| Author | Message | ||
     Paul56 |
After suffering a broken throttle shaft I bit the bullet and bought a new throttle body. Got it installed yesterday and took it for a quick ride before other obligations stopped progress. Started and idled fine and ran through the gears fine up to about 1/3 to 1/2 throttle, then just nosed over like no fuel delivery. Absolutely no engine response- as if the kill switch was switched off. Reduce throttle setting and it comes back to life. If I creep up on the dead zone it will hesitate and stumble just before going full dead (like running out of fuel) Rode it again today about 70 miles- mostly at one throttle setting (3600 rpm/75mph) to get the AFV to auto-reset (I'm having trouble getting ECMSpy to work on my garage computer). Removed the signal wire from the TPS to check voltage- very linear with no dead spots from idle (0.94v) to full throttle (3.7v). I can't imagine that the TPS could be so far out of adjustment that it would start/idle/low throttle ok but not take additional load. I'm leaning toward inadequate fuel flow and/or pressure but don't have a way to measure it. When keyed on the pump sounds the same as it always has. It has been sitting since June 25. Any additional thoughts or similar experience? Thanks 06 with 82,000 miles | ||
| Ratbuell |
If its a new throttle body...reset the TPS. It could ABSOLUTELY cause your problems. I had a service done incorrectly once, and couldn't ride six feet without the bike dying. Even if you carried over your sensor, the new plate alone will cause the ECM to go nuts. Reset it. | ||
| Etennuly |
 TPS reset very important on replaced components. | ||
| Darth_villar |
It also sounds like it could be the bottom of the airbox intake hose is not COMPLETELY seated onto the intake manifold. Idle may be somewhat erratic, but at a certain point, around 3700 rpm and higher, it just wants to die completely. Don't ask me how I know :P Phil | ||
| Ratbuell |
Do ya HAVE to call me stoopid, Vern? I mean really...  | ||
| Etennuly |
Oh sorry.....I thought you knew!  | ||
| Paul56 |
Thanks all for the replies. Crazy work hours will prevent any progress for a few days. Will post as I am able. | ||
| Paul56 |
Update on my saga: I got ECMSpy working and checked the TPS- uh-oh. 0.4% before adjustment and 104% AFV. I knew these were too close to right to be responsible for the problem. Reset both and took it for a ride- just as I figured the dead zone was still there. I can run it to the redline in lower gears if done with light throttle setting but hammer it below 3000 rpm and it just DIES. I can roll the throttle back a little and full on and hear the tone change as the throttle body opens and begins to close but until I nearly fully close it it will make NO power. I rigged up a way to test the fuel pressure and found it to be 52 psi (good). I don't dare ride it this way because some of the fuel line connections are just hose clamps on slick tubing, so I don't know what the pressure is under a load. I guess the next step is to remove the throttle body and remove the fuel rail and injectors and look for debris causing a blockage. If I don't find anything I may install the old injectors and retry. I could also ride it with ECMSpy in data logging mode (I hope) and see what happens to injector on time when I advance the throttle. I'm convinced it's a lack of fuel delivery. Just frustrating because of the lack of time to work on it. | ||
| Pontlee77 |
Truly I had the same problem and took it to a dealer where the mechanic is quite skilled and with the harley software he adjusted my TPS and bike runs near to perfect. he used the % of the tps lowered it to zero and turned it one whole turn more then he reset it and put the º ( degrees) to 5.1 and all was fine. |
