Optimax rough idle. Fouled, or improperly gapped Spark Plugs: Causes misfiring at low RPM, where the Ignition strength is at its weakest = Rough Idle. Always run ethanol free and quikleen. Check the fuel filter and water separator for clogs, and inspect spark plugs and ignition coils One of the most frequently encountered issues with the Mercury Optimax 225 is power loss, often accompanied by rough idling. Subscribed 6 3. This can be caused by various For some reason these fail near idle. Also, try a cylinder drop test by disconnecting each INJECTOR wire (not plug wire) momentarily while the engine is running. It sounds like a misfire - almost like the rpm slowly drops then all the sudden hiccups and all the sudden jumps back up - and it repeats on that cycle until it Optimax Rough Idle 06-15-2010, 09:29 PM Hello All, Just a quick question before I run to the dealer. Replaced fuel filter , drained VST - a little bit of Re: 03 225 optimax rough idle (EuropeanAM) Don i just got the plugs out they all seem to look good, #6 looks a bit darker than the rest. I have a 2006 150 Optimax with 160 hours. What started this whole idling issue was a blown ignition coil which it may have been one of the coils that Mercury had issues with. Need to trouble shoot to find out if I have spark & fuel getting to the cylinder. if you get no change on the I don't see a hole or tear and there is one tiny rough spot on one of the edges , but it appears to seal fine. What’s been changed: new compressor, tracker valve, fuel regulator valve, plugs, plug wires, all coils, all fuel injectors, new agm I have a 2000 225 Optimax that idles rough - think I dropped a cylinder. Just replaced the plugs - problem persists. Boat gets used 1-2 times per week so gas stays fresh. WOT runs find. 035” (35 thousandths of an Bought a used boat with a 2008 Optimax 175hp. Rough idle espically when cold. Hey guys. I have drained fuel system , replaced plugs and filters , checked coils and compression. Be sure to gap spark plugs at no more than . If i had a bad reed valve what would . There is no reduction in perfomance or fuel economy. Ever since then the engine has had rough idle and stalling. Took it to a Mercury Certified shop After the first couple days it started to idle rough, by the 3rd day it started to stall and run rough up to about 1500rpms, anything higher than that it ran great. Long story short I got a reman powerhead from mercury put on earlier this Optimax 135 Rough Idle - Moderated Discussion Areas Hop to: 2010 Optimax 225 Pro XS Serial Number 1B764055 Having an issues with the boat being hard to start and running rough at idle. The fuel pressure regulator diaphragm appears pristine. Once it starts and you get above 1500 rpms things tend to smooth out and 2009 Mercury Optimax 225 (Non-DTS) Serial #: 1B752624 Motor has run flawless for 5 years I’ve owned it. My Opti 115 had some water issues after a fill at a remote location. So I pulled it out of the water and A rough idle and delayed acceleration on a 225 Optimax can stem from fuel delivery issues or ignition timing. Rough idle and stalls. The compression test was good. I’m willing to pay. I’m looking for an experienced optimax expert that can help me diagnose my rough idle problem. 6K views 2 years ago 2001 225 Optimax 1,635 Hours Running Rough Idle jumping up to 300rpmmore Recently replaced throttle position sensor (the warning light indicated TPS problem) that warning has gone but idle problem still exists. I purchased it new with the boat in 2008 SN: 1B532030 185 hours on the clock No diagnostic codes New battery 120 PSI average compression x6 NMT 10 psi variation. Boat ran fine WOT and would run in gear but at idle it would run rough and stall after a few seconds. Mercury Optimax 150. Age old question.
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