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So I don't know what to do anymore and it's getting really pricey on gas these days.
I have a 2002 Acura RSX-S. I used to average 8-10L/100km. Now I'm at about 12-13L every 100km.
I already changed my Air filter, oil change, spark plugs. No I don't drive aggressive. I've started to notice this since september but it hasn't went away.
I have no CEL, no I don't think changing the primary o2 would help. What else could I do?
What hasn't Killed me, has made me more tolerant of RS!
Join Date: Oct 2011
Location: burnaby
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it'll be like this till the weather gets warmer again, heck if I drive my 350 without really warming it up, it'd be at 55L/100km for the first 5-10mins.
Not disagreeing with the poorer winter gas mileage at all, but with my pos beater, I'm only seeing ~10 - 15% reduction in my gas mileage, whereas the OP is seeing a 30 - 50% increase.
Sounds pretty crazy if you ask me. Does the OP mostly only do short drives?
Because O2 sensor can be sticky and it still will not have a CEL. It is usually in the marginal scenarios like this. I don't know about Honda/Acura's diagnostics tools but BMW's diagnostic headunits can show the reading changes while the car is being driven. If the sensor reading is not changing as quickly, it is time to change. CEL means failure.. not necessarily non optimal working conditions.
[QUOTE=see.lai;8151885]
Like I said though, the CEL isn't showing, why bother with the O2?
I checked tire pressure bi-weekly. I have a short ram intake, but that's not really the point because I had way better mileage last year. Everything is the same, tires are the same as last year.
I will check the O2 as well then. I just didn't want to buy and replace if it wasn't the problem.
check plugs and oil, make sure your trans oil is in good shape otherwise change it out.
you already checked tires but also make sure that your bearings are in good shape and that your brakes are sticking.
you cat also clogs slowly over time but i wouldn't recommend changing it until you blow out your o2 sensors.
check all you belts and pulleys to see if anything is causing extra restriction and clean out air filter.
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the chances that it's winter vs. summer difference is minimal - this is a huge decrease in economy.
the winter/summer argument is also slightly nullified by saying that colder air in winter makes for higher O2 density, thus increasing economy (hence why so many have CAI)
likely a sensor is bad/needs cleaning, so go to a shop accordingly if you don't know your sensors/how to test/clean them
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