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Courtesy of Danny88SS again:
CONSTANT FUEL PUMP RUNNING - I personally think this is a JIM WOLF oversight
somehow, on their Computer upgrade. I do know that one of the mods to the
computer is to beef up the circuitry in the Computer so that when you add a
bigger in-tank fuel pump, you don't over load the trace that the added
amperage adds. This in turn causes this "constant pump run". I spent hours
talking to Jim himself on a fix for this, here is what I came up that
finally worked. I forget why, but for some reason, the air regulator on the
intake has something to do with it. The fix is this. There are two wires
going to the air regulator, one is ground, and the other goes back to the
ECU. I am not sure which is which, but the ground, goes back to the ECU
also, and is grounded thru the main ECU ground. What you have to do, is
take that ground, and separate it from the ECU ground. There is a bolt that
is near the air regulator, just in front of it. This is where I grounded
the air regulator. I just stripped the wire back, and twisted it around the
bolt, and that supplies the ground. Kinda fishy if you ask me, but this is
the only way I found that would fix this, Jim stated this is what needs to
be done, but I think they should incorporate something different on their
ECU upgrade. By the way, if you don't have a factory Nissan service manual,
get one. It is invaluable in situations like these, finding grounds, ECU
pin-out, and such. Again, Good Luck !
