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Help diagnosing odd/intermittent acceleration behavior

Discussion in '1st Gen Tundras (2000-2006)' started by Openbaffle, Jul 11, 2019.

  1. Jul 11, 2019 at 9:17 AM
    #1
    Openbaffle

    Openbaffle [OP] New Member

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    I have a 2006 Tundra double cab x-sp 2WD with 176k miles on it. I'm getting some odd acceleration behavior that I'm hoping someone can help me diagnose.

    Not always, but sometimes during a drive I'm feeling a loss of power coming from a start. The engine revs and accelerates but it sounds almost like it's in neutral or that I'm driving a much larger, heavier vehicle. It's in the first two gears only, is loud and then quiets down when it makes the third shift. And other times, it's total normal. It's been quite hot here (90s+). Temp gauges are all normal. Just had transmission fluid replaced. Timing belt and WP done at 165k.

    No dash lights on.

    Dirty MAF sensor? I tried to take a video this morning to capture the sound, but I couldn't really capture the sound well to demonstrate the behavior. Thanks for ideas.

    My Tundra:
    2006Tundra.jpg
     
    Last edited: Jul 12, 2019
    speedtre likes this.
  2. Jul 11, 2019 at 12:07 PM
    #2
    speedtre

    speedtre New Member

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    When it makes this sound, does the RPM correlate with road speed/current gear properly, or do the rpms seem to be higher than they should for the road speed/gear you are in?
     
  3. Jul 11, 2019 at 12:17 PM
    #3
    Openbaffle

    Openbaffle [OP] New Member

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    They don't seem overly high -- say 2500 RPM before shifting into the next gear. It's not way up in the 4000s for example. Sound more like a roar/rush of air in the lower gears, sort of like a large dump truck or something coming from a dead stop and getting moving. The power curve (if that makes sense) is certainly different when its doing it vs. not, i.e. I feel like I have to throttle down more to accelerate the way that I want.
     
  4. Jul 11, 2019 at 12:30 PM
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    speedtre

    speedtre New Member

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    Last edited: Jul 12, 2019
  5. Jul 11, 2019 at 1:45 PM
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    bmf4069

    bmf4069 New Member

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    I was thinking issues with the fan too.
     
  6. Jul 11, 2019 at 2:35 PM
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    Professional Hand Model

    Professional Hand Model Fred Brookes

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  7. Jul 11, 2019 at 2:40 PM
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    Professional Hand Model

    Professional Hand Model Fred Brookes

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  8. Jul 11, 2019 at 2:46 PM
    #8
    Openbaffle

    Openbaffle [OP] New Member

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    That's funny you mentioned the fan clutch. I just had that replaced last week because my A/C wasn't working properly. Could it be that it's just engaging now at low gears in a way that it wasn't before?

    BTW, here are the revs in a state that I deem "abnormal" -- you can't really hear the "jet engine" noise, but you can see the revs during when I can hear it. https://youtu.be/avtUI-dE3Jo
     
  9. Jul 11, 2019 at 4:23 PM
    #9
    KarmaKannon

    KarmaKannon Master of None

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    I was just going to ask about the ac having an impact because I have some issues with minor surging with the ac on.
    I didn't hear anything from your video besides your extremely rare lane change indicator. Around me I think most people opt for the stripped models without such luxuries.
     
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  10. Jul 11, 2019 at 5:06 PM
    #10
    Professional Hand Model

    Professional Hand Model Fred Brookes

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    Wonder where is the dipstick?

    upload_2019-7-11_20-5-51.jpg
     
  11. Jul 11, 2019 at 5:08 PM
    #11
    Professional Hand Model

    Professional Hand Model Fred Brookes

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    Nothing out of the ordinary in that video. Without sound its hard to hear what you are hearing. The RPMs seem in line. A short video is not enough info to process the problem.
     
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  12. Jul 11, 2019 at 6:10 PM
    #12
    Openbaffle

    Openbaffle [OP] New Member

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    Thanks. Sorry the video doesn't really accurately depict what I hear. But the "jet engine" clutch fan does seem to match my percept, and it sort of makes sense that I hear it after replacing the clutch fan, condenser and other A/C parts. Just odd that it is intermittent. I just wanted to make sure that the transmission wasn't failing/slipping. It doesn't sound like it is.
     
  13. Jul 12, 2019 at 6:18 AM
    #13
    speedtre

    speedtre New Member

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    Your video, while short, doesn't appear to show any slippage in the transmission. Two questions. 1. Do you really feel an unexpected "power loss" (or rather a change in momentum) or do you think your perception of power/momentum is being skewed by the jet fan noise? 2. Did you notice this issue before/after you replaced all those A/C parts along with the fan clutch?
     
  14. Jul 12, 2019 at 7:36 AM
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    Openbaffle

    Openbaffle [OP] New Member

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    @speedtre -- thanks for the thoughts.
    re: #1 -- I think it may be the later: skewed by jet fan noise, not a change in momentum.
    #2 -- I didn't specifically notice it before I did the A/C work, but the truck is new to me. I'd have to ping the previous owner, perhaps, to see if it's something that I did.
     
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  15. Jul 12, 2019 at 7:40 AM
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    speedtre

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    Well, my money is on the Fan clutch...but not sure if you got a bad one, or if your other one was going bad and what you are hearing now is normal. I will say this...both my 2005 and my 2006 Tundra made the jet engine sound you describe on startup, but it goes away when I shift into gear. I never notice that sound while driving.
     
  16. Jul 12, 2019 at 7:47 AM
    #16
    Openbaffle

    Openbaffle [OP] New Member

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    Yup, I get the jet engine on startup, too. That same jet engine startup sound is what I am experiencing in the issue described here.
    On the startup noise, it's the same before and after changing out the fan clutch. May have got a bad fan clutch, that's a thought.
     
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  17. Jul 12, 2019 at 4:38 PM
    #17
    Openbaffle

    Openbaffle [OP] New Member

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    What about changing out the clutch fan to an electric fan -- like a flex-a-lite 775?

    Was also looking at the https://www.autocoolguy.com fan controller as well.
     
    Last edited: Jul 12, 2019
  18. Jul 14, 2019 at 8:26 AM
    #18
    Openbaffle

    Openbaffle [OP] New Member

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    So I brought it in yesterday to have checked out. They said it was normal behavior. Did a little research on how the fan clutches work too in the process. This video was very informative: https://www.youtube.com/watch?v=UwM4OqsLek4.

    Basically in first and second gear, the fan kicks up and spins at 2000-2500 RPM, which makes the jet engine whooshing sound. I never noticed it, because the other fan clutch that I had replaced was broken and not kicking on correctly.

    I did add a Scangauge II yesterday to monitor the WT and A/T temp. I've been wanting to add this for a bit anyways. So thanks everyone for the help, but I think all is working correctly.

    Screen Shot 2019-07-14 at 11.25.02 AM.jpg
     
  19. Jul 14, 2019 at 8:37 AM
    #19
    Professional Hand Model

    Professional Hand Model Fred Brookes

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    Great video tutorial. Do you know if our fan clutches are spring driven or fan/pressure driven?
     
  20. Jul 14, 2019 at 8:38 AM
    #20
    Openbaffle

    Openbaffle [OP] New Member

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    Well mine has no hoses or anything attached to it, so I think it is as the video describes with the bi-metallic heat sensor, shear plates and viscous fluid all in a sealed system. Someone correct me if wrong, please!
     
  21. Jul 14, 2019 at 8:42 AM
    #21
    Professional Hand Model

    Professional Hand Model Fred Brookes

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    This was my assumption as well.
     

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