Why is my Mercury outboard engine not firing?
It is starting and running, but the engine does not sound like all the cylinders are firing. It sounds like it tops at 4000 rpm instead of 5500 rpm.<br /><br />Only going 30, the cooling system is working ok, and it idles fine, just when trying to cruise it is not getting the speed it should. It is also slow off the line.
How to troubleshoot sudden engine problems in a 1991-94?
You have moisture in the system, water was coming out of the tailpipe, try new ignition wires, high octane gas, lots of gas now has water in it, check the coil. If you car misfires a bit upon starting after rain, that is a clue. Mine did that all the time but after driving for 5-10 minutes it ran fine.
What to do if Mercury 200 EFI wont start or fire?
The caveat is that if it’s a short to ground that’s outside the ECU, you could blow the replacement ECU and they aint cheap. The best solution is to take it in and have the diagnostics run on it. If you have a buddy with the right equipment you might find it quick and get back out on the water today.
What causes a Mercury outboard engine to overheat?
Outboard motors pull water from the lake, river or ocean through an intake to keep the engine from overheating. Debris in the water can get stuck in the intake and cause the engine to overheat. Check the intake for clogs.
Why is my 1991 Mercury carburetor not firing?
1991 25 HP mercury carburetor float stuck. It will not allow 1991 25 HP mercury carburetor float stuck. It will not allow fuel to pass through carb to cylinders. I have lots of spark and no fuel. I have fuel to carb … read more MerCruiser Certified Techni… I have a 2005-2007 Mercury 25 HP 4-Stroke Big Foot motor that I just purchased last night.
Why is my mercury 25 hp engine not firing?
I have a 2004 25 hp mercury. The engine sank in salt water. I have a 2004 25 hp mercury. The engine sank in salt water. Everything was flushed out with fresh water, carbs cleaned, etc.. Now… when starting the engine and in neutral it sounds like its getting … read more
How to troubleshoot a Mercury outboard engine?
Check for a dirty or old spark plug, improper carburetor adjustments, or broken or faulty ignition wires. Air vent in fuel cap not open. Faulty emergency kill switch. Some engines — not the pull-start kind — have a battery that starts it.
Why are the spark plugs on my mercury not working?
I have a Mercury 25 hp serial no oa955924….ran good last fall now spark plugs will not fire. Has been stored in an enclosed shed. … read more Vocational, Technical or Tra… 1991 25 HP mercury carburetor float stuck. It will not allow 1991 25 HP mercury carburetor float stuck. It will not allow fuel to pass through carb to cylinders.