Hey guys,
I have a persistent nailing issue on my 1981 300SD. It occurs on multiple cylinders, at first constantly then more-so under light load, often until 10-15 minutes of driving fully warmed up. On B50 or biodiesel, said nailing disappears.

I have a fully rebuild head, #1930 injectors, timing chain, about the only thing I haven't done is IP timing. (Cam Timing is fine - new TC last year) Is it worth attempting to adjust the IP by ear? I have ordered a drip tool but it won't be here for two weeks and i hate to drive with this noise. The engine has great compression and IP timing is the only culprit left that I haven't checked. The mark on the IP is already lined up to the mark on the block as far as i can see.
As an aside but perhaps related, despite starting very quickly the idle is fairly horrid until fully warmed up and even then not stellar.

Thanks in advance!

__________________
-1981 300SD 242k, stock - sold @ 250k
-1994 Toyota Pickup 4x4 R150F 5 Speed, 5VZ V6 swap.
-2004 Volvo V70-R 2.5T