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Jim Grant's Tech Tips
89
Chevy S10, Distributor Problem
Q: I read your article pertaining to an '88
Chevy S10 Blazer with distributor problems. I have the same problem with
my '89 Chevy Blazer. The information in the article made mention of a
timer 'getting out of phase '. My question is can the timer be adjusted
to be in sync with the rotor or do I need to buy a new distributor? ....Arnel
A: That
reader had a problem with the contacts on the distributor cap and rotor
burning out about every 3,000 miles creating a hard start condition. Once
the distributor cap and rotor was replaced the vehicle would start and
run properly for another 3,000 miles. My suspicions were that the distributor
rotor was not lining up correctly with the distributor cap when the spark
plugs were being fired. This condition can be caused by a component that
is best described as a timer. The timer, in conjunction with another sensor,
provides the "time to fire the spark plug information" to the
ignition module. The timer which is located on the distributor shaft,
just under the distributor rotor, has been known to loosen up and change
position. The result is accelerated distributor cap and rotor contact
wear. It is not necessary to buy a distributor. A replacement distributor
shaft can be purchased from GM at a substantial savings.
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