For me the problem with using a pop tester is not with the testing but with the results. When you test a used set or even a set of injectors with new spray nozzles the nozzles may not all will not preform the same. I hate when there is something on the border line and sometimes new nozzles can preform poorly. Do you return it or as my old boss used to say "let it wear in".

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84 300D, 82 Volvo 244Gl Diesel