I am rebuilding my fuel injectors with Monark nozzles. 1984 300D. 327,000 miles. I do not know when they were last serviced but the car is smoking a lot, has very poor fuel mileage and stalls a few times before it will stay running when I start it.

I have the injectors out and pop tested each one before I took the first one apart. The pop pressure on each is right around 1800. The spray pattern on the old nozzles is, I think, very poor at best. This is my first time doing this so I have not seen a new spray pattern, but I just get a constant downward stream with no popping. I believe it is call peeing. (I wonder why. )

When I finish cleaning the injector bodies and put in the new nozzles, should I expect the pressure to be about the same or will it improve with the new nozzles? That is, is the lower pressure I am seeing because the internal spring in the injector has weakened over time (327K miles) or is it the old worn and dirty nozzles? The FSM says 120 bar or 1740 psi is OK for used injectors. 135 - 143 bar or 1958 - 2074 psi for new.

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