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Headers and O2 sensor

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by BMR, Mar 8, 2001.

  1. BMR

    BMR 1/2 ton status

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    I was just curious. Once I put a TPI system in my truck with headers....where do I put the O2 sensor? Does it really matter if it reads only from one side?
     
  2. muddin4fun

    muddin4fun 3/4 ton status

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    You might look into street legal headers. I have some on a camaro and they work great!

    [​IMG] Keep your feet dry [​IMG]
    <A target="_blank" HREF=http://muddin4fun.coloradok5.com>http://muddin4fun.coloradok5.com</A>
     
  3. Esteban86K5

    Esteban86K5 1/2 ton status

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    I just put Edelbrock headrers on my 86 and it had a place for the O2 sensor. Just on one side. I had to plug it cause my truck doesn't have an O2 sensors.

    Esteban
     
  4. HarryH3

    HarryH3 1 ton status Author

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    The stock setup only reads from one side, so you should be fine.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  5. Chewy

    Chewy 1/2 ton status

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    I'm running dual headers with my 87 with TBI. The O2 sensor is only connected on one side. No problems.

    [​IMG] '87 Beast
    Colorado, USA
     
  6. dyeager535

    dyeager535 1 ton status Premium Member

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    Since the intake manifold co-mingles both sides of the manifold, you actually ARE seeing the overall mix. One side of the intake does not feed one bank of cylinders. You want the O2 sensor relatively close to the engine, or, if not possible, run a heated O2 sensor. You can make an easy mix tester out of a heated sensor stuffed up the tailpipe.

    Dorian
    My K5 and Chev/Olds tech/links page: <A target="_blank" HREF=http://www.dorianyeager.com/index2.html>http://www.dorianyeager.com/index2.html</A>
     
  7. 89 Blazzer

    89 Blazzer Registered Member

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    Do you run a heated sensor? How do you find a heated sensor? Do you have to use one from another type of vehicle? This may be my problem, becasue once I put on the headers, I haven't got the MPG I once did!
     
  8. CaptCrunch

    CaptCrunch 1/2 ton status

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    Since we are on the topic... anyone running full length headers w/ an O2? Thought I heard someone makes a O2 bung that bolts on to the collector? anyone know of this?

    1987 Chevy K5 Blazer- 350 TBI
     
  9. Blazer79

    Blazer79 1/2 ton status

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    I'm running an o2 sensor right in the reducer after the collector. I didn't have the heart to drill my new ceramic coated Flowtech Afterburners. So I had a friend drill and weld the bung for the O2 sensor right in the cheap reducers.

    <font color=blue>//////
    <A target="_blank" HREF=http://blazer79.coloradok5.com>http://blazer79.coloradok5.com</A>
    </font color=blue>[​IMG]
     
  10. BMR

    BMR 1/2 ton status

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    Sorry Sulak I completely forgot that you had an O2 sensor.
     
  11. realsquash

    realsquash 1/2 ton status

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    Yes, you can use an O2 with long-tube headers, no problemo. You can buy an O2 weld-on bung from Holley (I like theirs) or from Painless Wiring (both from summitracing.com). Install it into the collector on a header if possible. If not, mount it in a collector on the exhaust side. Also, you should get a 3/4 wire O2 wired up instead of the 1-wire. It's easy to wire up.

    Squash
    <A target="_blank" HREF=http://www.trailrunners4x4.org/users/realsquash>http://www.trailrunners4x4.org/users/realsquash</A>
     
  12. HarryH3

    HarryH3 1 ton status Author

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    Here's the El Cheapo method of getting an O2 bung... Take the sensor into the hardware store and find a nut that it will screw into. Typically it will be too thick, but as long as the threads match then the rest is easy. Cut the nut in half with a bandsaw, so it is thin enough to let the sensor extend well into the exhaust flow. Weld that onto the exhaust pipe. Voila! You've got an O2 sensor bung for 49 cents instead of $5 or $10. [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  13. pcorssmit

    pcorssmit 1/2 ton status

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    Thats what I did, but I was able to find a jam nut that was the proper thickness, then I just welded it into the collector. Been meaning to get a heated O2 sensor, but haven't got around to it (its only been like 3 or 4 years).

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     
  14. HarryH3

    HarryH3 1 ton status Author

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    Pete, did you get the jam nut at a hardware store or did you have to go to a specialty supplier? That isn't the sort of thing I typically find at the hardware warehouse! [​IMG]

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  15. dyeager535

    dyeager535 1 ton status Premium Member

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  16. HarryH3

    HarryH3 1 ton status Author

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    You'd be measuring voltage. The materials in an O2 sensor become an oxygen powered battery at around 600 degrees F. The output voltage is very small, but it varies predictably based on the amount of oxygen available to contribute to the electrical generation process.

    <font color=black>HarryH3 - '75 K5</font color=black>
    <A target="_blank" HREF=http://ThunderTruck.ColoradoK5.com>http://ThunderTruck.ColoradoK5.com</A>
     
  17. 89 Blazzer

    89 Blazzer Registered Member

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    I have seen them in Jegs. Too bad it was about 2 months after I had spent 2 days calling around town, the state and the country! I ended up calling Flowtech, they had a part number for reducers that already had a fitting welded into one side. by they could not sell to me direct. I called JC Whitney, the rep could get them for me at a cost of about $35! I called Flowtech back, asked teh guy if he could somehow get someone fromt he factory to just send me the fitting and I could weld it. He said he couldn't. So I ended up with the $35 dollor reducers. Like I said, Jegs has them for $12 (fitting only).
     
  18. CaptCrunch

    CaptCrunch 1/2 ton status

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    What's the part number (flowtech #) on those collectors w/ the O2 spot?

    1987 Chevy K5 Blazer- 350 TBI
     
  19. 89 Blazzer

    89 Blazzer Registered Member

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    I think it is 10110. They are also listed on their web site. If you have any other questions, let me know.
     
  20. pcorssmit

    pcorssmit 1/2 ton status

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    Don't remeber if it was actually called a jam nut, but thats what it looked like to me. Eagle Hardware had a really good fastener selection, but the whole store pretty much sucks now that its Lowe's. No more Hammerite, etc., but now lots of George Foreman grills and other dumb stuff. The hardware selection is still above average though.

    Pete

    '83 K5, 350 TBI (ex 6.2), 700R4, NP208, Dana 60/14 bolt, 4.56s, Detroits, 3" lift, 15-39.5x15 TSLs
    '97 Dodge 2500 4x4 CC LB Sport, Cummins 5 spd
     

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