violent vibration over 2000 rpm |
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spiralhelix
Senior Member Joined: August-06-2014 Location: IL/WI Status: Offline Points: 496 |
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Posted: August-15-2016 at 6:20pm |
making it easier to finish the thread.
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-Spiral
'89 Sport Nautique |
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1xsculler
Senior Member Joined: July-02-2016 Location: Gig Harbor, WA Status: Offline Points: 130 |
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Problem solved....see THANK YOU 2800 rpm vibration solved.
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desertskier
Platinum Member Joined: December-19-2006 Location: Az Status: Offline Points: 1114 |
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Also, the protec module needs good battery voltage at the input or it won't function correctly. Check the voltage at the 12.5A breaker on the back of the engine. It should be close to battery voltage. If it's low then you probably have some IR voltage drop through the dash wiring.
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1xsculler
Senior Member Joined: July-02-2016 Location: Gig Harbor, WA Status: Offline Points: 130 |
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Two different boats.
'94 Ski Nautique, 351W, TBI, Protec, no red light, severe vibration above 2800 rpm, probably going into Limp Mode and or Protec failing. '95 Sport Nautique, 351W, GT-40, multiport EFI, occasional red warning light on dash but everything else seems good, i.e. runs perfectly. I'll try disconnecting oil press and temp switches on the '94 tomorrow to see what that does before ordering a distributor and carb. |
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Bob, Here's your thread on the warning light I suggest keeping like problems together in one thread since they may actually be the same problem. |
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desertskier
Platinum Member Joined: December-19-2006 Location: Az Status: Offline Points: 1114 |
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Looks like you have several threads going. Is the red dash light still on? If so you are probably in limp mode which may be causing the vibration. If your gauges indicate that you are not overheating and have good oil pressure then you probably have a bad switch. I would disconnect both the oil pressure and temp switches on the engine and see if the problem goes away. The protec will go to limp mode if either of the switches activate.
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8122pbrainard
Grand Poobah Joined: September-14-2006 Location: Three Lakes Wi. Status: Offline Points: 41040 |
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Bob,
Does it run rough with no load as well as under load?
I agree with Brian that the Pro Tech would be suspect. I feel you may get some indication of an ignition issue by using a timing light above the 2000 when it starts to run rough. |
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judyfifacoins
Newbie Joined: August-14-2016 Location: California Status: Offline Points: 1 |
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Euro extremely membership CSGO Skins CSKA Moscow within the membership 4 many years within Musa CSKA performed an overall total associated with 125 category video games rating forty two objectives, assisting the actual group earn 3 times CSGO knives the actual Euro Extremely Category champ and something Euro Mug.
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halfnelly
Senior Member Joined: January-14-2013 Location: Maitland, FL Status: Offline Points: 253 |
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Since you have a 94 with TBI, it could be the ProTec ignition module finally going bad. If that's the case, your best bet is going to be converting it back to a carb with a conventional distributor and coil as ProTec replacement parts are nonexistant. I got rid of the ProTec on my 94 a few years ago and it's never run better. Lots of other members have done the same swap with great success.
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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Bad fuel would be bad at all rpms
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This is the life
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GlassSeeker
Grand Poobah Joined: November-26-2008 Location: Elk Grove, CA. Status: Offline Points: 2421 |
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Check the distributor cap for moisture and corrosion
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This is the life
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1xsculler
Senior Member Joined: July-02-2016 Location: Gig Harbor, WA Status: Offline Points: 130 |
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I installed the new plugs AFTER the first episode of this problem.
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1xsculler
Senior Member Joined: July-02-2016 Location: Gig Harbor, WA Status: Offline Points: 130 |
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Might it be contaminated fuel as my daughter had just installed ten gallons?
If plug wires were crossed wouldn't it run poorly through out the rpm range? |
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Dreaming
Platinum Member Joined: May-21-2010 Location: Tacoma, WA Status: Offline Points: 1870 |
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check to see if you have all your plug wires in the right order? sounds like you have 2 reversed. My motor does this currently (see my engine rebuild questions) but it is due to the 4 and 8 cylinders being at 80PSI compression...
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1xsculler
Senior Member Joined: July-02-2016 Location: Gig Harbor, WA Status: Offline Points: 130 |
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'94 Ski Nautique, 351W with throttle body injection, idles well, runs smoothly up to about 2000 rpm and then proceeds to vibrate violently, almost like it's running on only 1/2 of the V-8, as you increase the speed. When I give it full throttle it accelerates quickly and smoothly for a few seconds and then dies back to a slower speed. I just changed all of the spark plugs. There's no water apparent in the oil. Oil pressure and water temp seem normal. I don't believe the prop or shaft are bent which would be evident at idle to 2000 rpm or on full acceleration.
The next thing I'm going to check is if all four injectors are spraying fuel as the throttle is applied. Like I said, it feels like only 1/2 of the engine is running when it starts to vibrate violently. |
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