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1997 Toyota T100 Question: Idle problems

 

Question

Good cracker 81, Potwin, KS, May 20, 2014, 19:38
 Rookie

In the morning when I first start my truck it idles high until it warms up
As it warms up the idle slowly go's down to a perfect 850rpm
Once I start driving and have come to a stop the idle shoots up to 1800 then I have to stomp or tap on the pedal to bring the rpm down from that point the rpm won't go back to 850 the best I can get it at is 1100rpm
Funny thing is I had no problems until I cleaned the throttle body I wish I would've left it black and dirty at least it idled somewhat better

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  • Answer #1

    Action702 May 21, 2014, 02:54
     Journeyman

    Did you changed the throttle body gasket?
    Check your throttle cables first possible binding....

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    Good cracker 81, May 21, 2014, 12:02
     Rookie

    No I didn't change the gasket because it looks good.
    As far as the cable go's there are no noticeable problems throttle cable is loose when disengaged. Like I said, it was idling fine until I cleaned the throttle body about 2 years ago and after 2 years I'm about to loose my mind

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    Action702, May 22, 2014, 12:51
     Journeyman

    Check engine light is on?

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    Good cracker 81, May 23, 2014, 08:09
     Rookie

    check engine light isn't on

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    Action702, May 23, 2014, 12:16
     Journeyman

    Possible symptoms
    Vacuum leak inspect the hoses
    Idle air control valve- the valve is corroded it could be stuck
    Intake manifold gasket leak or throttle body gasket leak

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    Good cracker 81, May 26, 2014, 07:51
     Rookie

    I took your advice and changed the throttle body gasket
    Now for reasons I can't explain;
    When I first start it in the morning the idle starts out at 850rpm and steadily moves up to 1800rpm's that's totally backwards from last week
    But the driving part hasn't changed. The idle still shoots up to 1800 when coming to a stop
    Today I'm going to pull the cable out and check it but I think I'll just be wasting time. You know I did buy a idle air control valve from a auto wrecker installed it but no change is it possible that one could be bad also. And what are the possibility's of it being the mass airflow sensor sending bad info to the throttle body?

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    Action702, May 26, 2014, 12:05
     Journeyman

    Try unplug the maf sensor
    And start the vehicle see if it makes difference.

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