I have a cx500tc with a low idle problem. It will idle fine at <1000 rpm. Between 2000 and 3000 rpm's it acts like it is being starve of fuel, it hickup's and misses. Above 3000 rpm's it has no hickups or missing and runs fine. I have went through the fuel system, cleaned all of the screens and replace the fuel filter and had the injectors cleaned and rebuilt. There are no codes in the computer. The symptoms remain the same. It also does not seem to generate any turbo boost. I have owned two other turbos prior to this bike and it is very evident when the bike goes into boost. When I got the bike the previous owner had a clamp on the waste gate which seemed a little odd, not sure what that was all about. I removed the clamp and it did not change anything. I thought it may have a bad pb sensor, I put a new/used pb sensor on it and that did not change a thing. I am not sure where to go from here. If anyone has any suggestions it would be greatly appreciated.
Kevin M
Yeah, sounds like a boost leak to me as well. Can you elaborate on the wastegate clamp? Does the wastegate actuator move when you manually apply pressure? I'd also test the diaphragm in the wastegate actuator by hooking a vacuum pump to it and see if it will hold a vacuum. If the diaphragm is badly torn enough, it will create a small boost leak.
I have been chasing a similar problem for several years. Because the 500t has an "open loop" fuel system, it has no way of knowing whether the mixture is exactly right or not. Mine had a bad Pb sensor when I bought it, and was burning copious amounts of fuel. After I replaced the boost sensor, it fixed that problem, but then it had the coughing and sputtering issue. I don't have any turbocharger problems, however. What I ended up doing is drilling out the TPS bolts and turning the TPS counter-clockwise about 1/8 inch or so (richening the mixture), tuning it by ear until it ran smoothly. It runs perfectly now, but I have never been able to find out why I needed to do that in the first place. I even went so far as to build a test jig and qualify all the sensors to make sure they were ok. They're perfect.
First easy thing to do is unplug the Pb sensor connector. Yes, it will cause the fuel system light to come on, but if it then runs correctly, you still have a sensor issue.
You probably should remove the fairing and exhaust pipe and make sure the turbo isn't locked up or otherwise damaged, and that all the connecting pipes are right. I agree that you should make sure the waste gate actuator is still working as well. If the spring was broken or something, maybe that's why he clamped it.
Sounds like the previous owner might be a bit IQ challenged if he disabled the waste gate. Either he was trying to troubleshoot the boost problem, or caused it.
I'll be interested to hear what you find.
Good luck
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First easy thing to do is unplug the Pb sensor connector. Yes, it will cause the fuel system light to come on, but if it then runs correctly, you still have a sensor issue.
You probably should remove the fairing and exhaust pipe and make sure the turbo isn't locked up or otherwise damaged, and that all the connecting pipes are right. I agree that you should make sure the waste gate actuator is still working as well. If the spring was broken or something, maybe that's why he clamped it.
Sounds like the previous owner might be a bit IQ challenged if he disabled the waste gate. Either he was trying to troubleshoot the boost problem, or caused it.
I'll be interested to hear what you find.
Good luck
Just thought I'd throw this in here too.
Checked the timing and Pign sensor operation?
The ignition system advances the timing based on manifold vacuum and rpms (higher vaccum=more advance, lower rpms=more advance), if the ignition isn't advancing the timing but the ECU is leaning the mixture that could be what's happening.
Could also be a TPS going bad.
Checked the timing and Pign sensor operation?
The ignition system advances the timing based on manifold vacuum and rpms (higher vaccum=more advance, lower rpms=more advance), if the ignition isn't advancing the timing but the ECU is leaning the mixture that could be what's happening.
Could also be a TPS going bad.
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