Bogging,stalling 2002

Discussion in '6th Generation 2002-2013' started by Tim_Singer, Mar 20, 2003.

  1. Tim_Singer

    Tim_Singer New Member

    Joined:
    Mar 20, 2003
    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    0
    ??? I am seeking information for what feels like a fuel injection cutting out problem. The bike will feel like its losing power and the throttle becomes of little use. It will stall if clutch is disengaged. If you are going fast enough when it happens it may cut back in. Also sometimes it just loses a bit of power. In all these events, turning off the engine and cycling the key will remedy the problem until it happens again at any given time. Anybody Heard of ThIS! It makes me nervous to ride long distances. PLease give me some ideas. Maybe its a O2 sensor problem. Maybe you can point me in a new direction.
     
  2. ScootR

    ScootR New Member

    Joined:
    Mar 17, 2003
    Messages:
    16
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    Boerne, Texas
    Has your FI lite come on at all ? If so ,check for fault codes. It can't be O2 sensors as my bike runs fine w/o
    any. Sounds like a fuel delivery problem as you must be
    getting air and engine doesn't completely die as it would
    if it was an electrical problem. You may also want to check the plugs and alternator output voltage.
     
  3. Guest

    Guest Guest

    Hey Tim - can you be a bit more specific? Are you experiencing the various well documented EPA driven fuel map glitches/hesitations or is you bike actually turning off while riding it? I ask because we have serveral "mods" for the former - and the latter could be a serious problem. What year VFR do you have?

    Hey Scooter - good to see your tag line again - so this is where you're hiding out now ;)

    later - brad aka Interceptor aka RedRte1
     
  4. Jozef

    Jozef New Member

    Joined:
    Feb 9, 2003
    Messages:
    11
    Likes Received:
    0
    Trophy Points:
    0
    Very difficult to tell what's going on by your descriptions, does it just "feel' like it's losing power or is the engine actually losing rpm? Not sure what you mean by stalling when the clutch is disengaged, does the engine stop running? If so it was probably already shut down and you were engine braking on a dead engine already. If your engine is actually shutting down I doubt it is O2 sensor related but the following helps understand O2 sensor problems.

    Here's some O2 sensor lore. In the mid-eighties when Ford was first putting fuel injection in cars they had O2 sensor problems that went like this. At any engine speed the engine would suddenly return to idle, if idling it would not gain rpm. You could shut the vehicle down, let it sit for about ten minutes and you could drive off until it happened again. Turned out that the O2 sensor was sending a signal to the computer that the mixture was too rich. When put on diagnostic checks everything would show fine. It took Ford about a year to figure the problem out. Why? because just like on your VFR the diagnostic doesn't check if the O2 sensor is functioning correctly, it only checks that the circuit is there. O2 sensor eliminators just complete the circuit to shut the EFM light off, nothing more. If an O2 sensor is malfunctioning you will never know it without 1, removing the sensor (don't worry about the light it won't hurt anything for this check) or 2. replacing the sensor and see if the problem goes away (assuming it is not replaced with another bad sensor!). An O2 sensor works properly at only a certain preset RPM and temperature combination, they can malfunction at any time or temperature. When an O2 sensor malfunctions you can get lean surging or in the worst case the computer will go to the default idle setting. Sometimes they fail allowing too rich a mixture but I don't think that's a concern unless we have to begin testing bikes for emissions. O2 sensor failure is rare these days but can happen.
     
  5. Zeke

    Zeke New Member

    Joined:
    Apr 6, 2003
    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    palmyra N.j.
    Map
    My bike was stalling every time I disengaged the clucth to shift. This was on the ride home when I purchased it! I just turned the idle up to about a 1000rpms and I haven't had a problem since. hope this helps.
     
  6. Guest

    Guest Guest

    From the factory your idle speed should be set between 1000 & 1200 rpm already.
     
  7. Zeke

    Zeke New Member

    Joined:
    Apr 6, 2003
    Messages:
    3
    Likes Received:
    0
    Trophy Points:
    0
    Location:
    palmyra N.j.
    Map
    Yeah I know, but right from the dealer mine was set at about 800. They also lost the owner's manual in the warehouse. I think I will find another dealer to service my bike.
     
  8. waldrm

    waldrm New Member

    Joined:
    Jan 29, 2003
    Messages:
    229
    Likes Received:
    1
    Trophy Points:
    0
    Location:
    SE North Carolina
    Not sure how Honda has the new models hooked up, but if it was a car with these symptoms it would most likely be the throttle position sensor (TPS).  You can run a resistance check on it if you know the millivolt values, but under wararanty I would let the dealer figure it out.
     
  9. Guest

    Guest Guest

    I'm not experiencing any stalling problems on my '02 VTEC, but I do have this:

    between 4000 - 5000 rpm, I occasionally get a little "hiccup" -- almost like I just closed, then opened the throttle. At first, I thought it was just me, but then I've seen on the British forums that there are lots of people experiencing something similar.

    It's only a minor thing, and I don't even have it happen all the time (just occasionally), but I'm wondering if anybody else over here have the same thing?

    Also, some on that other forum mentioned that it went away after installing K&N air filters -- but I checked the K&N website, and they don't list an air filter for the '02/'03 VTEC bikes. Do they have something in Britain that we don't have here?
     
  10. VFRMike

    VFRMike New Member

    Country:
    United States
    Joined:
    Mar 20, 2003
    Messages:
    51
    Likes Received:
    0
    Trophy Points:
    6
    Location:
    Paso Robles, CA
    Map
    Kyle,

    I, like many others, have had that on/off/on in acceleration within 4500-5000 rpms. I put a K & N air filter in mine and the problem is now cured. The filters from the previous generation 98-01 fit and work perfectly. In addition there's a nice howl now at about 4700 (or was that 5700??) rpms. Anyway, I must say it's much more of a pleasure to ride without that on/off/on to deal with.

    VFRMike.
     
  11. Guest

    Guest Guest

    ::) Hey guys, the K&N part number for the 2002 2003 VFR 800 FI is; K&N HA 8098. This is the us part number and the difference IS noticable !!!!!
     
Related Topics

Share This Page