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Thread: Broken exhaust flex pipe, exhaust removal

  1. #1
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    Broken exhaust flex pipe, exhaust removal

    The flex pipe on the exhaust came undone on the inside, braided sheath is still intact, but definitely blowing exhaust out in there, loud as hell, and the motor stumbles I wager since the rear sensor is not getting the readings it expects.

    I'm going to weld a new one in, my question regarding removing the exhaust. I saw there are bolts after the header, and a sort of collar fitting just aft of the catalytic converter. Can I undo the fittings at those two sections and pull the middle section out, or does the hind end of it need to come down as well. I'm just not certain how that joint behind the cat works.

    Also while I'm in there should I look at redoing the cat, I don't know if it had ever been replaced, 215,000 miles on it now, and it was driving just fine with what was in there. I just don't want to weld a new flex joint in to have to replace the cat in another 25k. My other vehicles with this many miles on them don't have converters so I'm just not sure what lifespan we're seeing out of them on the vans.

    Thanks!
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    jonnynof#6917

  2. #2
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    Re: Broken exhaust flex pipe, exhaust removal

    Everything should just unbolt, though penetrant and sometimes even the blue flame adjustable, will be required.
    Looks like standard gaskets fr and rear and as that pipe is part of the cat section, as long as the cat is good all should be fine.

    Cat's fail when they get contaminated or they rust out. If contaminated, you will see when you look into the input side.
    Should be a lovely honeycomb thing going on and you should be able to see defuse light thru it (strong flashlight required).
    If it looks like something is melted onto it, thats contaminated and time for replacement.

    Rock auto does have a variety of pipes in stock at ridiculously cheap prices, if you wanted the easy way out.
    Maybe even just looking at the pictures would help you see what you're extracting and the gaskets/hardware required?

    An aftermarket Cat won't have the lifespan of factory but seeing as those A/M pipes are missing a zero (compared to factory pricing) its probably not an issue.
    BB

  3. #3
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    Re: Broken exhaust flex pipe, exhaust removal

    Thanks man, yeah it was shortly after I was looking at flex pipe that I saw there's still an aftermarket for that whole setup. Hell even a Magnaflow version, which struck me as humorous. I may opt to just replace the entire part as is and save myself the time of lining things up, cutting out the old flex, making sure things are still aligned and welding in a new one. That and my garage being a wreck right now makes getting to the mig a bit of a pain. Gonna pick up some penetrating spray and give it a couple days soak til I can get at this come Sunday. Either way, appreciate the info.
    On discord? Come Chat https://discord.gg/aZqCZaR
    jonnynof#6917

  4. #4
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    Re: Broken exhaust flex pipe, exhaust removal

    Yep, got it apart, fortunately nothing needed the torch just a couple ugga duggas following the application of deep creep. Only irritating part was the replacement didn't have studs for the forward hanger, so I had to pick up some bolts. All is good now though. I took some video we'll see how it turned out, if anything is usable I'll pop it up on the tube.
    On discord? Come Chat https://discord.gg/aZqCZaR
    jonnynof#6917

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