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CEL Light On Code indicates running lean

Discussion in '1st Gen. Tacomas (1995-2004)' started by codystaco, Apr 25, 2010.

  1. Apr 25, 2010 at 8:09 PM
    #1
    codystaco

    codystaco [OP] Member

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    I had code pulled and it indicated that engine is running lean. I just cleaned intake sensor and throttle body intake. Any suggestions on anything else I might try?

    Thanks in advance

    Cody
     
  2. Apr 26, 2010 at 6:13 AM
    #2
    EnolaGaia

    EnolaGaia Well-Known Member

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    Exactly which code was being thrown?
     
  3. Apr 26, 2010 at 4:11 PM
    #3
    codystaco

    codystaco [OP] Member

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    A friend that works at a repair shop pulled it for me and told me that it was running lean. He did not give me the specific code #. I'll take it to Autozone and have them scan it and will get back with info as soon as I can.

    Cody
     
  4. May 3, 2010 at 6:35 PM
    #4
    codystaco

    codystaco [OP] Member

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    Well, work slowed down enough that I got by Autozone and had them pull the codes. It is throwing a P0171. I have not had time to research this out yet. Any ideas before I start throwing moola at it??

    Thanks,

    Cody
     
  5. May 3, 2010 at 6:42 PM
    #5
    ktmrider

    ktmrider Senior Member

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    Junk
    P0171 System too Lean (Bank 1)

    If you have your stock intake I would try that, also the maf sensor may be dirty if that is the intake sensor you are talking about.
     
  6. May 3, 2010 at 6:49 PM
    #6
    codystaco

    codystaco [OP] Member

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    I cleaned the sensor located in the rubber boot between the air filter (K&N cleanable) and the throttle body. I also cleaned the inlet of the throttle body. I used throttle body cleaner and made sure all was dry before putting it back together.

    Cody
     
  7. May 3, 2010 at 7:06 PM
    #7
    lotsoftoys

    lotsoftoys pavement is boring....

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    bunch of crap
    Cody, try that first... ur on the right track. this code could be tons of things. basically any un-metered air getting into the motor after the maf will cause it. do u oil ur a/f? cuz that oil is notorious for covering the sensor and displaying false readings. but since u cleaned it, erase the code(autozone or pull ur negative cable off for a few minutes) and drive around see if it comes back.
     
  8. May 4, 2010 at 4:52 PM
    #8
    codystaco

    codystaco [OP] Member

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    Well, pulled the MAF sensor out, cleaned the hell out of it with throttle body cleaner and q-tips... Got a couple of q-tips worth of crap off of it. Plugged it back in, pulled negative cable off of battery....re-installed neg cable and drove it for 35 miles or so. I noticed much better throttle response, better idling, and looks like possible better fuel mileage(gauge drops quickly at 1/4 tank). Looks like I might be good to go!!!!

    Thanks for all of the input and help!!!!!

    Cody
     
  9. May 4, 2010 at 5:02 PM
    #9
    lotsoftoys

    lotsoftoys pavement is boring....

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    bunch of crap
    right on man! hope that works! and next time just some advise dont use q tips u could accidentially bend on of those small wires. then ur out a whole sensor.... but thats next time ha
     
  10. May 4, 2010 at 7:00 PM
    #10
    ETaco23

    ETaco23 Marshall offroad Fabrication

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    Clean your MAF man!

    And to Cody, I would get rid of that K&N, and get a AFE Pro Dry S filter. Bc that is what is causing so much gunk to get in your MAF/TB. I had the same filter, and had a bunch of crap on mine after only 4-5 months. The K&N filter has been known to do this, Bc of the oil and they dont filter that great.
     
  11. May 6, 2010 at 10:39 AM
    #11
    jreeves

    jreeves New Member

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    I have a quick question. I cleanded my MAF about a month ago and reset the codes. It went for a while and then the light came back on - went off - and is now back on. I went by O'riley's and it gave me the P0171 and they thought it was the O2 sensor. When I cleaned my MAF I used MAF cleaner from O'Riley's. Is there a gasket or something I'm supposed to replace on the sensor when I install it to be sure it's a tight fit?

    Any help would be appreciated.
     
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