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Injectors. The stock Injector Nozzles have 2 tiny passages inside of the very tip of the Nozzle Pintel/Needle.
On my own Injectors and most of the ones I have pulled from Junk Yards those passages were solidly packed with Carbon.
I don't believe it is possible for a purge do clean out those passages once they are solidly blocked as the fluid will pass around instead of through it.
However, I think if someone did a periodic purge while the passages still were open I think the purge might keep the passages open.
Note that the passages are where the idle fuel is supposed to squirt through. Which is why I think the plugged passages effect the idle.
The thumbnail is a pic of the stock type Injector Nozzle by itself. Look closely and it shows the drilled passages.
Note that the Monark (which I have) and Bosil Nozzles that members commonly used do not have the tiny drilled passages to get plugged up.
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84 300D, 82 Volvo 244Gl Diesel
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