built not bought

hey i just bought another 1990 mustang gt 5.0 i bought it in no running condish and i got it running notice rough idle and check engine light comes on intermentenly and i looked at my injection harness and saw a orange wire cut but cant find the other end the wire is pointing towards fire wall plz help me

samseed101

Got a closeup pic of the wire? actualyl a closeup followed by an overall picture would help (to show what it looks like up close then to show it's location relative to the rest of the engine bay)

mjr46

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pics?? check all the injector plug ins and see if rodants have chewed on them

built not bought

well i dont have a pic of it yet but i kno injector wires are ok its a singe wire back at the main wire harness were it tees off

samseed101

Is it the main wire harness or the injector harness? On the computer side of the salt / pepper connectors or on the engine side of it? Is it 100% orange or does it have any stripes?

There are a ****load of wires in teh engine bay. It's going to be difficult to figure out what one wire is based on such a vague description.

mjr46

see if you can get a picture that'll be hard to guess right at without seeing directly

samseed101

Wait a sec... when you say it's right where it T's off? Like in the dead center of the back of the harness before it conencts to the salt / pepper connectors? That sounds like it may be your Oxygen Sensor ground. And if that was not connected, it could cause a CEL since the car wouldn'ty be able to run properly in closed loop (due to a lack of feedback from the HEGO sensors.)

Are you sure it's cut and not just disconnected? If it's what I think it is, it wouldn't be connected to any other point in the harness. It would come out of that harness and be grounded. Look for some other aprt nearby that it would be grounded to or just try to reground it yourself and see how it runs then.

Does it run okay for 30 seconds or so when you first start it up and then run crappy? (when it tries to go from open loop to closed loop?)

built not bought

its a full orange wire the car idles like **** and stalls sumtimes and check engine light comes on like after 15 min of driving and i cant find the other side of the wire

samseed101

Like I said, ground it somewhere and try again. But before you do that, clear the memory by disconnecting the negative battery terminal for 5 - 10 minutes.

ZachW04Stang

The other side of the wires should be on the back of the drivers cylinder head. If you can't find it then just put a crimp connector on the end of the wire with the o end and bolt it to the back of the motor.

02 sensors normally won't cause the car to stall but when they aren't working properly it may be possible.