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Thread: 1995 Toyota Corolla idle problems

  1. #1
    drnwnr
    Guest drnwnr's Avatar

    Default 1995 Toyota Corolla idle problems

    '95 Corolla 4A-FE, hasn't been started for 3 weeks,
    after that the battery was discharged so I jump started it. It didn't
    start easily.
    Now it has this problem with idle speed:
    when started cold the idle is low (700), after warmup it's too high
    (1200).
    There's an increase in idle RPM when I move the steering wheel.

    I've been told at the dealer that the idle valve is stuck and has to be
    replaced
    (for a lot of money).
    Is the fast idle valve the only possible cause to this problem?
    If the valve is stuck, can it be somehow cleaned/lubricated?

    Thanks.

  2. #2
    Ray O
    Guest Ray O's Avatar

    Default 1995 Toyota Corolla idle problems

    <drnwnr@...........m> wrote in message
    news:1155295445.235194.230250@75g2000cwc.......... ...........
    > '95 Corolla 4A-FE, hasn't been started for 3 weeks,
    > after that the battery was discharged so I jump started it. It didn't
    > start easily.


    If the battery is left in a discharged state for a long time, it will become
    sulfated and will lose its ability to hold a charge.

    > Now it has this problem with idle speed:
    > when started cold the idle is low (700), after warmup it's too high
    > (1200).


    > There's an increase in idle RPM when I move the steering wheel.


    This is normal. It should go up 100 to 200 PPM when you move the steering
    wheel if you have power steering.

    >
    > I've been told at the dealer that the idle valve is stuck and has to be
    > replaced
    > (for a lot of money).
    > Is the fast idle valve the only possible cause to this problem?


    There is no "fast idle valve" but there is an idle air control (IAC) valve.
    It is not the only possible cause, but in 90 to 95% of the vehicles with the
    symptoms you are describing, a bad IAC valve is the cause.

    > If the valve is stuck, can it be somehow cleaned/lubricated?
    >
    > Thanks.
    >


    You can try cleaning it with carburetor cleaner - if it is bad, you have
    nothing to lose by trying to clean it.
    --

    Ray O

  3. #3
    Ray O
    Guest Ray O's Avatar

    Default 1995 Toyota Corolla idle problems

    <drnwnr@...........m> wrote in message
    news:1155710511.457946.212310@i3g2000cwc.......... ...........
    > Some updates:
    > I sprayed some WD40 into the idle air port,
    > and cleaned the excess oil with a paper towel
    > (a small piece of paper fell in, I hope it won't ruin the engine...)


    In the future, use efi/carb cleaner or isporopyl alcohol. The film left
    behind by WD-40 can attract dirt.

    >
    > This seems to have released the stuck IAC valve,
    > since now it starts with higher idle speed (800) when cold,
    > but runs very low when warm (500).
    > I assume the fact that the valve was stuck got the IAC bimetallic coil
    > (is there such?) out of spec.


    You did not mention whether you have a manual or an automatic transmission.
    The idle specifications differ - vehicles with a manual transmisison have a
    lower idle speed. The correct idle speed may be listed on a label under the
    hood.

    I have not studied the inner workings of the IAC so I can't answer whether
    it got out of spec or no. My guess is the answer is no.

    >
    > So I decided to adjust a bit the idle stop screw, idle speed is now ok.
    > Will this cause any problems?
    >


    No.

    <snipped>

    --

    Ray O

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