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Chirping during acceleration

Discussion in 'Technical Chat' started by jsb12900, Jul 19, 2014.

  1. Jul 19, 2014 at 9:21 AM
    #1
    jsb12900

    jsb12900 [OP] New Member

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    Vehicle:
    '07 PreRunner
    Details: '07 PreRunner double cab automatic V6, purchased with 120K a few months ago, I haven't done any mods and I don't believe any were done by previous owners

    Problem: From a dead stop, there is a chirping noise from under the truck as it accelerates. The noise is not coming from a belt or bearing in the engine bay. It is not the type of constant squeal that you have with a bad water pump bearing, fan bearing or belt but more akin to the rhythmic click of a bad valve. It is most definitely cylindrical in nature and is directly related to tire RPM. A slow acceleration means a slow chirp and the frequency of the "chirping" increases as the truck accelerates. If I let off the power, the sound goes away and will resume at same frequency when I get back on the gas. Shifting is normal and does not affect the noise at all. It only occurs under power and will diminish as speed increases and will eventually cease around 35-40 MPH. Does not occur in reverse and does not happen in neutral when I rev the engine. I have greased the u joints on the drive shaft (stock, 2 piece) and the hanger bearing with no improvement.

    Any suggestions would be greatly appreciated. Thanks-
     
  2. Jul 19, 2014 at 9:46 AM
    #2
    scottalot

    scottalot Tacomaentia <- My sickness

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    tolattocS
    32.7833° N, 79.9333° W, and HBS Thread
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    Wife, kid, and a dog. Sold 2013, sold 2014 Tacoma. All listed stuff was on the '14 Bed Mat, WeatherTech Rain Guards, Ultra Gauge, TW Sticker amongst others, Useless Free OEM Bug Deflector, Flyzeye, OME Kit with 885's and Dakar and Nitro Shocks front and Rear . Tailgate mod, SOS Concepts 1/4" Skid Plate, White LED's interior Dome and Maps, Goodyear Wrangler MTR Kevlar 275/70/17, Wet Okole Seat Covers - full piping in Charcoal Grey, Lamin-X Green Fog light film, 17"x8 -10 offset Level 8 MK6 wheels in Gun Metal Finish, SOS Concepts Sliders W/ Kickout 12/21/14, Stubby antenna, LED reverse lights, lift removed 2/20/15 - making changes and trying to make up my mind
    Have you tried a better grade fuel? Sure its not the normal Taco tick? My 14' has a little tick, doesn't bother me, these engines are noisy - all the aluminum in them doesn't aid in noise cancelation
     
  3. Jul 19, 2014 at 9:51 AM
    #3
    1stacoma

    1stacoma Well-Known Member

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    Supercharger? No..


    In all seriousness I know you said you grease the u-joints but your descritpon sounds like u-join. Also if they were greased after going bad grease might not fix. Are the loose?
     
  4. Jul 19, 2014 at 10:05 AM
    #4
    totmacher

    totmacher Well-Known Member

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    Being a "chirp" that happens under load, I'd try changing at least 1 u-joint anyway. The one furthest back near the axle. It seems prone to go first based on what I read in these forums when my truck started chirping.
     
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