| Author | Message | ||
     Williep13 |
I had a friend drop his X1 off with me to work on after he has finally given up on trying to figure out why it is misfiring, now I am about to the same point. It has good fuel pressure, maintains about 50 psi. I replaced the intake seals. Ran another ground wire (2 AWG) to the chasis just to make sure there is a good ground. I have went through the wiring harness with a fine tooth comb and see no visual problems, I havn't ohm'd every wire yet. I replaced the coil and plug wires with ones off of one of my bikes that I know are good and changed spark plugs. I have tried remapping his ecm and also changing to a stock ECM restting the TPS and AFV everytime. Took the fuel filter out didn't make a difference so I put it back in even though it is a new one, drained and replaced the fuel with new fuel and no it has never ran racing fuel. I have worked on this bike all day and got no where but a headache. I am open to anything??? I have looked back thru the archives and I think I have tried everything ever mentioned. I guess a little more detail on what the bike is doing would be helpful. It will fire right up and run great as you acceralate slowly it will start spitting and popping around 4500 rpm, if you go WOT it will just backfire. If it is idling and you go WOT it will go to about 5500 rpm and backfire and spit and pop. | ||
| Williep13 |
I also tested the injectors. | ||
| Jramsey |
>>if you go WOT it will just backfire. Check the exhaust gaskets. | ||
| Williep13 |
That was gonna be my next step, but for it to act up this bad I would think you would be able to see evidence of an exhaust leak. I will probably pull it off later in the week. | ||
| Williep13 |
replaced the exhaust gaskets its not that. checked the tps to make sure there is not flat spots in it and its not that. Anybody else got any ideas??? | ||
| 2kx1 |
Timing cup? | ||
| Two_seasons |
Battery cables tight? | ||
| M2typhoon |
Did you pull the plugs and inspect them? | ||
| Kalali |
This may be a long shot but I would recheck the plug wires to make sure they were not damaged during the removal/installation process. Also a few folks here have had issues with installing intake seals and had to do it twice. Worth doing a propane test to be sure. | ||
| Firemanjim |
So what is the AFV when you check it? And what do the plugs look like? Exhaust gaskets will not cause this. It is either way rich or way lean. Both will cause a misfire under load. Silly question,but are the injector connectors going to the correct injector--seen it a couple times? And how are you remapping? | ||
| Jramsey |
>> "Exhaust gaskets will not cause this." Maybe not in this instance but years ago I had a CB 750 that would not accelerate in mid range without popping and backfiring. Turned out to be a bad exhaust gasket on cylinder #3. Drove me nuts because I could not hear the leak. (Message edited by jramsey on February 23, 2011) | ||
| Williep13 |
Final Verdict The #14 plug under the starter that goes to the cam postioning sensor was not completly snapped together. When I say not completly I mean all but the last 32'nds of an inch to actually locks it in. So when you would actually rev the bike I guess it would cause it to ground or loose connection, but it would not cause a fault to show up it would just misfire and run eractic like a fuel problem. I finally gave up on anything other than electrical because I would play with the fuel mapping to see if it would make a difference but it wouldn't. I guess lesson learned if the problem seems to simple it probably is. | ||
| Kalali |
I'll have to add that to my troubleshooting checklist. Thanks for letting us know. | ||
| Williep13 |
The sad part was that he took it to three different dealerships that looked over this as well. | ||
| Jos51700 |
For future reference: A loose Cam sensor IS a fueling problem. The injectors are timed off of the cam sensor. | ||
| Packinheat |
I have been fighting the same issues for months now. I just ordered a new wiring harness and plan on taking the bike completely apart and re-assembleing. How do I test the injectors? I had a front injector issues multiple times (injector hat was coming loose) Some safety wire fixed that.. It all started when I snapped a drive belt acting up, makes me wonder about the CPS and wire... | ||
| Williep13 |
A loose connector is an electrical problem hence the wiring. Obviously the injectors are timed off the cam positioning sensor, that is what it does reads RPM's. The problem was not the fuel but it not sending the correct signal to the ECM. The RPM's were all over on ECM Spy but not on the tach I am assuming that is just because the tach isn't as sensitive. Either way it caused a problem. I don't know the "official" way to check the injectors but I pull them out and use ECM Spy to run a diagnostic test and make the fuel is misting or atomizing not squirting out. If you don't have ECM Spy I guess you could just turn the engine over and it will spray fuel every time the crankshaft passes a certain point. I am sure there is a better way with proper tools, etc but this works for me. |
