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Discussion Starter · #1 ·
So how do you know when u have a clogged cat? i know bad gas mileage is one of the symptoms. Will stuff like Xylene clog the cat?

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Put your hand over exhaust tailpipe and see how much flow it has. I have heard if the cat is clogged it will suck in on your hand.
 

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you will also have a huge performance loss when your cat is plugged...trust me, i went throught the same thing this summer...i had the STOCK cat on after 60k miles and finally noticed i was losing lots of horsepower...changed the entire exhaust system and downpipe and have never been happier since
 

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xylene is not good for cats (or dogs. sorry had to.) anyway it is not safe on O2 sensors either. this can cause a bigger problem yet. never heard of a clooged cat sucking on your hand but you will notice less pressure than usual. mpg will drop. doggy on acceleration. sometimes will make a rattling noise. plus to much pressure building up from the turbo.

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Discussion Starter · #5 ·
I thought xylene wouldnt hurt o2 sensors and cats. i use xylene frequently just to keep the injectors clean
 

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Xylene IS safe for cats (not live ones) and O2 sensors if you dont exceed the 33% ratio to gasoline. It is also a active ingredient in pump gas.

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Yes, it is safe on sensors and cats....

Best test for a clogged cat is to take it off and see how it runs. A clogged cat will usually not make boost quickly or easily, and the car may run hotter. I believe the vacuum will be low as well.

You can see light thru a good cat when you hold it up and look thru it.
 

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Discussion Starter · #8 ·
well my car makes boost pretty fast and the car doesn't run hot. so i guess my THDP cat is still good. Vacuum readings are at 16-17
 

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Anyone notice that Zap spelled backwards is Cat?
 

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sorry about the xylene comment. i was thinking of the wrong octane booster. i checked that today at work. berrymans has an octane booster called go go octane booster and says right on it not safe for cats or o2's. not sure on the active ingredient is on it though.

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