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Another DF350 issue

Old 12-27-2020, 06:27 PM
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Default Another DF350 issue

were offshore today, struck out on wahoo but cleaned up the bottom. We start heading in and the starboard motor is losing RPM's and doesn't sound right. We are still 40 miles offshore, so that sucked. We slowed it down and made it in. The starboard motor was buring a lot more fuel and just couldn't keep up with the port. I disabled the sync as that was screwing with the port and the starboard just ran poorly.

When we got into the river I ran the boat WOT to see what the issue was. Normally I could hit 6200rpm with no issue. You can see below the port was at 6000 and the starboard at 5500. Obviously the port was lower due to drag, but the starboard!

The dealer is on leave till Jan 4th, so the question is can this be simple or not? There are no codes, all fuel filters were changed 40 hours ago. Spark plugs changed 40 hours ago. Motor was not starving for fuel, almost felt like not all cylinders were firing.

I have about had it with these motors, but I need a little more time to save the cash to repower. Thoughts to get me fishing this week?

this photo normal speed but sucking fuel






This Photo WOT

Last edited by datlhookYa; 12-28-2020 at 05:34 PM.

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01-04-2021, 03:26 PM
datlhookYa
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Originally Posted by alloyboy View Post
Uh oh. Here we go!
No sir. I've come to terms with the reality. My dealer is solid like a granite mountain. They told me that they are on it and will make it right. The motor may have severe deficiency but my dealer is making up for it. Am I sad, sure. The beauty is if I work a bit harder I can get a repower. This is life. Been through cancer three times. I'll make it through this.
Old 12-27-2020, 06:32 PM
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I am not a mechanic, so no input of any value. Suzuki should buy them back from you for all the pain you been thru.
Old 12-27-2020, 08:29 PM
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Oxygen Sensor?
Old 12-27-2020, 08:57 PM
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Easy stuff you can do is swap spark plugs and coils from engine to engine. Compression test after that.

Seems like she is down a hole.

Doing those two things are simple and can’t hurt anything.
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Old 12-28-2020, 04:42 AM
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Originally Posted by Greene Machine View Post
I am not a mechanic, so no input of any value. Suzuki should buy them back from you for all the pain you been thru.

Yup.



OP, I am no mechanic either, but I would pull the plugs on that engine first. I am guessing one of them is not going to look like the others. I would also replace them, regardless of how they look.


Good luck.
Old 12-28-2020, 04:53 AM
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Originally Posted by Capt. Fred View Post
Yup.



OP, I am no mechanic either, but I would pull the plugs on that engine first. I am guessing one of them is not going to look like the others. I would also replace them, regardless of how they look.


Good luck.
10-4.

My 2014 mustang with 249k miles had a recent spark plug issue. Check engine light came on. Code said cylinder 7. Replaced plug still an issue so replaced the coil pack, problem solved. Do outboards not show codes for something similar?
Old 12-28-2020, 02:06 PM
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I had 6 plugs from the 100 hour change I saved. Placed them in and same issue. Swapped the coil packs, same issue.

There was one plug that was different, thoughts?

Old 12-28-2020, 02:10 PM
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Looks like salt and too clean. Maybe getting cooling water in the combustion chamber. I think another member had an issue with cracked heads on the DF350? Possible head gasket if not cracked head?
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Old 12-28-2020, 02:35 PM
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Originally Posted by captbone View Post
Looks like salt and too clean. Maybe getting cooling water in the combustion chamber. I think another member had an issue with cracked heads on the DF350? Possible head gasket if not cracked head?

Great...... :-(

After a 7 week time in the shop from Oct to Nov waiting on a new lower unit because it went to $hit on the port motor, 2 trips out and now this.
Old 12-28-2020, 03:06 PM
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Damn, sorry for all of the hassle. I can’t offer anything but to offer you luck on getting those engines working for you on that wonderful boat.
Old 12-28-2020, 03:23 PM
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Do a compression test.
Old 12-28-2020, 09:44 PM
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Test that cylinder first. What octane fuel do you run?
Old 12-29-2020, 04:25 AM
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Crap. That does look like salt. Good question on the code. You would think a cracked head would cause a serious enough issue for the computer to notice something is amiss.

