Topic: Issues with 19# injector swap

[aw12345]

Scott I would do a pressure drop test to make sure that the injectors are good and  they all spray a fairly even volume of fuel

[FourbangerYJ]

Well I was starting to take the fuel rail off and decieded to swap the stockers back in. (good thing I took Jeffy's advice and numbered them). She fired right up and runs like a champ!

[Jeffy]

Well I was starting to take the fuel rail off and decieded to swap the stockers back in. (good thing I took Jeffy's advice and numbered them). She fired right up and runs like a champ!

So swap in the other set and see if it works.

[FourbangerYJ]

So swap in the other set and see if it works.

I did (page 3) same results as the first set. Wierd having 2 sets that didn't work out. 

[Jeffy]

I did (page 3) same results as the first set. Wierd having 2 sets that didn't work out. 

Were you able to tell which injectors had issues?  You can mix and match the two sets.

[sharpxmen]

Were you able to tell which injectors had issues?  You can mix and match the two sets.

x2

or even better i would make myself an injector pigtail and check them individually - jump the pump and activate one injector at a time, check how they atomize and if they leak and also pair them (that means keep them open for a specific amount of time and then see how much they release - the ones that release the same amount are the ones you want to use). You can even tell if they are flowing at specs, so if you keep one open for 5 minutes, weigh the amount of fuel that was released and then times that by 12 it will give you the flow in lbs/hr - in your case they should flow about 18lbs/hr since they are at 39 psi on the YJ fuel rail (the rating you have of 19# should be at 43.5).

you might want to have a good charger connected to the battery if you decide to do this so you make sure the pump delivers the same amount from beggining to end.

i'm really interested in seeing what the problem is though, weird that you had 2 sets doing the same thing.

[FourbangerYJ]

Were you able to tell which injectors had issues?  You can mix and match the two sets.

Not really. I would need to have them flow tested. I wonder if there is not enough pressure to run them. It ran like it was not getting fuel. After 2500RPM it was flat...no power at all. Plus it sounded real bad.

I am glad that it works with the OE stuff. I was getting worried I jacked something up.

[Jeffy]

Not really. I would need to have them flow tested. I wonder if there is not enough pressure to run them. It ran like it was not getting fuel. After 2500RPM it was flat...no power at all. Plus it sounded real bad.

I am glad that it works with the OE stuff. I was getting worried I jacked something up.

They all were bad?  If it was one or two you could have localized them by pulling the injector plug.  Like I said before the engine will idle with 3 cylinders but sound funny and be really down on power if you try to drive it.  I'd be surprised of all 8 of your injectors are bad.

[sharpxmen]

They all were bad?  If it was one or two you could have localized them by pulling the injector plug.  Like I said before the engine will idle with 3 cylinders but sound funny and be really down on power if you try to drive it.  I'd be surprised of all 8 of your injectors are bad.

maybe the flow is different, that would explain it - fourbanger, what P/N are these?

[Jeffy]

maybe the flow is different, that would explain it - fourbanger, what P/N are these?

Bosch should be universal with the body color code.  What was the donor vehicle as well?

[FourbangerYJ]

maybe the flow is different, that would explain it - fourbanger, what P/N are these?

Ford P/N F4SE-A1B

They all were bad?  If it was one or two you could have localized them by pulling the injector plug.  Like I said before the engine will idle with 3 cylinders but sound funny and be really down on power if you try to drive it.  I'd be surprised of all 8 of your injectors are bad.

I would be surprised too. I didn't feel like messing with it. So after pulling the spark plugs and not finding them all black I said screw it and just put the OE's back in. When I get more time to screw with it I might give it a go by checking it one by one.
First I am going to instal the PD kit. It should be here today or tom. (fingers crossed)

[FourbangerYJ]

Bosch should be universal with the body color code.  What was the donor vehicle as well?

I was told Cobra Mustang. They are yellow design III.

[FourbangerYJ]

They all were bad?  If it was one or two you could have localized them by pulling the injector plug.  Like I said before the engine will idle with 3 cylinders but sound funny and be really down on power if you try to drive it.  I'd be surprised of all 8 of your injectors are bad.

It just dawned on me what you meant. If it runs like junk when I start it. It will run like junk when I pull the bad plug. If it gets worse I pulled a good one.  When I get some time I'll see if I can find the bad one(s).
I'll bet that is why the CEL came one too. One of them is tripping it. No light with the OE's in there.

[sharpxmen]

Ford P/N F4SE-A1B

i can't confirm this but I found these injectors as equivalent for a Bosh P/N 0-280-155-700 out of a 5.0L v8 with a flow of 18.25lb/hr@43.5psi - which means on your YJ at 39psi you are actually getting a little less than stock (17.28lb/hr) - if i were you i would compare the 2 (stock and the ones you have) and see which one flows more (and what is the difference). Again, can't confirm this as the specs are off the bosch one and not the Ford P/N you listed.

[Jeffy]

I think the real question is why is he the only one having trouble?