injector issues

[JDMSLIK]

Hey guys got some injector issues.
So the issue, doing the 550 sti swap into the legacy rails for the rob tune. Replaced the o-rings and 3 out of 4 injectors are gushing somehow causing the engine to hydrolock upon start up. Tonite I'll be confirming where they are leaking from by mounting them on a spare rail and lines off the intake.
Now I'm a senior tech at a subaru dealership, please no hate. I understand, but I got a good rep partly cause I always consider myself to be a student.

I've done quite a few injector jobs and never have I seen 3 injectors leaking. Here's the questions:
-could the fpr be jammed causing abnormally high fuel pressure? but it was running fine prior to the swap
-I bought these used and I'm wondering if the clown I bought them off maxed them out, would that cause them to stay open?
-is there anyway I installed them wrong, Would the caps be pushing on the pintle caps causing them to stay open

Thx for any input, Just wanna get this thing going smoothly without to much headache. And No I don't want to get them flow tested immediately......I just bought some rpf1's and the funds are hurting eh:)

[wtdash]

Hi,
Please clarify - What engine and any mods are you/we dealing with? With the Rob Tune (Way to go!) this is an SS/TW swapping in the EJ20 ECU, I'd guess.

I read the issue is w/leaking and too much fuel...but just to double-check:

The 550's must be installed in the '92-94 NA SOHC rails. If you've got the correct rails, did you get the correct O-rings? This LINK shows there are only 2 per injector.

And here's pic of the O-rings installed:


If you check the resistance on the injectors, they should be 10-12 OHMs? You probably have the FSM w/the correct #'s.

TD

[JDMSLIK]

ej22t, 1993 legacy turbo, 5mt
tmic, tdo4, straight pipe, stock boost
sti suspension swap and a bunch of other junk

I can't confirm the fuel rails were out of a 92-94 legacy. We have a shed with a bunch of old engines in them. The rails came off a ej22 sohc with the old style valve covers. The 550 cc injectors fit very well into the rails and looked very similar to the injectors I pulled out of them.

That picture is the same as the injectors I have. And thx for answering an unmentioned question. The parts look up was a little vague with the o-rings. Was sure there was only 2 but thx for the confirmation. I ended up going through the box of o-rings and installed the two that fit best. The injectors are not leaking externally just internally so the bottom o-ring could still be a culprit. The part number for the o-ring installed on the bottom #16698AA080.

Ya definitely checking the resistances tonight. Probably gonna mount the rails to another set of fuel lines externally. I'll try to get a video of it.

[JDMSLIK]

K checked the resistance, every injector is roughly 10.2-10.4 ohms. Made a cool tool to check resistances easier. Just cut off an injector plug, busted the tab off and crimped some spade connectors on the end. Real easy to grab with the gator clips and the plug just slides right on.

Anyways, hooked up the rails with injectors to a set of fuel lines.



Absolutely no leaking after cycling the ignition to on about a dozen times. Wondering if the ecu is telling the injectors to go wide open on start up? Gonna check voltage and possibly duty cycle to the harness on start up.

[JDMSLIK]

wtf

with the key out of the ignition I got 12v going to the injectors, that can't be normal

[JDMSLIK]

ok 12 volts is normal.

hooked up the injectors to the fuel line and jumped them to the stock injector plugs on the harness. Outside of the car they spray fine with no o-ring leaks.
I then installed the rails and injectors into the intake turned it over and it hydrolocked again. Spark plugs are soaked. I am stumped

[wtdash]

No more ideas over here....hopefully the smart guys will chime in.
Td

[Alphius]

Still on the stock ECU or RobTune is already in? Got a noid light?

[JDMSLIK]

ya no worries TD, this one is tough....or I'm forgetting something really simple lol.

It's on the rob tune ecu. Got a thread going on nasioc that Rob responded to. Going home and checking part numbers for the rails. They're not leaking but who knows now. Gonna also bring home some noid lights, timing light and fuel pressure guage. Kinda wondering if the injector is firing too often or way off.

[JDMSLIK]

HA.....friggin maf, beware of junkyard electrical parts

[wtdash]

MAF was causing the issue? You had the green label JECS or AUTECS, correct?

BTW, I've bought 6+ pull-n-save MAFs and never had an issue...sorry you did!
TD

[JDMSLIK]

Ya man, black plastic autecs (looked again thought it was a jecs) with a green label

Should've thought of it right away. There was a small indentation on the top box. I know these guys pretty good and I asked if there was an issue I could exchange it. Gonna call them up tomorrow. Just bizarre though, never seen a faulty maf overfuel like that.

[wtdash]

read this POSTw/similar issue and MAF was the cause...must be 'going around'.

Td

[Legacy777]

Just an FYI for others, the 92-94 non-turbo rails will have the injectors oriented at a 90 deg angle vs. slanted

92-94 non-turbo rails
http://www.main.experiencetherave.com/s ... P_8938.JPG

90-91 non-turbo rails
http://www.main.experiencetherave.com/s ... P_2523.JPG

turbo rails
http://www.main.experiencetherave.com/s ... P_5952.JPG

[SiCkSTi04]

^Josh, some reason your links are not working.

[Legacy777]

Yeah I've got issues with my ISP right now. I've got a tech coming out on Wednesday, so hopefully by Wednesday afternoon they'll be working again.

Sorry about that.

[Dave_J]

Yeah I've got issues with my ISP right now. I've got a tech coming out on Wednesday, so hopefully by Wednesday afternoon they'll be working again.

Sorry about that.

ISP issues suck, unless your the one to fix it. Thats my bread and butter. Sorry Josh, If you were closer I could help, unless its a cable modem. I have a Fluke DSL test meter that will test anybodys modem connection but not cable modems.

[Dave_J]

I don't think we have the adapters to clean and test Subie injectors. We have an older ASNU -01 ultrasonic cleaner and flow bench. I'll have to chech to see if we can test these types. We can do Ford, GM and Mopar.

[Legacy777]

It's a cable modem

Normally it's pretty reliable....but with more people moving into the town homes around me that have been empty for years there are splitters entering splitters at the line and the signal is just too weak. They need to put another distribution node.....there may be another issue too..... Hope it gets fixed today.