Go Back   Honda Civic Forum > Honda Civics by Generation > 7th Gen > Mechanical Problems/Vehicle Issues and Fix-it Forum
Register Forgot Password?

Mechanical Problems/Vehicle Issues and Fix-it Forum If you've got a problem you just can't figure out, a noise you can't diagnose, or a Check Engine Light that won't go away, ask about it here!

Welcome to civicforums.com!
Welcome to civicforums.com.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to start new topics, reply to conversations, privately message other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, so please join civicforums.com today!



Reply
 
 
 
 
LinkBack Thread Tools Search this Thread
Old 12-20-2010   #1
Registered!!
 
Join Date: Nov 2009
Posts: 6
iTrader: (0)
Rep Power: 0
Drumer56 is an unknown quantity at this point
2001 Honda Civic LX Poor Fuel Economy

Hello i've got a 2001 Honda Civic LX Automatic Sedan and i've been getting really poor gas mileage. I reset the odometer every time i fill up and for the past couple of months i've been getting about 20 mpg on average. Would changing the spark plugs or changing the fuel filter help with the mpg? Fuel injector cleaner?

Ive got about 200 pounds of audio equipment in the trunk but other then that and myself my car has no additional weight. Nothing aftermarket on my car other then a K&N air filter and a 2 Inch cat back exhaust which i would think would help with my mpg. Any help is appreciated i want to get my civic back up to doing 25+ mpg.

Thanks

EDIT: about 110,000 miles on the car

Last edited by Drumer56; 12-20-2010 at 01:45 PM.
Drumer56 is offline   Reply With Quote
Old 12-22-2010   #2
Registered!!
 
Join Date: Dec 2010
Posts: 2
iTrader: (0)
Rep Power: 0
stoney13 is an unknown quantity at this point
Re: 2001 Honda Civic LX Poor Fuel Economy

Hey man I have your same problem. I drive an EX though but im sure what im trying to do is gonna be the same. I also have about 120,000 miles on the car. I also have an audio system and for a while my mileage was great but then it went from 400+ on a tank even when I was flooring it and now its getting about 250-300 miles to a tank.

I had a check engine light that wanted me to replace my downstream o2 sensor. Plus my catalytic converter was shot. So i replaced the new cat with a magnaflow direct replacement cat and a denso o2 sensor. Light was still on and mileage is still terrible. Talking with a friend he said the light will stay on until I replace the new o2 sensor with a honda one. It wont go off unless I do that and he said it was gonna be around $125, not looking forward to that. I even have an AEM V2 CAI plus Helix TBS. Plus I changed my brake pads cause they were bad and I changed my oil and oil filter. Still terrible mileage.

I talked to a friend who is a master mechanic specializing in diagnostics. He suggested to check the spark plugs and fuel filter (because if that is clogged then not enough fuel would be getting to the engine) after I explained what I had done to the vehicle. So I put it on the rack at a buddies shop and rotated and balanced the tires while my buddy was busy. I didnt have time to check the plugs or fuel filter because I noticed I was leaking brake fluid out the reservoir so I got side tracked.

Once I buy a new fuel filter and replace it, get the alignment correct, + check the plugs I will let you know if that solves anything. But it is annoying to keep filling up twice as often now. Its raping my account.

Last edited by stoney13; 12-22-2010 at 11:40 PM.
stoney13 is offline   Reply With Quote
Old 12-23-2010   #3
Live for the Twisties
Administrator


 
MindBomber's Avatar
 
Join Date: Jun 2010
Location: Langley, BC
Posts: 8,574
Points: 31,330, Level: 100
Points: 31,330, Level: 100 Points: 31,330, Level: 100 Points: 31,330, Level: 100
Level up: 0%, 0 Points needed
Level up: 0% Level up: 0% Level up: 0%
Activity: 7.1%
Activity: 7.1% Activity: 7.1% Activity: 7.1%
iTrader: (0)
Rep Power: 146
MindBomber has much to be proud of MindBomber has much to be proud of MindBomber has much to be proud of MindBomber has much to be proud of MindBomber has much to be proud of MindBomber has much to be proud of MindBomber has much to be proud of MindBomber has much to be proud of MindBomber has much to be proud of MindBomber has much to be proud of MindBomber has much to be proud of
Re: 2001 Honda Civic LX Poor Fuel Economy

