Question about 2003 Honda VTX

1 Answer

Only getting 20 to 26 miles per gallon. Usually gets 29 to 31. Replaced fuel pressure regulator, spark plug wires. Useing power commander and bike runs good but low miles per gallon?

Posted by on


1 Answer

  • Level 1:

    An expert who has achieved level 1.


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Contributor
  • 22 Answers

You don't say how many miles you have on the bike or if you replaced fuel filter at the same time or sparkplugs too..How is the aircleaner ? Do you use choke a lot.VTX's seem to be touchy if the choke is over used.How about the aftermarket power commander.Are you running factory pipes.Let that baby breath Remember the engine is a pump The idea is to get the right ratio of air and fuel in and allow enough discharge orexhaust toget out..Hope this is a little help

Posted on Dec 31, 2010

  • cm411 Jan 01, 2011

    The bike has Vance and Hynes pipes and an air cleaner open to the air. And doesn't make a difference if cleaner is mounted of not. The ingine is fuel injected/no choke. The Power Commander was original from the manufacturer. Recently when the turn the bike off, I hear a gurgeling sound like fluid equalizing or some thing. The PC was set with the original map for VH and a 1800cc VTX. It runs smoothly from idle to high speed. But plugs blacken and mileage has dropped about 5mpg. Plug life has always been very low from time I bought the bike with 2000 miles on it. So, thoughts are a bad ECM and or oil getting into the combustion chamber. Or a bad senson, temperature or barometric pressure. Really stumped.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

I changed my fuel pressure regulator in my 92 sedan deville and now i get worse miles per gallon than before

the fuel pressure regulator will not do it. you need to look at spark plugs ,wires ,air filter, fuel filter. tires pressure if tires are under pressure can cause bad gas mpg

Jan 23, 2013 | 1992 Cadillac DeVille

2 Answers

Was geting 18 miles to the gallon now geting 14 it the fuel pump or the air felter. and it had a tune up.

A tune up can reduce mileage. If they set the timing perfectly, that could reduce power and waste gas. You get the most mileage and power if the ignition is advanced as much as possible, until you get a pre-ignition ping in hard 2nd gear acceleration. They you know you have to back off a bit.
Fuel pump should get weaker with age, so should not cause worse mileage.
Air filter has much more effect on a carburetor, and little on a fuel injected car. But why not change it anyway?
If it idles rough, I would suspect a plug wire.

Dec 20, 2010 | Ford Five Hundred Cars & Trucks

2 Answers

Ford F150 engine backfiring, running/idling rough

I Have a 1999 ford f150 4.6 that back fires and is just running really ruff when idling alot of nack fire a sord of like a pulse going on what is my problem?

Apr 16, 2010 | Ford F-150 Cars & Trucks

1 Answer

I have a 1999 wrangler and it tops out at 55 miles per hour but it doesnt mis and runs great around town

Top speed on a wrangler is typically about 15 miles faster than what you are getting. Check the air pressure, air filter, spark plugs and fuel filter. If all of these are good your carbeurator may be partially blocked. Begin with a fuel additive that will clean your carbeurator. I have had success with a product called seafoam which you add to your gas tank at a rate of one ounce per gallon of fuel. Use it for a couple of fuel tanks full of gas.

Jul 18, 2009 | 1997 Jeep Tj

1 Answer


Have you changed the fuel filter? I know it sounds weird but a plugged filter will make a truck use more gas. The computer tries to compensate for less fuel by commanding the injectors to open longer. Also a plugged filter will cause excess back pressure on the fuel pump making it loud.. Good Luck.

May 29, 2009 | 2001 GMC Sonoma Extended Cab

1 Answer

2004 Honda Civic Hybrid. I drive the same route of 300 miles on the interstate 2 or more times a month. I drive the same speed each time at the posted speed limit which varies from 65- 70 miles/hour. I...

First things I would look at is,did they put 10w30 oil in and not 5w20 or 0w20,it makes a difference in mileage (if they run out of the correct viscosity oil they WILL put in what they have).
Did the service include a spark plug change?Is the spark plug gap correct?
Did they do a brake service?Is a brake dragging,a little to tight?Did they clean the throttle body?Maybe the engine was running a little lean before and now is at the proper fuel mixture,with less MPGs but running clean at the exhaust.
Weather conditions?Head winds and colder temps reduce MPG.

May 23, 2017 | 2004 Honda Civic

2 Answers

Loss of power

Do you know how check if every cilinder is working? with the engine in idle, go to the distribuitor cap and carefully unplug one at the time, every cilinder spark plug wire,in the cilinder you dont see a diference in rpm variation, that cilinder is not working, replace spark plug, if you see spark jumping fron the distribuitor cap torch the spark plug wire, another cause to a cilinder fail could be a loss of compression in one or more cilinder

Oct 29, 2008 | 1994 Toyota Pickup

1 Answer

I have 2000 tow car. just recently change sparks plugs,for wee or two i get good gas miles. around 23, 24 miles per gallon on highway, then all off sudden i start getting 18,19 miles per gallon on highway...

Check the torque on your plugs, should be around 15 - 19 lbs - consult spark plug manufacturer on the torque - if you did not torque them enough, they may have become loose. Also check coil packs - make sure all plug wires are snug.

Jul 28, 2008 | 1999 Lincoln Town Car

Not finding what you are looking for?
2003 Honda VTX Logo

140 people viewed this question

Ask a Question

Usually answered in minutes!

Top Honda Experts

Arnie Burke
Arnie Burke

Level 3 Expert

4536 Answers


Level 3 Expert

76846 Answers


Level 2 Expert

342 Answers

Are you a Honda Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides