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View Full Version : Mercury Tech NO SPARK 1999 225 blue water series 3.0


david martin
12-26-2009, 10:02 PM
I am trying to help my brother with his motor and it is not getting spark? He just bought the boat and knows nothing about it. I checked for spark and get nothing. This is a efi motor and has the ecm ignition. Can someone please help me figure this out. What can I check and how do I check it? Thanks
David
I am in Texas(Lake Conroe) right now, not at home in Maryland.
rchevelle71
12-26-2009, 10:29 PM
Unplug the coil packs one at a time until you have spark, the one that remains unplugged is bad. I had this problem, and seems the coils have a common ground, and when one shorts out, none will fire. I am not positive this is your problem, but worth a quick try.
Shaun Torrente
12-27-2009, 07:56 AM
Check the ignition ecu plug make sure it is clean with no corrosion and plugged in (top ecu of the 2)... second make sure the crank pickup is not missing and plugged in, it is located above the starboard head and oicks up off the flywheel... if all that is ok check the inline fuse y the starter solenoid if that is missing or poped you won't have any ignition or fuel pump... if all that is ok then check the coils as rchevelle said

Fel free to call if you have any questions

Shaun
786.229.5801
david martin
12-27-2009, 07:19 PM
I wanted to Thank you guys for the advice. I removed the wire from the coils and the ecm, plugged them back together one at a time and now I got spark.:cheers: Dirty connections was the problem.Thanks again guys.:thumbsup:
David
rchevelle71
12-30-2009, 10:27 AM
Cool,

Glad you got it fixed. I have had a few electrical gremlins with the 3 liters. I now secure all electrical connections with tie wraps, or whatever will keep them in place, and ran redundant grounds on the new motor, purrs like a kitten now.
bernie
12-30-2009, 02:23 PM
One other plug to look at is the main engine harness plug - separate the two and use a knife to spread the noses of the pins a bit so they make good contact when plugged back together. I used to work walleye tournaments for Mercury and lost count years ago on how many pins I would spread to cure an electrical problem.