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Will Dirty O2 sensor cause erradic Idle?

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by Chrome Moly, Sep 23, 2000.

  1. Chrome Moly

    Chrome Moly Registered Member

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    Hey gents, Just wanted to know if a dirty 02 sensor will cause an erradic idle?
    Thanx in advance.

    Chrome Moly
    <font color=green>Resistance is Futile</font color=green> [​IMG]
     
  2. K5 NUTT

    K5 NUTT 1/2 ton status

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    No...lose of fuel mileage. Check for vacum leaks...check egr with Mity Vac and see if it holds vacum and kills engine at idle....remove and clean IAC motor....and check tbi mounting gasket and for loose bolts.

    AZBLAZER

    1979 K5
    1976 K5 Chalet
    1972 K10 Suburban
     
  3. Steve_87K5

    Steve_87K5 1/2 ton status

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    my idle was not steady just before the temp sensor in top of manifold went totally flakey.

    SteveB
     
  4. River

    River 1/2 ton status

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    Same happend to me, also the coolant temp sensor.

    Greetings from Amsterdam,

    River `90 K5, 350, TH700R4, NP241, "33, 3.08, 10 bolt F, 10 Bolt R(GOV-Lock)
     
  5. Steve_87K5

    Steve_87K5 1/2 ton status

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    Hi River! when the temp sensor went bad, my exhaust went black and plugs fouled. Computer thought it was very very cold.

    SteveB
     
  6. realsquash

    realsquash 1/2 ton status

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    Dirty? MY O2 sensor has a thick layer of baked-on mud. If you mean fouled, yes, that can affect idle. But I would suspect other components first, unless you are getting an O2 lean or O2 rich code. R u getting any codes?

    Squash
    http://www.trailrunners4x4.org/users/realsquash
     
  7. River

    River 1/2 ton status

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    Steve my idle just kept going from 600 rpm to 1800 rpm up and down think their was a loose contact or something inside the coolant sensor. Service engine soon light came on also. Replaced the coolant sensor and evrything was fine again.

    Greetings from Amsterdam,

    River `90 K5, 350, TH700R4, NP241, "33, 3.08, 10 bolt F, 10 Bolt R(GOV-Lock)
     
  8. Chrome Moly

    Chrome Moly Registered Member

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    Where is the Temp sensor located? And how much is it?

    Chrome Moly
    <font color=green>Resistance is Futile</font color=green> [​IMG]
     
  9. Chili 87 K5

    Chili 87 K5 Registered Member

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    The coolant temp sensor is located at the front of the intake manifold. The actual sensor unit is mounted inside the coolant passage, and has a hex nipple adapter which seats it into the coolant stream. There is a plug-in wiring harness connector that hooks it up to the ECM.

    PS; the sensor is supposed to be pretty sensitive, so fix it or break it, I say!

    Hope this helps!!

    Brian 'Chili' G.
     
  10. hpfire7227

    hpfire7227 Registered Member

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    I had pretty much the same problem, replaced the CTS and nothing happened. I'm still trying to figure it out. I'll let you know what happens.

    10 BOLTS O' FUN
     
  11. realsquash

    realsquash 1/2 ton status

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  12. Chrome Moly

    Chrome Moly Registered Member

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    Idles @ 800 and then shoots up to 1900 rpm at a complete stop.

    Chrome Moly
    <font color=green>Resistance is Futile</font color=green> [​IMG]
     
  13. slodawg

    slodawg 1/2 ton status

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    Hey I hate to even say this but my dads got a 89 F@rd pickup and his is doing the same thing. idle low then go way up. The guy at the ford place said it could be his catalytic converter stopped up not letting the engine breath and exhale right. I dont know if that could cause this or not being as NOTHING I've EVER owned has had one on it. The temp guage has been going crazy lately and he aint thought nothing about that. Maybe this is the culprit. Good to see what ya'll come up with.

    <font color=blue>SLODAWG</font color=blue>
    http://www.slodawg.coloradok5.com
     

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