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Old 02-14-2010, 03:48 PM
Ranger01 Ranger01 is offline
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Default how do you know if your cats are bad?

I am getting about 200 miles to a tank and it is ridiculous. If I were to get new cats like magnaflows would that help? How do I know if my cats are bad?
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Old 02-14-2010, 03:51 PM
STL STL is offline
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Stink like rotten eggs while driving

Or get under truck and shake it. If it rattles it's bad. Only 2 ways I know to tell


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Quote:
The easiest test for converter plugging is done with a vacuum gauge. Connect the gauge to a source of intake vacuum on the intake manifold, carburetor or throttle body. Note the reading at idle, then raise and hold engine speed at 2,500. The needle will drop when you first open the throttle, but should then rise and stabilize. If the vacuum reading starts to drop, pressure may be backing up in the exhaust system.
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Old 02-14-2010, 03:56 PM
Ranger01 Ranger01 is offline
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Alright Myke thanks. They don't smell bad nor rattle but if I so replace them will that help with the gas mileage? Or what is causing the bad mileage?
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COBRA disc conversion
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Old 02-14-2010, 07:41 PM
BigT8600 BigT8600 is offline
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I'm dealing with check engine light telling me cats are bad...but no egg smell. Not sure how I would shake the cat either...
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Old 02-14-2010, 07:42 PM
STL STL is offline
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get under the truck and grab a hold of it and shake it.
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