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Re: Timing Jumps in ESC Bypass Mode/Rough Idle
Pull the distributor. Check the shaft for radial and axial play. Radial play should be 0.001-0.0018" Axial play can be up to 0.045" before problems will occur. When you have it out, also look at the gap between the pickup coil poles and reluctor poles. It should be consistent, but with no mechanical interference.
With the EST in bypass mode, there should be NO advance ECM and NO variation/wandering of the base timing. If the distributor is sloppy, or the HEI switching module is not getting good signal or not relaying it reliably to the coil primary, you might see variation.
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