O2 bung instalation

ElcoDucker · Posted: Fri May 02, 2008 4:17 pm Post subject: O2 bung instalation

What do I need to know about doing this? I have some hooker comps that need the o2 bung installed. I plan to drill it and take it to be welded. Were should it be placed?
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CoyoteOn2 · Posted: Fri May 02, 2008 8:17 pm Post subject: IN THE PIPE

Any area in the collector will be the best location. Pick an area that will make access to the sensor insallation and removal as easy as you can. And of course ~~ watch your routing for the wires, they have to reach, and not touching Headers or any part of exhaust system. But that goes without saying.
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CoyoteOn2 · Posted: Fri May 02, 2008 8:35 pm Post subject:

Giving your question a little more thought ~~~~ if it were my system ~ I would install it AFTER the collector Flange in the exhaust pipe it's self. Then if I ever decided later to change my headers to somethig else, they would not have been modified and easier to sell. Also, an exhaust shop can install the bung for you and it would probly cost less than a welding shop to do it. Also, if your having any other exhaust work done anyways, maybe they will just do it. Are you changing mufflers, adding H or X pipe, having the collector reducer installed ? If you have to make the trip to an exhaust shop any ways, just have them do it.
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Keep the Shiney Side Up
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dougs85 · Posted: Fri May 02, 2008 11:35 pm Post subject:

In my experience you will probably get a check engine light driving on the highway unless you use a heated O2 sensor. The stock one-wire sensor does not get hot enough that far down the exhaust system. Highway driving cools the collector and the pipes.

Of course when this happens the O2 sensor is not sending the right info the ECM needs to control the Mixture Control Solenoid on the carburetor correctly.

Doug
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85 El Camino 305, TH350, K&N, dual exhausts
87 El Camino 305, 2004R, K&N, dual exhausts
1964-1/2 Mustang conv, 260 V8, dual exhausts
2002 Jaguar XJ8, 2000 Harley Road King
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ElcoDucker · Posted: Sat May 03, 2008 12:33 pm Post subject:

So doug, even if its in the collector you still think it wont be hot enought? I had alredy considered this and had planned on the collector to be the solution.

I am adding a full pypes racepro 2.5" system with X.

I need to have my crossmember modified so I think Ill just take it when I have that done, probably a muffler shop.
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theelcaminofactory · Posted: Sat May 03, 2008 2:36 pm Post subject:

You WILL need to use a heated O2 sensor if installed that far back, or if you install it close to the head, you can install a non heated O2 sensor in one of the tubes. But what's confusing me is the fact that your even considering installing these headers and keeping the ECM.

ElcoDucker · Posted: Sun May 04, 2008 8:45 pm Post subject:

Im keeping the ecm since Im not about to go and replace carb and HEI.

So whats involved in installing a heated o2 sensor and where can I get one?

Thanks for the help so far.
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dougs85 · Posted: Sun May 04, 2008 11:12 pm Post subject:

Any auto parts store will have heated O2 sensors, I believe they are used on several makes. I had a heated O2 sensor on my '85 many years ago that was installed by a shop. I don't know how they wired it in but I believe a relay was involved.

I removed it when I got rid of my headers because I got tired of all the hassles associated with them. My '85 has better throttle response with the stock exhaust manifold than I ever had with headers. I don't think they do much for a stock 305 engine anyway. Just my two cents. Other owners have different opinions.

Mike (theelcaminofactory) has already replied that you can use a non-heated O2 sensor installed in one of the tubes.

Doug
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85 El Camino 305, TH350, K&N, dual exhausts
87 El Camino 305, 2004R, K&N, dual exhausts
1964-1/2 Mustang conv, 260 V8, dual exhausts
2002 Jaguar XJ8, 2000 Harley Road King
Lakewood, CO

Lenny Carey · Posted: Mon May 05, 2008 9:36 am Post subject:

You may want to get the June 08 issue of Super Chevy. On page 68 is a photo of a bung being welded to a header. They advise positioning the sensor away from the bottom of the exhaust to deter any contaminants from entering the sensor. The article is about installing a Professional Products new Projection EFI system in an 87 El Camino with a 350 ( the newer EFI system that looks like a carb ).
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mnunn · Posted: Fri May 09, 2008 7:49 pm Post subject:

I added non-heated O2 sensors in the 3:00 position to the collectors in my truck's long-tube headers. Even in the Summer time when sitting at idle, they cool off and quit sending their signal. Situ would of course be much worse in the Winter.

Not a big deal in my non ECM truck when what I'm looking for is a highway cruise mixture estimate. But, would definitely cause a code set in an ECM controlled vehicle.

Heated sensor would be the only option IMO.
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