Normally at half a tank im at 150 miles, now though at half a tank I was at 80, and at 1/3rd left, im at 130.
The CEL came on during hard acceleration up a hill. Sense this issue happened three weeks ago i discovered that my most rear exhaust hanger had come undone. Possible that the cat sensor wires snapped and is screwing my fuel efficiency?
Autozone tells me Fuel mixture system lean bank 1.
Ive had this issue on bank 2, and it turned out to be the coil, they're all stock, at 182k miles now.
Truck is still powerful, but at idle has a light chug, and during hard acceleration shudders a bit.
Causes Low fuel pressure, (pump/filter/blockage? I'd imagine id have a loss of power?)
Faulty MAF/VAF sensor (its stock and clean)
Cylinder misfire condition (this doesnt say a whole lot, coil?
Faulty HO2/AF sensor (is this the cat sensor?)
Large vacuum leak (ill spray starter/brake fluid, but doubt its this. i have all newish hoses.)
Also, this info is from autozone, when my parents had a cel on their 98 GMC, the dealer told them it happend a certain number of miles ago, which they calculated to a hill, it was a misfire and happened once and that was it. so the dealer reset the computer and theyve had no problems sense. Can a toyota dealer tell me anything more? Sure would be nice, autozones info seems.... universal and leaving some to be desired.