(2007 Bayliner Discovery 192 3.0 (1AOO5789) HI USHB24EYH607)
So I?m having what I believe is an ignition breakdown. Here?s a little of the history of the boat and what we have done. (maybe more than you'd like to see LOL)
The boat (2007 Discovery 192 with 135 hours on the meter) when we bought it from the PO it ran fine, a bit hard to start but not really alarming (learning curve for the 3.0 TKS 2 BBL system), good hole shot to planning (light load), top speed and WOT RPMs about 4200 last January.
Fast forward to April when we moored the boat at a nearby marina. We began to have a problem starting and with getting the boat on plane or poor performance under a load. After running the boat for about 15 minutes we would begin to feel a loss of power at 3500 RPMs. We would slow the boat down and let it idle for a bit. After that the motor would accelerate to about 3K rpm (a bit rough running from about 1500-2500 RPMs) and have no more to offer, the boat would be short of planning out. At idle the boat is pretty normal, you can putt around all day with no problems, rev in neutral no problem, just could not get it on a pane under a load on the motor after reaching running temps (175 degrees).
I believed it was a tune up issue first, I replaced the rotor, cap, spark plug wires, spark plugs (NKG?s), fuel filters, set the timing (after putting the distributor in base mode, 2 degrees ATDC) and added seafoam to the fuel tank each fill up. Surprisingly the performance did not improve as much as I would have expected (the tune up was overdue by looking at the parts I replaced). I felt I was having issues with the fuel delivery so I replaced the 2 BBL TKS carb with a rebuilt carb. Same issue, no power.
On a closer looks at the ignition we noticed that the timing was not advancing as the rpms were increased indicating the ignition module was not performing properly (maximum advance at 3K was 14 degrees). We replaced the module and now we could get to 4K RPMs on a plane. A bit later we were back to the not being able to plane out the boat for lack of power. On rechecking the timing advance it looks like we have another module failure (about 2 degrees over idle timing at 3K).
The prop was a 14.25X21? pitch which seemed like a bit too much for the size of our boat and motor package. We got a 14.5X17? 4 blade prop and installed a new module and shazaaammm! The boat ran gangbusters! About 4500 RPM WOT, good hole shot, and able to plane out with a full load of five adults on the boat. We ran the boat for the better part of the day with it performing as it should.
A week later took the boat and started to head up to the San Jauns. About two hours into the trip we were back to not being able to plane out, no power 3000 rpms max (weak performance).
We have run (fresh) marina grade boat gas in our boat for the last 50 hours, close to 100 gals I would guess. The TKS fuel enrichment system works like it should, raising the rpms on a cold start for about 8 minutes before slowing down to a normal idle rpm.
After returning home the next week we were getting a bit frustrated so we put the boat in nearly full throttle (3000 RPMS weak) trying to plane it out and tried squirting some fuel down the carb to see if the motor is starving for fuel. When I gave the cab a squirt of fuel it made the motor actually slow down and stumble worse a bit so odds are that fuel is not the issue (we could not make it up on a plane). Back to looking at the ignition and spark delivery.
I ordered a new coil, mine is so hot after running for about 20 minutes it?s uncomfortable to put my hand on it. I?m also looking at the pickup coil in the distributor with a suspicious eye.
Am I missing something here? If I had a valve, ring or compression issue it would be consistently running bad no matter what I changed in the ignition or the fuel delivery. Why would the boat run so good for a day and a half then loose power again?
I?m hoping the coil is the problem but am I missing something? The new coil should be her next week, my fingers are crossed.
Mike
So I?m having what I believe is an ignition breakdown. Here?s a little of the history of the boat and what we have done. (maybe more than you'd like to see LOL)
The boat (2007 Discovery 192 with 135 hours on the meter) when we bought it from the PO it ran fine, a bit hard to start but not really alarming (learning curve for the 3.0 TKS 2 BBL system), good hole shot to planning (light load), top speed and WOT RPMs about 4200 last January.
Fast forward to April when we moored the boat at a nearby marina. We began to have a problem starting and with getting the boat on plane or poor performance under a load. After running the boat for about 15 minutes we would begin to feel a loss of power at 3500 RPMs. We would slow the boat down and let it idle for a bit. After that the motor would accelerate to about 3K rpm (a bit rough running from about 1500-2500 RPMs) and have no more to offer, the boat would be short of planning out. At idle the boat is pretty normal, you can putt around all day with no problems, rev in neutral no problem, just could not get it on a pane under a load on the motor after reaching running temps (175 degrees).
I believed it was a tune up issue first, I replaced the rotor, cap, spark plug wires, spark plugs (NKG?s), fuel filters, set the timing (after putting the distributor in base mode, 2 degrees ATDC) and added seafoam to the fuel tank each fill up. Surprisingly the performance did not improve as much as I would have expected (the tune up was overdue by looking at the parts I replaced). I felt I was having issues with the fuel delivery so I replaced the 2 BBL TKS carb with a rebuilt carb. Same issue, no power.
On a closer looks at the ignition we noticed that the timing was not advancing as the rpms were increased indicating the ignition module was not performing properly (maximum advance at 3K was 14 degrees). We replaced the module and now we could get to 4K RPMs on a plane. A bit later we were back to the not being able to plane out the boat for lack of power. On rechecking the timing advance it looks like we have another module failure (about 2 degrees over idle timing at 3K).
The prop was a 14.25X21? pitch which seemed like a bit too much for the size of our boat and motor package. We got a 14.5X17? 4 blade prop and installed a new module and shazaaammm! The boat ran gangbusters! About 4500 RPM WOT, good hole shot, and able to plane out with a full load of five adults on the boat. We ran the boat for the better part of the day with it performing as it should.
A week later took the boat and started to head up to the San Jauns. About two hours into the trip we were back to not being able to plane out, no power 3000 rpms max (weak performance).
We have run (fresh) marina grade boat gas in our boat for the last 50 hours, close to 100 gals I would guess. The TKS fuel enrichment system works like it should, raising the rpms on a cold start for about 8 minutes before slowing down to a normal idle rpm.
After returning home the next week we were getting a bit frustrated so we put the boat in nearly full throttle (3000 RPMS weak) trying to plane it out and tried squirting some fuel down the carb to see if the motor is starving for fuel. When I gave the cab a squirt of fuel it made the motor actually slow down and stumble worse a bit so odds are that fuel is not the issue (we could not make it up on a plane). Back to looking at the ignition and spark delivery.
I ordered a new coil, mine is so hot after running for about 20 minutes it?s uncomfortable to put my hand on it. I?m also looking at the pickup coil in the distributor with a suspicious eye.
Am I missing something here? If I had a valve, ring or compression issue it would be consistently running bad no matter what I changed in the ignition or the fuel delivery. Why would the boat run so good for a day and a half then loose power again?
I?m hoping the coil is the problem but am I missing something? The new coil should be her next week, my fingers are crossed.
Mike
