engine problems

I just changed my risers, manifolds and spark plugs everything from the elbows down seemed fine. After starting the boat and taking it for a test drive I notice at very slow speeds near idle a knocking/studder noise coming from the engine. I didn’t have this problem prior to changing everything...

Is it a difficult task to take apart and clean injectors? I'm a novice on engines, and can do basic maintenance but I've never cleaned injectors before and I believe that's a reason for my engine having issues. I've replaced the fuel filter and I'm still having some hesitation/jumping until I'm...

I have some serious problems with my 2005 320 sundancer Mercury engines over the last couple years. Most recently had the exhaust manifold blow out flooding the engine with salt water destroying the engine. We are Meticulous in maintaining our engines, flushing the engine with salt away for 15...

Ok, my boat has died twice on me now and gives me about 20mins of no start or no idle and then will run perfectly for the rest of the day. Sorry for the long post, but I'm trying to be as descriptive as I can. First occurrence, boat starts normally runs normally in idle speed/slow speed...

please help me.... wen i put my boat on lake and start the engine its start verry good but if y runnit like 30-45 nimutes then stop the engine like 5 minutes its start verry good but if i stop the engin like 20 minutes the engine dont start , i change the oil - oil filter - spark plugs -...

mercruiser 5.7 1996 alpha one dnt start please help me.... wen i put my boat on lake and start the engine its start very good but if y run nit like 30-45 minutes then stop the engine like 5 minutes its start very good but if i stop the engine like 20 minutes the engine dint start , i change...

I have a mercruiser w/300 hr that every time I take it out around thirty min later it blows a little black smoke and dies and it will not restart,I smell alot of fuel,I replaced coil and a new carb but it still does it,fuel pump works great and there are no visible contaminations in the fuel,it...