Ignition timing. The way I understand it the EZL senses vacuum, and advances the timing as determined via the R16/1 resistor.

I've got severe hesitation at first, then, as the car speeds up, it becomes more responsive. Which must be because the vacuum is advancing the ignition timing.

Mechanic (I don't trust this outfit) said that the timing was retarded by about 8 degrees, which he attributed to a potential vacuum leak.

Timing chain has about 30,000 miles on it. New guides/rails, so I don't suspect it has jumped.

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Henry Bofinger
1989 560 SEL (black/black)
2001 Audi TT Roadster (silver/grey)