87basemodel

so far ive changed both coil/igniters and still no spark when i put my voltmeter on the leading green/yellow wire as i turn it over i get nothing. i know its not the timing chain cause the crank is turning in the cas is my ecu bad and if so where is it????????

Icemark

The ECU is located under the passngers foot board (where the fire wall meets the floor).

How did you check the grn/yel??? the signal will have ground switched on and off very rapidly (typically almost an AC cycle).

87basemodel

yes i did check the green/yellow and there is nothing there.....

Icemark

Again how did you check it???

You would need to set your digital multi meter to AC, put the positive lead of the meter on a 12V source and the neg lead of your meter on the wire while someone cranks the car to see any signal.

87basemodel

i did that and still nothing so i pulled the ecu and took it apart i have a tendancy to do this neways as soon as i pulled the carpet i smelt burnt electronics found a diode was bad so i rigged a new diode in there and now im finding 2.5 volts on the trigger wire AC... but still no spark is this because it needs 5 volts?

Icemark

No, on AC volts you will read half the voltage. If it was not triggering you would not have any AC voltage.

87basemodel

so i am getting a trigger but still no spark also if i plugged in a standard spark plug would i see a spark plus everything on the coil tests out?????

Icemark

If the extra plug body was grounded, yes you would see a spark if you just put a spark plug at the engine end of the spark plug cable.

If your cables are bad you may not though

87basemodel

i ohmed my cables and got like 17000 ohms is this right?? i also noticed before i fixed the ecu i got 12 volts on the black yellow wire on the leading coil but now i get nothing??

Icemark

Well the cables should have less than 16K ohm resistance per 3.25 feet