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Old 05-09-2013, 09:39 PM   #1
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which wire should I tap into for my 3 wire o2 sensor

I have a 88 gta and was wondering which wire I should tap into for my 3 wire o2 sensor. it has to be a ignition switched 12 v wire

thanks
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Old 05-10-2013, 03:04 AM   #2
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Re: which wire should I tap into for my 3 wire o2 sensor

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Originally Posted by jamon8 View Post
wondering which wire I should tap into for my 3 wire o2 sensor. it has to be a ignition switched 12 v wire
The switched side of the OP switch ?
Hot as soon as engine makes 4psi oil pressure and dead when the engine off.
Other popular supply point is the switched side of the fuel pump relay
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Old 05-10-2013, 07:58 AM   #3
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Re: which wire should I tap into for my 3 wire o2 sensor

Radio power like everyone else....
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Old 05-10-2013, 08:54 PM   #4
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Re: which wire should I tap into for my 3 wire o2 sensor

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Radio power like everyone else....

what are you talking about radio power???
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Old 05-10-2013, 09:07 PM   #5
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Re: which wire should I tap into for my 3 wire o2 sensor

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the switched side of the fuel pump relay
Bingo!
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Old 05-10-2013, 10:02 PM   #6
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Re: which wire should I tap into for my 3 wire o2 sensor

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what are you talking about radio power???
lOl

-the power to the radio
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Old 05-11-2013, 01:59 AM   #7
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Re: which wire should I tap into for my 3 wire o2 sensor

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Originally Posted by patin88z View Post
Radio power like everyone else....


Straight from the "Bubba book of Auto wiring tips"
Why would you use a power supply inside the car that requires running a new wire through the firewall to the O2 sensor
when you already have one available low down on the engine block
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Old 05-11-2013, 09:59 AM   #8
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Re: which wire should I tap into for my 3 wire o2 sensor

which relay is the fuel pump relay and what wire should I tap into

its a 88 gta

thanks
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Old 05-11-2013, 10:09 AM   #9
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Re: which wire should I tap into for my 3 wire o2 sensor

Use the grey wire on your fp relay it next to the brake booster on the bulk head.
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Old 05-11-2013, 11:47 AM   #10
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Re: which wire should I tap into for my 3 wire o2 sensor

I don't want to get this wrong so could you tell me which relay is the fuel pump relay

here is a pic
Attached Images
File Type: jpg m_002.jpg (41.6 KB, 8 views)
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Old 05-11-2013, 08:00 PM   #11
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Re: which wire should I tap into for my 3 wire o2 sensor

Click the image to open in full size.
The relay has 4 wires, black, grey, orange, green with white stripe.

black = ground
orange = battery = 12v+ always
grey = wire out to fuel pump (on some cars this wire is tan with white stripe)
green/white = signal wire from ECM
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Old 05-11-2013, 08:00 PM
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