My bike is running too much fuel and wont go! - Page 2 - Kawasaki Forum :: KawasakiWorld.com
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post #16 of 29 Old 08-26-2019, 05:26 PM
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If you had the map sensor and tps switched that map sensor is now bad for sure. I have done this once before, its very easy to mix them up. Have you replaced with a known good one since swapping the plugs? This is most likely your problem.
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post #17 of 29 Old 08-26-2019, 10:25 PM Thread Starter
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If you had the map sensor and tps switched that map sensor is now bad for sure. I have done this once before, its very easy to mix them up. Have you replaced with a known good one since swapping the plugs? This is most likely your problem.
Yeah I have and it's still the same just without the fault lamp. The new water sensor is due to arrive in a couple of days so I'll fit that just to see but I might have to take the plunge with the ECU but the sounds of things.
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post #18 of 29 Old 08-27-2019, 02:57 AM
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I just don't see how the water temp sensor has any influence on the fuel intake?
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post #19 of 29 Old 08-27-2019, 09:08 AM
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I just don't see how the water temp sensor has any influence on the fuel intake?
Typically when an efi vehicle is cold, the ecu dumps more fuel in.. etc

2006 ZX-12R B6F
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post #20 of 29 Old 08-27-2019, 12:29 PM
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Typically when an efi vehicle is cold, the ecu dumps more fuel in.. etc
Didn't think a 12 would with having a manual choke lever compared to say a 14 which has it built in.
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post #21 of 29 Old 08-27-2019, 03:46 PM
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Didn't think a 12 would with having a manual choke lever compared to say a 14 which has it built in.
Its not a choke lever, it's a fast idle lever.

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post #22 of 29 Old 08-27-2019, 04:15 PM
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Its not a choke lever, it's a fast idle lever.
Ah, yes of course. Now makes sense that it could potentially be the water sensor. Had a look in the service manual under DFI and it shows up under a fault code. Good to know!
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post #23 of 29 Old 08-31-2019, 05:17 AM Thread Starter
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So I've replaced the ECU now and still getting the same thing.

I've decided to test every sensor and cable now and see where that leaves me, including the water temp sensor which turned out to be fine.

I'm really at a loss here, does anyone have any other suggestions? I'm about to test the vehicle down sensor and I'm struggling to find it. Has anyone changed this before?
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post #24 of 29 Old 08-31-2019, 06:13 AM
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It's a long shot, but could the return fuel line be blocked?
Good luck.

I have a A1 . 2000 model ZX12R with an extra wheel.
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post #25 of 29 Old 08-31-2019, 10:21 PM Thread Starter
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It's a long shot, but could the return fuel line be blocked?
Good luck.
Could be I guess, any ideas how I might test this? And also the fuel return valve I would guess
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post #26 of 29 Old 08-31-2019, 10:55 PM Thread Starter
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Ok so I went to test the fuel pump flow rate at the same time as making sure that the fuel lines weren't blocked so I basically disconnected the return hose from the tank, pointed it into a container then turned on the ignition. Manual says that I should expect 83ml or more from the fuel pump prime (3 secs). I turned the key like 10 tine but I didn't get any thing at all. To make sure the pump was ok I decided to do it directly from the pump outlet nozzle and got like 115 ml so the pump is fine.

Is there any reason why I might not get the fuel all the way through the injector rail and back down the return pipe under normal circumstances or should have got it?
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post #27 of 29 Old 09-01-2019, 07:57 AM Thread Starter
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Ok so more progress!!

With everything where it should be, it doesnt go, BUT... If I disconnect the tube for the MAP sensor, it starts and revs up running very rich, bogging down when you open the throttle (if you're gentle then it can happily rev up) backfiring and all sorts. If I have it running and reconnect the tube it dies.

Any ideas anyone? A weird one for sure.

Side note, i have actually continuity tested pretty much every single cable to every single item on this bike, everything goes to where it should and all sensors tested give the correct voltage/resistance according to the manual, including TPS, intake pressure sensor, crankshaft, Cam, atmosphere, water temp, injectors, coils, fuel pump and relay, and intake air temp.
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post #28 of 29 Old 09-02-2019, 09:36 AM Thread Starter
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FIXED IT!

So it turns out that the fuel strainer was split. That meant that the back pressure generated by the injector rail/pressure regulator forced the fuel out through the split back into the tank.

When you remove the tube for the MAP sensor the pump ramps all the way down to a point where the split can hold it in, meaning theres just about enough fuel for the injectors, and the engine can run.

Thanks for all the help guys, I could not have fixed this without your help and suggestions! It's a shame I've missed all if summer!
SteveW and Rep94401 like this.
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post #29 of 29 Old 09-02-2019, 12:36 PM
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WoW... nice find, never heard of that before. Glad to hear you've now got it sorted though.

For Tech Questions Bike Model letters and Country are more useful than saying the year, for UK owners anyway, as registration year is not always the year of manufacturer model.
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