Mercury 525efi wont rev over 4000rpm
07-14-2016, 09:56 AM
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Mercury 525efi wont rev over 4000rpm
took the boat out the other week after a service with new plugs, fuel water separator, oil, oil filters, cleaned air filter and the port engine wont go past 4000rpm,
no alarms and engine run fine up to there, keep pushing the throttles forward and nothing happens, can trim it out and gain maybe like 100rpm?
i made sure that the throttles were getting full travel on the engine
i have swapped the ait sensor with stbd side but had no change, have fitted a new map sensor but haven't had time to take it for a run
it had half a tank of year old fuel we filled it with fresh fuel
stbd engine is running fine
only done about 15hrs
when i did the service i couldn't undo the fuel filter housing on the back of the engine, was swinging on a spanner with it in a vice and it wouldnt undo, plus i didnt want to distort the housing and put boat out of action, but would it throw up a low fuel pressure alarm if filter was blocked?
wheres the knock sensors?, was thinking of swapping them
there is abit of soot on the transom around the exhaust after the run
ideas on what i could look at?
no alarms and engine run fine up to there, keep pushing the throttles forward and nothing happens, can trim it out and gain maybe like 100rpm?
i made sure that the throttles were getting full travel on the engine
i have swapped the ait sensor with stbd side but had no change, have fitted a new map sensor but haven't had time to take it for a run
it had half a tank of year old fuel we filled it with fresh fuel
stbd engine is running fine
only done about 15hrs
when i did the service i couldn't undo the fuel filter housing on the back of the engine, was swinging on a spanner with it in a vice and it wouldnt undo, plus i didnt want to distort the housing and put boat out of action, but would it throw up a low fuel pressure alarm if filter was blocked?
wheres the knock sensors?, was thinking of swapping them
there is abit of soot on the transom around the exhaust after the run
ideas on what i could look at?
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07-14-2016, 09:28 PM
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07-14-2016, 09:42 PM
#10
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