1987 Evinrude 70 3 cylinder

[Tim H]

Hello to all.
My Rude seems to be running on 2 cylinders for several minutes after cranking. It has a definite power loss and the sound is noticeably different than normal. After several minutes, I can actually feel and hear it begin to start trying to gain that 3rd cylinder. Then, bam, the engine sounds normal and runs normal.....Any thoughts to where I should start troubleshooting will be greatly appreciated.
Thanks, Tim H.

 

[papyson]

after the compression and spark checked wire a gap tester I would use an inductive timing light to determine if its a fuel or fire failure... another way to see what cylinder is failing is to pull the plug wires one at a time while the failure is present....the one that don't make a difference is the failing one..

 

[flyingscott]

Sounds like a powerpack failure.

 

[Tim H]

Will a power pack not work sometimes and then work sometimes... It happens only at the initial stat-up.

 

[Tim H]

Ok. I have changed plugs and the next time out it performed great. Then..... the next time it was missing upon initial start-up, but after a few minutes it began running right.

 

[papyson]

troubleshooting is the way to go...refer to my earlier entry...parts replacement with no logic behind it can get expensive..

 

[flyingscott]

go to www.cdielectronics.com and look up there trouble shooting guide. Check all electrical connections make sure they are tight.

 

[faztbullet]

What did the plugs look like as a fouled plug will give same symptoms.Could a flooding carb o water intrusion.