Quote:
Originally Posted by SentraSE-R
FWIW, I believe Brucepick's explanation of the fuel injector relay in message 9 of this thread is incorrect.
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So you are saying that his description of how the switched and powered side of the relay works is incorrect. But I don't think it changes the general import of the message, does it? He wrote:
Quote:
Originally Posted by brucepick
By temporarily severing the ground wire you disable the relay's internal switch, and it sends out no current from the switched side....
This modification just adds one more place from where the relay's status can be controlled. I can't tell from here whether the computer switches the power to the relay's control side on and off, or whether it severs the control side's ground, basically like this mod does. Either way would disable the small coil, which ultimately means no power going out to the injectors.
The injectors themselves receive constant power as supplied via this relay. They are controlled on their ground side. Each injector has its own ground wire going to the computer. The individual grounds are completed by the computer for small fractions of a second at a time. Each injector will squirt fuel only when its individual ground path is completed by the computer.
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I have been wondering if there is any possibility of squirted and unburnt or partially burnt fuel in this scenario. Would show-up as fouled plugs, but would also mean piston damage over time. That's why this update. I want the injectors shutting off more cleanly, and that seems to work best when the revs are dropping, not arcing-up from a 75% load pulse at the moment of cut-off.