My fuel injectors are not seating all the way into the lower intake plenum. What is the installation process? I usually just wrench down the fuel rail and call it day but that didn't work this time.

Take them out and inspect the threads on the injectors and head threads, you may have some dirt in a thread, that's all it can take, or did you buy new injectors? They could be the wrong ones, compare them to the old ones and see if they are exactly the same.

other than that I got nothing.

Steve

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Technology is great when it works,
and one big pain in the ass when it doesn't



Detroit iron rules all the rest are just toys.

My mechanic says he uses a thin greasing. By the way, some GM cars have a thin lock ring for each injector (I didnt look for the Fiero).

quote Originally posted by 84fiero123: Take them out and inspect the threads on the injectors and head threads, you may have some dirt in a thread, that's all it can take, or did you buy new injectors? They could be the wrong ones, compare them to the old ones and see if they are exactly the same. other than that I got nothing. Steve

I don't know what threads you are talking about.

quote Originally posted by 84fiero123: Take them out and inspect the threads on the injectors and head threads...

I thought the injectors just "pushed" into the bores, and were sealed with an O-ring?

What motor are you working on? 2.8, Duke?

Using stock injectors, if you pulled them after any length of service, replace the O-rings with new ones resistant to ethanol. A little KY Jelly on the O-rings will make them slide in easily. You don't need the lock rings. They are actually only needed when the manufacturer shipped the rail and injectors to the engine assembly plant. It kept everything together. The fuel rail will hold the injectors in place. Be sure the hats (caps) on the ends of the old injectors aren't still inside the lower manifold if you're installing new injectors.

check orings on injectors, preferrably replace them, add some dielectric grease and push them in, they should seat perfect.

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Garage:

**2014 impala LT 3.6L 305hp**

**1986 Fiero 2m6 4spd**

A long shot perhaps but maybe your new injectors have two mounting grooves for the loaking tabs, and you have them on the wrong ones? The Accel injectors I bought were like that.

This below might help
2.8 Injectors are not threaded. Personally, I like using the lock rings, even though the injectors usually stay in the rail when putting everything back together, I like the little added security of keeping the injectors in place while seating the fuel rail assembly, just my 2c

[This message has been edited by Ponnari (edited 04-20-2015).]

Just to update, I got it figured out.

I replaced all the seals and plastic pintle caps when i had the injectors out of the car during my swap. The problem was, I didn't use grease to slide the injectors in the fuel rail.. I forced them in with my hands (and I mean really force, it was difficult). I ended up cutting up the orings in this process which was causing my leaks.... Had to do them all over again with some grease. They slid right in, no effort at all, no leak too.

Thanks for all the info guys. Love all the great help on here.