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Suzuki 150 running rough under load

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Suzuki 150 running rough under load

Old 09-13-2019, 06:43 PM
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Default Suzuki 150 running rough under load

i have a new Suzuki 150 with 21 hrs on it. It has run fine since new. I did the 20 hr service on it last weekend and was able to get it on the water today. Idled out from the ramp and brought it up on plane and ran it with no issue to our first fishing spot. Trolled for about 20 minutes and stopped and fished about 45 minutes. Started the motor and got the boat on plane again but after about 100 yards the mortor started to blog down and run rough. Trolled it for awhile as I headed back to the ramp with no issues, tried to bring it up on plane again but it started to bog down and run tough. If I put the throttle in neutral and rev the engine it will do the same thing.

bringing in to have it looked at on Tuesday, the dealer said it sounds like it’s going into safe mode. Any thoughts?
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Old 09-13-2019, 06:53 PM
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Originally Posted by Jaybord View Post
i have a new Suzuki 150 with 21 hrs on it. It has run fine since new. I did the 20 hr service on it last weekend and was able to get it on the water today. Idled out from the ramp and brought it up on plane and ran it with no issue to out to our first fishing spot. Trolled for about 20 minutes and stopped a fished about 45 minutes. Started the motor and got the boat on plane again but after about 100 yards the mortor started to blog down and run rough. Trolled it for awhile as I headed back to the ramp with no issues, tried to bring it up on plane again but it started to bog down and run tough. If I put the throttle in neutral and rev the engine it will do the same thing.

bringing in to have it looked at on Tuesday, the dealer said it sounds like it’s going into safe mode. Any thoughts?
Your right to let the dealer look at it, we had a similar situation on an old merc turn out the fuel line had a kink in it....When trimmed up the fuel loop and when trimmed down and turned hard left a kink, took several weeks to figure it out very frustrating.
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Old 09-14-2019, 01:25 PM
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Anyone having similar issues with Yamaha or Merc?

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Old 09-14-2019, 03:30 PM
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Originally Posted by Jaybord View Post
i have a new Suzuki 150 with 21 hrs on it. It has run fine since new. I did the 20 hr service on it last weekend and was able to get it on the water today. Idled out from the ramp and brought it up on plane and ran it with no issue to our first fishing spot. Trolled for about 20 minutes and stopped and fished about 45 minutes. Started the motor and got the boat on plane again but after about 100 yards the mortor started to blog down and run rough. Trolled it for awhile as I headed back to the ramp with no issues, tried to bring it up on plane again but it started to bog down and run tough. If I put the throttle in neutral and rev the engine it will do the same thing.

bringing in to have it looked at on Tuesday, the dealer said it sounds like it’s going into safe mode. Any thoughts?
sounds fuel related.
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Old 09-14-2019, 03:31 PM
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Water in fuel would be my guess....drain vst and see
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Old 09-14-2019, 03:40 PM
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You say it does the same thing in neutral?

When it is neutral, the engine will not rev beyond about 3000rpm to protect it from damage. It does that by restricting spark advance, fuel supply etc. it is like a race car with the pit lane limiter activated. It will spit and cough and run really bad on the limiter. There is a neutral throttle switch on the linkages in the engine that controls this.

If that switch fails, or is dislodged from its proper alignment, or its plug to the ecu is not connected properly, then when the engine is put into gear, the ecu does not receive the signal that it is in gear and the neutral limit will still be active. That is not a safe mode, it is simply a neutral rev limit mode.
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Old 09-14-2019, 06:59 PM
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Moonlighter, where would I look for that switch and plug? I put fresh fuel in the night before (non ethanol) and the fuel water separator is clear, so I don’t believe it is fuel related.
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Old 09-14-2019, 08:12 PM
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Take the cowl off.

Starboard side of engine. Where gear cables move the linkages. It plugs into the harness.

part #5 on this page
https://www.boats.net/catalog/suzuki...f150at-df150az

If that is what it is, the dealer will diagnose easily and fix it in 30 minutes.

Are you sure that you havent simply dislodged a spark plug lead during the service? These engines will seem to run smooth at idle on 3 cyl but as soon as you get some load on ..... it might have been attached at first but fell off during the day’s fishing?



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Last edited by Moonlighter475; 09-14-2019 at 08:19 PM.
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Old 09-15-2019, 03:57 AM
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Thank you Moonlighter, I will check these items this afternoon. I very well could have knocked something loose, that cowling is pretty bulky and taking it on and off things do get bumped.

Ill report back. I also posted this on the Suzuki owners forum, I noticed last night as I was reading through various posts that you are a member there too.
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Old 09-15-2019, 01:53 PM
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Checked all the connectors, every thing appears to be normal, leads to the spark plugs appear to be good. Looks like we’ll have to wait for the Suzuki dealer to look at it on Tuesday. I’m stumped.
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Old 09-16-2019, 05:48 PM
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Taking the boat to the Suzuki dealer tomorrow morning, I’ll post a follow up on this.

in the meantime, I hooked the motor up to the hose and cranked it up and let it idle for a minute. I then put it in neutral and brought the motor up to 2500 rpm, no misses or rough running. The fuel ball remained filled. I did notice that there was an intermittent stream coming from the pilot hole while under load.

i think the problem is the motor is over heating, the motor was cold when I ran it tonight, and it was cold when I first went out the other day, it didn’t start acting up until I had ran it a distance. I will let you all know what the dealer says.
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Old 09-16-2019, 11:55 PM
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If it was overheating you should definitely have been getting an alarm plus warning codes/messages on your gauges.

The dealer should hook it up to SDS to check codes. If it shows temp codes I would ask why no codes or alarms happened!
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Old Yesterday, 04:10 AM
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Originally Posted by Moonlighter475 View Post
If it was overheating you should definitely have been getting an alarm plus warning codes/messages on your gauges.

The dealer should hook it up to SDS to check codes. If it shows temp codes I would ask why no codes or alarms happened!
i agree.
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Old Yesterday, 05:07 AM
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I have a 115 suzuki that had similar issues. Checked all the fuel issues and found nothing pulled spark plugs and didn’t see any apparent problem with those but put new set in anyway and that fixed my issue . Engine was just over the 20 hour mark also. My boat sits on lift and if I left motor down it would woof smoke when I started it . Seen post that said trim motor a bit when shut down and that took care of the smoke issue ,guess the oil getting on the plugs got to them .
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Old Yesterday, 05:46 AM
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Originally Posted by Jaybord View Post
Anyone having similar issues with Yamaha or Merc?

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Not with my Merc
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Old Yesterday, 06:52 AM
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Originally Posted by Jaybord View Post
Anyone having similar issues with Yamaha or Merc?

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Yes, that's why they all come with a warranty.
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