' with foot on the gas, but that didn't really get me anywhere.

After getting it towed home I can start it and it will run, albeit somewhat weakly with a lower than normal idle, would dip to 400-300 and sometimes less. I haven't been driving it at all as I am fearing getting stuck again.

Listening at the rear exhaust you can hear a pronounced vibration that comes and goes, comes and goes.

Does this sound like a clogged or otherwise toasted cat(s)?
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