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Getting a strange sound from engine

Discussion in '2nd Gen. Tacomas (2005-2015)' started by enigma429ad, Nov 13, 2011.

  1. Nov 13, 2011 at 4:24 PM
    #1
    enigma429ad

    enigma429ad [OP] Well-Known Member

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    I believe it just started this morning, wasn't doing anything out of normal and noticed a weird vibration like it was trying to jerk, and then it did a couple jerks and somewhat back to normal. I then noticed a weird sound but it wasn't constant. On the way home I was able to get a better listen and noticed it would do it if i was going about 50 and then let off the gas for just a couple of seconds. Again it's not on going, just off and on when i release from gas. I kind of want to describe it as a fan like noise maybe throw in some plastic noise to it.

    Sorry not much sleep and can't think of the right words trying to describe it but was hoping someone here might be able to catch on to what i'm trying to say. Anyone have any idea?

    kind of like plastic vibrating
     
  2. Nov 14, 2011 at 9:40 AM
    #2
    enigma429ad

    enigma429ad [OP] Well-Known Member

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    Could it be alternator?
     
  3. Nov 14, 2011 at 9:47 AM
    #3
    wrxRome

    wrxRome Houston's Swamp Rat

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    Your actual truck was jerking? Could be a lose heat shield by the cats??
     
  4. Nov 14, 2011 at 11:12 AM
    #4
    enigma429ad

    enigma429ad [OP] Well-Known Member

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    jerking or stuttering. Best way I could describe it was sorta like someone learning a stick for first time. Hasn't done it again though.or not enough for me to tell if it's truck or wind

    does the sound when letting off gas over 2k RPM and continues until it gets below. Does it other times but that was how I can reproduce the sound.
     
  5. Nov 14, 2011 at 11:38 AM
    #5
    CaptainFun

    CaptainFun That Guy

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    Is this a noise you hear or is the stutter something you feel? ie a vibration or drivertrain shudder?

    Does the noise sound like it's coming from a particular place in the engine bay? Intake, belts, underneath near the transmission/drivetrain?

    Has it been particularly cold recently? Any major services recently?

    I assume you have the 4.0L, correct?
     
  6. Nov 14, 2011 at 11:46 AM
    #6
    CaptainFun

    CaptainFun That Guy

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  7. Nov 14, 2011 at 11:55 AM
    #7
    enigma429ad

    enigma429ad [OP] Well-Known Member

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    i noticed the noise after the stutter. it sounds like it's coming in somewhere in the engine area, hard to say it only happens while moving. And yes it's been cold, but it ran fine while it was low temps, it started on a fairly warm day.

    No major services, just an oil change a month ago.

    And yes, 4.0L automatic.
     
  8. Nov 15, 2011 at 2:08 PM
    #8
    enigma429ad

    enigma429ad [OP] Well-Known Member

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  9. Nov 15, 2011 at 7:52 PM
    #9
    iroh

    iroh Well-Known Member

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    That is so weird. The only thing I've ever heard that sounds like that was a 5th lifter lost motion assembly with a weak spring on a honda.

    It's coming and going, meaning it changes with resonance. Something is loose either inside or outside that engine.

    I may sound like the broken record but what's your oil level?
     
  10. Nov 15, 2011 at 8:25 PM
    #10
    enigma429ad

    enigma429ad [OP] Well-Known Member

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    ...

    I assumed with the oil change last month it would be fine, but when i take stick out second time it looks almost clean. :mad:
     
  11. Nov 15, 2011 at 8:29 PM
    #11
    sean266

    sean266 #ThinBlueLine Moderator

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    So lack of oil was the cause? Have u checked for leaks?
     
