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2007 Ski Nautique (206 - open bow)
5.7L PCM GM Vortec
625 total hours (150+ this summer)
We are in Maine - ski hard May - Oct - 150 hours this summer
Issue:
DIED after planing out! Warmed it up for 5-10 min while shuffling ski gear. Putted 2 minutes out of cove into open water. Plained boat out and it died. Paddled back for 30 minutes with 2 water skis.
Boat is meticulously maintained. Wires, plugs, cap, rotor, fuel filters, oil, marine stable, impeller...all done when they are supposed to and regularly. Like many of you, she is well maintained.
Before hauling out of water I checked the following: kill switch, spark, fuel pressure, fuel cell and filter, small inline fuel filter, plugs, wires, cap and rotor. Plugs, cap and rotor and a new coil were all less than 30 hours old. The boat had no issues ever until the cam position sensor went about 25 hours ago. That was replaced. I replaced the coil when I was trying to diagnose the cam position sensor issue which was professionally diagnosed by throwing the relevant code.
Mechanic (at a Nautique dealer) His Notes: "scanned the computer and found no codes and no sensors that show any readings that are out of parameters. I have changed the crank position sensor, cam position sensor and ignition coil and driver as well as the ECM with good known parts off of an engine in the shop. I have checked compression and that appears to be ok, I have also changed the distributor gear as it showed some pretty decent signs of wear. At this point in time it looks like there may be an internal issue with the motor probably leaning towards the camshaft but i would have to dig a little deeper to be sure."
"The motor is acting like it is being told when to inject fuel and fire at the wrong time, hence me thinking it could be a camshaft issue, which could also be a timing chain or gear issue or it could be the woodruff key on the crank that holds the bottom gear or the reluctor wheel on the crank for the crankshaft sensor. Basically I will need to dig into the motor and see if I can pin point it with going in as little as possible. The first thing that I would like to do is pop the exhaust and take the valve covers off, this will give me a good idea if the camshaft is doing what it is supposed to be doing on all cylinders. If that all looks ok then we will have to dig further and the next step would be remove the front drive accessories see if we can get the timing chain cover off. A lot of the time the motor has to be pulled due to the fact that the cover has a lip that sits inside of the oil pan and usually cant be removed without taking the pan off. "
Thoughts?!?!?
Here are 2 vids of trying to start it:
https://youtu.be/jYGKh-ha0bg
https://youtu.be/WyRo_gzty48
Since we are in Maine they are doing 500 winterizations and won't be able to look into my boat until December. It's killing me to store it broken.
Thoughts?!?!? Suggestions.
Thank you for your time.
5.7L PCM GM Vortec
625 total hours (150+ this summer)
We are in Maine - ski hard May - Oct - 150 hours this summer
Issue:
DIED after planing out! Warmed it up for 5-10 min while shuffling ski gear. Putted 2 minutes out of cove into open water. Plained boat out and it died. Paddled back for 30 minutes with 2 water skis.
Boat is meticulously maintained. Wires, plugs, cap, rotor, fuel filters, oil, marine stable, impeller...all done when they are supposed to and regularly. Like many of you, she is well maintained.
Before hauling out of water I checked the following: kill switch, spark, fuel pressure, fuel cell and filter, small inline fuel filter, plugs, wires, cap and rotor. Plugs, cap and rotor and a new coil were all less than 30 hours old. The boat had no issues ever until the cam position sensor went about 25 hours ago. That was replaced. I replaced the coil when I was trying to diagnose the cam position sensor issue which was professionally diagnosed by throwing the relevant code.
Mechanic (at a Nautique dealer) His Notes: "scanned the computer and found no codes and no sensors that show any readings that are out of parameters. I have changed the crank position sensor, cam position sensor and ignition coil and driver as well as the ECM with good known parts off of an engine in the shop. I have checked compression and that appears to be ok, I have also changed the distributor gear as it showed some pretty decent signs of wear. At this point in time it looks like there may be an internal issue with the motor probably leaning towards the camshaft but i would have to dig a little deeper to be sure."
"The motor is acting like it is being told when to inject fuel and fire at the wrong time, hence me thinking it could be a camshaft issue, which could also be a timing chain or gear issue or it could be the woodruff key on the crank that holds the bottom gear or the reluctor wheel on the crank for the crankshaft sensor. Basically I will need to dig into the motor and see if I can pin point it with going in as little as possible. The first thing that I would like to do is pop the exhaust and take the valve covers off, this will give me a good idea if the camshaft is doing what it is supposed to be doing on all cylinders. If that all looks ok then we will have to dig further and the next step would be remove the front drive accessories see if we can get the timing chain cover off. A lot of the time the motor has to be pulled due to the fact that the cover has a lip that sits inside of the oil pan and usually cant be removed without taking the pan off. "
Thoughts?!?!?
Here are 2 vids of trying to start it:
https://youtu.be/jYGKh-ha0bg
https://youtu.be/WyRo_gzty48
Since we are in Maine they are doing 500 winterizations and won't be able to look into my boat until December. It's killing me to store it broken.
Thoughts?!?!? Suggestions.
Thank you for your time.
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