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Posted on Jan 02, 2017
SOURCE: 1996 Mercury 150 Nitro EFI
Dont have the manual in front of me...recollect that there's two types of warnings. The pulsating warning is oil (starts with 30 minutes of oil left) or the fuel filter (or sperator, something like that) may have water in it. Running outboard with cover off, is a little black box that would have a red light lit if that's the case. If oil full & no red light, may be oil injection system...would also check to make sure lines aren't pinched, etc. Mine has been specific to oil the two times its gone off.
The full non-pulsating is engine overheat. Not sure beyond that.
Not much, but hopefully gets you going.
Posted on Jun 23, 2009
not enough info. what Manufacturers and model? is it out of warranty? here are some troubleshooting tools and procedures since labor rates at your local dealer could be up to $100.00 per hour. before you start I have two Goals for you. (1) If you learn everything you can about your engine you will become more confortable and enjoy it more. (2)confirm that your engine is ok now. is the noise your hearing piston related, or is it ignition missfire. the compression check and the ignition output test will help answer that. Tools(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local dealer). I know all these are expensive but if your going to be a outboard owner you will always need them. Troubleshooting (1) check compression. without the Manufacturer I'm giving you a average numbers. Look at your Clymer manual for specifics. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark output. use a spark gap tester. all cylinders should jump a half inch gap. If all these test prove that the basic operation of the engine are within specification, then we can turn to fuel delivery. unfortunately you didn't give the Manufacturer so I can't give you the troubleshoot procedures for the fuel delivery system. you will need to refer to the manuel. please get Clymer manuel you will apreciate it
Posted on Nov 04, 2009
I run a 175 Evinrude set up similar to this one.
If there are no warning lights or warning beeps you will have a restricted fuel filter or fuel line.
The reason you can throttle up slowly is because it takes less fuel flow to get to that point that way.
And at full throttle it takes more fuel flow to maintain speed.
If there are warnings you will need to get it scanned to find out the cause and have it repaired. Warnings can slow down the engine to help prevent engine damage.
Posted on Dec 26, 2009
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