Quote:
Originally Posted by shiftdrift944
so if im ever so off on the gap could this cause it to not run and run sometimes?
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Anything is possible. Having said that, I doubt it. The signal is weak anyway but from a new install I'd expect it to work or not. Not be intermittent. It would take some time for crud to build up on the sensor to block the signal if the gap was too large.
Here's how the DME relay works (there's two relays inside the package);
When you turn your key to ON, the first relay is energised. I stays energised in the START position. This relay provides 12V to the DME. When the key is in the START position, 12V is also provided to the DME on Pin4. Through circuitry in the DME, this 12V causes a GND out on Pin20 that energises the second relay and turns on the fuel pump. After the car has started, the speed sensor sends its signal to the DME and again through the DME circuitry also produces the GND signal from Pin20 (Pin4 no longer has 12V because the ignition switch is now in the ON position). This keeps the fuel pump running.
Thus, if you lose the speed sensor signal in any way, the fuel pump turns off and the car stops.
Hardwire jumpering of the DME relay hides any intermittent faults within the DME. It is not a conclusive test that the DME relay is faulty. What it will do is confirm that your sensors are okay or not.
So, you have two choices. The relay is intermittent or the DME is intermittent.
Cheers,