Injector Stuck

[3p141592654]

One of my recently rebuilt injectors from RC Engineering is stuck shut. There was actually two but one fixed itself after about 10 minutes of idling. Before I pull the rail and send the injector back to RCE, I thought I might try running 2A at 6V DC through it to see if I could simulate WOT and break it free. Has anyone run into this problem before? The injectors sat for about 2 months after the rebuild before I fired the engine.

By the way, it ohms out okay at 3.4ohms, and swapping injector connectors with the adjacent injector did not change anything, so the wiring is okay.

 

[Nick M]

Do not hold the injector "on". Max on time is still only milliseconds. A quick on and off. I have seen electrical solenoids stuck from contamination, but I don't see it with a new unit.

 

[IJ.]

Rough and ready would be to pull the injector and give it a gentle tap against the rail then try it.

If that doesn't correct the issue send em all back to RC.

 

[3p141592654]

Thanks for the advice. Seems like the best course of action is to send them back to RCE... what a PITA!

 

[suprashy]

How did u determine an injector was stuck? I know the TSRM says to use a scope, or even touch each injector with fingers, but I was wondering if there's another way. I've installed new ones, and am thinking once shes' ready to start, how to determine if they work individually. Thanks!

 

[3p141592654]

It was missing, narrowed it down to cylinder #1 by pulling plug wires and listening to the engine. Plugs are brand new and lots of sparks flying, so ignition is okay.

Then used a stethoscope to listen to each injector. #1 was silent. Pulled the injector connector and checked injector resistance with ohmeter. 3.3 ohm measured so that's okay. Checked wiring by swapping injector connectors with #2. Cylinder #2 continued to work with #1 connector, so connector okay. Only thing left is the injector itself!

 

[IJ.]

3P: Lucky it stopped totally instead of partially and leaning out enough to blowtorch a piston (ask how I know this)

 

[Suprapowaz!(2)]

RC Engineering injector gets stuck and this thread gets swept under a rug. Some people come here and ask about Venom injectors and guys come out the woodwork to call them junk. Hmm.

 

[IJ.]

I don't think it's "swept under the rug" at all it's still posted out in the open there's just not a lot to discuss he'll send em back RC will repair/replace and it'll be fine.

You have to admit it's a fairly rare and isolated incident.

 

[3p141592654]

Yeah, I'm surprised. Trying to think if it was anything I did, but you know, they sat in the box for two months, then I plunked them in, ran the fuel pump for a couple of minutes to check for leaks, then let them sit another month. Fired it up and was missing on two cylinders, then one un-stuck by itself. The other wouldn't budge, even after I pulled it out on the bench and did CPR (with 6V power supply :biglaugh: ).