Hoping you could help me figure out why my 08 ZX6R will not start after a year of sitting. I was dumb and left a little fuel in it after I started it last (June 2018) and my fuel pump seized up completely. I have since replaced the fuel pump with a 100L/min pump per the service manual but the bike will not start on its own. I can start it by spraying starter fluid into the intake, but it seems as if the injectors will not spray. I checked with a test light at all 4 primary injectors while cranking the engine and I am getting power to the injectors. I have not verified fuel pressure as I do not have that tool. Any thoughts?
I have tried cleaning out the injectors and replacing the primary rail with a used fuel rail, but still no luck.
Hello, have you’ve looked inside your tank as of yet? I had a similar issue with my buddies bike. His tank was rusted on the inside, which caused his bike to keep killing he fuel pump. Does your pump prime when it turns on?
It does prime. I believe I've narrowed it down to the injectors not receiving proper signal to open. I can manually open the injectors by using 12V and a jumper, but the connectors from the ECU do not open them. The connectors do have 12V when the key is turned on and the pump is priming, but they do not open. When I jump the injectors manually off the bike, I CAN hear them click and open. When they are plugged into the connectors on the bike, they DO NOT click nor open. It's mind boggling.
The tip over sensor is plugged in and in the upright position. What would turn only the injectors off? I was thinking possibly the cam sensor? Any thoughts?
I have done that, and no codes appear. I know the cluster works, but no codes come from holding down the mode button while viewing the odometer reading. No F1 codes at all.
To add to the troubleshooting information, I isolated the issue to not receiving the ground from the ECU to the bank of injectors. I have verified positive pulse to injectors from fuel pump relay. What would cause the ECU to not send ground to the injectors? Bad ECU? Camshaft sensor? I'm losing my mind over this bike.
What year is your bike? We had one guy wired up his fuel pump backwards (with reverse polarity), so it made noise but did not actually pump fuel... One side of the injectors usually gets a common voltage from the fuel pump relay (same as the fuel pump); the other side gets a control signal from the ecu. The other side of the fuel pump (and the rest of the bike) shares a ground (typically black/yellow wires) with the ecu, thru joint connectors or possibly even the frame. Do you hear the fuel pump prime for a full 3 seconds when you turn on the ignition? If you cut something, did you check fuses? (Is your vehicle-down sensor up? Even though if it is down, I expect spark to be cut as well as fuel -- but have never confirmed that -- and you clearly have spark if starting fluid works.)
2008. Yes I wired the pump right. It primes when I turn it on. I have even taken my injectors off and turned on the bike to see how the pump was pushing fuel and it does what it should.
I’ve replaced a lot of stuff on here but I cut out an old locator and when I did it sparked (battery still connected) had 1 ride after that and then nothing.
Have you done a signal test to the injectors? That will tell you if signal is getting from the ECU to the injector. You can get noid lights from amazon.
Assuming you're not getting an injector signal, you have to trace back both wires to find the issue... One wire should get common 12V from the fuel pump relay -- it should turn on with ignition. The other wire should go back to the ECU (you have 8 injectors, but my understanding is the 4 secondary injectors are only used at high rpm and significant throttle). Your ECU should supply "ground" to the other wire intermittently. ECU ground is connected from multiple wires shown below -- it is hard to know which is actually used for this, but you have to make sure each is good -- I'd start with 66, 34, and 31. To test a ground wire, you can't just measure 0V (which any open signal would also measure) -- instead, you have to measure an actual 12V difference to a 12V signal -- then you know you have a real ground.
You'll end up with one of two possibilities (assuming you are not getting an injector signal) -- either the ECU is intentionally not generating a signal, or the signal is getting lost somewhere due to a bad connection or missing ground. If the ECU is intentionally not generating a signal, the next question is why...
Hey anyone figure this out? 07 zx6r same issue, new fuel pump, crankshaft sensor, secondary injectors, starter relay, battery, spark plugs. I cleaned tank replaced fuel twice with added seafoam. Only 2.5 gallons each time, anyway just cranks and will fire with starter fluid, then die when I stop spraying. Please help
Sounds like your injectors arent spraying. Now u just have to figure out why.
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