Bench testing injectors

[rodekyll]

I'm not firing my sx injector.  DX fires and the bike runs on the one pot.  Fuel pressure is present.  Spark is present on both sides, and if I squirt ether into the sx intake it fires until the charge is gone.

Pulled the injector, toggled the fuel pump and hit the starter -- runs on DX.  SX injector doesn't squirt.  Tried two more injectors I had lying around -- no joy.

Checked the injector wires -- my test light glows bright on one pin.

Pulled the plug from the DX side and repeated the tests on all three injectors -- no squirt.  In addition, when holding them in my hand I feel no click.


Also, looking at the map -- the injectors are fed a common hot via fuse6 and the fuel pump relay.  Pin 13 (looks pink in the map) controls the SX pulse.  Pin 6 (light blue) goes to the DX.  I do not see any direct grounding and really don't expect any.  I'm assuming the pin 13 and 6 connections ground to trigger the injectors.  So I do a direct wire-up to the battery and still can't fire the injectors.


I'm not getting how I've got three dead injectors.  Am I missing something in my test technique?  Can these be disassembled?

[rodekyll]

I tried it with the known good injector plug while it was hanging out in space -- no squirt.


Buuuuuuutttttttt . . .  . . .   I forgot the most basic test, probably because I'm working alone and there's nobody around to hold my beer.  I very carefully held one of the injectors in the palm of my right hand and then with great precision whacked it smartly with a ballpeen hammer held in the left.  Viola! (means large fiddle)  It works now.   Nice, even cone of squirtum.  The only part I don't get now is why they assign symphonic instruments to Aha! moments.

[Kiwi_Roy]

You are right, both injectors are alive on one side, the ECU pulls the other side to ground with a JFET

I'll e-mail you something

Roy

Oh, I see you already fixed it in the approved manner  ;-T
I guess it was just gummed shut.

Just as well I sent my stuff to someone else  ???

[beetle]

Pedant mode: it's 'voilà', not viola. Ahem.

BTW, you can test injectors with GuzziDiag.

[rodekyll]

What choices do I have with guzzidiag?  My hammers come in 12, 18, 22, and 48oz.    :D

Seriously though -- I have diag software.  All it can tell me is that the trigger works.  It can't check for flow.  So it would insist it's good without having a squirtable unit.  Without getting all volumetric about it, I'll just say that I hate it when any of my units won't squirt.

[lorazepam]

a trip to an ultrasonic cleaner will break that goop loose most of the time.

[rodekyll]

I might find me one to clean up my two spare injectors.

[lorazepam]

I have one from harbor freight. With coupon it was around 60.00 and is the exact same one that Hornady markets for firearms for a lot less. It works great for all kinds of cleaning.

[beetle]

But a hammer is much more fun.  :D

[Chuck in Indiana]

a trip to an ultrasonic cleaner will break that goop loose most of the time.

I'm not sure he'd want to put his "unit" in that.. :o

[rodekyll]

After having been married I'm immune to all sustained, ultrasonic noises.  Also to hammers.

[redrider]

Cut the ends off of the old lamp cord but leave one end joined and split/slit the other end enough to attach alligator clips with enough spread for battery hook up. Touch the narrow end to the injector several times. Injectors use 5 VDC and the direct 12 VDC from the battery will shock them into submission.

[rodekyll]

Cut the ends off of the old lamp cord but leave one end joined and split/slit the other end enough to attach alligator clips with enough spread for battery hook up. Touch the narrow end to the injector several times. Injectors use 5 VDC and the direct 12 VDC from the battery will shock them into submission.

My injectors have a native +12v from fuse 6 at one post.  The pulse happens when the ecu triggers the other post to ground.

[pauldaytona]

well they are not made for constant 12volt. Just a moment does no harm.

[rodekyll]

well, now I'm confused.  If they don't do 12v, why are they powered directly from the fuse?