Moderated Discussion Areas
  ContinuousWave: Whaler Performance
  engine shudders, loses power

Post New Topic  Post Reply
search | FAQ | profile | register | author help

Author Topic:   engine shudders, loses power
david in boston posted 07-26-2001 12:46 PM ET (US)   Profile for david in boston   Send Email to david in boston  
I was out in boston harbor yesterday, by Boston light. On my way back in, as I was throttling up, the engine started to shudder, vibrate and lose power, I pushed the throttle open to full and the engine kicked in and took off like a shot. I stopped and checked the prop. it was clean, so I started out again and the same thing happened again, only this time it was harder to break it out of the shudder. I took the boat in and now wondering what is wrong. Any ideas? it is a 1 year old Tohatsu 70, oil injected. gas lines were fine, vent open. boat is a 72 whaler bass boat 16. thanks David
Bigshot posted 07-26-2001 01:56 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
start with plugs. If not thensome other fuel related issue. Shuttering is usually 2 of 3 cyls are firing. Coils or CDI's etc, do not clear out.
buster1389 posted 07-26-2001 02:27 PM ET (US)     Profile for buster1389  Send Email to buster1389     
I had the same thing happen to me with my 1991 18hp nissan years back. I think that the ignition system got moisture in it. I let it sit for a day and it has bee fine since.
david in boston posted 07-27-2001 10:15 AM ET (US)     Profile for david in boston  Send Email to david in boston     
Thanks for your help, I changed the plugs and will let the engine dry out in the sun today with the cover off. where is the ignition system located? Should I spray with WD40? David
Whaletosh posted 07-27-2001 10:29 AM ET (US)     Profile for Whaletosh    
I wouldn't spray with WD-40, yet. As many people on this forum know I make my living as an electronics tech. repairing chemical instumentation. One of my standard troublshooting techniques is to not change more than one variable at a time. You have changed two already; changing the plugs, and allowing the motor to thoroughly dry out. Neither of these is drastic, nor is spaying with WD-40. but, you goal is to isolate the problem, changing a lot of variables at once con't allow you to pinpoint the problem.


andygere posted 07-27-2001 12:39 PM ET (US)     Profile for andygere  Send Email to andygere     
I had the same problem. It was a loose spark plug. Cheap and easy fix, esp. since I had feared the worst.
Kim posted 07-29-2001 12:05 PM ET (US)     Profile for Kim  Send Email to Kim     
some times you can see a bad plug wire, if you run it a night ( or flushing it at night ) plug wires will spark easy to see ! in the dark . move them a little, might be worth a try.

Post New Topic  Post Reply
Hop to:

Contact Us | RETURN to ContinuousWave Top Page

Powered by: Ultimate Bulletin Board, Freeware Version 2000
Purchase our Licensed Version- which adds many more features!
© Infopop Corporation (formerly Madrona Park, Inc.), 1998 - 2000.