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Old 15 May 2007, 11:39 pm
jim beam
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Default Re: linear shift solenoid goes bad too often

ExtremeValue wrote:
> On May 14, 10:57 pm, jim beam <spamvor...@bad.example.net> wrote:
>> Charles wrote:
>>> Charles wrote:
>>>> Solenoids need a surge of current when first turned on to pull it in and
>>>> then considerably less to remain activated.
>>> I should also mention that if you have the solenoid connectors apart, measure
>>> the resistance of the solenoids to ground. They're usually less than a few
>>> dozen ohms. If they show several hundred ohms, they're bad. That increased
>>> resistance causes them to heat up more quickly. A hot solenoid core saturates
>>> magnetically and won't release leading to the flaring.

>> alternatively, solenoids that run hot cook their flyback diodes and in
>> turn fry the ecu. after a while anyway.

>
> I took it to my mechanic and he took it for a test drive, opened hood
> and inspected something while somebody started the engine (put it in
> drive and also at reverse). After that, he said "if you wanna believe
> me, your transmission and everything is fine". He also asked me not to
> pay too much attention while driving.
>
> May be he is right, may be he is wrong. I came back home. That's the
> end for now.


see how it goes.

>
> I found a forum post at http://www.fordforums.com/showthread.php?t=112967.
> This is exactly the same problem as I was/am facing:
>
> =========starts====================
> transmission flare when shifting
>
> Have a 96, 4.0 ohv, 114000 miles on it. Transmission flares when
> shifting from 2nd to 3rd under light load. This does not happen all
> the
> time, but enough to have me worried. Seems to happen only when trans
> is
> at operating temp, never when cold.


different type of transmission - has planetary gears and clutch bands.
adjusting the bands usually fixes that.

> Have read up on this problem, some
> say a bad gasket on the valve body or loose valve body bolts will
> cause
> this. I have a B&M Shift-Plus electronic shift kit that is supposed to
> tighten up the shift. Would it help to install it? I don't hot rod,
> just
> want max life out of the truck.
> Thanks,
> Jack
> ==========ends===================
>

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