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  1. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    So far, so good.
  2. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Honestly, no. I live in Missouri but this rig has only lived in Texas, California and Nevada so everything comes off easily with a socket. It’s a Missourian’s dream!
  3. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    One-Week Update. May jinx it but I’m posting, regardless. Typically I would’ve had at least a Pending by now.
  4. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Original leak area.
  5. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    This is not my best welding work but man, that's a tough area to get into. Lots and lots of build-up required. Long electrode stick-out required which is not ideal! But hey, no leaks.
  6. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Welp, I've got it buttoned back up on the rig. No visbile leaks at any of the joints, etc. I've driven it 4 drive cycles so far and no CEL or pending codes on my OBD reader. We shall see. At any rate, I'm glad I fixed the exhaust leaks, even if that doesn't fix it. I'll report back one way...
  7. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    "fix" it, as in keep CEL from kicking on. Not an actual fix, correct. Unsure on the P0420. Still hoping it's caused by an exahust leak at this point. This isn't my daily so I'm taking my time on it, parts-wise. I'm all ears on any input you have for this. Thanks!
  8. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Yah, you'd want to wire brush that junk off.
  9. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Wished you lived close. I'd weld that up for you. Others have reported pretty good long-ish lasting results. If you can remove that section, a muffler shop will weld that up for you easily too.
  10. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Standard MIG welder with .030 wire. Had to build up the weld to get everything sealed since that's a deep crevice.
  11. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    I got it welded up. Had a couple more leaks in that area than previously thought--you weld up one hole and it finds the next one and so forth. Finally got it all good to go. Pressure tested it on my bench with my air compressor. No bubbles anywhere along that crotch. I put it back in the...
  12. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Popped the Y-pipe off. One of the nuts spun but I got it off. It boogered up the stud threads then the stud would not come out so I went ahead and took off the front exhaust manifold. Much easier to get the stud out when it’s on my bench (torch and ice method). Ordered a new stud, nut and 2...
  13. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Figured as much! Thanks. I just got back from a 50 mile round-trip in 90° weather and it did not kick a check engine light so I’m just gonna keep watching things for now. The code is pending though.
  14. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Well folks, I just needed to turn up my leaf blower up to full throttle to find the leak at the Y-pipe. I know how to weld—is there anyway to get in there and take care of that leak or do you have to pull the manifold off? Thanks!
  15. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    No it’s not. I’m tempted to try a flange-style O2 sensor extender. If that fixes it, bad downstream cat. I’m curious if this one would work. Good chance the O2 sensor flange size is the same so I may try it...
  16. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Well, shoot. No CEL yet but I went for a 35-minute drive last night and I do have a "pending" P0420 on my OBD Fusion app which means it will set during one of my future drive cycles. I'll check for more leaks but that leak between the cats was relative large and it wasn't the P0420 problem so...
  17. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    I went for a short drive and no code yet (may not have driven it long enough to set code-no code pending on my reader either) but the voltage on the O2's seem to be following each other. It may be the cat(s). We'll see.
  18. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    New gasket in and no leaks via the leaf blower/soapy water method. I'll clear the P0420 and test today. I love working on this rig...my first non-rust belt 80 or 100 out of 4. Exhaust flange bolts/nuts off in 5 minutes.
  19. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Yep, that was a cold engine.
  20. harrydunn

    P0420 Exhaust Leak Bubbles Between Cats 1 and 2.

    Posting this pic here for the visual learners in the future. ;-)
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