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I have a 7.4 MPI serial # OL395632. When the ignition is turned…

Customer Question
I have a 7.4 MPI...
I have a 7.4 MPI serial # XXXXX When the ignition is turned on the engine alarm give 2 flashes before starting, as normal. Sometimes after running for a while the alarm goes off with the same 2 flashes, not constant. All my gauges are running in normal operating zones. What else can I look for in order to diagnose this problem?
I would consider getting diagnostic software and an adapter for my laptop to check for any engine codes. What is recomended and where can it be purchased, if you think this would help?
Submitted: 8 years ago.Category: Boat
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Answered in 43 minutes by:
6/29/2010
Marine Mechanic: Ted G., Rigger, Diagnostician replied 8 years ago
Ted G.
Ted G., Rigger, Diagnostician
Category: Boat
Satisfied Customers: 6,226
Experience: 40 years boating, Safe boating instruct., Offshore Race promoter, Failure Analysis, Expert Witness
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You need to have your engine scanned for trouble codes. Apparently your builder did not hook up your beeper because you should be getting 2 beeps instead of flashes, but that is a warning that the computer sees something wrong and should have a code set. If you would like to buy a diag cable and program look at the one from Mefi Burn

http://www.mefi4.com/sc/details.asp?item=mefiscan1

I am pretty sure you need their mefiscan 3 but if you call them they are very helpful. I use the Rinda program Diacom which is great but frankly more money (they developed the scanners and programs for Mercury)

http://www.rinda.com/marine/marine.htm
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Customer reply replied 8 years ago

Hi Ted,

Sorry it has taken me so long to reply. I just got the mefiscan 3 working on the laptop and connected to the engine. I connected an ran the engine while logging. I don't see anything that tells me what may be the trouble. Some more history; the engine light went on after the boat would be run for a short while (15 min) but only while under way. I did change the oil and checked some connections and the light did not show up for a couple weekends, with a trips that lasted 30-45 mins. Then a run of about the same leangth, I had the light go on during the return trip. Again, I have been checking connections, all of which all seem fine. Then over the long weekend, I made a trip that was 2 hours and 45 mins out, cruising at 3300 - 3500 RPM. The trip back was 2 hours, cruising at 3500 - 3800 RPM. The alarm never went off.

Can you be specific on what paramiters I should be checking?

Kevin

Marine Mechanic: Ted G., Rigger, Diagnostician replied 8 years ago
Look at IAC counts after warm, what is it running?

Edited by Ted G. on 7/7/2010 at 2:44 PM EST
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Customer reply replied 8 years ago

Here it is;

00 IAC Base Pos

104 IAC Actual Pos

00 IAC Desired Pos

600 IAC Desired RPM

09 IAC TPS Follower

2.94 Coolant Sensor Voltage

1236 RPM

 

I added the last two items due to the "Desired RPM" and the fact that I don't think the engine was completly warmed up. If need be I can run a scan again after ensuring the engine is completly up to temp.

 

Let me know what you thinK?

 

Thanks
Kevin

Marine Mechanic: Ted G., Rigger, Diagnostician replied 8 years ago
I'm pretty sure that your IAC is sticking since the counts are so far off desired, It is a cheap fix and that is where I would start.
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