The local shop I use tests your injectors for free. It's not a big thing for them having all the right tools and all.

As for the removing injectors, I think it's a 17 to do the lines and the injectors themselves are a 27, could be wrong.

I used to use a pipe wrench, although I think a 27 socket can also get them.

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306D 1975 (camper) - rusting away
W116 450 SEL 1975 - sold
W114 long wheelbase ambulance, 3 litre diesel 1974

VW Golf 1 convertable - midlife crisis item
VW T4 van - support vehicle