I second what Brian said... The swap will ck the injector and a different injector in the suspect cylinder will tell you if you have a noisy cylinder. BUT....A cylinder that has run a bad injector could have alot of carbon build-up causing noise. HEY, Life is one big crap shoot

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My Truck.. 2007 DODGE, 5.9 Cummins, 6spd stick, 4X4. My car..1977 240D, OTHER WHEELS...1955 VW Oval window bug, European Delivery (Holland) with a 1700cc, 2 barrel, Porsche drum brakes. 1939 WILLYS Pick-up. 1967 Triumph 200cc Tiger Cub. 1976 Honda 550F 4cyl Motor Cycle.