You need a digital manometer or a smoke test to go any further. You can get a good manometer off Amazon for around $30 or so, and it is a useful tool in any toolbox as you can use it on any car as well as around the house. Smoke testing hardware is a bit more expensive and dedicated to one thing.
Without information from one or the other diagnostic tool, you cannot go any further.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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