Interesting Failure on 1998 4Runner

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Old 26 Oct 2010, 04:51 am   #1 (permalink)
Jim Artherholt
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Default Interesting Failure on 1998 4Runner

I recently had an interesting failure on my 1998 4Runner. The symptoms
were reduced power, ~20% lower gas mileage, and an occasional
miss/hesitation. The miss was taken care of with new ignition wires and
plugs and replacement of one coil. However, the reduced power/higher
gas consumption remained. It was eventually traced to a faulty timing
belt pulley on the crankshaft. A piece the width of the keyway had
broken out adjacent to the keyway and allowed the pulley to rotate back
and forth about 10 degrees on the crankshaft rather than staying in a
fixed position. This caused the timing to vary with
application/reduction of power, causing the problem. When the mechanic
ordered the new pulley (from Toyota), he was told that the problem was
not uncommon and that they kept the pulley and bolt in stock because of
that!

Just thought you might be interested in this failure.

Jim
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Old 26 Oct 2010, 09:34 am   #2 (permalink)
Anyolmouse
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Default Re: Interesting Failure on 1998 4Runner

On Oct 26, 4:51*am, Jim Artherholt <J...@Artherholt.com> wrote:
> I recently had an interesting failure on my 1998 4Runner. *The symptoms
> were reduced power, ~20% lower gas mileage, and an occasional
> miss/hesitation. *The miss was taken care of with new ignition wires and
> plugs and replacement of one coil. *However, the reduced power/higher
> gas consumption remained. *It was eventually traced to a faulty timing
> belt pulley on the crankshaft. *A piece the width of the keyway had
> broken out adjacent to the keyway and allowed the pulley to rotate back
> and forth about 10 degrees on the crankshaft rather than staying in a
> fixed position. *This *caused the *timing to vary with
> application/reduction of power, causing the problem. *When the mechanic
> ordered the new pulley (from Toyota), he was told that the problem was
> not uncommon and that they kept the pulley and bolt in stock because of
> that!
>
> Just thought you might be interested in this failure.
>
> Jim


How many miles at time of failure? 5VZ engine?

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Old 26 Oct 2010, 06:32 pm   #3 (permalink)
Jim Artherholt
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Default Re: Interesting Failure on 1998 4Runner

On 10/26/2010 10:34 AM, Anyolmouse wrote:
> On Oct 26, 4:51 am, Jim Artherholt<J...@Artherholt.com> wrote:
>> I recently had an interesting failure on my 1998 4Runner. The symptoms
>> were reduced power, ~20% lower gas mileage, and an occasional
>> miss/hesitation. The miss was taken care of with new ignition wires and
>> plugs and replacement of one coil. However, the reduced power/higher
>> gas consumption remained. It was eventually traced to a faulty timing
>> belt pulley on the crankshaft. A piece the width of the keyway had
>> broken out adjacent to the keyway and allowed the pulley to rotate back
>> and forth about 10 degrees on the crankshaft rather than staying in a
>> fixed position. This caused the timing to vary with
>> application/reduction of power, causing the problem. When the mechanic
>> ordered the new pulley (from Toyota), he was told that the problem was
>> not uncommon and that they kept the pulley and bolt in stock because of
>> that!
>>
>> Just thought you might be interested in this failure.
>>
>> Jim

>
> How many miles at time of failure? 5VZ engine?
>

125,000 miles and yes, 5VZ engine.
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