could be faulty glow relay I got a book for early 760 D which says the plugs are live when cranking and for up to 14 secs after dep on temp so every thing Ive seen says it should glow when cranking whatever the temp (the light dont come on though) try the hot wire method and you"ll soon see if its the plugs or not. even the current volvo 24d does it and has afterglow despite its multi valve digital wizardry twin turbo vnt etc etc greenbook list for poor hot start reads pump sucking air, fuel leak, timing, fuel filter blocked, glow relay, compresions, and valve clearances etc covers most of it really hope that gives afew ideas yeh the glow light only comes on in the pre heat phase, not when cranking or after glow. just remembered
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