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View Full Version : some wire grouning causing my inj. to stay open.


1992MustangDW
10-22-2008, 08:06 PM
anyone ever heard of this, or know whats going on?
mustangjon
10-22-2008, 08:15 PM
all the injectors are staying open??? and no but honestly im fairly fresh to the fuel injection builds myself.
quik lx
10-22-2008, 08:37 PM
If its all the injectors it would have to be eight different wires...or a bad computer. I have seen one injector affected like this before.
Paul408Notch
10-22-2008, 10:40 PM
If its all the injectors it would have to be eight different wires...or a bad computer. I have seen one injector affected like this before.

What he said.

Injectors have a constant positive signal (Pretty sure it's 12V, but it could be 5V, I can't remember.) The computer closes the circuit by making and breaking a ground every time the injector needs to fire. Somehow I doubt all 8 wires ended up with a constant ground, but I've been surprised by stuff like this before.
1992MustangDW
10-22-2008, 10:52 PM
I talked to andy law and he said I most likely pinched a wire and caused it to ground on the motor causing it to stick open, I have another computer I could try.
facemelter71
10-23-2008, 10:11 AM
I doubt its the computer.How many injectors are stayin open? All of them or just 1? Did you recently do something that involded the injectors or harness?
1992MustangDW
10-23-2008, 10:24 AM
well I put the whole car together :(


bought the car in about 300 peices...

all of them except two i think.
quik lx
10-23-2008, 11:44 AM
You either have a crushed wiring harness or a bad computer. period.


Put a meter on the pins in the computer connector for the injectors and touch it to a good ground, if you have contunuity the wires are bad. If you dont the computer is.
slvr87cpe
10-23-2008, 12:30 PM
joe aint this what maggies car was doing ??
1992MustangDW
10-23-2008, 12:43 PM
fixed the problem I must be a jack ass I had the orange wire off of the inj. harness grounded to the body, as soon as I grounded it to the motor it stopped and fired right up..

But still isnt burning all the fuel. blackish smoke coming from tailpipes.
quik lx
10-23-2008, 02:43 PM
joe aint this what maggies car was doing ??

yes, but it was only one cylinder. How's your ride?
1992MustangDW
10-23-2008, 02:47 PM
ok everything is great now, who would have figured that the map sensor would need to be plugged in.