Time to settle a dispute!

[Jay Little]

A friend of mine was telling me my car came with O2 sensors (85GT, manual), I tell him that I didn't remember seeing any when I removed the Y-pipe and converted to an H-pipe. He replies that perhaps they are mounted in the exhaust manifolds. I reply that I can show him my tubular headers (now stored in a box) and dare him to show me where the bungs should be.

He's telling me that any car manufactured after 82 (I think that was the year he said) should have O2 sensors, as mandated by federal emissions law.

I'm 90% sure I'm correct. Can anyone back me up, or shoot me down!

[Muscle_Cars_Only]

02 sensors did not come on a manual 85. the manual cars up till 85 were carbed (no use for an 02 sensor) I might be wrong , and people here will give you the facts , I believe in 83 or 84 the autos came with FI = cpu or ecu . a carbed car does not utilize a cpu to run.

[FoxChassis]

Some carb'd '85 5.0Ls had either one or two oxygen sensors. CFI ('84 and '85 w/ AOD auto) 5.0Ls definitely did. There was no auto with the 5.0L in '83, only the SROD and T-5 manuals were available.

[jeffascmclaren]

Some carb'd '85 5.0Ls had either one or two oxygen sensors. CFI ('84 and '85 w/ AOD auto) 5.0Ls definitely did. There was no auto with the 5.0L in '83, only the SROD and T-5 manuals were available.

That sounds like lunacy. What would the O2's tell the computer...uhh... change the primary jets uh... 3 sizes... I guess... uh secondaries... uh... make that 4 sizes...

hahahaha

[fred414141]

i seem to remember the O2 sensors on carb cars somehow regulated the flow of fresh air the smog pump added to the exhaust system to keep the cat from overheating. experts chime in,don't be shy!

[Dean_T]

I can't see how the Feds could mandate O2 sensors. They usually mandate certain equipment to achieve a goal but O2 sensors by themselves do diddly without a computer to receive their input and affect a change on something else.

To back up what Foxchassis said, my '84 Notch with a T-5 does not have any stinking O2 sensors.

Dean T

[negusm]

Some carb'd '85 5.0Ls had either one or two oxygen sensors.

Explain please. What exactly were they hooked up to?

-Mike

[FoxChassis]

Had to bang my head on my keyboard a few times to recall where I recently had this carb w/O2 sensor conversation before but here:

http://corral.net/forums/showthread.php?t=944313

I had a 82.
...AKA a four eyed car...

maroon just like the car craft project that 'ustahava67" and I worked on....

in california it was available with a 2 barell and a 3 speed with overdrive the P.O.S. "SROD" .single rail shifter overdrive.
the fourth gear was overdrive...3rd was 1:1 but thru the cluster. they broke a lot...it had a 7.5 diff.....
lots of them had lifter problems............hydraulic flat lifter..

kinda mickey mouse exhaust...from each head the iron ext manifold had a pipe...from it they were joined together behind the clutch can and there was the o2 sensor and then the pipe would be a single to the rear along drive shaft to a cat,...and then in front of gas tank it split into two again....
so, ...it had a sensor...it also had a preheating flapper / diverter in the exhaust that would rattle....

I kept it up untill a few years ago.

Now that's the first time I have ever heard of such a thing, and I never did figure out what the deal was.......

[fivonut]

I quick check of a few online auto parts stores does list an O2 as a replacement part for an 85 carbed Mustang, FWIW.

[Jay Little]

I quick check of a few online auto parts stores does list an O2 as a replacement part for an 85 carbed Mustang, FWIW.

I did the same thing, and noticed that some show a three wire O2 while others show only one wire. Of all of the carbed 85GT's that I've been able to look over (and under) I've never seen an O2 sensor or the wiring that would support it. But, I've been wrong before.....

[captnet]

i seem to remember the O2 sensors on carb cars somehow regulated the flow of fresh air the smog pump added to the exhaust system to keep the cat from overheating. experts chime in,don't be shy!

Rockauto.com lists O2 sensors for an 85 4bbl vin M Capri:

1985 MERCURY CAPRI 5.0L 302cid V8 4BBL (M) : Emission : Oxygen Sensor

[negusm]

Interesting. Would love to see a picture of a stock setup in an 85 along with exactly what the thing does.