  12. Nov 15, 2011 at 9:04 PM
    #12
    enigma429ad

    enigma429ad [OP] Well-Known Member

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    still out getting the oil, but I haven't noticed any leaks
     
  13. Nov 15, 2011 at 9:36 PM
    #13
    enigma429ad

    enigma429ad [OP] Well-Known Member

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    just put in 2qts and it got it to the twist part of the dip stick. started up and let it run a few minutes like earlier today and wasn't making the sound. probably have to get another one or two qts on my way to work. effin blows it was something simple. never had a problem with oil before, but hopefully no damage and that's all there is. I'll have to keep an eye for a leak.
     
  14. Nov 16, 2011 at 5:24 AM
    #14
    sean266

    sean266 #ThinBlueLine Moderator

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    Strange...
     
  15. Nov 16, 2011 at 8:25 AM
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    CaptainFun

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    I'm not sure but if that mechanical sounding noise was a result of low oil levels, there could be some internal damage. If you added two quarts already and need more, than you only had half of the normal oil volume. I'm no mechanic so take my words with a grain or two of salt.

    Bump!

    Edit: You did mention the noise was not constant. I would assume low oil would produce a more consistent noise. Keep an eye out for other causes in case the low oil was coincidental.
     
  16. Nov 16, 2011 at 2:34 PM
    #16
    enigma429ad

    enigma429ad [OP] Well-Known Member

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    well i checked again this morning and had to add more oil, and after i got out of work i noticed a puddle. now i'm not sure where the leak is from, it's dripping down off the plug, but it's on tight.
     
  17. Nov 16, 2011 at 3:03 PM
    #17
    iroh

    iroh Well-Known Member

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    That's not good at all. That may have been a rod bearing you were hearing. Pray a main wasn't spun.

    If the plug is leaking it definitely needs a new crush washer. Look around there for punctures or dents in the pan to make sure it isn't draining down the pan surface and dripping off the plug. Look for gasket leaks too. The 1GR has a tiny steel pan part of a big cast aluminum one so if that gasket leaks - since it's below oil level - it'll just drain away most of your oil.
     
  18. Nov 16, 2011 at 3:07 PM
    #18
    enigma429ad

    enigma429ad [OP] Well-Known Member

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    Stuck my tongue out and got it tighter. hadn't dripped in ten minutes or so. Seemed to be running fine today, just kept checking the levels.
     
  19. Nov 16, 2011 at 3:31 PM
    #19
    iroh

    iroh Well-Known Member

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    Hopefully it's not severely damaged.

    It's really the luck of the draw on that. My first honda's first owner had abused it, and it had somewhat loose rod bearings, just enough that when the engine got hot (>3hrs) the oil pressure would fall to about 5 psi at idle. Almost enough to trip the light. Some oil brands would drop pressure enough to disable the VTEC because it couldn't reach the required 65psi by the 5500 rpm crossover. It burned oil too. On a long trip it was standard procedure to add a quart every 250 miles.

    I put over 80 thousand miles on that car in that condition, and ran better the day I sold it than ever before. I used 10w30 instead of 5w30, ran Mobil 1 which I know many say is just expensive good oil but it cut my consumption down from 12 qts per oil change to 2 due to its high flash point, and checked that oil level religiously every week.

    Or it could be like my roommate's old corolla. It leaked past the valve seals and he doesn't habitually check oil. One day it started tapping, I was like SHUT IT OFF!!!!! but it was too late. It quieted down with oil added but 3 days later it started the tap of death and died 15 miles from home. She'd spun a main and the #4 rod bearing went completely dry.

    If it hasn't spun a main bearing it's a lot easier to rebuild because crankshaft damage is less. Sometimes you can get away with polishing down the crank and using undersized rod bearings. If a main spun though, that usually means the crank's surface is trashed, and the mating surface that holds the main bearing in place is ruined too. That means new engine, no rebuild, do not pass go, and your mechanic collects a whole lot more than $200.
     
  20. Nov 16, 2011 at 3:37 PM
    #20
    enigma429ad

    enigma429ad [OP] Well-Known Member

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    Is there an easy way to check all this stuff? I've just been going on sound and all I hear now is the normal ticking.
     
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