Symptoms of plugged cat
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Joined: Sep 2002
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From: Elk Grove Village, IL
Car: 1989 TransAm GTA
Engine: One sweet modified 355 TPI.
Transmission: The kind that shifts....
Quiet exhaust.
Doesn't want to rev freely like it used to. If its really bad the car won't even start. Most of the time though you'll hit a RPM wall. Now matter how much gas you give it, it just won't go faster.
My original cat plugged itself up and it was quiet as a mouse. I have a Flowmaster 80 muffler on there so it shouldn't be quiet at all. When I gave it full throttle it would hit a wall about 3,500rpm and wouldn't rev higher.
You can test it by removing the cat and starting the engine.
Doesn't want to rev freely like it used to. If its really bad the car won't even start. Most of the time though you'll hit a RPM wall. Now matter how much gas you give it, it just won't go faster.
My original cat plugged itself up and it was quiet as a mouse. I have a Flowmaster 80 muffler on there so it shouldn't be quiet at all. When I gave it full throttle it would hit a wall about 3,500rpm and wouldn't rev higher.
You can test it by removing the cat and starting the engine.
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