My car had a leaking egr. Wetting and mucking up the intake.

Harbor Freight has a pressure gauge that can fit either the glow plug or injectors.

You should adjust the valves before checking.

If the injectors are not spraying well I could imagine increased smoke. They should be pop tested and inspected for a good spray pattern. Member greazzer does a good job.

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85 Merc 300D - Unwinding 31 years of wear
86 VW TD
Mahindra Diesel
Iseki Diesel

In 2007 I didn't own a diesel.