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Truck shakes when idling.

Discussion in '1st Gen. Tacomas' started by sir1123, Oct 3, 2012.

  1. sir1123

    sir1123 [OP] Tacomas FTMFW!!!!

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    Hello everyone. So my truck has done this shimmy/shake thing in idle for a while. I have replaced plugs and cleaned tb. It does it worse when the a/c is on and truck it in idle. I don't really know what it could be. Maybe a vacuum leak? Not sure where to go. Besides from the shaking in idle the truck runs great.
     
  2. NewRider

    NewRider Well-Known Member

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    1. bought it... 2. Mud flap delete 3. BHLM 4. AUX input on factory stereo 5....... Check the build
    Notice the tach next time, where's it idling at? My car has a similar problem after some major engine work and I know that's its caused by the idler not being re-tuned.. Not actually a big issue other than that it causes the vehicle to feel rough at idle... May not be your problem but worth looking into!
     
  3. TACO3

    TACO3 Deer Dropper

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    maybe fuel pump? my dads truck did this.. an maybe air filter :notsure:
     
  4. buzzard1992

    buzzard1992 Yep

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    Mine does the same thing
     
  5. sir1123

    sir1123 [OP] Tacomas FTMFW!!!!

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    My idle with no ac is 680-710 rpm. With ac on it is 840-860 rpm. And what exactly is the idler?
     
  6. NewRider

    NewRider Well-Known Member

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    1. bought it... 2. Mud flap delete 3. BHLM 4. AUX input on factory stereo 5....... Check the build
    I'd have to look up the specs for the trucks but that sounds pretty low and would cause the engine to shake as if it was going to stall.

    The idler is pretty much what it sounds like like, a computer that keeps the engine running at a correct minimum rpm while the vehicle isn't moving. If its not adjusted properly it can make the engine run fast or slow. In your case I'm guessing slow which causes the vehicle to shake when at rest.
     
  7. sir1123

    sir1123 [OP] Tacomas FTMFW!!!!

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    Why would a computer go out of tune. Never had any work done to truck.
     
  8. DGXR

    DGXR Well-Known Member

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    A vacuum leak is possible, but if it runs great everywhere above idle, it sounds like a throttle body or MAF sensor cleaning is in order. How many miles are on it, and has this cleaning ever been done before?
     
  9. pippen

    pippen that was'nt a vitamin!!

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    Shes cammin!! lol I loved how those old 70's fords and chevys had that rough idle that shook the bed side to side.
     
  10. GEORGE STRAIT

    GEORGE STRAIT (Not the real George Strait)

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    how violent is the shaking? Mine has just a very slight shake at idle, but it is not constant. Just wondering if I should also be concerned. Mine idles at around 700 give or take
     
  11. sir1123

    sir1123 [OP] Tacomas FTMFW!!!!

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    Cammin? And the shake is not bad just feel it through the steering wheel and floor. It is like the motor just wobbles for a sec then hats better then wobbles again. And I have replace maf. And cleaned it once. I have 224 k on it and I have cleaned the tb only a little when I replaced my valve covers a while ago but just sprayed a bit of cleaner in it. It didn't look real dirty if I remember correctly.
     
  12. sir1123

    sir1123 [OP] Tacomas FTMFW!!!!

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    I guess I will clean the maf and tb tonight and see how she does. My truck isn't sputtering or anything just a wobble I can feel at idle
     
  13. pippen

    pippen that was'nt a vitamin!!

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    I was just messing with ya man, camming is when someone has a mild/larger cam in a engine and it makes it run at low rpm at idle and shake alot, not your problem though! I dunno what to say except check vacuum lines for leaks http://www.popularmechanics.com/cars/how-to/maintenance/how-to-find-a-vacuum-leak

    I dunno if theres another way of doing this. I've yet to Seafoam my engine, you might look at some posts on here about that https://www.google.com/#hl=en&safe=off&output=search&sclient=psy-ab&q=site:tacomaworld.com+seafoam+1st+gen&oq=site:tacomaworld.com+seafoam+1st+gen&gs_l=hp.3...1956.12492.0.12809.40.38.2.0.0.0.193.2914.33j5.38.0.les%3B..0.0...1c.1.P1Uxej3eeEk&pbx=1&bav=on.2,or.r_gc.r_pw.r_qf.&fp=4c814b5607df3525&biw=1024&bih=653
     
  14. blakes09

    blakes09 Toyota Tech..when im not Fishing

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    hows the motor mounts?
     
  15. sir1123

    sir1123 [OP] Tacomas FTMFW!!!!

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    Well they are 224,000 miles old but still solid. No deterioration. I checked those a while ago thinking that was the problem
     
  16. 2000GTacoma

    2000GTacoma Well-Known Member

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    pull the idle air control valve and clean it well. its on the throttle body
     
  17. Cr250jumper

    Cr250jumper Señor member

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    My truck shakes at idle too :anonymous:
     
  18. BamaToy1997

    BamaToy1997 ASE Master Tech Vendor

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    ^^^ What 2000GTacoma said. The "Idler" mentioned earlier is actually more commonly called the IAC or Idle Air Control valve. Before you cleaned your throttle body the computer (ECM) had calculated the correct position for the IAC based on a dirty throttle body. When you clean the throttle body, it will sometimes fail to correct itself the other direction, and can cause a rough idle. The easiest way to force the computer to relearn is to wipe the memory. you can do this two ways: disconnect the negative(ground) terminal from the battery and allow 30 minutes for the capacitors in the vehicle to discharge, or if you have access to a quality scan tool you can go into the system that way and force a re-learn.
    Some people suggest to disconnect the battery and short the terminals together. This is not a good idea on late-model vehicles. The reason for this is because these vehicles have a DERM module that is part of the airbag system. This DERM has a built in, non-rechargeable battery. There have been cases where shorting the battery terminals have discharged the DERM's internal battery. A discharged DERM battery can cause a failure of the airbags deploying in certain types of crashes. So never use this cable-shorting method to discharge the battery.
    After you have allowed the systems to clear out their memory, you can reconnect the battery terminal and restart the truck (It may stall once or twice when you first start it up) after the truck has started, let it idle in park or neutral with the AC off for 60 seconds. After that, turn on the AC and let it idle an additional 60 seconds before putting it in gear. This normally will learn the IAC new position the fastest.
     
  19. sir1123

    sir1123 [OP] Tacomas FTMFW!!!!

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    Ok so does the iacv come off the tb?
     
  20. sir1123

    sir1123 [OP] Tacomas FTMFW!!!!

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    Whoa thanks for the info. Will do this too.
     
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