Go Back   EcoModder Forum > EcoModding > General Efficiency Discussion
Register Now
 Register Now
 

Reply  Post New Thread
 
Submit Tools LinkBack Thread Tools
Old 10-27-2015, 09:40 PM   #1 (permalink)
EcoModding Lurker
 
Join Date: Oct 2015
Location: Madison
Posts: 21
Thanks: 12
Thanked 0 Times in 0 Posts
98hx only getting 25-28 mpg?!?!?!

I'm the 2nd car owner of this 98 honda civic hx. I bought it with 125,000 miles and now it only has 130,000. I just changed the spark plugs, spark plug wires, distributor cap, oil,oil filter, air filter. Nothing is wrong with the car but a ticking noise from the engine but its not my valves. I just checked them. Shouldn't I be getting over 30mpg easy? I'm going to sea foam and clean my egr up next. Any other advice?

  Reply With Quote
Alt Today
Popular topics

Other popular topics in this forum...

   
Old 10-27-2015, 09:55 PM   #2 (permalink)
...beats walking...
 
Join Date: Jul 2009
Location: .
Posts: 6,190
Thanks: 179
Thanked 1,525 Times in 1,126 Posts
"Ticking" noise might be:

bad rod bearings?
piston slap (especially when cold)?
noisy PCV valve?
valve rocker arm(s) needing adjustment?

You should be getting close to 40mpg highway.
  Reply With Quote
The Following User Says Thank You to gone-ot For This Useful Post:
98civHX (10-27-2015)
Old 10-27-2015, 10:11 PM   #3 (permalink)
EcoModding Lurker
 
Join Date: Oct 2015
Location: Madison
Posts: 21
Thanks: 12
Thanked 0 Times in 0 Posts
I just checked my valve rockers and they're fine. The noise is coming from the engine. I'll check pcv valve and piston slap. I have no idea why I'm not getting good mpg either, I've never driven my car to empty but my gas tank will be half filled when I get close to 150milesof driving.
  Reply With Quote
Old 10-27-2015, 10:14 PM   #4 (permalink)
Master EcoModder
 
Join Date: Aug 2010
Location: Philippines
Posts: 2,173
Thanks: 1,739
Thanked 589 Times in 401 Posts
Only way to find out... fill it to the brim, drive a bit and fill it again (preferably without turning the engine off in the interim) to get your ballpark economy.
  Reply With Quote
The Following User Says Thank You to niky For This Useful Post:
98civHX (10-27-2015)
Old 10-27-2015, 10:21 PM   #5 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,024 Times in 1,304 Posts
Bad:

Thermostat.
Oxygen sensor.
Timing-distributor.
Compression.
Fuel pressure regulator.
Timing belt installed incorrectly.
Brakes dragging.
Plugged converter-exhaust.
Low air pressure in tires.
Dragging brake calipers.
Very short driving distances.
Alignment.
Injectors-ecu fried.

As well multitude of additional potential causes working individually or in conjuction with each other.

Need much more information.

regards
mech
  Reply With Quote
The Following User Says Thank You to user removed For This Useful Post:
98civHX (10-27-2015)
Old 10-27-2015, 10:34 PM   #6 (permalink)
EcoModding Lurker
 
Join Date: Oct 2015
Location: Madison
Posts: 21
Thanks: 12
Thanked 0 Times in 0 Posts
Sorry, I'm in the process of learning how to take care of a car. Just bought a Chilton book about a week ago and have been reading it. Any other advice will be great. How would I know if I have bad rod bearings or if I have psiton slap?
  Reply With Quote
Old 10-27-2015, 11:04 PM   #7 (permalink)
Master EcoModder
 
Join Date: Sep 2009
Posts: 5,927
Thanks: 877
Thanked 2,024 Times in 1,304 Posts
Commute distance?

How easy is the car to push of a flat surface?

Does the temp gauge read in the middle of the range and does it warm up in less than 2 miles in moderate ambient temperatures?

Shift points in rpm?

Engine rpms at 60 mph?

regards
mech
  Reply With Quote
The Following User Says Thank You to user removed For This Useful Post:
98civHX (10-27-2015)
Old 10-27-2015, 11:26 PM   #8 (permalink)
EcoModding Lurker
 
Join Date: Oct 2015
Location: Madison
Posts: 21
Thanks: 12
Thanked 0 Times in 0 Posts
My daily commute is less than 5 miles a day. It takes a while fory car to warm up and it only reaches 1/4 of the way on the thermostat. I shift between 2k-2.5k rpm my rpm @ 60mph is 2.5k or less
  Reply With Quote
Old 10-28-2015, 12:51 AM   #9 (permalink)
Cyborg ECU
 
California98Civic's Avatar
 
Join Date: Mar 2011
Location: Coastal Southern California
Posts: 6,299

Black and Green - '98 Honda Civic DX Coupe
Team Honda
90 day: 66.42 mpg (US)

Black and Red - '00 Nashbar Custom built eBike
90 day: 3671.43 mpg (US)
Thanks: 2,373
Thanked 2,172 Times in 1,469 Posts
Quote:
Originally Posted by 98civHX View Post
Sorry, I'm in the process of learning how to take care of a car. Just bought a Chilton book about a week ago and have been reading it. Any other advice will be great. How would I know if I have bad rod bearings or if I have psiton slap?
You can do way better than the Chilton manual. I can share the 1996-1998 Civic factoy manual (1500 pages) witn you. It is a big file, but if you PM me with a gmail account or something, I'll try to email it to you. Among other things, it has useful trouble shooting flow charts and such.
__________________
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.



  Reply With Quote
The Following User Says Thank You to California98Civic For This Useful Post:
98civHX (10-28-2015)
Old 10-28-2015, 12:56 AM   #10 (permalink)
EcoModding Lurker
 
Join Date: Oct 2015
Location: Madison
Posts: 21
Thanks: 12
Thanked 0 Times in 0 Posts
Xxxxxxxxxx@xxxxxxxx ^ when I reply do you guys get notifications? I'm new to this site so I'm not sure if you guys are getting my responses.


Last edited by BabyDiesel; 10-28-2015 at 01:41 PM.. Reason: Sensitive information
  Reply With Quote
Reply  Post New Thread






Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Content Relevant URLs by vBSEO 3.5.2
All content copyright EcoModder.com