Hi, my 84z originally came with the lg4. the computer was never hooked up and when i did it turned it out it was bad. Anyway, i bought a computer from an 84 ho and am now reading that this computer looks for a knock sensor. my harness doesnt have this included. i read that the car will run bad without the knock sensor. is this true? do i need to get an lg4 computer because of the lack of the knock sensor on my harness

 

I need to learn this stuff better myself.

What I know:
The knock sensor module is located on the firewall in the driver's side corner.

What I don't know:
How the knock sensor module and ECM talk to each other.

 

The ECM controls the timing advance.
The Knock sensor tells the ESC module when there is detination this happens when there is to much advance. Then the ESC retards the timing for 20 seconds. The Haynes manual explains it better then i can. If you could find out the electrical state of the knock sensor is at normal setting,(I.E Open. Closed, or a value in ohms) then you could simulate to the ECM and it would be happy. I hope this helps. I am new to the board and will try to help when i can.

 

i found this when i searched for knock sensor limp home.

Is this a TPI car or a CC Q-jet? I've disconnected it on my carbed setup and didn't recieve any codes and it didn't run different either. I've heard of wiring in a resistor inline to decrease the sensitivity, but couldn't tell you what value to use.

If this is a carbed car, from the 84 manual:

Loss of the ESC knock sensor signal of loss of ground at the ESC module would cause the signal to the ECM to remain high. This condition would cause the ECM to control EST as if no spark knocking were happening.

and here is the link to the topic https://www.thirdgen.org/techbb2/sho...nsor+limp+home