I have to believe it must only work with the emission system on carbed cars. I have seen tons of 85 carbs and never anything more than the AC throttle kicker (and a choke) is attached to them.

-Mike

[captnet]

Interesting. Would love to see a picture of a stock setup in an 85 along with exactly what the thing does.

I have to believe it must only work with the emission system on carbed cars. I have seen tons of 85 carbs and never anything more than the AC throttle kicker (and a choke) is attached to them.

-Mike

I'll ask my restoration guy about this. My motor at the moment is stock setup although the carb was replaced a while back my understanding a factory replacement. Here's an O2 sensor on ebay for 79-86 mustangs:

http://cgi.ebay.com/ebaymotors/OEM-S...QQcmdZViewItem

Maybe an install guide can be hunted down to see where this thing goes.

[captnet]

Application guide for that O2 sensor says 86 and up both Mustang and Capri.

http://www.bwdbrand.com/web_app/cata...?partnum=OS100

[FoxChassis]

You have to remember that there were different emissions systems/packages available in every model year. For the '85 model year there were six, not including the standard emission system:

California Emissions System (Regular Production Option 422)
California Emissions System Not Required (RPO 423)
Non-California Dealer Order for California Registration (RPO 76N)
California Public Service/Emergency Vehicle Exemption (RPO 766)
High Altitude Principal Use (RPO 428)
Non-High Altitude Principal Use (RPO 429)

[IWL BCNU]

I have all the stock stuff off my 85, so will take a look.

[jonas1022]

California Air Resources Board Standards?

[ethangsmith]

My 86 Capri's 2.3L was carbed and had an oxygen sensor. It was one of the inputs to the EEC IV system and helped control fuel ratio via the fuel control solenoid. I know the carbed 85's certainly didn't have EEC IV (that was the CFI ones) and the ignition was still Duraspark II, so would it be possible that there was a CARB derivative of the 4180 (I think that's the carb that year) that was feedback capable? Just a thought.

[captnet]

My 86 Capri's 2.3L was carbed and had an oxygen sensor. It was one of the inputs to the EEC IV system and helped control fuel ratio via the fuel control solenoid. I know the carbed 85's certainly didn't have EEC IV (that was the CFI ones) and the ignition was still Duraspark II, so would it be possible that there was a CARB derivative of the 4180 (I think that's the carb that year) that was feedback capable? Just a thought.

Where was the sensor bolted in? Don't have original exhaust from the Y pipe back on my 85 Capri 5.0.

[negusm]

I'd love to see a 4180C hooked up for an O2 sensor!

-Mike

[85 Capri RS]

well if any did come with the o2 sensors, no one has them on thier cars these days anyways.

[ethangsmith]

Keep in mind, my car was a 2.3L and not a 5.0L. It was threaded into the exhaust manifold right above where the downpipe connects. Another thing I thought of was that some calibrations of the 1980-1982 2.3L (if you can't tell, I'm a 4 cylinder guy) were equipped with a feedback variant of the Motorcraft 5200. An oxygen sensor read the exhaust gas and sent a signal to a "Microprocessor Control Unit", which combined it with a few other inputs and then output a signal to an externally mounted fuel control solenoid, which then sent a vacuum signal back to the carburetor which moved a control rod up or down to vary the fuel delivery through the jets. The ignition is still Duraspark II on those cars. This is why I brought up the possibility of there being either a feedback version of the 4180 or possibly a feedback-compatible carburetor used instead.

[1993SE]

the 85 carb'd 4 cyl i looked at at an auction had an O2 sensor, it was a one wire, didn't really pay any attention to where it went, i just remember seeing it

[ujslost]

for what its worth, my 79 notch with an auto and 2.3 carbed engine, DOES have a 1 wire o2 sensor. I noticed it the other day and I was like, wow!

[Dean_T]

Hm. Now I'll have to look at my '84 Notch a little closer - I don't think it has an O2 sensor. I might as well check the '83 Fairmont too. California causes weird things to be attached to our cars...

Dean T