| Author | Message | ||
     Zoink |
I've started doing some tuning on my 03 xb9r and so far it's going great and the bike is running much better, except now it's idling funny. Here's exactly what I did: Spent one afternoon running around town logging maps, going over them in megalog viewer, and testing them on the bike. I never started the bike cold so I never got to see how it would idle cold, but never had any problems with the idle when it was warm. The next day it was raining all day, so I didn't ride the bike but I did clean the throttle body and change my breather reroute mod some (it had some small hose coming off the T-connector I replaced it with 3/8" hose and made everything look nice). What it's doing: When I first start the bike it has a really lopy idle, so much that every couple lopes it dims the headlight and dash lights and sounds like it's about to die. It never does die, and after about a minute or so I just hopped on it and rode it figuring the battery might be dying. After it had warmed up some it idled fine, but still dropped to about 800 or so every time I came to a stop before coming back up. It first did this after I cleaned the TB and changed the breather hose so I assumed it was just from a little bit of leftover cleaner left in the TB, but since it happened today as well I don't think that's the case. I thought maybe that my TPS was off a bit, even though I had just reset it the other day, and when I went out to adjust it it made no change while the cold start enrichment was running (i had it hooked up to ecmspy) but after the cold start turned off the idle went up about 200 RPMs. I figured maybe the bike was just running too rich at idle, and the cold start was richening it even further causing the idle to bog initially on cold start (causing the light dimming) and when the TPS was adjusted it caused it to bog so that it made the idle set too high (~1200 after the enrichment turned off) look normal. I took a log after the bike was up to operating temps and megalog is telling me to add more fuel, quite a bit more in fact, in the idle/low RPM+TPS ranges. Is megalog wrong maybe, or is there something else that's causing my weird idle? Also the lowest the battery voltage dropped during the logs was 13.3 volts, which is during a point when the engine bogged down to about 800 RPMs. Otherwise it was pretty consistent around 14.5. | ||
| Froggy |
Whats your battery voltage at idle and again with the key off? | ||
| Zoink |
Just went out and plugged it in and it was at 12.3 before start, about 10 seconds after it was started it was ~14.5 at idle. | ||
| Zoink |
This morning the loping actually killed the bike once...but it started right up the first time, and started right up after it died so I don't really think it's the battery. When I stopped at the first light the idle was perfectly fine. :/ | ||
| Hogs |
Nature of the Beast.! | ||
| 1_mike |
"Nature of the beast".... This is a joke statement right...? My 04 XB12R, starts and idles smoothly. A loping idle is from one or a combination of two things. First and most likely...too lean. Second and almost as likely, low ignition timing. I raised my timing and added fuel from the way I bought it, untouched (somewhat) by the original owner... It doesn't lope any more, it's got a ton of low speed drivability. It's MUCH better on the freeway. If the original owner was to drive it..he'd hurt himself. Also, it went from about 46mpg to over 50mpg average, freeway and city driving. Mike | ||
| Greg_e |
I would compare the fuel map cells between the stock unmodified maps that you saved before you started tuning and the modified maps to see if there is a huge change between both the fuel and even the spark advance. I think I remember reading in the tuning guide that you can edit the fuel cells individually so you could maybe move the idle areas back to stock and see what happens. Check for a vacuum leak, I had similar conditions until I plugged the evap fitting again. Also check for error codes. The way the idle adjust screw works should have an affect at all temperatures since you are literally moving the throttle butterfly when you turn the screw. Are you certain you had the idle screw turned far enough when you did the TPS reset? | ||
| Zoink |
@ 1_mike - I highly doubt it's running lean...it added quite a bit of fuel from the race maps that I started with, and because of the issue with the cold start enrichment (idle went up after it turned off) that tells me it's probably running rich if anything. @greg - here's the fuel maps new map:  old map:  What's the evap fitting? I turned the idle screw to display 0 in ECMSpy when I did the TPS reset, I did another one today just to make sure...hasn't cooled off yet so I can't test and see if it helped. | ||
| Zoink |
Just saw the evap thread a little ways down. Went outside and checked it, no plug. Maybe i knocked it off when I cleaned the TB or maybe it never had one on it, who knows. Smallest I had was a 5/32" cap and it fit alright, hopefully that will help. | ||
| Zoink |
Well that wasn't the problem. It was still doing it tonight...except tonight it idled with the lope for about a full minute, then it coughed twice through the airbox and died. Guess I'm going to try the stock fuel mapping...if that works I wonder how accurate megalog is for the rest of my map :/ | ||
| Greg_e |
Right at idle you have a bunch more fuel going to a bunch less fuel in the new map. I would probably run some logging again and adjust again to get a refined map, and do this at least three times like the guide says. After that if it is still not good I would load up the stock map and see how it does. If better at idle I would edit the new maps in a spreadsheet to replace the idle values from the new with the old and see what happens. There is going to be a lot of fiddling with all this until you get the real hang of the system. All that said I am far from an expert, but this is the way I would approach your problem. |
