1992 LT1 injector reinstall
Thread Starter
Intermediate
Joined: May 2006
Posts: 37
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From: Glendale California
1992 LT1 injector reinstall
Hi- need a little help. Long story short, had the injectors cleaned and just got them back. (Used InjectorExperts.com) They are tested and now ready to install..
watched a few YouTube videos... but didnt see anything that looks like these 2 "spacers" what are they for?
Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
Those look like the clips that retain the injector into the fuel rail assy. Only reason I can see needing them is if you want to watch the injectors spray while cranking -so the fuel pressure wouldn't shoot the injectors out of the rails.
Doesn't matter which injector goes in what spot.
Doesn't matter which injector goes in what spot.
Team Owner
Joined: Jul 2004
Posts: 28,475
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From: Hartford WI
Racer
Joined: Nov 2005
Posts: 258
Likes: 4
From: Iuka Mississippi
Slide both those clips to the left. Install injector and then slide them in a position as to lock the injector onto the fuel rail. They have to be in place as that is the high pressure fuel side. While replacing 16 injectors on a ZR-1 I found that a light coat of oil or petroleum jelly on the "O" rings will help.
Last edited by RICHARD TILL; May 23, 2017 at 04:00 AM.
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Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
They don't have to be in place. The injector is sandwiched between the rail and the manifold when the rail is installed and bolted to the manifold. How could it come out? It can't. Only time you'd need the clips is if you want to pressure up the fuel rail w/the rail not installed on the manifold. 
Burning Brakes
Joined: Apr 2009
Posts: 1,185
Likes: 33
From: Charlotte Michigan
The clips hold the original multec injectors in place and prevent fuel leakage. If you use a Bosch 3 they are not needed as they have two o-rings. When I replaced my 3's with Bosch 4's from FIC that had a single o-ring I needed them again to maintain the position and prevent leakage.
Just put my multecs back in yesterday to send my 3's 4's ti FIC to be checked. This is in a 1993 Ruby.
I place mine in the rail first and using the clips they don't fall out. Use plenty of vasalein to insert both rails down into the intake manifild at about the same time. The clip helps align the positions into the hole. When I install the 3's I place them into the manifold first. Always use plenty of vasalein so as not to damage th o-ring.
Just put my multecs back in yesterday to send my 3's 4's ti FIC to be checked. This is in a 1993 Ruby.
I place mine in the rail first and using the clips they don't fall out. Use plenty of vasalein to insert both rails down into the intake manifild at about the same time. The clip helps align the positions into the hole. When I install the 3's I place them into the manifold first. Always use plenty of vasalein so as not to damage th o-ring.
Last edited by scotth48; May 23, 2017 at 06:23 PM. Reason: Mis spelled word
Safety Car
Joined: May 2006
Posts: 4,290
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From: Salem NH
On a Miniram, and some TPI intakes if you omit them with Bosch-III injectors you will get an epic fuel leak.
The fuel pressure pushes the injector too far into the bung, and it leaks fuel out the top.
I don't know if the injectors bottom out on the LT1 before they leak on the rail ?
-- Joe
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
They don't have to be in place. The injector is sandwiched between the rail and the manifold when the rail is installed and bolted to the manifold. How could it come out? It can't. Only time you'd need the clips is if you want to pressure up the fuel rail w/the rail not installed on the manifold.
This happens a lot on thirdgen.org, where intake and injector swaps are a bit more common. I'm not as familiar with injector swaps on LT1 intakes so I don't know if it's possible.
-- Joe
Team Owner
Joined: Aug 2004
Posts: 21,543
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From: Park City Utah
Depending on the o-ring spacing on the injector, the injector might leak at the rail before it bottoms out on the intake bore.
This happens a lot on thirdgen.org, where intake and injector swaps are a bit more common. I'm not as familiar with injector swaps on LT1 intakes so I don't know if it's possible.
-- Joe
This happens a lot on thirdgen.org, where intake and injector swaps are a bit more common. I'm not as familiar with injector swaps on LT1 intakes so I don't know if it's possible.
-- Joe
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
Notice the Bosch-III injectors do not have registers for the injector clips. So you need to use a spacer to take up the extra slack.
-- Joe
Last edited by anesthes; May 24, 2017 at 01:04 PM.
Advanced
Joined: Feb 2017
Posts: 86
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From: San Antonio, Fl Florida
I just happened to run across your post, I know its an old one, hope you're still around, I just finished installing all 8 of the Bosch III injectors and do have a leak in 2 of the injectors coming out of the fuel rail. Is there a way to correct it. All of the O-rings were well lubricated.
Moderator
Joined: Jul 2005
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From: Parrish FL
St. Jude Donor '06 thru '26
I just happened to run across your post, I know its an old one, hope you're still around, I just finished installing all 8 of the Bosch III injectors and do have a leak in 2 of the injectors coming out of the fuel rail. Is there a way to correct it. All of the O-rings were well lubricated.