1987 Shelby Charger Stage 2 Logic

[Hillbilly1987]

I'm recently sent my computer to get recalibrated. I accidentally got a 1987 stage 2. And the 87 shelby uses an 86 logic.
No biggie. I'm fairly good on electrical systems. I added a few pins to the logic mod plug ins and moved a few wires so it would work with my 86 electrical system. I used the map sensor plug off of a stock burned up computer to pin in.
It works. And runs clean. Not running rich or lean (by my mixture gauge).
But the car idles at 2000. I am not sure why. The only thing that I can think of is that I am using the map sensor that is inside the cab.
What is the difference in the one in the cab and one under the hood. Would that be the problem? Any ideas what would cause this problem?

[GLHNSLHT2]

87 T1 or 87 T2 logic mod? It might not like the T1 AIS?

[Hillbilly1987]

It's a 87 turbo 1 logic.

[Hillbilly1987]

It is ais but i don't know what that is.

[JT84]

AIS = Automatic Idle Speed motor, your current one is a two wire and the new LM needs the four wire kind found on the 87 and up throttlebodys. The only way I know how get one to work is by changing to the 87 up one piece or two piece intake manifold. For now you might have to mess with the idle adjustment screw.

[Hillbilly1987]

Yea I done a lil reading on ais before I checked back. I still didn't know that 87 had a 4 wire. I can't find any extra AIS pins on 87 computer. So I don't know how to correct it besides with an 87 ais. All the air is sucking through the small hole on top of the tb.

[JT84]

Until you can convert your car to T2 status (if that is something you want to do) you will need to adjust the idle manually and keep the current AIS unhooked. Or go back to your old computer.

[Hillbilly1987]

I only see one plug on the tab and it doesn't seem to change any thing with it unplugged.

[JT84]

Are you talking about the plug that the current AIS goes into? If so then unplugging it won't do anything with the idle speed it will just stop the computer from sending the AIS the wrong signal so it doesn't burn it up. ( not even sure if it will but better safe than sorry) and the TPS runs through that connector as well so you don't want to unplug it but rather remove the two AIS wires from it.

[JT84]

On the throttle body behind the black cap as seen in the picture is the idle screw that needs to be adjusted to bring the idle down.

[detobias]

back to OP-

I doubt the problem is tha cab-mounted MAP;

high idle means excess air is coming in somewhere...
usually either a vacuum leak or an AIS issue

first check all vacuum lines and tees;
replace any/all that are suspect;
make sure all caps are present (no open vacuum taps)

then I'd remove throttle body, remove AIS, clean all thoroughly..

Quote:

Originally Posted by JT84 Until you can convert your car to T2 status (if that is something you want to do) you will need to adjust the idle manually and keep the current AIS unhooked. Or go back to your old computer.

none of these choices really helps the issue

OP is trying to convert 86 style *TI* wiring to 87 style *TI* wiring ..
to accommodate the 87 LM he has (no longer has his 86 LM)

[Hillbilly1987]

From what I am understanding, I'm going to need a 4 wire ais? I still have the 2 wire and lots and lots of air is coming through the small hole on top of the tb

[JT84]

Quote:

Originally Posted by detobias back to OP- I doubt the problem is tha cab-mounted MAP; high idle means excess air is coming in somewhere... usually either a vacuum leak or an AIS issue first check all vacuum lines and tees; replace any/all that are suspect; make sure all caps are present (no open vacuum taps) then I'd remove throttle body, remove AIS, clean all thoroughly.. none of these choices really helps the issue OP is trying to convert 86 style *TI* wiring to 87 style *TI* wiring .. to accommodate the 87 LM he has (no longer has his 86 LM)

The problem is that an 87 LM is trying to control an 86 AIS which will not happen. Adjusting the idle screw is just a bandaid to get the idle down until he can convert it to T2 status.

[detobias]

87 & 86 TI are both 2-wire AIS, with the same pins on the LM ..

The 1987 T1 Logic Module - MiniMopar Resources
1986 Turbo I Logic Module - MiniMopar Resources

Quote:

Originally Posted by JT84 The problem is that an 87 LM is trying to control an 86 AIS which will not happen.

please explain why ?

[Hillbilly1987]

That is the same thing I found. I didn't even have to repin the ais.