C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Timing Jumping Around

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Old Aug 12, 2015 | 04:24 PM
  #21  
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Mine moves a degree or 2 when I tighten the distributor down. I usually have to tighten down very slowly when setting timing while watching the timing mark in order to get it perfect. Also, sometimes you can set it a couple degrees advanced or retarded and tighten it so it goes to the right spot when it's tight.
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Old Aug 12, 2015 | 07:11 PM
  #22  
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Originally Posted by C4ProjectCar
How would a faulty ECM affect timing with the EST wire unplugged?
The timing shouldnt jump around with the EST unplugged,
have you checked to see if your outer ring on the balancer isnt starting to loosen up ?
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