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Oxygen Sensor

Discussion in '1st Gen. Tacomas (1995-2004)' started by shaniac, Dec 6, 2010.

  1. Dec 6, 2010 at 11:53 AM
    #1
    shaniac

    shaniac [OP] Well-Known Member

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    My engine has been idling rough only after it warms up. It seems to idle smooth when you first start her up but after driving it for a while the engine starts to idle rough when sittle still. I have checked vaccum lines to check for leaks and they look okay. My next thought was the EGR valve but I had a gear head buddy tell me that I should start with replacing my Oxygen sensor. I have called for pricing and of course the OEM Toyota parts are outrageous so I called a local parts store and I can get either a Bosch sensor or a Denso. The Denso is a little more and has to be special ordered and the Bosch they have in stock. Does anybody have any experience with either sensors? Is one better than the other?

    Thanks,
    Mike
     
  2. Dec 6, 2010 at 11:58 AM
    #2
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    It sounds more like your MAF and IAC need cleaned. I'd wait on the O2 replacement as you can do the other two for about $10 worth of cleaning products; MAF cleaner and Seafoam and an old toothbrush. What motor exactly?
     
  3. Dec 6, 2010 at 12:03 PM
    #3
    shaniac

    shaniac [OP] Well-Known Member

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    I have already replaced the air filter and cleaned the MAF. I have a 2000 Tacoma (5VZ-FE) V6
     
  4. Dec 6, 2010 at 12:09 PM
    #4
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Well the 3.4 doesn't have an EGR. I would recommend cleaning the IAC (Idle Air Control) valve.
     
  5. Dec 6, 2010 at 12:27 PM
    #5
    shaniac

    shaniac [OP] Well-Known Member

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    I am guessing the IAC is somewhere close to the throttle body? Thanks for your help.
     
  6. Dec 6, 2010 at 12:29 PM
    #6
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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  7. Dec 6, 2010 at 12:44 PM
    #7
    shaniac

    shaniac [OP] Well-Known Member

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    I will try that, thanks for your help!
     
  8. Dec 6, 2010 at 12:47 PM
    #8
    shaniac

    shaniac [OP] Well-Known Member

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    I have read that I should use carburetor cleaner to clean the IAC, Is this correct or do they make anything better to clean it with?

    Thanks again.
     
  9. Dec 6, 2010 at 12:49 PM
    #9
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    Carburetor cleaner is good. Or seafoam. Basically whatever can take off carbon build up.
     
  10. Dec 15, 2010 at 10:42 AM
    #10
    MadeInMaine

    MadeInMaine MadeInMaine

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    Do you put the full pint of Seafoam into the gas tank or pour it into the engine straight in?
    Does it matter?
    Is one way better?

    Cheers
     
  11. Dec 15, 2010 at 10:51 AM
    #11
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    I do a 50/50 method. 50% in the gas tank and 50% in the brake booster vacuum line. Search youtube for a good visual on pouring it in the vac line.
     
  12. Dec 15, 2010 at 11:16 AM
    #12
    shaniac

    shaniac [OP] Well-Known Member

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    Okay. I have cleaned my MAF and replaced the air filter. I also cleaned the Idle Speed Control Valve and the throttle body for good measure. My truck still idles rough and now when I crank it up I have to give it a substantial amount of gas or she feels like she will shut off. I remembered that I filled my fuel tank with the cheap 87% Octane Sam's Club fuel. Last night I was down to a half tank of the 87% and decided to top it off with 93% and now it seems to be running better, cranks up a little better as well. Could this be to a bad oxygen sensor? My understanding of how the oxygen sensor works is that it regulates the fuel/air mixture, is this correct?

    Thanks
     
  13. Dec 15, 2010 at 11:19 AM
    #13
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    The AFR senors does this. The O2 sensor just monitors the CAT. Run that tank of gas out and see what happens with some fresh stuff.
     
  14. Dec 15, 2010 at 11:33 AM
    #14
    asus611

    asus611 Well-Known Member

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    Heads up, I got my Denso AFR sensor through Amazon for $99. Saved insane amount over stealership pricing. If you can wait a few days for the package to arrive its totally worth the wait.
     
  15. Dec 15, 2010 at 11:37 AM
    #15
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    That's a good price. Keep in mind there are two different AFR sensors; one is for Cali models and the other is 49 state emissions.
     
  16. Dec 15, 2010 at 11:44 AM
    #16
    shaniac

    shaniac [OP] Well-Known Member

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    I called the Toyota parts department and according to them, my Tacoma does not have a AFR (that is placed on California spec vehicles only). I have an Oxygen sensor in its place. I will replace that and see what happens. First I will run my tank dry and put some fresh fuel as you suggested and see what happens. Thanks for your advice!
     
  17. Dec 15, 2010 at 11:46 AM
    #17
    98tacoma27

    98tacoma27 is gooder 'en chicken Moderator

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    :woot:

    The AFR's are more expensive too.
     
  18. Dec 15, 2010 at 12:04 PM
    #18
    shaniac

    shaniac [OP] Well-Known Member

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    Yeah, I found that out when I talked to the Toyota parts department... :ohsnap:
     
  19. Dec 15, 2010 at 12:24 PM
    #19
    asus611

    asus611 Well-Known Member

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    Yes, one of the benefits of living in California is the more expensive EVERYTHING.
     
  20. Dec 15, 2010 at 12:30 PM
    #20
    shaniac

    shaniac [OP] Well-Known Member

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    Yeah, and crazy gun laws as welll....just sayin... :goingcrazy:
     
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