Question about Honda VTX 1800 Motorcycles

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2000 vtx 1800r running rich at idle...spark plugs black with soot.

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Check out this forum for some good tech info on the VTX
http://www.vtxoa.com/

If you have been running high octane gas, it will foul the plugs on a VTX. They run cleaner on low octane fuel.

also the choke has a tendancy on some of these bikes to move out, so make sure it seats all the way down.

Posted on Jan 06, 2011

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Have you changed the oil lately? If there is to much oil in the motor the bike will push oil up into the airbox and foul the air filter out. This will cause the bike to run rich. check the oil level and then drain any excess out to the proper level. You will need to clean or replace the air filter in order to make the bike run well.
Steve

Posted on Jan 02, 2011

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1 Answer

00 honda passport intermittent rough idle


called misfire.
that means its not holding closed loop status at idle
ever do a tune up on it?
old spark plugs dont work, they MISFIRE and idle fails.
all cars for 100 years ,same , gas engines.

it can also be, bad fueling. or a bad engine.
we check compression first
then spark then fueling;
in that order, engine can not run right out of that order.
so misfire.
too rich misfire.
or too lean.
we check that by gazing at the spark plug tips ,
black is rich, white is lean.
most cars are cream or very light tan color. normal.
learn to read the spark plug tips.

its and 2000, and the scan tool will show the car is not i closed loop
at idle, fix that first. and DTC errors like MISFIRE P0300 or bad idle.
the same scan too show LTFT, long term fuel trim.
if its way far from 0 , the fueling is wrong.
-3-5% is normal. -50 is stuck rich and misfiring.

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Audi a3 1.8 non turbo 1999. car idles very ruff, i changed the spark plugs with the last service last week. could this be a faulty spark plug? it has a very rich fuel smell, when idling


A rough idle can be due to poor timing./fuel tuning.So an examination of the spark plug will give the indication of the firing of all the cylinders with which we can confirm . If the spark plugs are burnt then the fuel mixture is good but if there is a black soot or soggy smear then the fuel settings are high or the spark intensity is low.
So you need to check on the fuel pressure-- have the pump calibrated .
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Backfiring on deceleration from exhaust pipes


May be running too lean or too rich. Check the color of your plugs, black dry and sooty means they are rich, white with blisters lean.

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My spark plugs seem to soot up, is the mixture wrong. will the jets need setting. i have a heritage classic year 2000


Yeah the mixture is too rich.Didn't say but are both plugs sooty?Anyway,if jets have been ok then all they could be is dirty and you'd have other problems.Take air cleaner off and make sure choke plate is fully open with choke lever off.Adjust all the fuel/air screws for proper idle and throttle response.Check voltage of spark from coil.Then try differant heat ranges in plugs to get hotter fire.Just a thought.Are you sure it's soot and not oil residue?Oh yeah,when you have new plugs in before you fire it up wipe out the ends of the pipes,real clean.Then after it runs awhile look at the pipes.Sooty? gray?black?Gray or lite tan is best.Try heat ranges til you're happy.

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Vehicle smells like gas both inside and out of car after engine is off. Check Engine light is on but no noted deficiences noticed, all fluid levels good. what could be the problem?


If your check engine light is on when the car is running, then that means there is probably a trouble code stored in your vehicles computer. With a code reader, you can find out what the code is. That will direct you to the problem. You can post your code here and we will tell you what it means.
Regarding the 'gas' smell, first check to see if your car is running 'rich'. You can rub your finger inside the tailpipe and see if there is a lot of black soot there, which would indicate its running too rich (too high of a fuel to air mixture). If this is inconclusive to you, remove the spark plugs and check if they are with black soot on them where the pin is. This will tell you how the engine is running in terms of fuel mixture. If they are black, then you have found the problem (fuel injection problem or Oxygen sensor, most likely). The trouble code might also point to this. Other than that, sometimes an exhaust leak can cause fumes to leak up into the car when running. My car had the gas smell problem and it was both a hole in the exhaust under the car and an overly rich fuel mixture. I had black soot inside the tailpipe and black sooty spark plugs and the final problem ended up being a bad oxygen sensor (located on the intake manifold), that was sending an improper signal to the vehicle's computer, thus the reason for the problem.

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