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#1068270 - 10/15/20 12:33 AM Power for heated o2 sensor  
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88ssBrent Online content
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88ssBrent  Online Content
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Have the headers installed still have to run the rest of my exhaust. Im pretty happy with the fitment of the patriot 8096. Not the greatest picture.
[Linked Image]

My question is where did you pull power from for the heated o2? Also going to put a wide band and speedhut a/f ratio gauge in the other exhaust so im trying to think ahead. What kind of amps does the heating element pull in a 3 wire o2?



Last edited by 88ssBrent; 10/15/20 12:55 AM.
#1068271 - 10/15/20 01:18 AM Re: Power for heated o2 sensor [Re: 88ssBrent]  
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Buick Runner Offline
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Buick Runner  Offline
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Dharma station 1 the Hydra
I just tapped mine into the electric choke power circuit.


SBC powered 1987 Regal with TES headers, ZZ4 intake, ZZ4 PROM chip, mini starter, THM2004R, 2500 stall converter, 2040 cam, CCC system, and 3.73 posi rear.

2008 ex NPS P71 Crown Victoria, cop motor, cop shocks, cop brakes, and Jmod.

Never argue with an idiot.
They will just drag you down to their level and beat you with experience.
#1068274 - 10/15/20 01:31 AM Re: Power for heated o2 sensor [Re: Buick Runner]  
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88ssBrent Online content
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88ssBrent  Online Content
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Originally Posted by Buick Runner
I just tapped mine into the electric choke power circuit.

Thank you! I have a tendency to make things more difficult that they should be. I didn't even think about the electric choke power circuit.

#1068275 - 10/15/20 03:15 AM Re: Power for heated o2 sensor [Re: Buick Runner]  
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Fred SS Offline
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Fred SS  Offline
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Glassboro, NJ

Originally Posted by Buick Runner
I just tapped mine into the electric choke power circuit.


That is what I did also. Has been working good for several years now.


87 SS, Harwood cowl induction hood, UMI trailing arms. Edelbrock TES Headers (Jet Hot Coated). Goodwrench 350, Ported TPI, Trick Flow 56cc alum heads, SLP runners, Comp Cams 260AH-12 cam, Trick Flow 1.5 roller rockers, Bilsteins, TCI 2400 stall converter, Ramcharger fans, Denny's 3.5" Driveshaft, GBodyParts GNX Wheels.
#1068278 - 10/15/20 12:45 PM Re: Power for heated o2 sensor [Re: 88ssBrent]  
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Tunedss86 Offline
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Tunedss86  Offline
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Separate thought, those headers are raw steel? Expect them to rust quick. Even painted ones rust quick, the heat burns the paint off.

#1068281 - 10/15/20 01:59 PM Re: Power for heated o2 sensor [Re: Tunedss86]  
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88ssBrent Online content
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Originally Posted by Tunedss86
Separate thought, those headers are raw steel? Expect them to rust quick. Even painted ones rust quick, the heat burns the paint off.


Thank you! I actually ordered them raw because I needed to tig weld the bungs in and knew I would need to make a couple more modifications. Most companies do crap job on coating. I have a shop local that I use that will blast then coat inside and out.

#1068284 - 10/15/20 02:35 PM Re: Power for heated o2 sensor [Re: 88ssBrent]  
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88ssBrent Online content
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88ssBrent  Online Content
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I was looking through the electrical supplement for the 88 monte carlo. What I find odd is there is only one mention of the choke heater. All the diagrams stop at the idle speed control and oil pressure switch.

#1068289 - 10/16/20 05:01 AM Re: Power for heated o2 sensor [Re: 88ssBrent]  
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mmc427ss Offline
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The C/H 20A fuse supplies power to the choke heater, and the fast idle relay which activates the idle stop solenoid on the carb, when and only when the ECM command the throttle to be open a little on deceleration. That function is to lower emissions. As far as I know that function isn't used often under normal driving. Something that could be deleted from a ZZ4 PROM.

Looking in the Helm's Electrical Supp you will only find the C/H circuit mentioned used in:
Computer Command Control: V8 Vin G 22-2
The Fuse Block Details 11-3
Instrument Panel:Indicator Cluster in my 87 Helm's 80-2

So the Idle speed solenoid shouldn't pull to much current, maybe 3A, and the Choke Heater Coil may pull 8A. A three wire heated O2 sensor may pull another
3A. So it should be safe to have all three on the C/H 20A fuse. 75% load on a 20A fuse is 15A. The choke coil and heated O2 would need to be turned ON when the engine has oil pressure. The oil pressure switch to the left of the dist has that distinct function. It's the only way to wire an electric choke and a heated O2.

I've been running the choke and O2 for the wideband A/F that way for years off the C/H fuse. The idle speed solenoid on the carb is now wired directly into the low pressure switch's load side. When the compressor turns on the solenoid is activated. Sometimes I find the solenoid gets a little lazy when the compressor turns on. You need to tap the pedal to allow the solenoid to extend fully. Being a stick shift it's not a big deal.
Bob

#1068290 - 10/17/20 01:17 AM Re: Power for heated o2 sensor [Re: 88ssBrent]  
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88ssBrent Online content
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Thank you all for your help! I used the c/h circuit and everything worked out.


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