| Author | Message | ||
     12mpghwy |
Bike runs poorly very down on power everywhere, but idles OK. No noticeable change in idle when spraying around intake, so no apparent intake leak. Replaced the O2 sensor, code came right back, replaced the wire connecting the 02 sensor and ecu, twice, code comes back, tried 2 different ECUs one stock one race, code comes right back. Tried checking the voltage output of the sensor directly, sensor looks functional: .39-.6 volts changing with rpm. The ECU outputs .5 volts from the sensor input as soon as the bike is running, I am assuming that this goes away when it goes into open loop mode. Ive been troubleshooting this for hours. The bike ran good a few months ago. | ||
| Tom_b |
tried resetting your TPS? Sounds like could be the problem. Usually have to reset TPS after swapping ECU | ||
| 12mpghwy |
yes TPS reset done a dozen times at least. | ||
| Numb_nutz |
Those run at open loop at idle and wide open. Closed loop thru out the mid range. If the sensor is setting a code its most likely due to something else causing it to run rich or lean. I'm a auto repair tech and see this all the time. Just because the ecm sets a code that doesn't mean thats the problem. Look at the sensor, if its black its rich, if it's white its lean. I'm guessing lean. Not getting enough fuel, injectors plugged, fuel filter restricted, pump failing. | ||
| Terrycoxusa |
I bought a cable and the ECM spy on ebay for $45. It will tell you anything you need to know. | ||
| Firemanjim |
I am with Nutz--though they do go into closed loop at idle when they warm up. Something is causing the "down on power", so look there. ECM Spy will tell you what AFR is and that will let you know rich or lean---I am betting lean. | ||
| 12mpghwy |
I do have ECM spy that's how I am doing all my trouble shooting. At idle ECM spy shows .5 volts or thereabouts for the O2 sensor which corresponds to stoic. As I said at idle and perhaps everywhere the thing is open loop the ecm generates its own .5 volt signal out of the O2 sensor input. So this reading is meaningless. The rear plug shows rich. The front plug looks good. With ECM spy I am able to check that the coil (which is new by the way) is firing front and back. If I do the injector test I can hear the injector firing. corresponding to front and rear. I took the O2 sensor out and it smells of gas, granted the bike wasn't completely warm. There are trouble codes that are different (not O2 sensor open or unresponsive) for lean and rich. I do think the stuck injector is onto something though, if the rear is near flooding then the sensor will get soaked which may result in it not sensing O2 at all. I did replace the fuel filter through and the pump appears to be putting out the correct amount of pressure. The problem will, happen that is the thing will light just holding the rpm steady in neutral. No load necessary. Ok so I really think the most logical explanation is the sticking or dirty fuel injector. I think if the sensor is wet with gas then the computer may see it as unresponsive. And if it was some other kind of glitch I would expect the bike to run better. I don't think that the bike stays in closed loop at full throttle on the race ecm. | ||
| Britchri10 |
My X1 was fouling the front plug & showing an O2 sensor fault. After changing that,TPS reset etc' front plug still fouling and the bike running v.Rich. I replaced fuel injectors, reset TPS and the bike now runs great. Chris C | ||
| 12mpghwy |
He Britchri10 were did you get the fuel injectors? Anyone know of a source other than the dealer, what I have found is that they are Siemens injectors and may be used in some model ford. This ebay add lists specs as 120 CC/min at 3 bar, 13.7 ohms | ||
| 12mpghwy |
as a troubleshooting step I took the fuel rail out and used ecm spy to spray fuel into a cup. No obvious problems. Of course this proves nothing. Injectors are special order. I also drained the tank and pulled and inspected the fuel pump. no freyed wires etc. Put in brand new fuel, pulled the injectors and primed the pump a few times to get any old fuel out of the rail and filter. | ||
| Natexlh1000 |
An oxygen Oxygen sensor puts out a voltage if it's hot and exposed to Oxygen. you can bench test one with a digital volt meter and a propane torch. try this on the old one if you haven't thrown it away already: hold the hex part of the body with vice grips or pliers. connect the DVM to the wire and body. hold the sensor's buisiness end over a torch til it's good and hot. taking the torch away from the sensor will allow the hot tip to sniff out oxygen from the air. I think 1 volt is the expected amount. my X1 liked to chafe that black wire and would throw a code from time to time when it shorted against the pipe or whatever. | ||
| Britchri10 |
12mpghwy: The injectors came from a dealer. Stock Harley part. When I bought the bike I pretty much knew the injectors were shot. I looked around but couldn't source a replacement from anywhere other than Harley. Total cost c$170.00 for parts. | ||
| 12mpghwy |
I see thanks, one more tidbit. The front cyl gets way hotter very fast as compared with the rear cylinder. I am thinking the rear injector is probably the culprit. Since its very easy to pull injectors I may swap them too see what happens. | ||
| Britchri10 |
Are you getting any "backfires"? Mine sounded like a demented gunnery range during warm-up. I think mine was feeding way too much fuel to the front cylinder, leading to a late explosion of the excess gas in the muffler. I could be wrong though.... | ||
| 12mpghwy |
Found new injectors at a local dealer in stock, and its fixed. To answer the question it wasn't backfiring much. |
