b1930e5a   
   From: Jim@Artherholt.com   
      
   On 10/26/2010 10:34 AM, Anyolmouse wrote:   
   > On Oct 26, 4:51 am, Jim Artherholt  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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