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Tune up = worse gas mileage, wtf


Well, this thread has been around long enough that it might be time to check the air pressure in the tires...
I think I would be disappointed after doing all that work and having the thing not work as well as when I started.

I re-read, and noted this:

I'm really starting to wonder if the carb cleaner damaged a sensor or something in the TB or IAC

And the ACT sensor came to mind. The Air Charge Temperature sensor reports the incoming air temperature to the computer. The computer responds by enriching the mix when cold, leaning when warmed up. You might also check the air stove vacuum switch if you have one. My truck has a sensor in the air box that opens when the incoming air is over a set temperature. If colder, the vacuum pulls a flap in place to get air that has been heated by the exhaust manifold fed to the intake. Supposedly. I am not sure if it works or has ever worked, but I am not in the cold-cold, just frost irregularly and snow more irregularly.
IOW, you might check the ACT readings, resistance == some temp, there's a chart somewhere. And looking for a valve & flap and good vacuum lines wouldn't hurt.
Just a few thoughts...
tom
 

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