grind down the post some more. you cant really grind them too far. lube up only the top of the injector, install them in the rails, only far enough for the complete o-ring to be in. let them dry so they are stuck in that position, lube up the bottom and install. more than likely you need to grind down the posts more, can you snap a pic of it?

 

I don't think I grinded them down enough. My dad's not too crazy about that idea so I'll have to do it when he's not home tomorrow. Well I know they're not grinded down enough because the injectors were pretty much out of the manifold while all they way in the fuel rails.

The worst part about this is that I decided not to check to see if it was leaking until I had already put the runner and plenum back on so I have to take it all back off. Shows the inexperience of a 17 year old huh? I really appreciate all of your help and I'm really hoping that I can get these injectors to work soon.

 

definately check for leaks before you put the runners/plenum back on. wiggle them around too, make sure they wont start leaking due to vibration. grinding the posts down is not a big deal at all it just lowers the rails.

 

hey man,I'm 35 and never ran into this problem.
I do know now that I would rather buy factory gm injectors than go through that headache.
QUICKSTYLE: Your avatar pic makes me laugh everytime I see it!
Thanks,and yeah SCREW them H@%*^'S!

 

Yeah I know its not a big deal, but my dad just doesnt like messing with things like that I guess. He's just mad at me for not buying a completely stock replacement injector. It would have made it a lot easier I suppose, but I just didn't have the money for them. And I will definitely wiggle them around once I get everything back on and whatnot.

 

stock replacement injectors are junk and they cost alot. your dad will find out in the end that you made a good choice, even tho it took alot more labor, but hey labor is free.

funny thing about my sig... even tho im not a big fan of the imp0rt scene, i drive a boosted crx daily can't beat a car that gets 30mpg average, and runs a 12.2 in the quarter.

 

The umbrella seals on the injectors tore. Are they necessary?

 

can you post some pics of everything from the torn injector seal to the grinded intake posts?
This would help.

 

You should of gotten the original GM injectors, I heard after a while they mess up cause your ECM goes crazy.. LOL. But anyway when putting your injectors in make sure the O rings fit in nice and snug not all bent up that will cause a big problem, also about your idle, check your air idle valve that will cause it to not start unless u give it some gas or if you stop it'll shake and cut off....let me know what happeneds good luck

 

BAH. Not the case. He'll be fine as long as they're high impedance.

 

Ok guys, I don't even know where to start. I can't believe what a pain in the *** this is becoming. I shaved the posts down about 1/4 of an inch and they would still leak, so I kept grinding. I ended up grinding way to far and the fuel rails would sit on the manifold and hit the runners in a few places, so I grinded those to where it would fit, and it still leaked. I'm getting a new manifold and I guess I'll try it again. Any help or ideas on what to do about it leaking would be great.

Oh and when I took off the manifold, it wasn't a very pretty sight. It was like buildups of sludge everywhere. I guess I'll clean that up and just hope there is no extensive damage in the block or anything.

 

before you replace your manifold, can you take a picture of what you done to the posts and upload it on here for us, you might not need a new manifold, this is a very common thing to do to these manifolds, and i've never seen one turn into what you are describing.

 

I can try and get a picture of what it looks like, but it's kind of hard. Do you want me to put the rails and runners on for the picture, or just the posts? I can't believe this is happening, and it's not even a small leak. It's just like pouring out.

 

no leave the rails off for the picture. even if you did grind them down too far, the manifold will still be usable. just need some washers under the rails. but take the pic and let us see what you got going on.

 

I don't know how well you can really see in the pics, but the mounting posts are no taller than the ports for the runners now.

 

wow. you cut way to far. how many turns of a bolt can you get to go into the portion that is left? if you can get about 3 or more turns in there, you might still be able to still use the manifold, just need to throw some washers on top of the posts. with them being cut that far down you were still leaking? thats strange... might be because it was being force so far down that it was pinching the o-rings and letting fuel leak by. before you attempt this again on another manifold, try to get this one to work with the washers on the post and use it as a guide to where to cut the new manifold, or just keep with washers on this manifold.

you need to find out where its leaking, put the injectors fully set into the rails then slide them into the manifold no further than the thickness of an o-ring past the injector port. by doing it like this, it should not leak. and also show you how far you should cut the new manifold. or if you would prefer to not have to go thru this again, you can always get the older bosch style ford injectors where they accept the injector clips to hold them in rails.

i attached a picture of how far you should have cut the posts down. looks to me like you cut a little over a whole inch off.

 

I did use washers to put them in. I couldn't even use the original bolts for the rails, and yes it was still leaking with them that far down. There was no play in the injectors so it surprised the hell out of me. Neither my dad or myself could believe that it still leaked, and still leaked a significant amount. I'm going to get the new manifold regardless, because I'm getting it with new runners, plenum, tb, and fuel rails for $150. My runners are dented and everything anyways.

 

Not sure which injector o-rings you are using, but they have to be GM ones. Frod injector o-rings are smaller and will leak.

RBob.

