I have a 2004 with Yosh RS-3 pipes and a PCIII. When the bike arrived here in South Korea it had a massive detonation issue. It would start knocking at around 4500, taper off and come back on around 6500. A very unsettling sound, as in I hope the engine doesn't blow.
The seller said it had a full Yosh system, but contacting Yosh revealed that they only made a full system for the SP1. I tried different maps (the PCIII had a Yosh full system map) and it didn't make much difference. I used the PCIII push buttons to richen it, which reduced the detonation but also the performance. The bike sat for a year or so in the US while I was trying to make shipping arrangements (a very long story). When the shipping arrangements were complete the seller had to drive it 10 miles to a pickup location,. I was thinking the nasty old gas might have plugged the injectors, further complicated that the seller replaced the locking gas cap with another cap that doesn't seal perfectly (I can smell the gas leaking), and this 1 year sit and evaporation probably further skanked the gas.
So lately after reading an issue here about an issue resolved by cleaning the ECM pins I opened it up and yes the pins were somewhat corroded. I cleaned them up holding the ECM in the air with the pins pointing down and dousing with WD-40 and tap it on the ground to get as much WD-40 out. Then I used some fine sandpaper and a knife to try to clean up the pins. Amazingly, the cleaning reduced the detonation, but it's warmed now since the last time I rode it (winter). So I went through the service manual checks to try to narrow down the issue. When I turn on the ignition, the FI light comes on for a few secs and turns off, no blink. When I tested the ECM using the shorting plug, it continuously blinked (did not stop at 20 blinks). I reset it and tested again with the shorting plug, which now gives a normal indication (on continuously). I don't know why the different results. Anyway, no blinks normally.
I tested the MAP, BARO, IAT and ECT portions of the ECM and all tested OK. I did not actually disconnect any of these (I'm adverse to unnecessary work if I can find a work around), I just stuck multimeter leads through the ECM connectors and took voltage and also ohm readings on all pins relating to the above. All looks good.
So any advice would be welcome. I was thinking maybe the throttle bodies might be loose causing an air leak, but that's more work than I want to do. Besides, I would think that Honda has this stuff so engineered that they couldn't possibly have worked loose. Hoping anyway. Thanks for any insights.
I previously had a 2004 but it got stolen. Korean police are a joke, they didn't do anything to find the bike. We have CCTV in our area that everyone has to drive through. I would expect that if you give them a time frame that they could hunt down any vehicles that passed through. Especially if it's an enclosed truck.