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about the wiring
alwaysworkinonit
+1y
Is the wiring in our trucks such that you can remove the ecu and the chassis electrical will still function and remain working? For example can swap engines, get a new ecu and just leave my turn signals, wipers, brake lights, etc. as they are? thanks.
dssur
+1y
if your truck is carbureted, the ecu controls the carb alone. The wiring can be removed by unplugging at the fusebox, engine, and ecu. You will need to have replaced the carb, or the whole engine as you were saying, first. Removing the ECU while still using the stock carb will give you a bad case of RLS.
bumlove_blue
+1y
i unplugged mine it is fuel injected. (took the motor out) all the lights still work wiper etc but I don't here the fuel pump relay click on any shed some light on that?
dssur
+1y
Originally posted by bumlove_blue
I don't here the fuel pump relay click on any shed some light on that?
The ECU turns on the fuel pump relay in the fuelie trucks. Even if you kludge the fuel pump though, the injectors will not open without pulses from the ECU. Without a standalone controller like a Haltech or MegaSquirt, you will not have any luck removing the factory ECU and wiring from a fuelie truck. It all has to stay.
Its still separate from all the other systems though.
I don't here the fuel pump relay click on any shed some light on that?
The ECU turns on the fuel pump relay in the fuelie trucks. Even if you kludge the fuel pump though, the injectors will not open without pulses from the ECU. Without a standalone controller like a Haltech or MegaSquirt, you will not have any luck removing the factory ECU and wiring from a fuelie truck. It all has to stay.
Its still separate from all the other systems though.
bumlove_blue
+1y
hmm so I am gonna have to find the wire outta the 4.3 harness to switch the fuel pump I guess
dssur
+1y
if your 4.3 is injected, yes you will. EFI is different than carbs in that the electric fuel pump is turned off by the ecu if you have the ignition on and dont start the truck.
Meaning, you could wire the factory relay to ignition, so the pump turns on when you turn on the ignition, but it will run run run run run as long as the key is on. Better to do as you are saying and use the FP wire from the 4.3 ECU and make it work as intended.
Do you still have your factory 2.2 FI engine? I am currently looking for an intake for one, just the lower part (the part that attaches to the head) but I'll buy the whole intake complete if I need to.
Meaning, you could wire the factory relay to ignition, so the pump turns on when you turn on the ignition, but it will run run run run run as long as the key is on. Better to do as you are saying and use the FP wire from the 4.3 ECU and make it work as intended.
Do you still have your factory 2.2 FI engine? I am currently looking for an intake for one, just the lower part (the part that attaches to the head) but I'll buy the whole intake complete if I need to.