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73-87 Chevy _ GMC Trucks => 73-87 Chevy & GMC Trucks => Topic started by: Joe dinubilo on October 25, 2014, 12:26:13 pm

Title: o2 sensor location
Post by: Joe dinubilo on October 25, 2014, 12:26:13 pm

I have a 1982 chevy c 10 truck with a 305 engine that Im working on for my son. took it to get smogged and they told me that the o2 sensor is missing, can someone tell me where the o2 sensor should be located. I did find a wire hanging on the back of the transmission bellhousing,its a single wire connector. Is that possibly the wire that goes to the non existent 02 sensor.Im in California so no smog means no registration.

Title: Re: o2 sensor location
Post by: bd on October 25, 2014, 01:03:24 pm

The O₂ sensor threads into a hole cast into the left exhaust manifold, directly above the headpipe flange.  The ECM harness connects to the sensor via a single wire Weatherpack connector.

Title: Re: o2 sensor location
Post by: Joe dinubilo on October 27, 2014, 07:23:22 pm

Thanks for the info. Someone must have changed out the exhaust manifold on this truck because there is no place for a o2sensor on the exhaust manifold.

Title: Re: o2 sensor location
Post by: bd on October 27, 2014, 08:34:24 pm

Take a look at this manifold (http://www.ebay.com/itm/76-77-78-79-80-81-82-CHEVY-10-PICKUP-L-EXHAUST-MANIFOLD-8-305-94362-CPD-1390029-/181333622433?pt=Motors_Car_Truck_Parts_Accessories&fits=Year%3A1982|Make%3AChevrolet&hash=item2a38537ea1&vxp=mtr).  Note the pipe plug right above the flange.

Title: Re: o2 sensor location
Post by: roundhouse on October 28, 2014, 05:19:02 am

I thought they didn't get TBI until 87 ??

So why would an 82 have a oxy sensor ?

Title: Re: o2 sensor location
Post by: bd on October 28, 2014, 10:01:57 am

Quote from: roundhouse on October 28, 2014, 05:19:02 am

I thought they didn't get TBI until 87 ??

So why would an 82 have a oxy sensor ?

(Light goes on)  You're right!  Some of the El Caminos had it in 1982, but feedback carburetion didn't go into production on trucks until 1983 or 1984.  The '82 C10 shouldn't have feedback emissions.

Joe, what color is the wire you described, hanging down beside the transmission?

Title: Re: o2 sensor location
Post by: 78BIG-TEN on October 28, 2014, 10:21:13 am

I was thinking the same thing but wasn't sure about California versions.Here in Texas I cant recall ever seeing a truck with feedback carb,only tbi in 87

Title: Re: o2 sensor location
Post by: bd on October 28, 2014, 12:27:40 pm

In California, beginning about 1980, we rarely saw anything other than feedback systems.  They gradually encroached until nothing "traditional" remained.  Trucks lagged behind cars, which included El Caminos & Caballeros, but boasted feedback carburetors by 1983 or '84.  Those were years of discovery....

Title: Re: o2 sensor location
Post by: Dan75k20 on October 29, 2014, 08:41:52 pm

I had an 81 regal with a feedback carb and a check engine light. I never heard or have seen an o2 sensor on a pre fuel injected vehicle

Title: Re: o2 sensor location
Post by: roundhouse on October 30, 2014, 06:40:40 am

If all that's required is a visual inspection
Then I'd install a O2 sensor for them to see

You've had it tested ? 
It passes the tailpipe sniffer ?

You registering it for the first time in Cali?
Or was it registered before ?

Title: Re: o2 sensor location
Post by: Joe dinubilo on October 30, 2014, 06:25:07 pm

THE single wire hanging down on the bellhousing is a brown wire with a weather proof connector. The truck did pass the emission part of the smog check but not the visual. The smog results were considered TAMPER therefore no certificate was issued. This truck is new to my son and yes it had been registered in Ca.before. When my son purchased the truck it had not been registered since 2008 so he paid the back registration fees 500.00 but needs to get it smogged before they issue tags. The exhaust manifold does'nt have any provisions for a o2 sensor.

Title: Re: o2 sensor location
Post by: bd on October 30, 2014, 06:46:24 pm

Could the brown wire be dark purple?  Can you post a pic of the top of the carburetor and the 'brown wire?'

Title: Re: o2 sensor location
Post by: VileZambonie on October 30, 2014, 07:05:18 pm

What makes them think your truck has an Oxygen Sensor to begin with? Is your VECI label under the hood in tact? I'm thinking M4ME if its a 4bbl. Sounds like they need an oxygen sensor to detect how much oxygen they are wasting that the rest of us could be using.

Title: Re: o2 sensor location
Post by: roundhouse on October 30, 2014, 09:03:21 pm

I'd take it to a different station

But you Gota decide if it's easier to try and convince em it doesn't need one or just screw one in and plug thr wire  on

Title: Re: o2 sensor location
Post by: Irish_Alley on November 05, 2014, 01:46:09 am

 back registration fees 500.00? WTH is this??? you have to pay for someone else taking the truck off the road?

Title: Re: o2 sensor location
Post by: roundhouse on November 05, 2014, 07:10:15 pm

Yep.   In Cali and many other states run by liberals
You have to pay the fee sooner or later even if you don't by a tag every  year

Title: Re: o2 sensor location
Post by: Irish_Alley on November 05, 2014, 11:01:56 pm

so if you find a real "barn find" it would have more in back taxes then its probably worth lol

Title: Re: o2 sensor location
Post by: 78BIG-TEN on November 06, 2014, 09:30:50 am

Yep here in S. Texas we saw cars starting in 80 with feedback systems,by 81 pretty much all of them had it barring some imports ,but the had a ton of vacumn hoses to control things.But never saw any trucks with it till 87