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Hey I'm trying to put a o2 sensor in but the wire is too short. It's on a 4.9 1990 350. I got the botch 15718 which I believe is the longest wire. Should I just cut wires and add some in or is there a better way?
Where is the O2 sensor bung on the exhaust? How much too short is it?. Where does the chassis side of the O2 wiring come down on your truck? On my '90 F150 it came down behind the battery and was loomed in with the starter wires, after cutting off the tape on this loom I was able to pull out maybe 12" of extra length... can't remember now that was a long time ago. It was enough to reach the collector of longtubes which is quite a bit further back than the factory Y pipe location. On some trucks the O2 wiring comes down over the top of the transmission but the same thing may apply so have a look before cutting and splicing wires, That will work if done correctly but just introduces a point of failure if not done well.
The o2 sensor plug is behind the battery and the o2 sensor location is down by the starter. I measured about 30 inches or so between them. I'll definatly check and see if there is some extra wire in there if not the o2 extension might be easier than adding some extra unnecessary cuts. Thanks for the help
Sounds like the factory extension from the battery to the starter location is missing or the wires have been cut off so short that you can't see them. There should be a factory conector down there.
On my '88 5.0, the O2 sensor wires exited the harness at the green dot in the picture.
I think originally, they ran around the passenger's side, inner fender to behind the battery but a previous owner had rearranged them.
The extension was in the glove box and the O2 sensor leads were connected to the ECM power grounds near the battery.
I think you need the extension to get the correct combination of male and female connectors, but as has been stated above, you could pull it back from the battery and splice it. My hand is on the O2 sensor wires. There's a vacuum line parallel to it in the picture but it's in the background.
On mine, the extension has female connectors on both ends.
The wire that was originally behind the battery has a male connector and the O2 sensor has a male connector.
I needed the extension to make it work.
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