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Cats plugged??????

Discussion in 'General Chevy & GM Tech Questions' started by vncj96, Aug 23, 2012.

  1. vncj96

    vncj96 Epic Member 5+ Years 1000 Posts

    I have some power and hesitation issues on my mule, I am g
    beginning to think the cats are clogged, short of cutting them off are there any tricks that really work for such diagnosis?
  2. moogvo

    moogvo Epic Member 5+ Years 1000 Posts

    The best test is doing a back pressure test. This is where you take out the o2 sensor and attach a pressure gauge. you can also measure the temperature of the inlet and outlet of the cat after running it a while. If the front is 400* or more hotter than the back, chances are that it is clogged.

    You can also take out the o2 sensor upstream of the cat and see if you gain any power. It will be loud but it will tell the story!
  3. MTM

    MTM Rockstar ROTM Winner 100 Posts

    Does the power issue continue throughout driving or just when you start out from a stop?
  4. vncj96

    vncj96 Epic Member 5+ Years 1000 Posts

    Yes when the cruise is set on the highway it always feels like it is going headfirst into the wind, i still get 17 mpg on the highway even with the bigger tires on, but it just feels like it is always struggling. But I do know that if I put this up against my suburban and raced them and did a passing test my suburban would win hands down even with power and weight disadvantage. The mule also has a new fuel pump, filter, pressure reugaltor and O2 sensors
  5. MTM

    MTM Rockstar ROTM Winner 100 Posts

    I would say plugged cats. Had a similar problem but it was just at start and it ended up being the MAF sensor

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