Harness from Nelson due tomorrow

My swap (again) is from a 2002 F-body.
There is a vacuum line wrapped into the stock harness. It was not hooked to anything at either end.
Does anyone know where this is supposed to go? Tranny, does the 4L60E need any vacuum?

not unless you have a vac modulator on it. 4L60Es (stock) do not. FLT can build you a top notch trans with one for a price.

"Modulator"

I thought maybe that is what it was for. Not to savy on all this electronic stuff.
Checked a Motors manual at the Library, but I couldn't track it down. I will look at it again.
Just trying to figure out what it's for (where it goes)

Getting closer to turning the key. Still some things to pick up (damn thieves).

I believe that vac line goes to the duct controls. The line starts at the back of the intake manifold and I know if you remove it, the air ducts won't work.

You don't need it, I'm pretty sure of it.

You can just cap the rear of the intake manifold where it was hooked up.

good luck and let me know how it turns out.

thanks,
allen

The 4L60E trans, "E" standing for electronic. Has no vacuum driven componets.
So,,,,,,, the small tube (metal) that comes off the upper surface. It is about the same dia as a typical vacuum line. Is it just a vent tube?

The dash has vacuum operated components so the dash needs vacuum. It gets the vacuum from the fitting on the back of the intake manifold, next to the MAP sensor on LS1s. BTW, they make a vacuum modulator kit for the 4L60E to control the fluid pressure inside the trans. It's still shifted electronically but the fluid pressure would then be vacuum regulated. I believe that is what they were speaking of. :thumb:

Your talking the F-body dash, correct?

Allen stated we do not need vacuum (except obviously the power brake can) and his harness has deleted the plug for the vacuum sensor mounted on the top rear of the left bank (valve cover).

I am fine with all that. BUT, what is the metal tube comming out of the transmission housing, above where the cooling lines exit (about top dead center where the casting seam is) ???

And another question:::::::::::::::::::::

The harness has deleted another plug that would go into another gas line (the return line?). Its location is on the left front corner of the intake and a brass nipple that comes out the left side behind the throttle body.
If it is, do I just run it back into the return line into the tank? or cap it off?

This is not nearly as easy as working on my '66 vette. Will be nice when it is complete though.

Thanks,
Jon

The line on top of the transmission is a vent to bleed off air pressure that builds up as the fluids warm up. it goes nowhere. The sensor/module that hooks to the driver side of the throttle body is the fuel vapor recovery from the fuel tank. Most guys remove that totally from the system.

Thank you "Red"

Actually that is what I thought it was (a vent tube for pressure build up).

Vacuum -
***will cap all off, except the brake booster***

Fuel feed (lines)-

If I cap off the brass nipple and remove the sensor (Delphi 1997278)
It only leaves me (1) line (the feed line)

*** I am not finding the return line. Is there one? If so, where?

* If not, then I will get the Corvette filter and plumb it in.

I feel like I am 16 again (but feeling I know less now).

I have searched and read, searched and read and searched and read, so much I think
my eyes are bleeding.

All this just from laying Allen's harness next to the stock one. Wait 'til I start hooking it up.

Depending on what year vehicle, 97-98 Corvette had a return on the fuel rails, none of the other LS1s did. Return style Corvette fuel rail is needed unless you change to billet fuel rails with a regulator to return the excess pressure to the tank after the fuel passes through the rails.