Fuel Pressure? Fuel Injector problem?

[Willystyle56]

My cable came from Amazon and I didn't have any issues with it. I got the bike put back together and it has the same issues. Thinking of sending the injectors out for professional service. I used tuneecu and set the tps, now the idle is a little worse and bike wants to die, it did a couple times at stops. Issues are still at low rpm. Herky jerky take off, doesn't keep steady speed, even idling if i try to increase rpm gradually it wants to jump up 500+ rpm. Any other ideas? Bad tps? Better injector cleaning?

 

[Rick Morris]

Does it pop or backfire? Do a check of your vacuum lines as best you can. You can visually check and you can also check with the Tune ecu. Another simple way is to spray carb cleaner around the vacuum lines as it idles. If it smooths out in a certain area as you spray the carb cleaner there is usually a leak in that area. If it is a bad tps you should be getting a code I would think. I have not had any issues with my R3 so I would wait for some more experienced techs to respond here. Rough idle and poor response usually an air / fuel issue, I am still running a few carbureted bikes so I am guessing a bit with these new fangled computer controlled things we are ridding.

 

[Willystyle56]

It does backfire occasionally and does pop on decel. When I replaced the fuel filter I found the lines all falling apart and the pump spacer all cracked and coming apart. Wondering if a piece of rubber made its way into the injectors. Checked vacuum with carb cleaner with no luck. It can be checked with tuneecu? I've got a few carbed bikes myself and am appreciating the simplicity of them now.

 

[Rick Morris]

It does backfire occasionally and does pop on decel. When I replaced the fuel filter I found the lines all falling apart and the pump spacer all cracked and coming apart. Wondering if a piece of rubber made its way into the injectors. Checked vacuum with carb cleaner with no luck. It can be checked with tuneecu? I've got a few carbed bikes myself and am appreciating the simplicity of them now.

I agree, simple is good.

 

[Willystyle56]

Downloaded a different map today and the bike runs a heck of a lot better. I can actually cruise at steady speed now and take off in the low rpms isn't as jerky. I have a low idle issue now and bike wants to stall when coming to stop. Thinking stepper might need to be lubed and 12 minute tune done.

 

[Willystyle56]

Idle seems to be getting worse and the bike wants to keep stalling at idle. Other issues are still there. Everything else seems good so I'm still leaning towards fuel issue. Sending the injectors out to a professional and buying a known good used fuel pump assembly. I'll update with results.

 

[warp9.9]

@Willystyle56, when you say you used tune ecu to set the TPS did you just set the TPS or did you do a full ISCV reset? And the TPS is a rheostat it can get wear spots in it and not throw a ECU code.
Do not let her idle low as the oil pressure gets low 900 is a good idle in my opinion but then I had a bike that had a oil pressure gauge on it so I got the opportunity to see how the pressure reacts at idle speeds.

 

[Willystyle56]

I did the iscv reset. Set the tps to .6 and the stepper to .72. It might start around 900 then get lower until it dies. I've even tried turning the idle up in the map with no change. Slowly turned the throttle to check tps voltage and there didn't appear to be any flat spots or voltage jumps. Tps insides are blue so I believe that it's an updated one?

 

[warp9.9]

Ok so the first thing I would do besides cleaning and lubricating the stepper motor and all the linkage springs between them with WD40. Plus check the throttle body balance (if something is out by a lot it could point to a vacuum leak either lines or say throttle body mounts) I would also check the gap between the stepper motor roller The initial gap is .5mm of course they do not specify a tolerance so if your initial gap is to far off it could mess with the idle. In my opinion is everything on the bike has tolerances some you might have to use to your advantage to tweak her in. + or - .02 volts on the initial TPS set up and + or - .05 on the stepper motor movement.

I think the cleaning is important especially when you have tension springs involved in the throttle roller linkage

I would also like to know what your idles are set at in the map you loaded. and the Map number?

 

[EasTexRIII]

WD 40's good, But.............................

Why Boeshield | Boeshield T-9®

• Boeshield loosens rusty and corroded parts and is safe on paints, any metal surfaces, plastics, and vinyl

• T-9 flushes out dirt and old lubricants, displaces moisture, and penetrates moving parts

• Boeshield dries to a thin, waxy film that clings to metal for months

• Boeshield was developed by The Boeing Company for lubrication and protection of aircraft components