1998 SeaRay Sundancer 330 wont get on plane

I feel for ya. I spent countless hours and a ton of money trying to get mine up on plane. Get a good tech. Kiss the ring. Offer your first born and before you know it its all fixed
 
Jeff Delbuono said:
I feel for ya. I spent countless hours and a ton of money trying to get mine up on plane. Get a good tech. Kiss the ring. Offer your first born and before you know it its all fixed
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Funny and so true. I have spent many hours and numerous days on this problem and have just about almost exhausted everything but have never given up
 
My wife was like. Doing 8 knots is fine honey...... I would not give up till it was fixed. Your almost there. Just probably something stupid
 
Jeff Delbuono said:
My wife was like. Doing 8 knots is fine honey...... I would not give up till it was fixed. Your almost there. Just probably something stupid
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For sure something stupid. I have at least 26 years with General Motors dealerships and this is the first time something has kicked my butt that I have not been able to figure out in a short period of time.
 

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Mauro Palma said:
I will, I had a mercruiser tech with me because he had the scan tool to to set base timing. At that time we did confirm firing order and timing advance
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Your compression looks great. You have said earlier that the rev limiter kicks in at 3100. That makes no sense. If that is true, that is the problem. If I took my boat out and put it up to 3100 only I would guess it would take 30 seconds or more to get on plane, maybe more. The recommended WOT is 4200 to 4400. I use full throttle and full tabs down to get on plane and it comes up nicely, then back down to cruise RPM of 3400 (30mph). Are you sure your rev limiter is kicking in at 3100?
 
Creekwood said:
Your compression looks great. You have said earlier that the rev limiter kicks in at 3100. That makes no sense. If that is true, that is the problem. If I took my boat out and put it up to 3100 only I would guess it would take 30 seconds or more to get on plane, maybe more. The recommended WOT is 4200 to 4400. I use full throttle and full tabs down to get on plane and it comes up nicely, then back down to cruise RPM of 3400 (30mph). Are you sure your rev limiter is kicking in at 3100?
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The rev limit at 3100 rpm is in neutral at the dock, that is normal. When under load at wide open throttle the rpms do not make it past 2400 on each engine. These are L29 MPI engines
 
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scoflaw said:
I would not be comfortable with fuel lines that old. I'd take it a step at a time. Compression test first to determine the physical health of the engines first. Scan for codes next.
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Creekwood said:
Ok. Got it. Are you sure it has the right props?
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Yes. If you look at the stuff we had done. The prop shop reconditioned props and it came with a sheet which has the numbers after the reconditioning. I verified it against the OEM props in the parts manual
 

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I’d go to fuel next like scoflaw recommenced. Two external tanks plumbed directly into your spin on filters, that way you bypass the old lines.
 
Strecker25 said:
I’d go to fuel next like scoflaw recommenced. Two external tanks plumbed directly into your spin on filters, that way you bypass the old lines.
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That sounds like the next best thing, but from the spin on filter to the back of the fuel pump there is one line and from the fuel cooler to the fuel rail there is another line. line. I am thinking that at least bypass all the fuel lines and go directly to the inlet side of the fuel pump. Do you think that not having enough fuel flow would actually run well to the point of just not getting enough rpm and have no signs of bogging down?
 
Mauro Palma said:
That sounds like the next best thing, but from the spin on filter to the back of the fuel pump there is one line and from the fuel cooler to the fuel rail there is another line. line. I am thinking that at least bypass all the fuel lines and go directly to the inlet side of the fuel pump. Do you think that not having enough fuel flow would actually run well to the point of just not getting enough rpm and have no signs of bogging down?
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UPDATE: I replaced both Ignition modules and ignition pick up coils and reset timing. Max rpm now 3,000 and boat does
get on plane and tops out at 30 mph. It is much better but it should get to 4200-4600 for sure.
 
Mauro Palma said:
UPDATE: I replaced both Ignition modules and ignition pick up coils and reset timing. Max rpm now 3,000 and boat does
get on plane and tops out at 30 mph. It is much better but it should get to 4200-4600 for sure.
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AWESOME!. Must be quite a relief to get it sorted out. Still something else holding them back, but that's a great step forward.
 
This is where i started when i had the same problem. Mine was out of timing and the a-hole i asked to help woth a tune up put the wires in wrong place. Ran awesome at dock but would not get over 2800 rpm. Its a good guide
20200601_191639.jpg
 
Jeff is right in working systematically.
But related to overheating, the picture in post 34 shows gauge temperatures way higher than I saw with 5.0s. Are those normal temps for his engine?
 
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