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Old 01-11-2018, 08:17 PM   #1 (permalink)
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Sipper - '98 Honda Civic HX
90 day: 40.14 mpg (US)
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Base line results for 322,000 mile 98 Honda HX 5 speed

38.98mpg

Not a bad start. First goal, 40mpg, should be doable, will make a few small changes this weekend, top it off and see where this next tank of fuel puts me. I'll post pictures and details in this thread later this week.

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Old 01-11-2018, 08:17 PM   #2 (permalink)
Ol' Skooler
 
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Beater Echo - '00 Toyota Echo
Team Toyota
90 day: 42.67 mpg (US)

Hondizzle - '97 Honda Civic DX
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90 day: 48.06 mpg (US)
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What's your commute like?
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'97 Honda Civic DX Coupe 5MT
'00 Echo - dead 2/17
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Old 01-11-2018, 08:34 PM   #3 (permalink)
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Sipper - '98 Honda Civic HX
90 day: 40.14 mpg (US)
Thanks: 14
Thanked 13 Times in 12 Posts
A good many elevation changes and corners the whole way just about from my rural location into the city of Athens. It's mostly "highway" miles. I'm very good at timing lights properly to keep momentum as well.

With winter weather, wet roads and unknown tire pressure, the accelerator pedal issue, possible coolant sensors reading low (gauge seems to anyway not sure the engines actually over cooled but I have my suspicions given the amount of time it takes to get hot air from the heater seems a bit longer than it ought to be) indicating that perhaps the thermostat has either been removed (that's stupid) changed to a lower temp (also stupid) or stuck in a open state and a few other very minor things I think that number can easily come up some, especially this summer.

Stopped today at the local parts store and had them scan the ECU for codes, clean no codes. Excellent. (there was no CEL but sometimes minor codes don't seem to throw a CEL so I wanted to check anyway)

Last edited by DSMHondaGuy; 01-11-2018 at 10:11 PM..
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Old 01-12-2018, 12:07 AM   #4 (permalink)
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Location: Coastal Southern California
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Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 61.47 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
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Very nice. I have a 98 DX with 255,000 miles. You'll get wy higher numbers than 38 if you keep to it. Great little go boxes, these old Civics.
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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Old 01-12-2018, 03:09 AM   #5 (permalink)
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Location: Mesa, AZ
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Chorizo - '00 Honda Civic HX, baby! :D
90 day: 34.82 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 37.34 mpg (US)
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Do you have a Fumoto Quickvalve? My oil pan stripped the first time I changed the oil. I replaced the pan and installed a Quickvalve. I can pull the filter from above and drain the oil without tools. I cannot imagine oil changes being easier.

Replacing the oil pan was a chore, though. The torque specs of aluminum is not much lower than steel, but I have stripped two aluminum bolt holes while trying to be careful. I have not stripped any steel holes.

The oxygen sensors are prone to failure. Everyone says that only the factory sensors work and they are expensive, but you can find them for less than Honda charges.

I do not know that it is common with Civics, particularly HXes, but mine has low compression, and as far as I know, it did when I bought the car at 170,000 miles. That is pretty easy to check.

We always encourage instrumentation, which is more difficult with lean burn, but a $5 bluetooth OBD-II dongle and an old phone, or a cheap pre-paid one, can give you a wealth of information, plus you can read your own CELs. If you want to monitor your fuel economy, you need an MPGuino.

At some point I recommend removing the power steering belt, driving a tank, and then putting it back, so you can see if there is any difference. I removed my power steering and the extra effort when stopped does not bother me. It is supposed to provide a barely-measurable increase to power and fuel economy.

I love the HX wheels, but it would benefit from smooth wheel covers. Other members favor coroplast circles or pizza pans. I think pizza separators look better, but I did not like my attachment method. You could also put fiberglass resin on a cardboard circle.

I screwed a rolled-plastic air dam and grill block onto my front bumper, but I like Metro's air dam for his Miata better. He figured out how to attach it without putting holes in his car.

At what speed do you drive? If lean burn works, you should get better fuel economy at 65 MPH than 55. For some reason, I did not think my lean burn worked, so I drove 55 for a year or two. Then I drove 65 for a tank and had a definite improvement. Talk about regret!

I also saw a big improvement cleaning out my EGR passages, although my long-term data was confusing.

Daox sells shifter knobs with built-in kill switch buttons. He has different versions with more buttons, too.

Welcome and good luck!
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Old 01-12-2018, 05:45 AM   #6 (permalink)
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Sipper - '98 Honda Civic HX
90 day: 40.14 mpg (US)
Thanks: 14
Thanked 13 Times in 12 Posts
I didn't know one of the criteria for it to go into lean burn mode was vehicle speed, I just figured it was based on throttle and engine load. Well I guess I may get to work a little faster today.

I have a compression gauge so I may get around to checking the compression this weekend as well, I have a Haynes manual for the car which shows for the SOHC D16Y5 engine "standard" compression (new) should be 184psi, minimum spec is 135psi.

Last edited by DSMHondaGuy; 01-12-2018 at 05:55 AM..
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Old 01-12-2018, 10:01 AM   #7 (permalink)
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Posts: 6,409

Chorizo - '00 Honda Civic HX, baby! :D
90 day: 34.82 mpg (US)

Mid-Life Crisis Fighter - '99 Honda Accord LX
90 day: 37.34 mpg (US)
Thanks: 3,703
Thanked 1,149 Times in 859 Posts
I am sorry, I cannot find the information now, but as I recall, lean burn requires the engine be a certain temperature, and a certain RPM range.
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Old 01-12-2018, 10:09 AM   #8 (permalink)
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Sipper - '98 Honda Civic HX
90 day: 40.14 mpg (US)
Thanks: 14
Thanked 13 Times in 12 Posts
I'll have to look into that.

Considering looking for a wideband capable of reading very lean mixtures, that or one of the scan tools that can tell me when the cars in lean burn mode.
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Old 01-12-2018, 04:34 PM   #9 (permalink)
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Join Date: Mar 2011
Location: Coastal Southern California
Posts: 4,773

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 61.47 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 1,650
Thanked 1,352 Times in 921 Posts
Two good threads on how HX lean burn works:

http://ecomodder.com/forum/showthrea...urn-31626.html

http://ecomodder.com/forum/showthrea...how-24948.html
__________________


See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.

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Old 01-12-2018, 06:45 PM   #10 (permalink)
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Sipper - '98 Honda Civic HX
90 day: 40.14 mpg (US)
Thanks: 14
Thanked 13 Times in 12 Posts
Thank you for posting that, the first one gave most if not all of the information I was looking for.

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