I have a 02 chev silverado with 110 000 km.
Is there any engine maintenance I should do? A local radio show mentioned
changing the thermostat and O2 sensor every year but my manual says nothing
of this and plugs are not do until 166 000 km. I still have original air
filter but the gauge says it is still very good and the gauge is working
I consistantly get 12.5 mpg combined city/highway with the 4.8L and this
seems very low to me (EPA estimates 18 city/22 highway). I feel I should do
something but like I said the manual has nothing scheduled. Transmission was
rebuilt 3 times so it has fresh filter and fluid.
There used to be a radio commercial for some product -- I forget what,
and that's supposed to be a frequent problem with clever commercials;
but I digress -- that started out by asking people, "Would you rather
play this tuba full of mayonnaise, or..."
My humble guess is that that's what your engine is doing, if you have
110,000 km (70,000 miles) on the original air filter. I'm impressed
by the range of the memory map in the engine computer, but am
reserving judgements on the efficacy of the maintenance telltales.
It is more plausible that the plugs are still decent but it probably
won't hurt to change them. Yank one or two and see what they look
like. Think about the maintenance interval of the plug wires too.
I basically never preventively replace an 02 sensor -- just wait'll it
throws a trouble code. (By the way, On-Board Diagnostics II scanners
are your friend -- there's even at least one now that doubles as a
driving computer of sorts, so you can see what sort of mileage you're
getting under different conditions). The thermostat I replace during
routine replacement of radiator hoses and coolant, whenver that either
comes up on a schedule or strikes me as a good idea, whichever is in
I'm rather bothered by the idea that you've gone through three trannies
in 70,000 miles. Que limon! Or are you using it to pull/haul really
heavy things all the time? That too reduces mileage a lot.
Anyway, start with a new air filter. They're pretty cheap, and engines
suck a lot of air, and the air is dirtier than most of us realize.
Even if you still have other problems to look for, that alone will
Best of luck,
The tranny problem was the sun gear reaction shell. About the air filter.
The box has a vacuum detector on it which detects the slightest suction that
would be caused by restricted air flow from a dirty filter. I removed the
unit and with the slightest suction from my mouth the gauge moved into the
red/replace area. In the truck it is staying in the green area. This tells
me the air filter is allowing plenty of air thorugh it. I do not haul or tow
anything. I do have 235/85-16 tires on which are 4% taller than the stock
245 70 16 but I factored that in when computing my mileage. The engine runs
and idles perfectly.
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