10
Jan
I have a Mercury OptiMax 115 outboard. They charge your vessels batterys.
The cylinder is getting fuel but no spark.
Mercury outboard no spark on one cylinder. Mercury Outboard No Spark Step-By-Step how to fix with minimal tools. I have a Mercury 25 HP two-stroke twin outboard. The plugs HT leads and coils are OK but there is no spark at one of the plugs.
It appears that one lead to a coil does not send any power. New switchbox and coils still no spark on one cylinder Test or have tested the trigger. On this particular model it is less likely to be the stator simply because of the way the ignition works on the portable 2 stroke Mercs - if the stator was bad you have NO spark at all unlike other Mercs where a single cylinder or pair will drop out with a bad stator.
This is another sign of possibly a bad coil or missing spark on one cylinder. Cracked or Broken Coil Like everything that is on a boat engine the coil inside your outboard is sealed component. To run properly the coil must remain intact and crack-free.
If you examine the coil and find it is cracked or looks melted. When to disconnect a Mercury Mariner ignition coil. For instance if you have no fire on one cylinder and the DVA trigger reading for that cylinder is low disconnect the trigger wire and recheck the DVA out put to ground from the trigger wire.
I would check the firing order first to make sure everything is right that thing should run like new. Check the plugs first for some difference between them. Maybe pull wires one at a time to locate a bad cylinder the one that does not change rpm.
And make sure that hollow sound is not from no water in there to be on the safe side. Check that there is plenty of gas in the gas tank and that all fluid levels are at the right level. Make sure that all wires are connected properly.
If there is no start from the engine there may be no spark present. Check that the spark plug for the engine is free of decay and is clean. If there is any water on the spark plug check for leaks.
No fire on one cylinder. Since this condition can be caused by the opposite switch Box pack disconnect the whiteblack jumper between the packs and retest. If the dead cylinder starts firing replace the pack that was firing all three cylinders.
A faulty or failing trigger can cause one or more symptoms. Engine fails to run and has no spark possibly on only one cylinder. Engine is hard to start especially after sitting from a run.
Engine is low on power or has a miss. Triggers are very reliable Triggers can fail for one or more of the following reasons. I think my outboard was running on one cylinder Yes you need to verify that you have spark.
New plugs is good but wont matter if you dont have spark. Plugs gaped to 030. Improperly gaped wont hurt anything in the short run.
OMC two cylinder engines run remarkably smooth on one cylinder. The noticeable symptom is a lack of power. Hi Paul Thank-you for your patience on this one.
No Spark would most likely be stator ignition switch or pack. Start by disconnecting the stop wire BlackYellow wire on the powerpack and re-test. If ok the ignition switch shift switch or harness has a problem.
Posted 10-22-2013 1018 AM ET US My 1988 Mercury 115-HP in-line six-cylinder outboard engine also known as a Tower of Power has spark on cylinders 1 4 and 6 but no spark on cylinders 2 3 and 5. I swapped all coils around and they are all good. I replaced both switch boxes and still have the same problem.
Yes I did switch coils and plugs with the same result 2 cylinder will not fire. I borrowed another CDI with no correction. The cylinder is getting fuel but no spark.
I believe that we did test the spark plug wires but I will check again however when I switched coils and plugs I believe that would eliminate the shorted spark plug wire possibility. Mercury 50hp 3cyl year and coil parts number. 4 HP Ignition Coil.
New switchbox and coils still no spark on one cylinder. Mercury 22hp ignition coil. Installing iginition coils - quick question.
No fire or intermittent on one cylinder. Connect a spark gap tester to the high-tension leads coming from the distributor cap and set the gap to approximately 716. Align the rotor with 1 spark plug wire.
Disconnect the trigger wires and connect a jumper wire from the whiteblack trigger terminal to the black trigger terminal on the switch box. Getting No spark on either cylinder. Discussion in Outboards started by zeobo May 19 2010.
Spark plugs- checked out fine- still no spark. No Spark Merc 40hp 4-Cyl 1991. Toadmiller Aug 4 2014 in forum.
I have a 2000 mercury 20hp 2 stroke it has compression it has fuel but no spark it ran with a sluggish sounded like one cylinder was firing so I replaced the plugs and one plug wire was broken so I put a new wire on too and it ran like a scalded dog for about 1 hr went back to the boat ramp and had my buddy get the trailer and it stalled about 4 times but kept turning. Check routing of tan wires. Relocate as far from the spark plug wires as possible.
Check blocking diode in engine Harness. Mercury Outboard 6 Cylinder with ADI Ignition. No fire on the 135 or 246.
Swap red and redwhite wires also blue with bluewhite wires. If the problem moves to the other set of cylinders the Stator is at fault. This motor is a 1986 25hp Mercury XD with recoil start and tiller controls.
I bypassed the onoff switch and installed a new switchbox 110 last night and it still has no spark. From what I can tell via microfiche the only other. I have a Mercury OptiMax 115 outboard.
It will only run on two cylinders. By process of elimination unplugging spark plug wires I have isolated the problem to the top cylinder - the engine wont run at all if the wires on cylinders 2 or 3 are disconnected. I replaced the spark plug in cylinder 1 - no change.
I then swapped spark plug wires -no change. Check the reading on the switch box terminal AND on the ignition coil terminal. You should have a reading of at least 150V or more at both places.
If the reading is low on one cylinder disconnect the green wire from the ignition coil for that cylinder and reconnect it to a load resistor. Home Boat Design Forums Design Propulsion Outboards No Spark Merc 40hp 4-Cyl 1991. Discussion in Outboards started by toadmiller Aug 4 2014.
New Hampshire toadmiller New Member. Your outboard stator is the powerhouse of your outboards ignition system. Most Mercury Outboard Stators perform two important functions 1.
They provide voltage to your switchbox or CDMs. They charge your vessels batterys. A faulty or failing stator can cause one or more symptoms.
Engine fails to run and has no spark.