I have a 1999 Neon. I got it a year ago with 82,000 miles on it. I change
the oil and filters regularly. I started with 29/33mpg, but now, at
105,500, I get closer to 25/28mpg... on good days. What has happened to my
good milage? :ohcrap:
I actually have lots of questions about this car, but I'll start with this. Can anyone help?
I'm betting 02 sensor. If it is bad, you can loose up to 15% in gas milage.
Any check engine or various MIL's on the dash illuminated. If the o2 goes out on a 1999, that's OBDII and the CEL should come on due to o2 failure or heated circuit failure. Might recommend a scan of the ecu/pcm. Also, have you gained weight? That'll do it too! :laughing: :laughing:
When was the last time the car received a good maintenance tune up?
Air/fuel filters, plugs, wires (if applicable), checking EGR systems, Scanning the OBDII computer system, listening for vacume leaks, etc.
I agree -- basic tune up will likely go a long way to improve mileage. Plugs, wires, air filter, pcv valve - it's cheap and quick on this car. Also - check your tires -- low tire pressure can increase your fuel expenditure exponentially. Simple and true. :wink2: