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  1. UseYourBlinker

    UseYourBlinker 1 ton status

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    How can you tell if a cat is bad on a exhaust system??


    <font color=blue>My rig </font color=blue> <A target="_blank" HREF=http://community.webshots.com/user/vwryda>http://community.webshots.com/user/vwryda</A>
     
  2. muddin4fun

    muddin4fun 3/4 ton status

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    Diconnect the pipe(s) at the heat riser valve/manifolds/headers and see how it runs. If it runs better, then it's your cat. If it's the same, then something else is wrong. Hope this helps! [​IMG]



    <font color=orange>hAS ANYONE SEEN MY cAPSLOCK KEY?</font color=orange>


    <A target="_blank" HREF=http://k5chevyblazer.homestead.com/home.html>http://k5chevyblazer.homestead.com/home.html</A>
     
  3. Seventy4Blazer

    Seventy4Blazer 3/4 ton status

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    i could be wrong but if it is your cat your motor will run a bit hotter. not much till it gets real bad. like i said i could be wrong.
    Grant

    1974 Chevy Blazer Cheyanne. lots of plans for it....
    but it is on 33's now, with saggy old springs. i am in so cali if ya got any parts for me.
     
  4. BlueBlazer

    BlueBlazer 1/2 ton status

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    Where I work we test it with a thermometer like device. If I remember right, if the pipe going in is hotter than the one going out then it is bad. This is because the catalyzing process in the converter creates heat and make the outgoing exhaust hotter. So under normal conditions the out pipe should be hotter. Also you could hit the bottom of the cat with your hand (after its had time to cool off) and listen for a rattle. If you hear a rattle the catalyzing material is breaking up so the cat needs replaced. If Ive missed anything please feel free to correct me.
    Tyler

    '82 K5 6.2 Diesel, sm 465 np 205, 35" muds
     
  5. Itali83

    Itali83 1/2 ton status

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    I just went ahead and got a totally new exhaust for my truck. I orderd it out of performancetruck.com. I got the high flow (honeycomb style) cat and flowmaster cat back system. I thought that my old cat was getting plugged too. I had no definite proof, but I just thought that with 211K on it, it was probally toast. Well, after the new exhaust, my truck has BALLS!!! If you got some spare cash, I would dish out the 300 bucks for the whole system, you will not regret it.!! I know a little off the topic, but just putting it out to ya.
    Ben 87 Jimmy
    <A target="_blank" HREF=http://www.bens87toy.coloradok5.com>http://www.bens87toy.coloradok5.com</A>
     
  6. 2Dogs

    2Dogs 1/2 ton status Premium Member

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    I think that there is an exhaust pressure diag tool that goes into your O2 sensor. (if you have one) Can someone (one of you Chev mechs) confirm that for me pls?
    Dave
     

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