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Old 10-27-2015, 09:40 PM   #1 (permalink)
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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?

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Old 10-27-2015, 09:55 PM   #2 (permalink)
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"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.
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Old 10-27-2015, 10:11 PM   #3 (permalink)
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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.
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Old 10-27-2015, 10:14 PM   #4 (permalink)
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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.
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Old 10-27-2015, 10:21 PM   #5 (permalink)
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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
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Old 10-27-2015, 10:34 PM   #6 (permalink)
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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?
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Old 10-27-2015, 11:04 PM   #7 (permalink)
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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?

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Old 10-27-2015, 11:26 PM   #8 (permalink)
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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
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Old 10-28-2015, 12:51 AM   #9 (permalink)
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Black and Green - '98 Honda Civic DX Coupe
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90 day: 66.42 mpg (US)

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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.



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Old 10-28-2015, 12:56 AM   #10 (permalink)
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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.


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