| Author | Message | ||
     Midknyte |
Last few nights out, when the temperature drops with the sunset (from about 80 degrees to 60's in the span of a half hour or less), my bike has begun to run rough for a little bit, then straightens itself out... Best way to describe how it feels is, it feels like a carburated bike that's low on gas just before / when you need to switch to reserve. Is happening most noticeably around 3500 rpm. Comments? | ||
| Percyco |
Change your plugs first....... | ||
| Holling |
Is the engine cold when this happens? My 9S does the same thing. In cooler weather you need to let the engine warm up before you take off or ride easy for several miles to warm it up. Its running in open loop mode when cold so its a rich mixture. | ||
| Midknyte |
Just changed plugs a couple of hundred miles ago. Yes, this is after I've been riding for only a short time. Typically the same 20-30 min span that the sun sets and the temps drop. I do let it warm up for a few minutes while I gear up before initially taking off. | ||
| Xring |
Running lean? Vacuum leak, maybe? Intake manifold seals? Or the ever-popular TPS reset. Good luck, Bill | ||
| T9r |
What is your mileage on the bike? Could be the plug wires if they are worn, but since you recently replaced the plugs I'm sure the wires were inspected. I'd lean more towards intake manifold gasket leaks. Test for leaks around the intake area between the cylinders Though if you've done a header removal and didn't replace the exhaust seals that would be it. The TPS reset should be done every 5k miles or with every intake/exhaust or computer modification. Doing a TPS reset and having an intake leak leads to an invalid reset (bike runs like junk). | ||
| Midknyte |
6800 miles. plug wires look alright (visually). I am not worried about this at all. it's just an observed behavior that sorts itself in a few miles out and I am confident that it's just adjusting to the rapid drop in air temp. Just wanted to know if anyone noticed the same... | ||
| Fullpower |
TPS zero and intake manifold seal condition are NOT co-relative. | ||
| Xbeau12s |
Just running cold. My 04 does the same thing. Just don't take off instantly after you start it up when It's cold. | ||
| Xring |
My bike runs a little wonky when cold, sometimes, but usually at lower rpm...about 2500. Anything over that is fine. And it is always the first time I let the clutch out. I do ride it easy for the first couple of miles in the mornings. I've never noticed that changing weather (air temp, barometric pressure) affected the Buell, but every Dodge vehicle I've had was affected by it. If the weather was drastically different from the time it was parked to the time it was started again, the idle would be erratic and/or would be rough running on the low end for a few minutes. Always cleared up. Just the fuel injection system adapting, I suppose. I was just thinking in your case, that if your bike is running a little lean, that the extra density of cooler air was just enough to make it noticeable. Good luck, Bill | ||
| Kowpow225 |
Is it getting a little more decel popping during this time as well? Mostly around 1800 rpm when dropping back to idle? | ||
| Buellshyter |
What does popping on decel signify? | ||
| Xring |
Popping on deceleration can mean the engine is running lean. Also, burnt or poorly seated valves will cause popping. Bill | ||
| Glitch |
At 3500rpm the bike goes from open to closed loop. I think what you are seeing is the bike "learning" the difference in air temp. Just your DDFI doin it's job. | ||
| Pwnzor |
Bring the bike ALL THE WAY to operating temperature BEFORE you ride away. Learned that one the hard way myself. I warm up my bike just like I do my tractor. | ||
| Midknyte |
At 3500rpm the bike goes from open to closed loop. I think what you are seeing is the bike "learning" the difference in air temp. That's what I had figured. For the record, I have my answer. Was seeking confirmation more than anything. Thanks. | ||
| T9r |
Fullpower, The TPS could be reset but the idle would be difficult to get set right with an intake leak. My front plug wires were wearing on the bottom where it was rubbing on a throttle cable. | ||
| Yellowbolter |
what the hell is a tps reset...last night i road my bike for a while and when i turned it off the fan ran for a little bit then about 30 minutes later i went it and it idled a little ruff until i took it out on the road for like 5 minutes....was the engine just cold? is this normal for the buells? | ||
| T9r |
After you get a (throttle position sensor) TPS reset and an AFV reset you must run the bike 10 min on roads at or above 3500rpm to have the ecm relearn. If this is not done the bike will behave rough. I'll test this out on my own bike and see. | ||
| Metalstorm |
I'm with Pwnzor on the warm up. I have been known to let my bike idle in the driveway for up to 10 minutes. I like my engine fully warm & all the gaskets sealed well before that initial take off. Plus a cold running engine can get a little herky jerky. My Bronco II is the same way. She's gotta be warm to run right. (Message edited by metalstorm on August 25, 2006) | ||
| Glitch |
She's gotta be warm to run right. So true, so true, on so many different levels.  | ||
| Buellshyter |
but your Bronco ain't fuel injected. | ||
| Metalstorm |
My Bronco is fuel injected Glitch is a very wise man  |
