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Thread: COP's conversion problem

  1. #1
    Forum Member 1st year Apprentice
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    Default COP's conversion problem

    Hello!

    I have run into some problems i dont know how handle!

    So i have started a conversion to coil on plug for my 7AFE engine. Im folloing a guide : https://www.club4ag.com/forums/viewtopic.php?t=206 for conversion on a 4age 20v.
    Since it the same kind of ignition system i tought it would work?
    I have now wired up by just tapping the IGT signal wire so the igniter and coil is still inte the distributer and i can run by either the orignal leads. So i manage to use 2 coils and 2 orignal lead and engine runs great.


    So i have wiring everything up and get two of the coils to fire. the weird part is that i can only get two to fire, dosent matter which of the 4 plugs i use. But as soon as i connect three COP's they all stop firing...

    Anyone know why this could be? it dosent depend on which plug i use or coil, have rotated them all around and they show the same symptom.
    Also put all +12 wires straight to battery so its not for lack of power.
    It seems to be the IGT signal?

    Also a sidenote.

    Would i be able to run without the original coil and ignitier and just produce the IGF signal needed to the ecu by the IGF signal from coil?

    //Cheers, help me before i go crazy
    Thanks

  2. #2
    Forum Member 1st year Apprentice
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    Default Re: COP's conversion problem

    I think the signal from the ECU is possibly been pulled down too much from the extra coils. If you can get your hands on an oscilloscope you will see if that is the problem.
    If there is a 5-volt signal coming out of the ECU to the igniter, you can easily use an Arduino to boost the signal, just give every coil its own output pin on the Arduino.
    If you read the fine print in the link above, it said that they used the original igniter and coil so the tach would work, maybe that would be a good place to start, disconnect the original igniter, and see if that helps by reducing the load on the ECU signal. If you need the tach the Arduino could supply the signal for it. (I've used Arduino to drive a speedo before a tach is basically the same thing)

  3. #3
    Forum Member 1st year Apprentice
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    Default Re: COP's conversion problem

    Hmm might be the reason yes, sadly im away from school on my master thesis so cant get my hand on a oscilloscope But might be able to prove with arduino since it 5v.

    Yeah im afraid of the delay a arduino base circuite could impose for the signal, that why im on the other threadused mosfets to transfer the IGT signal. But might be worth a tryout anyway!

    Just so confused that the signal only go to two of them, that kind of electro i cant get my head around

    oh yeah? just feels weird that i cant find anyone doing it with the IGF signal, usally a warning signe haha. Yeah im longing to get my arduino code to work properly!

  4. #4
    Forum Member 1st year Apprentice
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    Default Re: COP's conversion problem

    You can give this code a try, it works on the bench with LEDs not tried it with coils and an engine, The only problem is you might have is interference from electrical noise, the speedo that I did sometimes would flick to a higher speed for a moment under certain conditions (wipers on foot on the brake and indicators all at the same time).
    The Arduino is very fast you won't have problems with delay.

    // constants won't change. They're used here to set pin numbers:
    const int buttonPin = 8; // the number of the pushbutton pin
    const int ledPin = 13; // the number of the LED pin
    const int ledPin1 = 12;
    const int ledPin2 = 11;
    const int ledPin3 = 10;

    // variables will change:
    int buttonState = 0; // variable for reading the pushbutton status

    void setup() {
    // initialize the LED pin as an output:
    pinMode(ledPin, OUTPUT);
    pinMode(ledPin1, OUTPUT);
    pinMode(ledPin2, OUTPUT);
    pinMode(ledPin3, OUTPUT);
    pinMode(buttonPin, INPUT); // initialize the pushbutton pin as an input:
    }

    void loop() {
    // read the state of the pushbutton value:
    buttonState = digitalRead(buttonPin);

    // check if the pushbutton is pressed. If it is, the buttonState is HIGH:
    if (buttonState == HIGH) {
    // turn LED on:
    digitalWrite(ledPin, HIGH);
    digitalWrite(ledPin1, HIGH);
    digitalWrite(ledPin2, HIGH);
    digitalWrite(ledPin3, HIGH);
    } else {
    // turn LED off:
    digitalWrite(ledPin, LOW);
    digitalWrite(ledPin1, LOW);
    digitalWrite(ledPin2, LOW);
    digitalWrite(ledPin3, LOW);
    }
    }

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