just a stab but maybe the o2 sensors are going south, also its a 97 so
its 11 years old, maybe the catalyst is plugging up? Tires inflated to 35
psi? (or what ever the door asks for on the tire info placard) using E85
fuel? I understand many see a drop when they switch to e85 over regular
could be other things, could be a lot of things.
Personally I would suspect you'd see a code of the O2 sensor(s) were
off, but that could be the problem. The O2 sensors are in the exhaust
system, one in front and one behind the cat typically--not sure about
your truck, it may have four with two cats.
exactly the upstream o2 sensor (the one(s) closest to the engine) has
everything to do with fuel management. It is what tells the computer "too
much" or "too little" in regard to what amount of fuel its putting in the
engine while its running.
The sensor reading could be off and the computer would have no way to
tell. the only thing the computer can tell about the o2 sensor is whether
or not it is switching (rich/lean) as it should. and that is what the
computer watches for in order to set or throw a code.
the catalyst is a "muffler like" device in the exhaust pipe. what i mean
by that is the shape is similar to a muffler. you will find it between
the muffler and the engine. This is not a part that most could replace on
their own as the removal usually involves the use of a torch.
You *really* expect us to believe that?
The 'new' blends of piss and gasoline will reduce your mileage some as
well. I think you are underestimating the loss due to the topper but I
could be wrong on that since I can't see it.
Does it seem to perform properly still? I could see a failure to lock
the TCC as a possible issue, draging brakes, or other similar thing,
but I suspect your fuel is the main issue. The mandated blending of
ethonal <sp?> hurts mileage (you burn the same amount of gasoline per
mile, however, so it doesn't (IMHO) help any on pollution).
Yes, it still performs properly. No dragging brakes or inlaws. It's
but maybe 50lbs in the back. What is a TCC?
And can the O2 sensors be changed in my driveway or do I need to
take it in?
the TCC is the Torque Converter Clutch in the transmission.
the o2 sensor can be changed in the driveway, takes a 7/8" wrench, some
penetrating oil and a lot of patience. they do make special sockets to
remove them but i've found that if i can get a good 6 point combination
wrench on the thing i've had better luck getting them out.
Ok guys I've had a chance to crawl under there and find
the O2 sensors. While under there I see that the entire muffler
is split. Its not noisy but I might as well change it. I can't
the last time I had the catalyst changed if ever so I might as
well replace that with the O2 sensors on both sides.
Thanks for all the advice.
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