A friend of mine brought his W123 300D ( Non turbo ) to me to try and sort out his intermittent idle problem. - Usually the engine purrs nicely but then every now and then the idle speed drops and engine runs roughly. When this occurs I isolated the problem to #1 cyl - ( by disconnecting each fuel line in turn #1 did not have a affect ) . When engine runs #1 is fine as are all other cylinders. I initially checked spray pattern on the tester - Ok . I replaced the injector with a known good one and the problem was still there. I then replaced dellivery valve an dth eproblem is still present. I am now a bit stumped - coul dit be a stuck injection pump element? what about an engine valve not closing? Any ideas are welcome!
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