fuel injection problems

johnA · #1 PostAuthor: **johnA** » Sun Sep 27, 2015 7:45 pm

hello gents does anyone on here know of anyone who can sort motorcycle fuel injection. been out on my gpz1100 today started running rough like stuttering at certain throttle positions so i'm guessing it's the injection system.
many thanks in advance john

z1bman · #2 PostAuthor: **z1bman** » Sun Sep 27, 2015 8:17 pm

what model is it ?

johnA · #3 PostAuthor: **johnA** » Mon Sep 28, 2015 7:47 am

Sorry forgot to say it's a 1983 gpz1100 A1 with standard exhaust system.

Pigford · #4 PostAuthor: **Pigford** » Mon Sep 28, 2015 8:11 am

Check ALL electrical connections first.... maybe loose or corroded :?:

z1bman · #5 PostAuthor: **z1bman** » Mon Sep 28, 2015 5:19 pm

is the ecu flashing a code ?

johnA · #6 PostAuthor: **johnA** » Mon Sep 28, 2015 8:37 pm

no mate no flashing was thinking it could be the injectors because when i got the bike the tank was orange with rust on the inside and the filter was the same.it only judders on part throttle when its fully open it runs fine. thanks for the replies john

z1bman · #7 PostAuthor: **z1bman** » Mon Sep 28, 2015 9:08 pm

did you clean out the pressure release valve in the tank. have you tried new plugs?

johnA · #8 PostAuthor: **johnA** » Mon Sep 28, 2015 10:34 pm

yes mate all cleaned new filters and new plugs.

z1bman · #9 PostAuthor: **z1bman** » Mon Sep 28, 2015 10:45 pm

have you still got the side stand switch fitted ?

johnA · #10 PostAuthor: **johnA** » Tue Sep 29, 2015 6:47 am

Yes mate the side stand switch is still on the plunger is working ok. Does it want checking for continuity.

z1bman · #11 PostAuthor: **z1bman** » Tue Sep 29, 2015 7:27 am

disconnect / bypass the switch. very common thing to cause running problems

johnA · #12 PostAuthor: **johnA** » Tue Sep 29, 2015 8:12 pm

thanks for that will try it.

RAYZ1 · #13 PostAuthor: **RAYZ1** » Fri Oct 02, 2015 9:31 pm

take each injector out and clean them with carb spray, if you can connect them up to the harness and blow through them as you crank it over.

It worked a treat for 2 bikes that I had with gummed up injectors. They were MVs with a 5 hole pentagon spray pattern ,

after some carb cleaner and blowing through I eventually got a nice even spray pattern on some tissue paper. After that the bike ran fine. So fuel injection systems can gum up just like carbs and run like sh*t.

johnA · #14 PostAuthor: **johnA** » Sat Oct 03, 2015 8:00 pm

thank you for the reply mate.

fuel injection problems

fuel injection problems

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