Power loss 75 merc
Submitted by Gibbsy on Sun, 2010-11-14 04:48
Any ideas I am losing power for long periods when heading home from a day out fishing. feels to me like an air/fuel issue flat out the motor is only pulling 3100rpm which is down from around 6500rpm I am also using a huge amount of oil as it is an 05 oil injected motor have had to fill resevoir up after only 30 mile. fuel lines have all been checked for any leaks as well as obstructions to air flow fuel has been fresh both times this has happened and inbetween this happening I have done a 50 mile trip with no problems.
any ideas
davebarry (not verified)
Posts: 16
Date Joined: 01/01/70
Compression test
I would start with a Compression test on the cylinders, as using excessive oil is a sure sign of engine damage, but you don't say if the 50 mile trip also used excessive oil - if not, check your air filter and fuel filter is not blocked, and then onto making sure all your electrics around your ignition is tight, good connections etc.. Then replace plugs and move on to carburettor or fuel injection next... Overheating can also cause sluggishness, so check the water pump and channels are clear..Compression test will give you a very good idea for a start though..