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Old 11-02-2016, 07:29 PM   #1
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Default Alarm sounding and engine missing

Hi all,

I have a 2002 2900 SCR with a 6.2 and Bravo 3 and the week before pulling her out of the water, she would get up to around 4k rpm and begin to miss severely and the warning alarm would begin to sound. Earlier this summer I replaced plugs, wires, cap and rotor because of a misfire then also. That time however, the alarm did not sound.

My thought is that it may be fuel related which is causing a misfire. Can anyone tell me if the ECM will sound the alarm for severe misfire condition?

Thanks in advance for any feedback!
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Old 11-02-2016, 10:46 PM   #2
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Being that the alarm is sounding I would think its electrical such as a bad senser. Have the codes read is the best way to attack this issue.
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Old 11-02-2016, 10:52 PM   #3
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Quote:
Originally Posted by mmwjr View Post
Being that the alarm is sounding I would think its electrical such as a bad senser. Have the codes read is the best way to attack this issue.
Probably good advice. I always thought that the alarm was only tied to temp. oil pressure and drive lube. Didn't know it would sound for other engine issues.

Any idea what type of scan tool is needed for mercruiser?
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Old 11-03-2016, 02:26 AM   #4
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The carb engines only have the three sensors but MPI has all the engine sensors like a car. Try rinda for the scan tool or have a mechanic do it.


Rinda Technologies marine diagnostic tools, marine diagnostics, marine scan tools, marine engine software
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Old 11-03-2016, 02:31 PM   #5
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Scan Tool: $499
Scan Software: Standard $579.00/ Deluxe: $1,029.00
Connector: $50.00

It would cost you a fraction of that to hire a certified mercruiser mechanic to read the codes for you (approx. $125 - $150/hour. Probably one hour of work).

This is not cost effective to buy this yourself.

Were any of these issues occurring prior to the tune-up? I'd start there.
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Old 11-07-2016, 07:14 PM   #6
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Quote:
Originally Posted by shrew View Post
Scan Tool: $499
Scan Software: Standard $579.00/ Deluxe: $1,029.00
Connector: $50.00

It would cost you a fraction of that to hire a certified mercruiser mechanic to read the codes for you (approx. $125 - $150/hour. Probably one hour of work).

This is not cost effective to buy this yourself.

Were any of these issues occurring prior to the tune-up? I'd start there.
Hey Shrew,

Thanks for the response. It was misfiring originally and that was the reason for the tuneup. However, it was not sounding the alarm at that point. I did not pull any plugs to see if they were fouled but that is the next step.

I guess what was curious to me was the alarm sounding along with the misfire. I was not sure if the alarm would actually sound for a misfire condition.
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