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  What could cause a bad "skipping" feeling?

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Author Topic:   What could cause a bad "skipping" feeling?
mcpalm99 posted 07-14-2002 09:22 AM ET (US)   Profile for mcpalm99   Send Email to mcpalm99  
I have recently been experiencing a hard "skipping" or slipping feeling under throttle in my 17' super sport lmtd with a 87 Johnson 90hp VRO. I can't seem to find any trends as to when it happens, but when it does, it is so abrupt it feels like a jolt. Could this be bad or dirty gas? if the engine misfires would it feel that abrupt? What else could it be? Thanks for your help.
Jay A posted 07-14-2002 01:01 PM ET (US)     Profile for Jay A    
I hope it's not your lower unit! I had an Evinrude years ago and that sounds like the same symptoms.But one time it was the gear selector at the helm,it did the same thing but it turned out to be failing springs.I had a push button shift box and the srings were going bad and would sometimes slip in neutral until one day it slipped in reverse while doing 30mph! I thought I hit a submerged piling! I ended up losing foward and reversed my way 2 miles back to the dock!
Clark Roberts posted 07-14-2002 01:11 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Clean fuel system (tank'hose./filter etc) and get fresh gas... if this isn't it, do a compression test... if test is good check out ignition from plugs to wires etc.. BTW it sounds like ignition (maybe a bad plug) to me but I've been wrong before (lots of times)! Hope compression is ok cause if not then the engine most likely has broken a ring etc... fingers crossed... Clark.. Spruce Creek Navy
Clark Roberts posted 07-14-2002 01:12 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
The reason I started with the fuel system is that cleaning/maintaining the fuel system is like chicken soup... never hurts... and probably needs it even if engine doesn't skip... same thing for a new set of plugs!!!
mcpalm99 posted 07-14-2002 02:43 PM ET (US)     Profile for mcpalm99  Send Email to mcpalm99     
Clark,
I'll start with the fuel system. How do I actually clean the tank and fuel line.. Soap and water and then dry? I have no idea. thanks
Clark Roberts posted 07-14-2002 06:27 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Mcpalm, start with the tank... pour out all contents and check for water etc. Remove the fuel pick up and check for obstructions... clean with soap (the purple cleaners sold at auto stores are great heavy duty cleaner/degreasers)and water only if very cruddy (rinse and let dry out). Just replace any filter elements and pumping fresh gas through the lines will clean them up... an new squeeze ball may also be a good idea! Just some thoughts... Happy Whalin'... Clark... Spruce Creek Navy
Bigshot posted 07-15-2002 09:39 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Start with prop. Hub may be slipping but I doubt that. If it is like an intermittent "kill" of the engine....chances are lower unit. Check fluid. If filled with metal....you have your answer.
hauptjm posted 07-15-2002 02:37 PM ET (US)     Profile for hauptjm    
Another check: spark plug wires. If they are old, you could have some insulation cracking.
Cpt Quint posted 07-16-2002 09:59 AM ET (US)     Profile for Cpt Quint  Send Email to Cpt Quint     
Mine does this also but it is pretty mild AND it only happens in the "second" gear of prior to plane. It trolls fine and after kick in it planes fine. However in the 1/2 speed mode, when the boat is working hardest to get up on plane, i can feel a slip of something. I would think the prop except it doesnt act like this on WOT. I figure that gear is probably weak between idle and plane +. Or maybe the throttle cable is too low and it causes it to slip in and out of the planing gear. Its not a jolt more like a miss. Any ideas on this in relationship to the above responses
Bigshot posted 07-16-2002 11:15 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Same as above but I am a bit confused on your post. There is no 2nd gear or planing gear. You have forward, neutral and reverse gear only. If you are having other issues then it might be a cable adjustment or a stretched cable but that is easy to tell.
Cpt Quint posted 07-16-2002 12:06 PM ET (US)     Profile for Cpt Quint  Send Email to Cpt Quint     
sorry, I was trying to explain where (on the throttle) this was taking place. Its in forward, doesnt happen at troll, and doesnt happen at wot, happens when motor is in "stress" and trying to reach plan speed. That makes me wonder if its in the cable or the lower unit. I feel like if in lower unit it would be worse at wot??
Bigshot posted 07-16-2002 01:35 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Nope! Most stress is getting boat on plane. Check lower for metal shavings in oil.
Cpt Quint posted 07-16-2002 07:58 PM ET (US)     Profile for Cpt Quint  Send Email to Cpt Quint     
Bigshot, I drained the lower unit. The oil was dark but clean and not milky. There were some dust particles on the drain plugs which I have always considered normal? There was one noticable chip on a plug but really only abou 1/30 size of a sewing needle. All in all it looked cleaner than some other outboards Ive had. Can I rest a little easier on the lower unit theory?
I was thinking it could also be a "kickback sensation" during this "motor stress" with the rack and pinion becuase this "slip" mentioned above is being felt through the steering wheel. What do you think? Its obviously not major enough for me to pinpoint at this time and maybe only time will tell and I need to keep her in operation until the problem becomes more apparent.Thanks for all you help thus far and any and all coments have been very helpful.
grandmufti posted 07-16-2002 10:04 PM ET (US)     Profile for grandmufti  Send Email to grandmufti     
I have had 2 powerpacks on 2 different motors pass away.My first indication that they were dying was an intermittent skip at high speed or getting to WOT.It drove me nuts trying to locate the miss or skip as you call it.After about a year they finally died and I was able to fix it.Ther was never any pattern as to when it would lurch but it was only noticeable at higher RPMs.
Boston Marine posted 07-16-2002 10:57 PM ET (US)     Profile for Boston Marine    
This happened to me on the port engine of a Fountain a while back. I realized after looking everything over that the problem was just a loose screw terminal on the ignition switch for that engine!!!!!!!!!!!!
One minute fix.
Bigshot posted 07-17-2002 09:39 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Quint I would rule out the Lower. If it was lower it would happen all the time and be getting worse.

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