Quote:
Originally Posted by cruiserbrett
1227747 ecms also have a crank trigger signal that lets the ECM know that the engine is in crank mode and consequently changes the fuel tables. might be one of the wires to the starter for the gm harness.
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That is correct. There is a wire hooked to the switched wire leading to the solenoid. There is also an oil pressure switch that is threaded into the back of the block. The fuel pump relay will prime the pump and then shut off. The power to the fuel pump on a stock harness goes through that switch as a safely mechanism to stop fuel flow if the vehicle crashes and the motor dies. Obviously, it can also save your motor in the event of a loss of oil pressure. So make sure you have power to your pump. I assume you also know to disconnect the tan wire to the distributor before attempting to change the timing. If you don't, it will go nuts.
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A daily driver 1985 FJ60, 300HP TBI 350, NV4500, NP241, 14-bolt semi floater rear w/Elocker, 4.56 gears, SOA, four-wheel disk brakes, 35" BFGs, 360,000 happy miles and still going due to a wicked case of wander lust.
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