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Re: Gas mileage, O2 Sensor, Spark Plug, etc. Posted by sam96CS [Email]  (#852) [Profile/Gallery]
(more from sam96CS) on Mon, 14 Sep 2009 16:05:59
In Reply to: Gas mileage, O2 Sensor, Spark Plug, etc., tz, Mon, 14 Sep 2009 14:04:07 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The worst thing you can do is replace parts before diagnosing the problem. I don't know whether anyone has posted a fuel economy checklist. If so, then it would be very long.
I have 152,000 miles on my original O2 sensors and can get 30 mpg on the interstate when I behave myself. In pure city driving I get 21 to 22 mpg only because I'm easy on the gas when pulling away from stop lights. The car is a 96 CS automatic, and my recent conversion to fpt hasn't made much of a difference in mpg. You're driving an automatic with a lpt turbo and will never get the high mpg of a manual Aero driven at 55 mph. Not without some mods so major you might as well sell your CS and buy a manual Aero.
Yes, a bad O2 sensor will cause a check engine light. When you first start the car the check engine light should briefly turn on and then turn itself off. That is how you know that (1) your OBDII system is working and (2) so are the check engine light bulbs. If it passes this test, then forget about your O2 sensors, catalytic converter, etc.
Some things you can do or check:
Brakes: Any dragging? Does the handbrake fully release?
Alignment: poor alignment can scrub off 1 mpg.
Tires: Try 36 psi front & rear cold inflation.
Windows: keep them closed. Let the ACC system do its job.
Plugs: keep them gapped around 0.9mm (about 0.035").
DI Cassette: Smear a dab of dielectric grease around the end of each boot.
Air filter: Can you see light through it? Replace if not.
PCV: verify (blow or suck on it) air flows only towards the intake manifold.
Vacuum hoses: All connected? Any old/dried/cracked? Cheap to replace.
Gasoline: You need gasoline with a high quality detergent package. There's a web site named Top Tier Gas that lists who sells the good stuff in all grades. Don't assume you have high detergent gasoline just because you bought a major brand or premium octane.
Oil: Change at 3,000 miles if conventional, 5,000 if synthetic.
Serpentine belt area: Any pulleys/bearings going bad? This is a long shot.
Egg: place between right foot and gas pedal. Seriously, your car is very good at turning gasoline into energy, and it will do so very rapidly upon request.
, Wed, 16 Sep 2009 08:44:08, Wed, 16 Sep 2009 13:53:26, Thu, 17 Sep 2009 11:00:15
, Thu, 17 Sep 2009 15:11:31, Thu, 17 Sep 2009 15:31:30, Thu, 17 Sep 2009 20:55:09, Wed, 16 Sep 2009 16:04:33, Mon, 14 Sep 2009 16:05:59 <-- Viewing This Message, Mon, 14 Sep 2009 17:31:01, Mon, 14 Sep 2009 14:18:41
, Tue, 15 Sep 2009 10:33:52, Wed, 16 Sep 2009 12:54:45
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