bad gas mileage in civic cx - Page 2 - Fuelly Forums

Click here to see important news regarding the aCar App

Reply
 
Thread Tools Display Modes
 
Old 04-02-2006, 12:36 PM   #11
Registered Member
 
Join Date: Apr 2006
Posts: 8
Country: United States
ok, I'll be doing that when

ok, I'll be doing that when I go home for easter. I'm so sick of the dorms and not having an room to do anything.
__________________

jerm001 is offline   Reply With Quote
Old 04-02-2006, 01:01 PM   #12
Driving on E
 
Matt Timion's Avatar
 
Join Date: Sep 2005
Posts: 3,110
Country: United States
The Civic CX is a obd1 car,

The Civic CX is a obd1 car, so I'm guessing it has a four wire o2 sensor.

I'd guess that the o2 sensor is probably a major factor in your poor gas mileage as well.

The larger tires are also throwing off your speedometer so you're actually getting better gas mileage than you realize.

If you're on your original o2 sensor, I'd recomment changing it anyway. o2 sensors start working less well after 30k miles. if you're over 100k it's definately going to not work as well.

Besides that keep everything as stock as possible. Don't get a K&N air filter (unless you already have one). STick with recommended oil, gas, etc.

As for your octane, what is your altitude? Here in Salt Lake City the regular octane is 85, and that's mainly b/c of the high altitude (4000 feet). I can use 85 as long as I don't suddenly drop to sea level.

If you're around the same altitude as me anything around 85 octane is good.
__________________

Matt Timion is offline   Reply With Quote
Old 04-02-2006, 01:08 PM   #13
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
The civic cx, also, has 1

The civic cx, also, has 1 wire o2 sensor, suprise suprise, matt.
SVOboy is offline   Reply With Quote
Old 04-02-2006, 01:20 PM   #14
Driving on E
 
Matt Timion's Avatar
 
Join Date: Sep 2005
Posts: 3,110
Country: United States
Re: The civic cx, also, has 1

Quote:
Originally Posted by SVOboy
The civic cx, also, has 1 wire o2 sensor, suprise suprise, matt.
That really is surprising, really. You would think that HOnda of all people would have upgraded all of their obd1 cars to at LEAST 4 wire o2 sensors. For them to make one exception (on a gas mileage giant nontheless) is a shocker).

Oh well, at least it makes replacements cheaper
Matt Timion is offline   Reply With Quote
Old 04-02-2006, 01:23 PM   #15
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
Since the cx has such a

Since the cx has such a short exhaust manifold I'm sure the o2 heats up quickly enough on its own that a 4 wire was not 100% necessary.
SVOboy is offline   Reply With Quote
Old 04-02-2006, 01:30 PM   #16
Registered Member
 
krousdb's Avatar
 
Join Date: Feb 2006
Posts: 1,480
Country: United States
Location: Myrtle Beach, SC
Re: The Civic CX is a obd1 car,

Quote:
Originally Posted by Matt Timion
If you're on your original o2 sensor, I'd recomment changing it anyway. o2 sensors start working less well after 30k miles. if you're over 100k it's definately going to not work as well.
How about 13 years old but only 45k miles. Could I benefit from a new O2 sensor? Maybe it doesnt matter since the SVO ecu is leaned out already. Hmmm.
__________________


krousdb is offline   Reply With Quote
Old 04-02-2006, 01:33 PM   #17
*shrug*
 
Join Date: Sep 2005
Posts: 6,195
Country: United States
I would test out your o2

I would test out your o2 sensor voltage and see what's up, you never know. Swapping around could always help I say. Get denso or ngk though, bosch o2 sensors in hondas are ****.
SVOboy is offline   Reply With Quote
Old 04-02-2006, 01:42 PM   #18
|V3|2D
 
thisisntjared's Avatar
 
Join Date: Mar 2006
Posts: 1,186
Country: United States
Send a message via AIM to thisisntjared
at that time the cx was

at that time the cx was designed to be economical only, single wire o2 sensor, no bells, no whistles, no sway bars, no aerodynamic panels(lip, rear bumper block), no mudflaps, no acceleration. the vx was intended to be the real fuel saver.

83 octane gas??? that seams kinda rediculous.... anyway how is the ignition timing? fuel filter? also if your planning on cleaning your injectors, do it before. the fuel filter is cheap and easy to replace, so is the o2 if it doesnt break when you try to pull it out. the cat sucks.

EDIT: spark plug wires, how are they?
__________________
don't waste your time or time will waste you
thisisntjared is offline   Reply With Quote
Old 04-02-2006, 06:39 PM   #19
Registered Member
 
Join Date: Nov 2005
Posts: 331
Country: United States
Send a message via MSN to n0rt0npr0
maybe

maybe one of your brake float pins are sticky and causing your brakes to stick and drag.

you did not mention your spark plug wires, they may need to be replaced. (always always replace wires with plugs)

Your clutch may be slipping.

You may have a bad alignment (even tho it may drive straight) if your camber is out of spec, you are losing lots of energy due to the high rolling friction of lots of weight dispursed on the sides of the tread.

You may have lots of extra heavy stuff in your car.

Your tires may be underinflated (common!)
__________________
"You have to know the truth, and seek the truth, and the truth will set you free."
-unknown
n0rt0npr0 is offline   Reply With Quote
Old 04-02-2006, 07:07 PM   #20
Registered Member
 
Join Date: Oct 2005
Posts: 1,978
Country: United States
This is just brainstorming...

Just brainstorming, but do cars get worse mileage at higher altitudes? Depending on your location in MT, you may have less oxygen at your disposal, which could make it sluggish compared to before.

Other routine stuff: PCV valve (shake it, it should sound like a metal ball bouncing in there), air filter and intake should be clear (check for clogs), same for exhaust -- does it rev-up easily, or feel choked off (could be the cat or plugs/wires as mentioned earlier). This is expensive, but the fuel injectors could be giving it up. There's a whole variety, really. I feel like I'm on "Car Talk"...

"What kind of sound does it make?"

Is it burning oil? -- check the tail pipe -- wipe the outlet with a paper towel -- if it's thick/greasy, you probably have an oil burn situation. Normal is carbon-black with some moisture. Track fluids -- if you're losing coolant, it could be a blown head gasket, especially if you have a steam-look coming out of your exhaust in warm weather (like what most cars look like in the cold). Lastly, Matt had a good point about the tire/wheel size -- you're traveling more miles that you think, so you'll have to calculate the change (bigger wheel, longer it takes to complete one revolution, one revolution is used to calculate speed and mileage).

Lastly, I assume you have drum brakes in the rear -- which need adjusted from time to time. One way is to use the E-brake regularly when parking, or drive in reverse quickly and hit the brakes -- they'll auto-adjust.

At this point we can only guess and rely on your descriptions since we we can't see/drive the car.

RH77
__________________

__________________
rh77 is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
new link for Mobile after submit Pontiac Fuelly Web Support and Community News 1 02-07-2009 04:48 AM
Recent Fuel-ups Graph Scale rcsheets Fuelly Web Support and Community News 5 09-08-2008 03:11 AM
Current TV spot merckrx General Fuel Topics 1 08-14-2008 06:36 AM
An American Perspective on Driving in Canada rh77 General Discussion (Off-Topic) 28 03-24-2006 09:42 PM
"active" aero grille slats on 06 civic concept MetroMPG General Fuel Topics 21 01-03-2006 12:02 PM

» Fuelly iOS Apps
Powered by vBadvanced CMPS v3.2.3


All times are GMT -8. The time now is 05:22 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.