You forgot about me. I already had my long, drawn-out argument with him over trans flushes and the logic thereof.
Dropped Tranny pan & changed filter - Now I have a...
Hi all, I'm going through my new to me 08 Envoy with 160,000 miles on it. Recently I dropped the transmission pan, cleaned it up, and replaced the filter. The old fluid didn't seem especially bad. it was red, maybe a little dark red. Certainly not brown or black. I didn't think anything...
www.trailvoy.com
Once a cat is plugged, it'll never get hot enough to burn out the accumulated carbon. The engine will run so poorly that it will just get worse until the vehicle won't run at all.
I had the OEM cat on my '03 plug to the point that the vehicle would barely move--2--3 mph. I went from "Perfectly Normal" to crawling in the space of maybe forty miles, on I-90 in the middle of South Dakota. (The MIL light had been on for hundreds of miles; but I had no tools with me. Tried to get home...failed.) Had the cat replaced with a "universal" cut-and-weld job.
That plugged OEM catalyst went to my friend the automotive machinist. He's got a parts-cleaning oven; heats greasy engine blocks and such to the point where the grease and oily dirt turn to ash. He baked my catalyst as an experiment. It seems to have worked--I can see through it again--but it's never been reinstalled on a vehicle.
As further advice on Trailblazer 4.2 six-poppers and O2 sensors...O2 sensor sockets are really pathetic at REMOVING seized O2 sensors. They do a great job of installing them. The split down the side makes them weak--you apply enough torque and they just spread open and slip. This damages the hex, if it's bad enough no wrench will work. But all that is OK, because the exhaust manifold is probably cracked anyway. Therefore, the better solution is to NOT **** with the sensor itself, but to replace the entire manifold and heat shield, with a new O2 sensor in the new manifold.
The hole in the manifold is for the O2 sensor. Note the huge crack right next to the O2 sensor hole.
The heat shield covers the entire manifold; it's hard to see if it's cracked or not--but maybe you hear exhaust leaks around the manifold, or maybe you can see cracks around the O2 sensor bung through the hole in the heat shield that the sensor pokes through.
If that's just not practical, buy a Wright deepwell impact socket. No split down the side, and unlike most other impact sockets, there's enough room inside for the body of the O2 sensor after you cut the wire harness. Even if you don't have an impact wrench, this is the socket to use with a quality ratchet or breaker-bar and a long cheater-pipe.
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Wright is a family-owned USA tool company; it's good stuff at half or less the price of Snap-On (and the Snap-On socket doesn't fit over the O2 sensor body.)
