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Intermittent alarm. no trend. temp good, oil pressure good,

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Intermittent alarm. no...

Intermittent alarm. no trend. temp good, oil pressure good, lanyard good. running along and it just beeps and engine jerks then picks right back up and runs. feels like electrical miss.

Mechanic's Assistant: Sometimes things that you think will be really complicated end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so the Marine Mechanic can help you best.

Only does it during running in lake.

Submitted: 4 months ago.Category: Boat
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Answered in 1 minute by:
12/14/2017
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 16,758
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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Hello my name is ***** ***** am I speaking with? I read what you wrote but I do not see any kind of model information. What engine are you asking about specifically?

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Customer reply replied 4 months ago
60HP ELPT EFI 2005
Customer reply replied 4 months ago
Do you want to call me?
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

Is this a Mercury or something else?

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Customer reply replied 4 months ago
Mercruy outboard.
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

There isn't anything that can be done to the engine without using a scan tool and seeing what is causing the beep. Did you have any questions that I could help you with?

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Customer reply replied 4 months ago
There are no codes. The engine runs along fine then it just jerks like it is losing ignition. My guys said they saw a TPS code once. However, they cleared it and it never came back.
We are a service shop and this one is kicking my techs in the teeth.
Will you be able to help?
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

When you say there are no codes, what scan tool are you using on the engine?

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Customer reply replied 4 months ago
laptop: using Diacom program.
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

I have diacom as well. Is there any chance you can take a recording with the alarm going off and send it to me so I can review it?

Next, and this is the million dollar question. What is happening first?

1. Is the engine dropping power first, and then beeping 2nd?

Or

2. is the engine beeping first, and then dropping power 2nd?

The reason I ask is because if it beeps first and then drops power, that is an EFI issue. If it drops power first, and then beeps, the reason it's beeping is because of the sudden drop in oil pressure that happens when the engine misfires. (And you would be getting codes for low oil pressure). Can you say for certain which one it is doing?

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Customer reply replied 4 months ago
It happens simultaneously and hard to say which is first because it happens in an instant. They did say that when it stayed in reduction mode for approx 30 sec is when it threw a TPS code. Maybe it is the TPS failing?
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

It's possible. Did you test the TPS with Diacom hooked up to see if it was functioning properly? Did you give the wiring harness between the TPS and ECM a wiggle test?

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Customer reply replied 4 months ago
we tested it while hooked to Diacom, it was functioning properly throughout throttle range. We wiggled every wiring harness and harness plug on the engine and boat, After seeing TPS code we paid extra attention to wire harness between TPS and ECM. We cleared TPS code and it came back but not when the quick drop out happened, only when engine went to full limp mode for @ 30 sec
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

T​ake a live recording with your Diacom when the alarm is going off and the engine is in limp mode and then send me a copy of it, i'll take a look and see if anything stands out.

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Customer reply replied 4 months ago
Ok, it will have to be tomorrow. It only went to full limp mode 2 times after many laps around the lake, but I'll give it a try tomorrow and get back with you. Thank you for your help.
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

N​o problem, there are no time limits here. Just send me a recording once you have been able to duplicate the problem, and when the alarm is sounding, and we will take it from there.

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Customer reply replied 4 months ago
HEY JASON I'M BACK. I TRIED TO GET YOU A RUN FILE ON THIS MOTOR BUT I LOSE COMMUNICATION WITH THE ECM AS SOON AS IT ALARMS AND GOES INTO LIMP MODE. DOES THIS POSSIBLY INDICATE AN ECM ISSUE CAUSING THIS PROBLEM.
Marine Mechanic: Jason, Marine Mechanic replied 4 months ago

It's really impossible to say. I don't want you buying a new ECM on my recommendation and have it end up not being the problem.

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