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I happen to have the 1981 TDM handy. These are great little books, findable on ebay and cover all the cars in and just before the date of the book. The Classic Center has them too some times.
The 102.98x engine is listed as follows.
Adjust at 4500 rpm to 32 without vacuum attached.
Then test it at different RPMs. The test values are different based on the distributor installed in your car...
Distributor 0 237 003 022:
@idle, no vacuum, 1+/-3.
1500rpm, no vacuum, 14-18.
3000rpm, no vacuum, 24-28.
@idle, with vacuum, should retard 11-13
4500rpm, with vacuum, should advance 8-12 (to be 40-44, total).
With distributor 0 237 002 066:
@idle, no vacuum, 15+/-3.
1500rpm, no vacuum, 16-21.
3000rpm, no vacuum, 26-30.
@idle, with vacuum, (no spec is given)
4500rpm, with vacuum, should advance 8-12 (to be 40-44, total).
With distributor 0 237 003 025:
@idle, no vacuum, 3+/-3.
1500rpm, no vacuum, 16-21.
3000rpm, no vacuum, 26-30.
@idle, with vacuum, 11-13
4500rpm, with vacuum, should advance 8-12 (to be 40-44, total).
HTH -CTH
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