1994 Johnson 140hp V4 low rpm vibration

W

wendhall

Cadet
Joined
Sep 30, 2007
Messages
8
I purchased a 1994 Seaswirl Striper with a 140 hp Johnson V4 engine in March. This is my first boat purchase. The engine starts and runs well except during low speed operation it vibrates in/out of the water with the prop engaged or not engaged. I replaced the plugs and plug wires and cleaned the coil connections, checked the recircs for pluggage and good fit, treated and removed as much of the fuel/replenished, with no results and am now looking for any suggestions prior to taking to the local Johnson repair shop. I will attempt to rebuild the carburetors before the repair shop but am now seeking any advice prior to the repair shop visit.

Thanks
Wendhall
 
tashasdaddy

tashasdaddy

Honorary Moderator Emeritus
Joined
Nov 11, 2005
Messages
51,019
Re: 1994 Johnson 140hp V4 low rpm vibration

start motor on muffs, remove one spark plug wire at a time, be aware of any change in the idle, if no change that cylinder probably is not firing. have you done a compression check. post results.
 
W

wendhall

Cadet
Joined
Sep 30, 2007
Messages
8
Re: 1994 Johnson 140hp V4 low rpm vibration

tashasdaddy said:
start motor on muffs, remove one spark plug wire at a time, be aware of any change in the idle, if no change that cylinder probably is not firing. have you done a compression check. post results.
Click to expand...

Compression check was done in March just after purchase. Thank you
 
kenmyfam

kenmyfam

Supreme Mariner
Joined
Aug 10, 2006
Messages
14,385
Re: 1994 Johnson 140hp V4 low rpm vibration

wendhall said:
Compression check was done in March just after purchase. Thank you
Click to expand...

Welcome to iboats. You should post your compression results and do as Tashasdaddy suggests with the plugs. That is a great starting point to solving your problem.
 
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