So this is interesting: I replaced both my cat and my exhaust from the cat back. Runs way better now, my idling issues on startup and issues trying to crank over (idle would surge on start up or I had to crank it over for a long time sometimes before it would finally catch) are gone.
BUT now my mpg has radically dropped. Yes the temps have been horrible lately, barely making it into the lower 30's and Im letting it idle and warm up every day for about 15-20 mins before leaving. But Im somehow getting 12-13mpg consistently. Yes winter fuel is bad and less mpg, I have used 4wd alot (several fill ups didnt no snow), but it stays consistently low. No CEL light, no performance issues, driving same way I always do.
Im thinking maybe I should replaced the O2's. Rear O2 I replaced, the front poses a problem. Front sensor wire somehow came undue and got to close to the cat. The plug is melted enough I cant seem to get it apart of salvage it really. Im leery of those direct connect sensors since I have zero clue which wire would go where (maybe they have directions?). So I was thinking I need to find me a 89-95 toyota truck and yank the sensor/wiring off of it just to get the plug and then I can use a normal sensor.
Truck had a fulltune up last year, t-belt about 7k ago, and was consistently getting about 15mpg (mostly city/some hwy) for eons. I do wonder if the new cat and exhaust is contributing to it-but if the old cat was clogged (and it was kinda) I would think I would have had to make the truck work harder and used more gas.
IDK..
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