Paul:

I don't understand -- how can valve timing make the spark go wiffy at high rpm? I'd have though the spark is pretty much independent of valve timing, and it looks to me as if it's dying at high rpm.

Peter

__________________
1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!