Is there any evidence of water in the oil?

I hate to say it but it might be time to bring it back to the dealer..... again.
Old 12-29-2020, 04:51 AM
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Leakdown may be more informative, especially if the motor is cold. Compression may not be different enough from the other holes to determine if the head is cracked. Leakdown should show up well.

OR run the motor hopefully until it gets good and warm. Then pull the plug on that hole and get someone to spin the motor over while you are watching the plug hole to see if water comes out.

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Old 12-29-2020, 05:18 AM
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At this point I did all the diagnosis I could do with the tools I have. The dealership is closed until January 4th for a much-needed holiday break. The guys over there work real hard and I have no issue with that. They honestly treat me like a king when I bring the boat in.

On Monday I'll bring the boat back to them. I did send an email to give them a heads up I'm bringing it in and the service manager seemed just as frustrated as I am. He apologized for the headache and said we'll diagnose it quickly and try to get me back on the water fast.

I checked the oil and it was normal level on the dipstick. Also the oil on the dipstick did not have any kind of milky appearance.

Thanks to everyone for the initial diagnosis. Time will tell what really is going on.

Last edited by datlhookYa; 12-29-2020 at 08:02 AM.
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Old 12-29-2020, 05:54 PM
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I have seen the cracked head problem. It would have water in the oil, and if it had water entering the cylinder that spark plug would clean as a whistle. That spark plug looks pretty normal to me, maybe a little lean. The DF350 has two injectors per cylinder, I wonder if some injectors are not working properly. But if that was the case I would think it would be running rough.
How many hours on the motors? 700 hours is about the time frame the crack head problem shows up.
Old 12-29-2020, 06:07 PM
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Double post
Old 12-29-2020, 06:09 PM
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Originally Posted by cold beers View Post
I have seen the cracked head problem. It would have water in the oil, and if it had water entering the cylinder that spark plug would clean as a whistle. That spark plug looks pretty normal to me, maybe a little lean. The DF350 has two injectors per cylinder, I wonder if some injectors are not working properly. But if that was the case I would think it would be running rough.
How many hours on the motors? 700 hours is about the time frame the crack head problem shows up.
The other 5 plugs looked very normal. This one wasn't even close looking to the others. I'm no expert on reading the plug, so I'll leave that to the pros here. The others were smooth and black. Very little residue. This one was brown with all those bubbles.

We have close to 500 hours. Would have more, but can't keep these damn things out of repair. They are literally breaking down every 2-3 trips.

Motor was not running rough, oddly enough. At idle sounds normal. Up to 3500rpm sounds normal. As you hit closer to 4000rpm you notice it's struggling and starts to sound different.



Old 12-30-2020, 04:35 AM
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Originally Posted by datlhookYa View Post
At this point I did all the diagnosis I could do with the tools I have. The dealership is closed until January 4th for a much-needed holiday break. The guys over there work real hard and I have no issue with that. They honestly treat me like a king when I bring the boat in.

On Monday I'll bring the boat back to them. I did send an email to give them a heads up I'm bringing it in and the service manager seemed just as frustrated as I am. He apologized for the headache and said we'll diagnose it quickly and try to get me back on the water fast.

I checked the oil and it was normal level on the dipstick. Also the oil on the dipstick did not have any kind of milky appearance.

Thanks to everyone for the initial diagnosis. Time will tell what really is going on.
Man I feel for you . That sucks that this is continuously happening to you. It's impossible to have any confidence in those motors going that far offshore. I know everyone on here quickly recommends an attorney to resolve an issue, but I think in your case this warrants one for sure. I would expect nothing less than a full buy back plus calculated time missed and aggravation.
Old 12-30-2020, 04:36 AM
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Then...............You need to slap some of those new white Merc V8's on!!!!
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