Sputtering out after high speeds |
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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Posted: May-29-2015 at 12:10pm |
I have a 1994 hydrodyne with a pcm 351. so i run it at full throttle, it tops out at about 40 ish. then i come back down to idle for a little. when i start giving it gas again it sputters out, at about 20 and cant get going faster than that. after cruising around for about 15-20 min it seems fine again and runs like normal. It seems like it might be starving for something or loosing a cylinder. its not a big deal, i just wont go full thottle anymore. skier speed seems to be just fine, and the lake is so small it take about 5 seconds to get across the lake at full thottle anyway. just want to know what is causing it. thanks
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phatsat67
Grand Poobah Joined: March-13-2006 Location: Indiana Status: Offline Points: 6148 |
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Is it points or electronic ignition?
My finger would point towards the coil or the ignition pickup (if it is electronic) getting hot from the higher spark rate then cooling back down after it runs lower rpms for a while. |
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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it was originally electronic fuel injection, but was converted to carb by the previous owner. maybe that could have something to do with it?
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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so to answer your question, im not really sure. there is a distributor, so i guess points. but the spark plugs don't plug into the distributor, there is a wire harness that attaches to the distributor that runs to some kind of coil maybe? and then the spark plugs attach to that.
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SNobsessed
Grand Poobah Joined: October-21-2007 Location: IA Status: Offline Points: 7102 |
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Pictures would be valuable here.
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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so this weekend we took the boat out. after wakeboarding for a few hours we brought the boat back to the dock to empty the fat sacs for skiing. took about 30 min or so. after about an hour we got back in the boat for some slalom. after 15 more min i pulled my friend out of the water just fine and was getting up to speed, at about 25 mph it would just misfire and wouldn't let me go any faster. this happened every time we tried to accelerate past 25. it will hold at 25 and run perfectly normally, but anything past 25 it misses badly, i am new to slalom and it was my first time out for the season, so i just wanted to practice getting up, after a few attempts i got up and the boat ran perfect i got a few passes in at 36 mph, we swapped skiers and we got a few more passes in, and once again out of no where it started missing and we went back down to 25. ill try to get some pics today. but it seems to be getting worse.
any suggestions? electrical? Fuel? Spark plugs? |
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spiralhelix
Senior Member Joined: August-06-2014 Location: IL/WI Status: Offline Points: 496 |
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Is this still the same problem that started the thread or did that resolve and this is now a different issue? Pics would definitely help.
Have you checked timing? are the advance weights moving or are they stuck? After that, check the pipeline of spark from coil to plugs. Though it might be redundant to check spark from coil, pretty simple to rule it out.
how does the fuel look when squirting into the carb? was the carb brand new, rebuilt, crusty junk pulled off the shelf? |
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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same issue that started this thread. it seems to be happening more often now and i would really like to fix it.
carb was brand new as far as i know. ill check how fuel looks, i think im just going to go ahead and change out spark plugs what do you mean by check the pipeline of spark fom coil to plugs? |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13511 |
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pictures.
now. |
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spiralhelix
Senior Member Joined: August-06-2014 Location: IL/WI Status: Offline Points: 496 |
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lol HW.
pipeline: I just mean, test the spark coming from the coil, then test the spark from each plug wire, then test the plugs themselves. The spark should be the same along each path. For instance, when I was testing my ignition, we did each wire, then the plug on the wire and when I got to #5 wire it was similar, but the plug had a different spark. replaced all the plugs and was back on track. |
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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here are the pics! LOL every one loves pictures.
it doesn't seem like there is any advance mechanism under the disturber cap. so posiably whatever advances is going bad? |
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5693 |
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Yeah that's a protec setup, its going bad and very likely the cause of your issue. A new ignition system will probably be your best bet. Do a site search on protec ignition failure or replacement to learn more.
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spiralhelix
Senior Member Joined: August-06-2014 Location: IL/WI Status: Offline Points: 496 |
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ill have to gracefully bow out here. I have no clue with that setup. but im sure someone else does. I'm intrigued though. Is that like a coil for every two plugs?
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13511 |
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Yes. That goes in the garbage and a distributor gets installed.
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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Yeah it looks like that is exactly what it is after researching pro-tech ignition!!
Thanks a lot guys! i guess ill have to toss it. any suggestions on what distributor? id really like to not spend too much. |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13511 |
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well duh, not too many people do like to over spend but there are good better best options |
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5693 |
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Ebasic power shows a couple options in RH for distributors from 190-360 - you will also need a matching coil and maybe a ballast resistor depending on your choice. Don't throw away the gear on the bottom of that distributor type thingy yet until you find out if the RH options are actually available.
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13511 |
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I have no reason to believe his 94 Hydrodyne is not a LH engine.
Post up the engine model number. Starts with a P. There should be a black and white metal tag bolted on the top of the engine. |
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JoeinNY
Grand Poobah Joined: October-19-2005 Location: United States Status: Offline Points: 5693 |
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Definitely too many epoxy fumes over this way... there probably isn't such a thing as a RH protec in any boat
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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what i ment was the good option is probably all i need.
any reason why a used one on ebay would be a bad idea? |
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JPASS
Grand Poobah Joined: June-17-2013 Location: Orlando Status: Offline Points: 2283 |
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you're also going to need new wires as well. I'd say spend the money and get a whole new set-up (wires, dizzy, and coil). Don't waste time with used stuff from eBay.
It should cost less than $500 if you install it yourself. Skidim has a replacement kit Here We also get a discount for being a CCFan member. Should help with the cost. |
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'92 Correctcraft Ski Nautique
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21115 |
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Randy in ohio could probably tell us... Pretty sure he has a RH 1:1 proboss/protec in his '93 Sport. |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13511 |
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Did Mullin's RH scrappy come with ProTec? I know he changed distributors after ownership.
I'm guessing the 240hp RH engines got distributors [QUOTE=SneakyPete">I have a 93 Ski Nautique Standard with a RH 351 and the 1:1 tranny. It does not have a protec. |
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Hollywood
Moderator Group Joined: February-04-2004 Location: Twin Lakes, WI Status: Offline Points: 13511 |
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Randy has a distributor.
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Bri892001
Grand Poobah Joined: September-27-2008 Location: Boston MA Status: Offline Points: 4945 |
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Nope, mine came with a two wire Prestolite Electronic distributor.
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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happened found a guy parting out a 1993 pcm in my area on craigslist!! the whole shebang for $100! that should work right?
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TRBenj
Grand Poobah Joined: June-29-2005 Location: NWCT Status: Offline Points: 21115 |
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Probably not. It'll either have the same problematic ignition system or one with a gear meant for an engine with the opposite rotation as yours. Most likely the former, in which case I wouldn't pay $5 for it.
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camron18
Senior Member Joined: March-05-2015 Location: Michigan Status: Offline Points: 164 |
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It is not the protec system, and it is left handed, same as mine. Normal distributor with coil and ballast resistor plug wires and wiring harness
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shierh
Gold Member Joined: April-29-2015 Location: Florida Status: Offline Points: 605 |
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Also sounds like water in the gas. would rule that out as well.
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xarmypilot
Groupie Joined: March-25-2015 Location: Westfield, IN Status: Offline Points: 97 |
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It's worth looking into, but since it sounds like it runs normally at idle and there's no indication of white smoke, I'd say the likely culprits would be ignition, fuel or fuel\air mixture. |
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'87 SN 2001
'68 Chris~Craft Grand Prix (Past family boat) '72 Checkmate Mx16 (Past family boat) "Speed is life, altitude is life insurance" |
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