top plenum/tpi

[Jim D]

Whats involved in removing the top plenum on my 87. I"m going to replace the injectors, thanks Jim.

[bossvette]

pretty straitforward, there are a couple of bolts hidden in the lower runners though relieve the pressure in the fuel lines before you start.

[bosshogg]

When I did mine I found out you can remove all of the upper bolts on the plenum then take the lower bolts out of the runner on the passenger side first. Bossvette is right...there is a bolt hidden at the front of the runner that comes in from the driver's side underneath the runner very near the front. On the driver's side runner the bolt coming in from the inside is towards the back of the runner...that is why you need to remove the passenger side first and the plenum then driver's side runner if you need to. Re-install in the reverse order and you should be fine.
GOOD LUCK...AND THINK SPRING
Boss Hogg

[mdsbch]

One other suggestion, lossen the gas cap. I took my fuel injectors out last week on my 85 coupe and I did all the steps releasing the fuel pressure at the rail and all. The next day I had a puddle of gas under the car because the temperature increased causing the gas in the tank to expand and force gas through the lines and out the fuel line that was disconnected in the front.

Mike

[Ghost~3~]

Originally Posted by Jim D

Whats involved in removing the top plenum on my 87. I"m going to replace the injectors, thanks Jim.

Just finishing up mine....As stated above pretty straight forward deal, You'll need
a Torx40 socket and extension to reach the above mentioned 2 "Hidden" bolt's
and it would be a GOOD idea to change that Thermostat while ya got that Plenum off!

I had a Bad EGR Valve, so that got changed along with all the other sensor's under or near that plenum as a preventative measure, I'd HATE to go back in there a month from NOW because the T-Stat went BAD when ya "COULD" have changed it NOW!!

I also changed the water Pump as my car hit the 70K mark and at 20 Year's old
I figured it had done it's duty!!

[speedmaster4]

on each side of the plenum/runner juncture, there is one ''end'' bolt that is ''angled'' and not perpendicular as all the others are...do not follow normal practice of starting all bolts before tightening any, leave those ''angled'' bolts on the bench until the ''straight guys'' are all tight, then install the ''angled'' ones.

if you are acquainted with the guy who will be next to remove the runners, visit the local sears hardware store and get socket (allen wrench) head bolts to replace the torx heads that hide under the runners at lower connection to the intake manifold.

[grumpyvette]

http://www.thirdgen.org/injectorswap

http://www.gmtips.com/3rd-degree/dox...-port/port.htm

http://www.bfranker.badz28.com/96ss/58porting.htm

http://www.gmtips.com/3rd-degree/dox...m/pol-plen.htm



youll find this of interest

[nelson84]

Originally Posted by Ghost~3~

Just finishing up mine....As stated above pretty straight forward deal, You'll need
a Torx40 socket and extension to reach the above mentioned 2 "Hidden" bolt's
and it would be a GOOD idea to change that Thermostat while ya got that Plenum off!

I had a Bad EGR Valve, so that got changed along with all the other sensor's under or near that plenum as a preventative measure, I'd HATE to go back in there a month from NOW because the T-Stat went BAD when ya "COULD" have changed it NOW!!

I also changed the water Pump as my car hit the 70K mark and at 20 Year's old
I figured it had done it's duty!!

How do you know you have a bad EGR Valve???

[Ghost~3~]

In my case the EGR was "STICKY" and it didn't matter if the engine was cold or up to running temp's, upon start up it would intermittantly stick closed, and the engine would start misfiring and I'd have to restart it about 6-8 times to get it
to "Free-up" and then the motor ran fine.

That would happen about every 8-10 times I started up the car, when it was
cold, not as often if it was up to running temp's. Rather "Irritating".

[DarkShark]

Originally Posted by Jim D

Whats involved in removing the top plenum on my 87. I"m going to replace the injectors, thanks Jim.

You'll need to pull the runners too.

[grumpyvette]

http://www.thirdgen.org/injectorswap

I think youll find this info helps

[Ghost~3~]

All back together....

"WHY" did I run the Plug Wires over the Valve cover's your Wondering??

Because I wasn't gonna have another set of $100 wire's "Baked to a Crisp" by the Exhaust by running them in the FACTORY location, so I went Old School.

[Ghost~3~]

"Shake Down" test Drive....It ran very Well!

[Blue89]

I am going to attemp to replace the injectors myself and am reading as many threads as possible to build confidence, since I haven't done this before but just one question........I read about relieving the fuel pressure and how to do that but then I read about disconnecting coolant hoses and lines and wonder if the radiator should be drained prior to starting the project. Any help here??

[DarkShark]

Originally Posted by Ghost~3~

All back together.... "WHY" did I run the Plug Wires over the Valve cover's your Wondering??....

Nothing wrong with running them over the valve covers... I did it too!



Glad to see you got it back on the road! I've had mine back on the street after a six month hiatus for almost three weeks now.

http://www.youtube.com/watch?v=5pgWe7mt5oY
http://www.youtube.com/watch?v=o3XzdUE8678