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Published on May 19, 2011
My 2004 Chevy Trailblazer LT 4.2L, 4x4 w/ appx 103k miles(recently paid off), experiencing major driveability issues. I started having problems about two weeks ago when my A/C stopped blowing cold. Thinking the issue was isolated, I evacuated the system, replaced the mode cycle switch, and accumulator then pulled a vacuum and recharged. System now blows ice cold (40 deg F) until the engine warms up. Since recharging the A/C, not only am I still experiencing the same problem, but driveability has deteriorated as well. Feels like either it is dumping gas or the exhaust is restricted. Shifting is delayed up to about 4k rpms from first to second, and second to third, and I'm not even able to get up to speed for O/D to kick in. I've installed a new air filter, cleaned the throttle body and intake track, replaced the spark plugs with the correct AC Delco iridium plugs, and replaced the upstream 02 sensor with appropriate AC Delco part, confirmed fuel pressure at about 55psi, and reset the ECM.
After all of the above, I came to realize that the exhaust manifold is glowing red after a moderate drive(indicating either a lean mixture or exhaust restriction), and subsequently removed the exhaust from the rear of the catalytic converter thinking it would free up a little restriction, but it seems to have made the problem worse. Because of the rust on the manifold to downpipe connection, I've been unable to remove the cat to verify visually if it is clogged or not.
Before I take it in and have the cat replaced blindly, I'm open to any ideas...keep in mind that I am not running any codes, and I have no SES or REP lights illuminated.