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    Persistent P0307 (also a P0420)

    Falling under the "you can't make this s*** up" category, I changed the plugs and it was worse. Very solid misfire (as opposed to the intermittent one I had previously). Immediate "Service Stabilitrak" and "Stabilitrak Disabled" messages. I double checked my work (even though it's tough to mess...
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    Persistent P0307 (also a P0420)

    Okay - compression test results on the left bank are: 1 - 180 psi 3 - 155 psi (!) 5 - 180 psi 7 - 160 psi So compression is okay in the #7. And, the insulator on the #7 spark plug is cracked. I know I swapped that from the #5 a couple of months ago and it did not correct the problem. I'm going...
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    Persistent P0307 (also a P0420)

    Thanks for the replies. I think the 420 preceded the 307. The light's been on a LONG time. There was a brief period of time when it went out and I raced over to the state inspection station and got a 2-year sticker. So I'm good to 2020. But...I need to fix it. I think the cats are probably...
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    Persistent P0307 (also a P0420)

    Stabilizer bar tore away from the frame. Both gas tank straps rotted through. Both 1/4s, all the doors, tail gate, fenders, etc. all are rotted through. I've been replacing stuff as it goes but I couldn't keep up anymore. I got another vehicle as a daily driver and kept the Avalanche for...
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    Persistent P0307 (also a P0420)

    Thanks for the reply. After reading your post I tried that and it's not sucking in carb cleaner around the intake gasket. That's somewhat of a relief since I don't want to have to replace that gasket. Although, i could still be looking at a mechanical problem. I'm going try some SeaFoam or...
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    Persistent P0307 (also a P0420)

    Hi all - this is my first post here. I have an '07 Avalanche 5.3L. Same drivetrain most of you have. The Avalanche forum isn't very active and I noticed this one is. So I figured I'd try my luck with a solution here. It has 178K miles on it and I've really done nothing but routine maintenance to...

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