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TPS SENSOR OR IAC VALVE

Discussion in '1st Gen. Tacomas' started by fouillard13, Mar 1, 2012.

  1. fouillard13

    fouillard13 [OP] Well-Known Member

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    My Tacoma has been acting weird. Its starts and idles at around 800 most times. When i rev it up and drive it and clutch in it stays at around 1200 or 1000. Sometimes when i start it it will idle at 1000. I completely cleaned Throttle body and iac and did deck plate mod and new K and N filter I also tried resetting the computer by unplugging negative post for half hour i also unplugged efi fuse. The OHM reading for the TPS is around .94 ohms and it should be around 1.0 to 2.0 ohms. If i rev my truck up to 4500 and let it drop it will almost always go back to 800 rmp but if i rev to 2000 it stays around 1200. I am thinking its either TPS or IAC.

    Any help would be greatly appreciated
     
  2. fouillard13

    fouillard13 [OP] Well-Known Member

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    anyone?
     
  3. lotsoftoys

    lotsoftoys pavement is boring....

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    bunch of crap
    3.4? Tps go bad all the time brotha
     
  4. fouillard13

    fouillard13 [OP] Well-Known Member

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    yup 3.4! REALLY!??
     
  5. Robertgeejr1

    Robertgeejr1 Well-Known Member

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    I have done all the hi-pro mods for a life time, since I got this truck at a great price, I will be happy with showroom new.
  6. TacoMX

    TacoMX TW's Official anti body-lift pundit

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    subbed, because My truck idles just like you are describing. But it only does it once in a while. But it runs fine other than the occasional idle irregularity.

    Mine is a 2.7 though.
     
  7. fouillard13

    fouillard13 [OP] Well-Known Member

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    I will be replacing the sensor tomrorow with a used one from wreckers just to see if it does anything before I order a new one.
     
  8. fouillard13

    fouillard13 [OP] Well-Known Member

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    well spent the whole day screwing around with it. swapped a different tps and iac and still nothing. If i push down on the little arm that is connected to the butterfly valve it will idle down. I took it off for the 10nth time and the butter fly valve is seated nicely and closed all the way. On one side on the valve it is flush with the wall the other side you can see light. I don't know what else to try. I may go try another throttle body but i am almost at the point of giving up. I have cleaned. reset adjusted swapped 100 times now. Any ideas. Like i said i push that little arm in and it will idle down. I have tried to oil it up. and when i take the throttle body off and open and close the valve it seats nicely but when its on and running it doesn't?
     
  9. fouillard13

    fouillard13 [OP] Well-Known Member

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    i am thinking maybe the vacume throttle opener is not working correctly?
     
  10. fouillard13

    fouillard13 [OP] Well-Known Member

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    i know the vacume line is hooked up and sucking but maybe its the mechanism?
     
  11. fouillard13

    fouillard13 [OP] Well-Known Member

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  12. nofx230

    nofx230 Member

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    yes i too been having idle issues with my 3.4l tacoma, was idling fine but noticed one day that throttle body was dirty so i cleaned it and the maf with electrical cleaner, after i did that the idle started being all wacky, stays at 1100-1200rpm but the weird part is when i slow down from say 60mph and push the clutch in the idle will drop to 1000rpm and keep bouncing up and down to 1500-1800rpm to 1000rmp and back up until I'm at a dead stop then i sits back down at 1100rpm??? wtf i clean the heck outta the throttle body,iac,maf and used starter fluid and checked for any vacuum leaks but nothing.
    the weird idle is the only problem i see with the truck, drives good,cold starts fine,never stalls, its just really irritating because when in between shifts or every time i push the clutch in the idle goes up to 1500-1800rpm
     
  13. nofx230

    nofx230 Member

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    yeah can't really use that spring trick either as every angle i try it binds up,
    linkage is diff
     
  14. fouillard13

    fouillard13 [OP] Well-Known Member

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    ya. What i did was i swapped both iac and tps. reset computer cleaned the throttle body spotless and still nothing. tried spring and worked ok. Got pissed off and took a hammer to the linkage and now it honestly works. It idles down to 800 everytime. it idles at 1000 when i start it but when i get going after about 5 min it drops fso it might be a bad tps. I tried everything in the book. I took the end of my hammer the rubber part and hit a linkage an forced it to close better and it did ahaha
     
  15. nofx230

    nofx230 Member

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    what about when your coasting,because i can deal with a high idle of 1100 but what pisses me off is when I'm coasting and i push in the clutch my idle will bounce from 1100-1800rpm or just sit at 2000rpm until the truck slows down to less than 5 mph and then the idle drops down to 1100????
    problem didn't start till i cleaned the TB and maf, i reclined the TB,MAF,IAC checked for vacuum leaks with starter fluid reset the computer by pulling efi fuse and disconnecting battery nothing:confused::confused::confused:????
     
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