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Mercury 90 hp

Engine runs great. does not idle well. always stalls

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Go a 16th at a time out with mixture screw richen the carb does it pop while idleing

Posted on Jul 18, 2013

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Posted on Jan 02, 2017

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I have a 1995 mercury 3 cyl 90 hp outboard motor serial number 0G255422. The reverse has been woring normally but now the gears just grind when switching to reverse. The shift action is stiff.


Is the engine idling at normal speed? To fast an idle will cause this. If the transmission has its own fluid is it full and clean?

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What is the idle timing for 1993 90hp evinrude


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Engine wants to stall but it dont die and then it runs great


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Missing a vacuum hose on the engine near the firewall i found where one end of the hose goes but not the other. and my 90 mercury cougar has a high idle and cant get it to idle down always have to ride the...


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I have a 1990 90 HP mercury outboard. It is rough idling and surg


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1996 mercury mystique stalls when I stop a red light


I am a Ford tech (35 years) and this is the cause of the problem in about 90% of the cars I see with this problem.
Here are some of the causes of surges, stalls at stops, slow idle speed, erratic idle speed, rough idle and engine hesitation (and other problems), it is in most cases the idle speed control air-bypass valve and or throttle valve and upper intake, these area's get full of gunk and combustion residue over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Apr 29, 2009 | 1998 Mercury Mystique

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