 

Went to Advanced and got the ones specifically for my car, so I'm assuming those are GM ones.

 

even though i've heard people say this and post pictures of the difference, and they are different...... i have always used the o-rings that came with the ford injectors, mine have never leaked. im pretty sure this guy bought the same injectors that i do... the guy from ebay that sells them for $120?

wonder if the inner diameter is a different size also, and thats where you are leaking from using the GM o-rings... but im just guessing at that, maybe compare the two.

 

Yeah, I got them on ebay from precisionautoinjectors. Great guy. And they've leaked from both sets of o-rings.

 

I've been watching this for a little while. There's a gazillion guys out there running SVO/Ford/Bosch injectors here on TGO, and everyone says they're a tad short, but no one has had any problems, or needed to cut down the fuel rail mounting parts of the manifold. This thread is the first I've heard of it.

Good luck with everything. We're pullin' for ya.

 

Yeah, I've read a lot of those threads. Everyone else seems to have just swapped them out and it was perfect. Now my dad is just really angry because he thinks I wasted money on a crappy part because our neighbor's son is a mechanic at a Ford dealership and says he junks these injectors all the time. It is becoming extremely frustrating though.

 

I was reading through some of the advice QuickStyle has been giving me and I overlooked something before. When I put the injectors in, I lubed them with some tranny fluid, but I didn't really let them sit there and dry and I had everything back together pretty quick so I could test to see if it was leaking. I don't think they were really in there well cause I was moving them around a lot, so I think the o-rings might have been screwed up from that. Well when I have time on Sunday after work, I'm getting back on it and I'm going to be extra careful and let them dry in place first. Thanks everyone. I'll let you know how it turns out when I'm done.

 

Still nothing figured out?

 

Are you sure you are using the correct injectors? I just replaced the injectors on a 91 Z today using the Ford 19lbs and they fit right down and seated fine. I reused the old clips. I didn't have anny issues with them being to short. Same with the 24#s on my 88 IROC.

Also the replacement o rings I got made by Standard are Ford O rings, not the GM ones. You have to get AC Delco blue O rings to get the correct ones. That said, my 88 has Ford 24 Lb injectors using the Ford o rings and it's never leaked in the 3 years since I put them on. I also never used oil of any kind. Just snugged them in slowly and carefully.

 

I just put the design III in my roc and didnt have any problems.I did have to get the blue gm orings.I also took my manifold of and took it to my buddies shop to mill down the posts.Once you get them in and everything right you will be very happy.

 

I've used all 3 kinds of o-rings and they all leaked. I couldn't put up with it anymore. It shouldn't take this long to swap out injectors, so I bought a new manifold and returned those injectors to the guy I bought them from on ebay and he serviced mine. I haven't installed them yet, though, because while I was waiting to get them back I decided to do a few other things and just finished that, so I'll have them in within the week if work and school don't get in the way.

 

Just to make sure I'm understanding this right, you have to remove the upper plenum just to remove the injectors? Runners too?

I'm looking at removing my injectors and sending them to http://fuelinjectorconnection.com/ to get rebuilt.

 

Yes you have to remove the plenum to get the injectors out. You don't have to take the runners out, but it makes it much easier if you do.

 

Also, the injectors simply slide into the manifold sealing with an O ring on the injector, but they are held into the rail with a clip that needs slide about a 1/4 turn to allow them to release. HTH

 

I've read your thread and would like to know if you solved your problem? Car running now? Thanks.

 

Much better..but still has a cold start problem. Not much of one, though.

 

Hi All,
I replaced the OEM injectors on my '87 IROC with the Bosch lll design, from Jon, at FIC. About a week after I replaced the injectors I developed a leak from one of the injectors at the fuel rail. After disassembling everything, I discovered I must have pinched the o-ring, because I found a piece of the o-ring (on the manifold) that had been blown out of the rail from fuel pressure. After carefully replacing the o-ring and checking the rest, it has been fine. The Bosch lll made a huge difference in idle and drivibility.

CG

 

is it nessacary to replace the metal clips that hold the injector in the rail? most of mine crumbled when i removed them. will they work ok with out them?

 

Do you want to take the chance of developing a gas leak on top of your hot engine?
They're cheap at GM.

 

Need to put my 2 cents in. We have sold HUNDREDS of the design lll fuel injectors. First of all YOU DO NOT NEED TO GRIND DOWN ANYTHING!!. It is a known fact that these injectors are a little shorter than stock. All you need to do is install a second o-rind on the bottom, THIS WILL TAKE CARE OF THE 1/4 inch in the length!! very simple, you install into the intake manifold first!! Then the fuel rail AND YOUR PROBLEM WILL BE SOLVED! We send out our design lll's with written installation instructions, a picture of where the 2nd oring should go, and we also send the additional orings that you need. Just follow these simple instructions and the problem with the injectors will be solved. GUARANTEED!! A copy of these instructions are included with every set of Design lll's that we sell.

www.southbayfuelinjectors.com

 

can someone post the pic, i can't open from my computer