The intake and exhaust will cause slight drops in HP and fuel efficiency, all they will do is make your car louder. The extra weight and drain on the battery from the audio equipment will also have an impact on fuel efficiency.The fuel filter is not a wear item in 7th gen civics, it should last the life of the car without causing a drop in mileage. I get the best fuel efficiency from Shell V-Power gas, although some people prefer Chevron w/ Techron, any other gas station gives me significantly worse mileage. I would recommend you each go through Gearbox's forgotten tune-up mod DIY, if you do everything on the list you should have a fairly significant increase in fuel efficiency.
DIY: forgotten tune-up mods
MindBomber is offline   Reply With Quote
Old 12-23-2010   #4
Administrator
Hey! Look At Me!! I'm a Supporting Member!!
Administrator

 
TRIZ's Avatar
 
Join Date: Aug 2006
Location: Portland, Oregon
Age: 29
Posts: 8,276
Points: 135,443, Level: 100
Points: 135,443, Level: 100 Points: 135,443, Level: 100 Points: 135,443, Level: 100
Level up: 0%, 0 Points needed
Level up: 0% Level up: 0% Level up: 0%
Activity: 9.0%
Activity: 9.0% Activity: 9.0% Activity: 9.0%
iTrader: (14)
Rep Power: 249
TRIZ Ownz Erthang TRIZ Ownz Erthang TRIZ Ownz Erthang TRIZ Ownz Erthang TRIZ Ownz Erthang TRIZ Ownz Erthang TRIZ Ownz Erthang TRIZ Ownz Erthang TRIZ Ownz Erthang TRIZ Ownz Erthang TRIZ Ownz Erthang
Send a message via AIM to TRIZ
Re: 2001 Honda Civic LX Poor Fuel Economy

Disconnect the audio equipment for at least 2 fillups and see how much of a huge difference that makes. 200lbs is a lot of needless weight.

Get your tires back up to the correct pressure too.

And I second doing gearbox's forgotten tune up mods.
TRIZ is offline   Reply With Quote
Old 04-12-2011   #5
Registered!!


 
Join Date: Mar 2011
Posts: 10
Points: 1,180, Level: 18
Points: 1,180, Level: 18 Points: 1,180, Level: 18 Points: 1,180, Level: 18
Level up: 80%, 20 Points needed
Level up: 80% Level up: 80% Level up: 80%
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
iTrader: (0)
Rep Power: 0
jim1123us is an unknown quantity at this point
Re: 2001 Honda Civic LX Poor Fuel Economy

I have an 02 Civic EX AT with 72K on it and have a bunch of problems with it which started with a drastic drop in MPGs ( 30+ dropped to 16ish) so I thought I would post here first. I started out by doing a quick tune up, denso IK20 plugs and new air filter. Shortly after doing that the car threw a 0420 code ( CAT low efficiency). The car started to loose significant power - up hills it cannot maintain 30mph. I replaced the primary 02 sensor and did Gearbox's forgotten tune up. The CEL has not come back since, but the car drives no better. The engine revs just fine while parked but climbing hills it responds very slowly. Once the RPM climb the car doesn't shift until about 4K.
What I'm thinking is either clogged CAT, or transmission issue. Ideas? Any help would be great. The car is pretty much un-drivable now.
jim1123us is offline   Reply With Quote
Old 04-12-2011   #6
Registered!!

 
Join Date: Feb 2011
Location: Midwest
Posts: 446
Points: 4,862, Level: 44
Points: 4,862, Level: 44 Points: 4,862, Level: 44 Points: 4,862, Level: 44
Level up: 56%, 88 Points needed
Level up: 56% Level up: 56% Level up: 56%
Activity: 5.0%
Activity: 5.0% Activity: 5.0% Activity: 5.0%
iTrader: (0)
Rep Power: 51
got2run5 will become famous soon enough got2run5 will become famous soon enough
Re: 2001 Honda Civic LX Poor Fuel Economy

