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FIXED!.. I think ;) Need help chasing down sudden rough idle!

Discussion in '1st Gen. Tacomas (1995-2004)' started by OldChrome, Oct 11, 2015.

  1. Oct 12, 2015 at 1:30 PM
    #21
    nagorb

    nagorb Should be a dang perma mod

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    That's for the 3rz, basically the same though.

    I don't believe we have egrs on the v6 CA or not.

    IMG_20151012_152649722_HDR.jpg
    IMG_20151012_152507269.jpg
    IMG_20151012_152310598.jpg
     
    scocar likes this.
  2. Oct 12, 2015 at 1:34 PM
    #22
    scocar

    scocar Prebunking

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    Oops, my bad, forgot to keep going down the index to the 5VZ stuff :oops:
     

    Attached Files:

    Last edited: Oct 12, 2015
  3. Oct 12, 2015 at 1:40 PM
    #23
    OldChrome

    OldChrome [OP] Well-Known Member

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    Very cool. Thank you.
     
  4. Oct 12, 2015 at 1:40 PM
    #24
    OldChrome

    OldChrome [OP] Well-Known Member

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    Got it. Thank you.
     
  5. Oct 12, 2015 at 1:41 PM
    #25
    nagorb

    nagorb Should be a dang perma mod

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    I keep doing the same! I was doing valve covers etc last weekend and kept wondering why my engine looked so different lol.
     
  6. Oct 12, 2015 at 1:45 PM
    #26
    nagorb

    nagorb Should be a dang perma mod

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    How do you have it searchable? I've got the fsm downloaded from when it was on ttora but there's no way to search. All the PDFs are abbreviated so you have to know what it's under to find it.
     
  7. Oct 12, 2015 at 1:51 PM
    #27
    OldChrome

    OldChrome [OP] Well-Known Member

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    Haha, hate when that happens.
     
  8. Oct 12, 2015 at 2:27 PM
    #28
    OldChrome

    OldChrome [OP] Well-Known Member

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    Looking at the FSM, it states: To prevent deterioration, do not clean the throttle position sensor and IAC valve.

    I cleaned the IAC completely at time I cleaned TB. Others have too. Hope I didn't mess it up.
     
  9. Oct 12, 2015 at 2:35 PM
    #29
    scocar

    scocar Prebunking

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    When I did mine, I took the IAC off and only gently cleaned the soot in the air channels. I did not spray a ton of stuff in there, and I did not crack open the green case. I think I used a rag and a q-tip soaked in TB cleaner, IIRC. I had zero problems. How agressive were you?

    Pics of when I did it
     
  10. Oct 12, 2015 at 2:58 PM
    #30
    OldChrome

    OldChrome [OP] Well-Known Member

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    I went to town on mine. I took off the green (solenoid?) and shot it all out. I've read others do the same on other websites and no one came back with issues. I'm not ruling it out though. Anything is suspect at this point. I just know it ran like silk right after the TB and IAC cleaning.

    I followed a write up for my model truck that step by step described the total cleaning of the IAC.
     
  11. Oct 12, 2015 at 3:18 PM
    #31
    scocar

    scocar Prebunking

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    I imagine a problem with the IAC would likely throw a code. But I don't know for sure.
     
  12. Oct 12, 2015 at 3:28 PM
    #32
    ramonortiz55

    ramonortiz55 Not A Well-Known Member

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    have you tried cleaning the MAF?
     
  13. Oct 12, 2015 at 3:29 PM
    #33
    scocar

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    Yes he did, it is listed in his very thorough earlier post
     
  14. Oct 12, 2015 at 3:43 PM
    #34
    ramonortiz55

    ramonortiz55 Not A Well-Known Member

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    must have missed it.

    i have a MAF laying around if OP needs it to check it out. its a good working one.
     
  15. Oct 12, 2015 at 3:43 PM
    #35
    OldChrome

    OldChrome [OP] Well-Known Member

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    Yeah you'd think it would. I don't think erasing the catalytic converter code I mentioned earlier would prevent new codes from appearing, right? The biggest clues so far to me are that after the TB/IAC cleaning, it ran smooth. Rough idle only became the norm after I continued to feel stumble after TB/IAC cleaning, pulled the plugs, found a blackened/loose plug, replaced with proper plugs = boom, rough idle, yet - no more stumble.

    The old plugs by the way were pretty worn but still ran smooth until this occasional stumble, likely cause was the loose spark plug.

    Another big clue I feel is the cooler weather temperature/smoother idle situation.
     
  16. Oct 12, 2015 at 3:44 PM
    #36
    OldChrome

    OldChrome [OP] Well-Known Member

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    Thank you. I'll keep that in mind if the need arises.
     
  17. Oct 12, 2015 at 3:46 PM
    #37
    ramonortiz55

    ramonortiz55 Not A Well-Known Member

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    It's from a 3rd gen 4runner. 2001 to be exact, 6 cylinder.

    I know a lot of the parts between the first gen taquitos and the 3 gen runners are interchangeable.
     
  18. Oct 12, 2015 at 3:50 PM
    #38
    OldChrome

    OldChrome [OP] Well-Known Member

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    Right on. Thanks Ramon. I will definitely make note that you have the MAF in case I need it.
     
  19. Oct 12, 2015 at 3:53 PM
    #39
    scocar

    scocar Prebunking

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    When you cleaned the MAF, did you just spray off the little bulb at the end, or did you spray down in the tube. I did the former, then was informed that you need to do the latter, too.
     
  20. Oct 12, 2015 at 4:04 PM
    #40
    OldChrome

    OldChrome [OP] Well-Known Member

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    I've actually done it twice. First, when I had the catalytic converter code, but only shot the bulb. In chasing this rough idle, I did it again but shot the bulb and down the tube this time.
     

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