moresparks
Well-Known Member
Engine rapidly loses power under load after just a few minutes.
I have had a number of problems with an aging Volvo AQ171C engine. The previous problem would be the engine would die after a few minutes under load. This time it does not cut out but has very little drive.
Having overhauled the fuel, ignition and carburettors this looks like a different problem on the face of it, so I am not sure where to look next. I now am thinking that maybe the previous problem was just another symptom and not the cause.
I do not have a rubber bushing on the single prop and the only clue this time was that the trim gauge indication had moved slightly.
To recap the work so far, I have replaced:-
Fuel pump, fuel filter, spark plugs and leads, rotor, distributor, ECU and coil overhauled the carburettors and balanced and set idle and mixture etc. In fact I don’t think there is anything left to check. (Advantages of twin engines).
Compression is good and no vacuum leaks, it starts no problem and revs smoothly through the range, I can leave the engine running in reverse (idle speed) tied to the dock and drive exists. Oil pressure and temperature are normal.
So where to look next? The stern drive is the SP290A hopefully looking for some pointers but now fearing the worse that the season is over and a big bill.
I have had a number of problems with an aging Volvo AQ171C engine. The previous problem would be the engine would die after a few minutes under load. This time it does not cut out but has very little drive.
Having overhauled the fuel, ignition and carburettors this looks like a different problem on the face of it, so I am not sure where to look next. I now am thinking that maybe the previous problem was just another symptom and not the cause.
I do not have a rubber bushing on the single prop and the only clue this time was that the trim gauge indication had moved slightly.
To recap the work so far, I have replaced:-
Fuel pump, fuel filter, spark plugs and leads, rotor, distributor, ECU and coil overhauled the carburettors and balanced and set idle and mixture etc. In fact I don’t think there is anything left to check. (Advantages of twin engines).
Compression is good and no vacuum leaks, it starts no problem and revs smoothly through the range, I can leave the engine running in reverse (idle speed) tied to the dock and drive exists. Oil pressure and temperature are normal.
So where to look next? The stern drive is the SP290A hopefully looking for some pointers but now fearing the worse that the season is over and a big bill.
