Potentially helpful pics of Upper Intake/Plenum area.

Potentially helpful pics of Upper Intake/Plenum area.

Postby gman [OP] » May 19th 2020, 5:00am

Hello all.
I just upgraded my van to MPFI. I used the service manual to do it (the part about upper intake removal and replacement), and a few videos to help with it.
I found that those materials were sufficient to do the job, so I felt like a write-up/"take pics as you go" was unnecessary.
But I did notice that it's kind of hard to tell the difference between what's exclusively a plenum bolt, and what is an accessory plenum bolt that holds down other accessories.
Technically, they are all plenum bolts (throttle body bolt also holds down the plenum), but some are exclusively made JUST for holding downt he plenum.
So I decided to take pics of those particular areas in order to help people who may be replacing their injectors or just doing something like taking off an ignition coil/throttle body.
(I'll post torque specs after I am back at my shop manual).


Anyways, here are the front two that hold down the throttle body. These bolts hold down BOTH the throttle body and the plenum (accessory plenum bolts).
To pop the T-body off, you'll need to also loosen the post that the wing nut is attached too.Sorry, a vacuum hose is hiding one of the bolts, but you can still see it's head.
101672

Here is Bank 1.
All of these bolts are exclusively used to hold down the plenum. One in front of the PCV/AC manifold vacuum line, one behind it, and one just hanging out near the cylinder 5 intake runner.
101666


Here is Bank 2.
All the way in the front (starting at cylinder 2), is the first bolt holding down the ignition coil, ICM, and throttle cable bracket. Not all vans use this bolt for the throttle cable bracket.
Mine does (99), and it's kind of an annoyance but it's not too bad. This is an acessory plenum bolt.
The one right behind it, is exclusively a plenum bolt.
The one right behind that one (the other raised surface with a round shape) is the other bolt holding the ignition coil and ICM.

The two behind that (nearer to cylinder 6 intake runner) hold down the EVAP purge solenoid. These are also accessory plenum bolts.
101668


Finally, here are the two rear bolts right in front of the distributor.
These are exclusively plenum bolts.
101670

Hope that helps anyone doing anything in that area.
1999 Chevy Astro Van
Original Poster [OP]
gman
Firing on 3 Cylinders (L1)
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Re: Potentially helpful pics of Upper Intake/Plenum area.

Postby sixsix » May 25th 2020, 1:52am

Nice writeup, gman - there's bound to be someone that benefits from your details.
I Thank You - in advance - as I wish it applied to our intake system.
We could revel in the success & learn mightily from your mistakes and hints.

Plus a few things that apply to generalized every day intake work.
.

"Ban gerrymandering" out 1 side, then says, "We really need to get rid of the electoral college for starters, there is no way in hell that the person that receives fewer votes wins, simply crazy."
So only CAL, ILL & NY Elects??
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