| Author | Message | ||
     Truedog |
Last summer I was able to cure my misfiring problem by replacing the injectors. I have another problem which also showed up late last summer and reared its ugly head again today (our first day over 80 degrees). On hot days the bike runs fine until I've ridden several miles and parked the bike for a short time. Upon trying to start the bike after it sits for 10-30 minutes, it will start, but then die within 10 seconds or so, then is difficult to start. Once started, it doesn't want to idle at normal speed until after I've ridden a few miles. It has the new injectors, but I've also tried two different throttle bodies, manifolds, and ECMs with no change. It also has a new fuel filter, O2 sensor, head temp sensor and IAT. Anybody have any ideas? It almost acts like a carburated engine that is vapor locking. | ||
| Truedog |
Oops, forgot to mention, this is a 2001 S3T. | ||
| Buellistic |
How about the rear header gasket ??? EXHAUST SYSTEM ASSEMBLY Class 101, just PM me if you want a copy ... | ||
| Akbuell |
Given what you have checked/changed, you may be on the right track re vapor lock. Buell came out w/a fan kit that basically cools the fuel rail. Don't know if any are still around and available. Perhaps a homemade heat shield around the fuel rail, using the adhesive-backed thermo barrier stuff as a test? | ||
| Preybird1 |
Where is you IAT sensor located at. | ||
| Hootowl |
The fan kit was meant to address a specific condition in Japan caused by poor quality fuel. It blows on the intake manifold. I found that it dumps a significant (or what I perceive to be significant) amount of heat. But it doesn't sound to me like it will solve this issue, as the bike runs fine without it, even on 100 degree days. | ||
| Hootowl |
Al has the fan kit. http://www.americansportbike.com/shoponline/ccp0-p rodshow/17576.html | ||
| Truedog |
I have a Forcewinder air cleaner and the IAT sticks through a hole in the back side of the K&N filter. | ||
| Two_seasons |
Sounds to me like your bike seems to think it needs a Cold Start Enrichener state (more than 100%). If you have ECMspy you can check it. | ||
| Akbuell |
P.M. sent | ||
| Truedog |
Anyone have any more suggestions? I can't believe that I need the fan kit since I've had the bike for 11 years and haven't made any changes since very early on (Forcewinder, D&D exhaust, Race ECM). It didn't have this problem until late last summer and now again this summer, only when the temp is very near or over 90. I did replace the exhaust gaskets over the weekend. Also I DO NOT have ECMspy. | ||
| Hootowl |
When this happens again, open your gas cap and try to start it. | ||
| Truedog |
Tried that. I wonder if my fuel pump may be starting to fail. It acted sort of like this about 10 years ago before the fuel pump died. | ||
| Screamer |
You may want to see if the fuel pressure drops off rapidly after the ignition is shut off - will tell you if you have a leaking injector or even a regulator issue which might give you the symptoms you're describing. | ||
| Flatheadbill |
Hi. Had the same issue on my 2000 X1. Wrap the header with good quality header wrap. This will keep most of the heat away from your air cleaner and IAT sensor while the bike is sitting and cooling. Your leg will also feel much better while riding in town. Try it. Its cheap and works. | ||
| Kalali |
First and foremost you need to get yourself a copy of the ECMSpy and a cable. Its a required "tool" for any FI Buell owner. Given that your symptoms are temperature (change) related and you've already ruled out leaky injectors, the most likely root cause is something that measures and reports the temperature - IAT or head temp sensor. I would tend rule out the head temp sensor because your symptoms seem to show up when the bike is stationary for a while - no air flow. So if it were me I would relocate the IAT to say behind the fly screen and see if your symptoms go away. The hole behind the filter is way too close to the header to give an accurate reading for the ambient temperature. Just touch the elbow and you'll see what I mean. If you had ECMSpy you could have easily checked the IAT temp reading during hard starts and see if it is close to the actual outside temp. I wouldn't spend money on a fan as these bikes are designed to work without them. It will only mask the root cause. Good luck. | ||
| Truedog |
The bike acted up today while riding. It ran great for the first 20 minutes or so, then acted like it was running out of fuel, backfiring and sputtering. It died as soon as I let it idle. I am sure it will run fine when I go home from work. I seem to recall similar symptoms prior to replacing a fuel pump about ten years ago. Could the pump be slowing down as it heats up? Also, does anyone know of any automotive pump that can be substituted? Where does a person get ECMSpy? I can't find it available anywhere. | ||
| Two_seasons |
I believe a Ford Mustang fuel pump fits. Not sure what year. Are you sure your Engine Temp Sensor isn't giving you grief? Disconnect and see if that makes a difference when engine is up to operating temperature. | ||
| Truedog |
Are you saying just try riding a bit with the head temp sensor unplugged? | ||
| Two_seasons |
Yup, that's what I'm saying. If the symptoms are exactly the same with ETS unplugged, then you know. | ||
| Essmjay |
I just cured same symptoms with a new ETS. The voltage test is in the service manual. Mine was outputting the same voltage at all temp ranges Also had a trouble code stored for bad ETS Also a bad ETS will make the fuel mix too rich so the plugs will be black. | ||
| Alfau |
Ideally, If you could get someone to run the diagnostics tests with EcmSpy. Would save you time and money. EcmSpy won't tell you if the rear header flange gasket is leaking . Without air flow the forcewinder air cleaner allows heat radiating from the headers to affect the IAT; which automatically adjusts your fuel to suit the detected conditions. Solution, relocate IAT up behind fly screen away from radiated heat. |
