Quote:
Originally Posted by schmaz356
I have been doing some more research and while I don't know why there is no spark I may have made some progress on the fuel. Right now it seems as if DME Relay at terminal 85b is not going to ground as it should when the ignition is turned on. This is keeping the power from the battery through DME #30 from the battery from activating the fuel pump. Short of dismantling the DME box is there a way to check if the circuit connecting to pin 20 on the DME is working properly? Could I have some issue with the DME which is causing this issue and the no spark issue? I do have power however to the coil.
Any help is appreciated.
|
Here's briefly how the system works. With the key in the on position
power is supplied to the DME "main" relay. (i.e there are two relays inside the DME relay unit). The main relay provides 12V to the ECU and also to the injectors and coil. When You crank the motor the flywheel reference sensor
provides pulses to the ECU, the ECU sees the pulses and "comes alive" it then sends 12v (or ground, can't remember) to the second relay mounted in the DME relay unit. That second relay provides the power (or perhaps ground) to the fuel pump, and voila, the motor starts! I suspect you are having a problem with the flywheel sensor's signal not making it to the ECU. Just my best guess, but check your sensors. Years ago I had a 3.2 motor and had your very problem and fixed by adjusting the sensor gap. Or you could have a bad sensor.