Check to make sure you don't have a crack in your exhaust manifold. It is VERY common on this gen of civic. I have a crack in mine right now (gonna b replaced soon) and it dropped my mpg by 5 mpg. The crack makes the 02 sensor read wrong and dump more gas in. Pull off the exhaust manifold cover (a few tight bolts) and inspect for even hairline cracks.
got2run5 is offline   Reply With Quote
Old 04-12-2011   #7
Moderator



 
sdaidoji's Avatar
 
Join Date: Dec 2008
Location: TN
Age: 43
Posts: 6,168
Points: 25,390, Level: 96
Points: 25,390, Level: 96 Points: 25,390, Level: 96 Points: 25,390, Level: 96
Level up: 4%, 960 Points needed
Level up: 4% Level up: 4% Level up: 4%
Activity: 99.7%
Activity: 99.7% Activity: 99.7% Activity: 99.7%
iTrader: (1)
Rep Power: 137
sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold
sandro daidoji
Send a message via ICQ to sdaidoji Send a message via Yahoo to sdaidoji
Re: 2001 Honda Civic LX Poor Fuel Economy

sounds more like cat
__________________

02 Coupe EX
suspension basics, Engine codes - To read, not to ask, Honda swap 101, VTEC head swap, Chassis code?, EX header?, cam?
Quote:
Originally Posted by Poopies View Post
I get the broke thing, but what does being female have to do with anything? We'd help you out if you were a lawn gnome as long as you asked us nicely!
sdaidoji is offline   Reply With Quote
Old 04-12-2011   #8
Registered!!


 
Join Date: Mar 2011
Posts: 10
Points: 1,180, Level: 18
Points: 1,180, Level: 18 Points: 1,180, Level: 18 Points: 1,180, Level: 18
Level up: 80%, 20 Points needed
Level up: 80% Level up: 80% Level up: 80%
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
iTrader: (0)
Rep Power: 0
jim1123us is an unknown quantity at this point
Re: 2001 Honda Civic LX Poor Fuel Economy

gotrun5 - I'll take a look at the exhaust manifold. Would I hear the leak if it was cracked ( I didn't notice any hiss)? easy enough to check.

sdaidoji - Any easy way to check the CAT?
jim1123us is offline   Reply With Quote
Old 04-12-2011   #9
Moderator



 
sdaidoji's Avatar
 
Join Date: Dec 2008
Location: TN
Age: 43
Posts: 6,168
Points: 25,390, Level: 96
Points: 25,390, Level: 96 Points: 25,390, Level: 96 Points: 25,390, Level: 96
Level up: 4%, 960 Points needed
Level up: 4% Level up: 4% Level up: 4%
Activity: 99.7%
Activity: 99.7% Activity: 99.7% Activity: 99.7%
iTrader: (1)
Rep Power: 137
sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold
sandro daidoji
Send a message via ICQ to sdaidoji Send a message via Yahoo to sdaidoji
Re: 2001 Honda Civic LX Poor Fuel Economy

not that i know of... exhaust shop?
__________________

02 Coupe EX
suspension basics, Engine codes - To read, not to ask, Honda swap 101, VTEC head swap, Chassis code?, EX header?, cam?
Quote:
Originally Posted by Poopies View Post
I get the broke thing, but what does being female have to do with anything? We'd help you out if you were a lawn gnome as long as you asked us nicely!
sdaidoji is offline   Reply With Quote
Old 04-12-2011   #10
Registered!!


 
Join Date: Mar 2011
Posts: 10
Points: 1,180, Level: 18
Points: 1,180, Level: 18 Points: 1,180, Level: 18 Points: 1,180, Level: 18
Level up: 80%, 20 Points needed
Level up: 80% Level up: 80% Level up: 80%
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
iTrader: (0)
Rep Power: 0
jim1123us is an unknown quantity at this point
Re: 2001 Honda Civic LX Poor Fuel Economy

I tried to see what the temperature was across the Cat right after a test drive with my infared temperature sensor but the downstream side was beyond the range (>680 deg F). After a minute the downstream side was about 250 deg hotter than the up stream side. From what I've read here that is high. The cat was not glowing however. Maybe I'll try to drop it this weekend and see if is blocked.
jim1123us is offline   Reply With Quote
Old 04-13-2011   #11
Registered!!


 
Join Date: Mar 2011
Posts: 10
Points: 1,180, Level: 18
Points: 1,180, Level: 18 Points: 1,180, Level: 18 Points: 1,180, Level: 18
Level up: 80%, 20 Points needed
Level up: 80% Level up: 80% Level up: 80%
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
iTrader: (0)
Rep Power: 0
jim1123us is an unknown quantity at this point
Re: 2001 Honda Civic LX Poor Fuel Economy

Ok I pulled the exhaust manifold cover last night and saw no sign of cracks. I'll try to check the cat this weekend.

