jdbaugh1

iTrader: (1)

You guys have any tips or tricks to help injectors seal up? I've taken off and reinstalled my fuel rail 3 times now to still have leaks. I cleaned the ports in which the seats sit. I've cleaned the seats themselves. Cleaned and oiled all seals prior to re installation and I still have a leak on the number 2 cylinder. Before I had a leak on the number 4 cylinder. I just can't seem to be able to get them to all seal up at once and I don't think it should be this difficult.

cluelessk

New seals?

jdbaugh1

iTrader: (1)

I ordered new insulators (I called them seats earlier) . I suppose I could try new seals on the injectors themselves if I knew where to get the right size. The injector seals look good and should be good as they are only a year old but I guess they could have been damaged.

FLASH1970

rock auto, crate engine depot, napa... should all have them. id check the seals to see if there are any rips or chunks taken out. LNF injector tip seals I heard are one time use seals.

jdbaugh1

iTrader: (1)

I should have clarified this is an 06 Cobalt, no DI. Definitely no rips or chunks as I inspected them very closely.

jdbaugh1

iTrader: (1)

Because these are aftermarket injectors the O-ring is different. Anyone know how injector seals are specified i.e. how do I find the correct replacement?

FLASH1970

contacting the injector manufacturer might be your best bet.

jdbaugh1

iTrader: (1)

Got a hold of them and replacements are on the way. Hopefully they are correct.

CannonBalt

They're not one time use if you are careful.

cluelessk

We replace every O-ring here at he shop any time we disassemble something. Usually A/C condensers.

jdbaugh1

iTrader: (1)

So right before taking my fuel rail off this last time I started having misfires at idle. Like I said I have had fuel rail problems before but they only caused missing on startup then went away fairly quick. This last time it seemed like something changed all of a sudden. Right after a short 3rd gear pull is when it starting idling really high and felt like it was missing on a cylinder (only at idle). Opening up the throttle partially it ran fine cruising as I drove it back to park it.

When carefully taking off my fuel rail I notice a single injector is completely missing it's lower O-ring. I am having a hell of a time coming up with a scenario that would lead to that. But the missing O-ring combined with my car all of the sudden missing on a cylinder I am wondering if it somehow got sucked into my head causing a massive vacuum leak. I checked with a borescope and everything and can't seem to locate it anywhere in the intake port in case I somehow knocked it off when removing the fuel rail.

Now I have new O-rings and insulators on their way but I am concerned about the missing O-ring. I don't really know what else to do though because it's not like it's practical to take the whole head off to extract remains of an O-ring that may or may not be there.

cluelessk

Pretty sure an o ring would get sucked through. Wouldn't last long in the cylinder.

jdbaugh1

iTrader: (1)

That's what I was thinking. So I guess I'll just replace all the O-rings, reassemble and hope for the best.

ECaulk

iTrader: (6)

Considering an o-ring can compress, I wouldn't be to worried, take a look into the cylinder if your borescope can get there.

If you're cat-less there is a good chance it just went straight through no issue.

jdbaugh1

iTrader: (1)

Replaced all of the lower injector seals and the insulators. It seems to be vacuum leak free. I did the ol carb cleaner test twice and it didn't screw with the idle. I took it out for some pulls and it was raped ape status and my AFR went from 12 to 13 during pulls so I'm wondering if the leaking seals were also causing a significant boost leak.

Cobalt_noob

This just strikes me hilarious for some reason haha!

jdbaugh, did you run in to any issues later on down the line? Or did the orings do the trick??