Can't figure it out!




fastbike1300

Registered
When I ride I get about 15, 20 min into it and while cruising 4500 5000 RPM'S, it feels like I lose power and the engine misses. This does not happen all the time and sometimes it just goes away. I have no mods 21,500 miles on it. It does the same thing at lower RPM'S also once it starts.

I have checked the tank vent hose and have done all the periodic services. Help! This is bugging the crap out of me!

Oh, when I wick open the throttle, it still pulls hard no misses pulls to red line and I did 180 yesterday if that matters.
thanks again.
 

MET

The Watcher
Registered
Check your throttle bodies and make sure they are all in sinc. Also start with the easy things like the airfilter. Could be clogged or it sucked something in? Still have the screens on the front?
 

fastbike1300

Registered
ninja eater I did the 15000 mile check myself including the valves. It would do it sporadicly before the 15k service and at first I thought it was bad gas. I guess I go to the manual agian and check the t-bodies. The only thing I did not do. by the way any suggestions on doing the t-body check?

thanks FB
 

cache

Banned
whatever it is, its a closed-loop circuit problem. when you go openthrottle, you are in open-loop just as when the engine is cold and not up to normal operating temperature. The fact that you get into about 15+minutes of riding tells me that once it gets to normal operating temperature, you get problems. That can put several sensors and sending units into play.

1) check sensors like coolant temp sensor, airflow sensor, etc.
2) check your fuel... crappy fuel will foul when engine is warm and not under load
3) check spark plugs for same reason as fuel problems

Primarily the problem will be in what the normal garage-tech will not know how to diagnose. When the engine is at normal operating temperature, and in closed-loop operation, many sensors and sending units willl come into play. Even in closed-loop operation, when you go to wide-open-throttle, some of the systems are bypassed and will not effect performance.
Your symptoms including being able to haul ass with no problem, tells me you have a bad sensor, sending unit, or injector malfunction. Sorry to not help you with anything but confuze you, but you are not riding a Honda CT90 either.

Please let me know if your bike is under warranty, or if you plan on fixing this yourself.

cache
 

Kerberos

Registered
could this be the sensor that is in the airbox for temp? you know, the one that others have removed and relocated into on of the ram air tubes?
 

fastbike1300

Registered
Cache thanks for the info! O.K. yell at me but I did not replace plugs at 15k like I should have. I will be fixing it myself so any help you can provide will be great!

Hey K I have not made any mods to the airbox but I will see if the sensor is connected properly. Would the speed sensor have anything to do with it? I HATE diagnosing problems! I put about 100 miles on it every day. Got to get it fixed.

thanks
 

cache

Banned
Check TPS
If the Throttle Position Sensor is the culprate, you will notice problems at any temperature at the same throttle opening every time, ie: half-throttle would act up cold or warm, etc.

Maybe Narcissus has prior experience with this symptom, but I would assume a temperature sensor, or something that tells the ecu to be at normal operating temperature, would cause a warm-engine driveability issue.
You don't encounter any of the symptoms when the engine is cold while you are riding? or is it a constant issue?
 
Thread starter Similar threads Forum Replies Date
captain Can't figure out why I'm always sick! Random Thoughts 24
keene757 Bike Idling Rough! Can't Figure It Out! Gen II Busa Information 13
goalie31 Clutch Issue - Just can't figure this out Busa problems 7
labrocha Go figure Busa problems 0
outlawbusa What do you figure made this? Random Thoughts 12
rubbersidedown Chicks are super easy to figure out. Video proof here..... Random Thoughts 10
N help me figure out what these wheels are, need parts Modifications & Aftermarket Equipment 7
J can anyone figure this out? General Bike Related Topics 17
rubbersidedown Need help setting up a poll (busted brain cant figure it out THANKS Random Thoughts 17
T I cannot for the life of me figure out what ecu this is and how to tune it! Engine and Performance mods 19
Busa Rookie figure 8s Random Thoughts 17
theskaz Electrical Issue (go figure....) Busa problems 22
Gpmo Figure this one out ! Random Thoughts 21
Blanca BusaLess Cant figure it out. There's something seriously wrong with the Cuban Dragon? Random Thoughts 26
theshnizzle Figure this out.....Solutions please!!! General Bike Related Topics 28
rashad See if you can figure this one out! Weird electrical/headlight gremlins.. General Bike Related Topics 21
Dino Men's figure skating Question. Random Thoughts 21
teamorion22 please help me figure out this mod General Bike Related Topics 6
S Call me stupid.... I can't figure it out... Gen II Busa Information 13
thrasherfox Idiots - took researchers to figure this out Random Thoughts 13
Mrs.Rubber2Burn I bypassed the filter at work!!! How long before they figure me out?? Random Thoughts 61
G I need some help cant figure it out 1/4 Mile 4
B Figure actual CR Engine and Performance mods 2
chevelle how to figure jetting ? Nitrous 8
babuski Babuski's 5 figure windfall.... General Bike Related Topics 33
night_ryder Another noise that i can't figure it out. Busa problems 17
B Trying to figure out how to post New Owners Forum 3
D Help me figure times... 1/4 Mile 3
justintime2 Have a video I want to upload but can't figure Random Thoughts 4
dbusa101 Cant figure out how to upload a pic General Bike Related Topics 14
PACIFICBUSA Been trying to figure this out... Random Thoughts 17
O Figure you guys will get a kick out of this General Bike Related Topics 9
H Go figure General Bike Related Topics 2
Similar threads



































Latest Bikes

Forum statistics

Threads
174,588
Messages
3,127,927
Members
48,494
Latest member
Dancallun
Top