Thread: Intalling injectors soon. Any tips?

Will be installing some 60# injectors within the next week or two for my E85 swap.

Anyone done this that has any pointers? And specific instructions I should follow?

Looks as simple as removing the 4 10mm bolts for the fuel rails and popping the whole unit out. Should I lubricate the new injector o-rings with anything before installing?

Thanks!

Plenty of lube



Simple.. Let the car run and pull the fuse for the fuel pump so it'll leave very little fuel at the rails that way fuel won't be spraying everywhere when you pop the rails off. Should just be 4 10mm nuts holding them. Then take a tad bit of either oil or petroleum jelly and apply on the orings that way they will slide in easier. Won't you get the rails back on I like to tap the rails in several different places with a rubber mallet to make sure the injectors are seated in properly.

Good deal, thanks guys. as far as removing the rails go, I can just leave them connected to the supply/return lines running to the tank right? Want to disconnect as little as necessary.

Also, when I pull the rails off after removing the 4 nuts, can I just leave the stock injectors connected to the rails? or better to pop the rails off the injectors first?

Yea you don't have to remove the fuel lines and yes forgot to mention discount the injector plugs for each one or you won't have enough slack to pull the rails up

Originally Posted by REDCOMPG

Yea you don't have to remove the fuel lines and yes forgot to mention discount the injector plugs for each one or you won't have enough slack to pull the rails up

Got it. Thx again. Sounds like this can be done pretty easily. May even try it one evening after work this week.

Just pop the rails off w/injectors...try and clean with some brake cleaner around the injectors before removal though. Remember no force should be needed when doing this. Gentle twist and turn will get them in just right.

Originally Posted by 91parkave

Just pop the rails off w/injectors...try and clean with some brake cleaner around the injectors before removal though. Remember no force should be needed when doing this. Gentle twist and turn will get them in just right.

Good deal. As a side note, I know you have been involved in the E85 threads. I have already built a base tune for my E85 setup with the 60# injectors. Wondering if you changed your injector tables to support E85? or if you just change your AFR targets for stoich. as well as in PE mode? or did you change injector tables as well as AFR target tables?

It should really take like 30 min if you take your time.

Originally Posted by 97AutoXVette

Good deal. As a side note, I know you have been involved in the E85 threads. I have already built a base tune for my E85 setup with the 60# injectors. Wondering if you changed your injector tables to support E85? or if you just change your AFR targets for stoich. as well as in PE mode? or did you change injector tables as well as AFR target tables?

I'm in a deffrent category being that I'm on a LS based pcm ...all I do is change my master stoich table. Everything fuel related works off that table. No injector skewing necessary at all. You guys have a master stoich table as well but people aren't sure if it works or not since everything is displayed as Afr values for your PCM.

Pe mode worked out where I had it. Since your forced induction you will need more fuel and that all depends on what works best for you. Keep an eye on your wideband and adjust accordingly

Before you go to pull the injectors.. Spray a dab of pb blaster etc at each o-ring. Turn the injectors before pulling the rail. These two items will help free them up if the rings are old and stuck. Pull the clips off the rail at the injector as well. Put the clips back on before the new injectors. The new injectors will snap in and hold.

Personally, I like to remove the fuel lines from the rail (takes special tool) because the plastic lines can be brittle and man handling them can crimp or cause pinholes.

Lube the o-rings with vasoline (sure it sounds funny, it's cheap and usually common).

Originally Posted by BillBoost37

Before you go to pull the injectors.. Spray a dab of pb blaster etc at each o-ring. Turn the injectors before pulling the rail. These two items will help free them up if the rings are old and stuck. Pull the clips off the rail at the injector as well. Put the clips back on before the new injectors. The new injectors will snap in and hold.

Personally, I like to remove the fuel lines from the rail (takes special tool) because the plastic lines can be brittle and man handling them can crimp or cause pinholes.

Lube the o-rings with vasoline (sure it sounds funny, it's cheap and usually common).

I am familiar with the fuel line removal tool, but not sure where to pick one up? (made a cheap version once and it worked but don't want to go that route again).

thanks for the pointers on the injector removal. Will be sure to use them.

Originally Posted by 97AutoXVette

I am familiar with the fuel line removal tool, but not sure where to pick one up? (made a cheap version once and it worked but don't want to go that route again).

thanks for the pointers on the injector removal. Will be sure to use them.

Harbor Freight has em about 1/2 the cost from a car parts store... They're cheap though ($15) for the set.

http://t.harborfreight.com/catalogse...lt?q=Fuel+line

Or just buy the yellow one for like $6 at the parts store

Originally Posted by darkhorizon

Tune change just needs to be in the injector constant. Change it to roughly 42# and put some miles on it. Make 1 adjustment after getting a good idea how far off percent wise it is at cruising speeds. I usually rely on medium loads and higher than normal rpm to collect the most accurate data from the o2 sensors.

I do have a tune prepped with the injector tables modified. I am still curious why I shouldn't change the stoich. Table though? I would think I could just change stoich and PE table and be done. Is it true that the stoich tables don't work well in the 3800 PCMs?

you could try for yourself, switching the stoich with the injecotr table that was meant for that injector. Start her up, scan and see whats going on, If your fueling is still good and you have a wideband thats reading stoich still, then youre golden.