Hello everyone,

I am restoring a 89 formula 305 TBI WS6. I just purchased the hardware for a 84 trans am to make the power bulge hood functional. I have all the pieces, but I cant figure out how to make the solenoid work to bring in the cold air? There is a wire with a plug that is coming off of the solenoid. Is the soleniod throttle controled?

Thanks for the help! I learn something every day reading these boards!

 

I just checked my wiring diagrams. The function was controled by the ECM and was only available on the LU5 engines.

I can-not find any connection deteils for any of the carb engines from 1982 - 1984.

I had a feeling that the stuff you got came from either a 1982 or 1983 Trans Am.

I

 

Thanks,

Yea, I am sure it came from a 82 to 84 TA, I'm hopeful I can make it work on my 89 formy with TBI.

 

Bruce, the reason you cannot find any connections for carbed engines is that was only functionally available on LU5 engines, which were CFI. I wish I could help out because I have an '82 LU5, but the previous owner converted it to a carb and pulled the door and solonoid off so the power bulge is always open, which may be an idea for you, dhenderson. My only question is, if you are restoring an '89, did you switch out the hood for an '82-'84 or did you buy the car with that hood on it already? In '85 they switched the hood design to a "louvered" one, removing the power bulge.

 

My 89 already had the power bugle hood, picked up the induction hardware on ebay, just trying to make the hood scoop work with my tbi.

thanks for the help!

 

Not that Ive ever had a really in depth look at a TBI car, but isnt the intake routed more toward the front of the car? As far as the actual induction force the cowl produces, I question that as well. Mine seems to let air flow out of it more than into it. Of course my fan is constantly spinning anyway, but I would think it would take a great deal of speed for the forces of physics to actually pull air into the cowl seeing as its so far away from the windsheild. Anyway, you may also want to look into the control switches that opened the cowl induction on late 2nd gen Z28s as well (79?,80?,81? I believe it was 80 though). These operated by some sort switch located on the gas pedal and opened via a vacuum line instead of electrically. This may work better than the 82-84 setup that you are trying.

 

Hey everybody,

I still need some info on how to make this scoop functional.

Thanks,

 

henderson

just use a factory 84 trans am h.o carbed vacuum switch to activate the solenoid, easy to wire up just run a ignition feed to the solenoid, and a ground from the body to the the vacuum switch, then a ground from the vacuum switch to the solenoid, when engine vacuum reaches zero vacuum switch grounds and the flapper door opens simple as that.

crossfires were ecm operated and the carbed cars used a vacuum switch

 

You could use a WOT switch as many nitrous systems use, or a switch you hit inside the car to open / close it... or both...

 

Just thought i'd share this, as it's somewhat on topic:
http://www.hioutput.com/tech/air2.html

 

I scanned some pics from my '82 Shop manual. Hope this might help you out. I know your car isn't stock but it might give you an Idea. The ECU controls when the louver door opens. I could not find in the manual what conditions has to be met to have the ECU open the flap. By looking at the diagrams and the wiring I believe that at WOT the ECU triggers a WOT relay/switch which then sends a signal to the louver solenoid to open the flap. The Wiring coming from the Louver solenoid connects to the WOT Relay which I believe is the relay in the diagram that is next to the manifold pressure sensor. Not sure what location under the hood if stock. Also in the diagram it shows the wiring coming from the louver solenoid as the C.L.C.C. harness. Not sure what means since the manual doesn't say, but it does show a harness near the battery called the same (C.L.C.C.) which suposedly resets the ECU by unplugging it. Not sure if it's related. However in the wiring diagram it shows a connector coming off the WOT relay that looks similar to the Louver solenoid connector. Maybe with this info you can get something to work out on your car.

 

Here is the Louver and relay diagram.

 

Here is the Louver solenoid troubleshooting chart. The solenoid uses a signal from pin 7 from the ECU.

 

Here is the wiring diagram. It's kinda hard to see, but the WOT and Louver Solenoid connector is at the bottom. This is circuit 820 on the previous diagram.

 

Hi

Just to clarify 82 carb cars did not have a funtional buldge. And if your putting one on a tbi car youl need the LG4 setup from 83-84 not the LU5 as the opening on the airbox needs to be round.

But you have everything so that does not matter..

There should be 2 wires off of the airbox.. one will ground to the hood the other needs to plug to your vac switch you will mount by your vac sensor. The vac switch will have to plug in to key controlled 12v power. from there youll have to tee vac off of the vac line going from the rear of the intake manifold to the black vac box on the firewall..

Thats all. I just put a functional setup on my 82 off of a 83 and I love it.. Why have that awsome hood but not have it do anything?

I dont know how much this pic will help on your car or if my directions will work on a tbi.. If you get us some pics im sure we could help further..

Good Luck
-Michael

 

Pic of different years/models

 

Thanks Everyone,

Daniel