Anyone want to weigh in on the possibility that this is a transmission problem? Do the symptoms sound like classic 7th gen 2nd clutch issue?
jim1123us is offline   Reply With Quote
Old 04-19-2011   #12
Registered!!

 
Join Date: Feb 2011
Location: Midwest
Posts: 446
Points: 4,862, Level: 44
Points: 4,862, Level: 44 Points: 4,862, Level: 44 Points: 4,862, Level: 44
Level up: 56%, 88 Points needed
Level up: 56% Level up: 56% Level up: 56%
Activity: 5.0%
Activity: 5.0% Activity: 5.0% Activity: 5.0%
iTrader: (0)
Rep Power: 51
got2run5 will become famous soon enough got2run5 will become famous soon enough
Re: 2001 Honda Civic LX Poor Fuel Economy

Sorry for taking so long to get back--you might not notice a crack. It can be pretty small and in hard to reach areas. But chances are you would hear a clicking (in my case) when accelerating hard (like at 4000 rpms and up) and I know some people hear a hissing sound.
got2run5 is offline   Reply With Quote
Old 04-20-2011   #13
Registered!!


 
Join Date: Mar 2011
Posts: 10
Points: 1,180, Level: 18
Points: 1,180, Level: 18 Points: 1,180, Level: 18 Points: 1,180, Level: 18
Level up: 80%, 20 Points needed
Level up: 80% Level up: 80% Level up: 80%
Activity: 0%
Activity: 0% Activity: 0% Activity: 0%
iTrader: (0)
Rep Power: 0
jim1123us is an unknown quantity at this point
Re: 2001 Honda Civic LX Poor Fuel Economy

hey guys - problem solved. It was the cat. sdaidoji gets the prize. I had it replaced today and the car runs like new. Shop said it was pretty plugged up. Thanks for your help.

Jim
jim1123us is offline   Reply With Quote
Old 04-20-2011   #14
Moderator



 
sdaidoji's Avatar
 
Join Date: Dec 2008
Location: TN
Age: 43
Posts: 6,168
Points: 25,390, Level: 96
Points: 25,390, Level: 96 Points: 25,390, Level: 96 Points: 25,390, Level: 96
Level up: 4%, 960 Points needed
Level up: 4% Level up: 4% Level up: 4%
Activity: 99.7%
Activity: 99.7% Activity: 99.7% Activity: 99.7%
iTrader: (1)
Rep Power: 137
sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold sdaidoji is a splendid one to behold
sandro daidoji
Send a message via ICQ to sdaidoji Send a message via Yahoo to sdaidoji
Re: 2001 Honda Civic LX Poor Fuel Economy

pheeew!
Good to know it was solved!
__________________

02 Coupe EX
suspension basics, Engine codes - To read, not to ask, Honda swap 101, VTEC head swap, Chassis code?, EX header?, cam?
Quote:
Originally Posted by Poopies View Post
I get the broke thing, but what does being female have to do with anything? We'd help you out if you were a lawn gnome as long as you asked us nicely!
sdaidoji is offline   Reply With Quote
Old 04-20-2011
CivicForums
Honda Civic




Paid Advertisement
 
 
 
Reply


Tags
02 , 2001 , 2006 , cat , civic , downstream , drop , fuel , gas , honda , lines , lx , mileage , mpg , o2 , poor , pre , sensor , sensors , substantial , tune

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 On
Pingbacks are On
Refbacks are On

  
User Login
Our Partners


used new
Top 10 Threads
Maintenance required light
Who's had a bad transmission? *UPDATED*
Is your Check Engine Light, SRS Light, Or ABS Light On? If so, Please Read
P0135 O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
Your answer may be here! TSB / Honda Complaint Address / Etc...
DRL Problem
If you have idle issues look here before posting!!!
Overheating common causes - reference
DIY: replacing power window motor assembly on my civic coupe
Replacement Key Immobilizer Programming


All times are GMT -5. The time now is 10:55 PM.

   
Advertising - Privacy Statement - Terms of Service - Jobs
Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
All Content Copyright 2007 CivicForums.com
Emails Backup