mystery wires ??
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Freshman User
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mystery wires ??
i have found 3 wires on my truck and i have no idea where they go to. they are coming from behind the engine by, the i guess egr in same wiring harness then over the fender well to the solenoid area. there is a plug connection there and as it comes out of the connection they are cut, and i have no idea what they go to. there is a green with purple stripe, gray with yellow stripe and a black, the gray with yellow has voltage on it, almost 14 volts when the engine is running.
any one know what these wires go to. i have looked high and low and i can find nothing that is missing a few wires. but i know something is missing or they wouldn't be there.
any one know what these wires go to. i have looked high and low and i can find nothing that is missing a few wires. but i know something is missing or they wouldn't be there.
Fleet Owner
Joined: Aug 2005
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From: Easton,Ks
These wires go to the "Heated Exhaust Gas Oxygen Sensor (HEGO)".
Black is ground.
Gray with Yellow stripe is power.
Dark Green with a purple stripe goes to pin #29 of the EEC Computer.
Black is ground.
Gray with Yellow stripe is power.
Dark Green with a purple stripe goes to pin #29 of the EEC Computer.
Last edited by subford; Nov 5, 2007 at 07:01 PM.
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Freshman User
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OK thanks subford, i have looked till i have no other place to look where is it or what should it be attached to. the wires looked cut and i cant find no place where they should go, maybe its been taken off by someone that needed it more than this truck did.
Posting Guru
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From: Florida
If I'm not mistaken the HEGO is also the O2 sensor....your truck doesn't show a check engine light does it?And it doesn't run like crap either right?It should have a spot on the passenger side exhaust pipe as it comes into the wye (2 into 1 pipes) or there should be at the very least a bung...If there isn't.....you could either put an O2 sensor in or not.....it's up to you....
JR
JR
Fleet Owner
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From: Easton,Ks
Yes it is the O2 sensor and it should be screwed into the exhaust header pipe on the passenger side.
"This sensor measures the oxygen content in the exhaust gas. This sensor is for feedback, it tells the computer when the air to fuel ratio is above or below 14.7:1. Sometimes the computer is attempting this mixture and sometimes it ignores the HEGO. For more, please seek further reading on the web or in books."
The above quote and image below is from fordfuelinjection.com.
For more information click on this URL.
http://fordfuelinjection.com/index.php?p=31
"This sensor measures the oxygen content in the exhaust gas. This sensor is for feedback, it tells the computer when the air to fuel ratio is above or below 14.7:1. Sometimes the computer is attempting this mixture and sometimes it ignores the HEGO. For more, please seek further reading on the web or in books."
The above quote and image below is from fordfuelinjection.com.
For more information click on this URL.
http://fordfuelinjection.com/index.php?p=31
Last edited by subford; Nov 6, 2007 at 06:26 AM.
Junior User
Joined: Sep 2006
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hmmm my truck i kid you not has sooo many wire that i have no idea what they should do since they arent connected especially under the dash....i couldnt even describe them being so many... lol i'll probably have to take a pic and show ya :-p but good luck with urs
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ok the engine light is not on and its running fine right now but these wires are there so im guessing the other owner cut it out for what ever reason. if it was you guys would you hook it back up or leave it as it is, since its running fine or would it be better to fix it back?
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From: Sand Lake, MI
Originally Posted by js2743
ok the engine light is not on and its running fine right now but these wires are there so im guessing the other owner cut it out for what ever reason. if it was you guys would you hook it back up or leave it as it is, since its running fine or would it be better to fix it back?
Lead Driver
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From: Sand Lake, MI
If it works you may never notice any difference, but the computer should.
You may need to replace that 02 sensor if it has been in the exhaust stream for a long time with no power to it. May be all carboned up and unable to do its job, may be able to just clean it up.
You can test it if you want with a multimeter so you know for sure.
You may need to replace that 02 sensor if it has been in the exhaust stream for a long time with no power to it. May be all carboned up and unable to do its job, may be able to just clean it up.
You can test it if you want with a multimeter so you know for sure.
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