CatawbaRinker
Cadet
- Joined
- Jun 11, 2017
- Messages
- 28
Long story short, last season I had to have a rebuilt engine installed in my boat, original engine is a 1994 5.7L Bravo TBI, serial # OF286058. The boat is a 1995 Rinker Fiesta Vee 265 located in Marblehead, OH. The mechanic spent days tracking down why the boat wouldn't fire once the rebuilt engine was installed. Finally we were able to find that the IAC and ICM harnesses were switched. I get the boat boat, fires right up but for the life of me I could not get it above 3600 RPM and there was no power. Timing would advance to about 16. I have done the Mercruiser timing procedure several times to make sure that BTDC was set to 8 while in service mode. After several weeks of messing with timing, replacing injectors I came across the issue that the mechanic swapped out all of my old sensors (ICM, MAP, IAC, distributor coil) with automotive aftermarket parts in his quest to try and figure out why the boat wouldn't fire.
At the time I was unable to get ahold of him for my old sensors but noticed the boat was now throwing a code 42. The manual specs a Mercruiser 8M6008208 as the ICM but I was able to get a Sierra 18-5107-1 the same day and based on the reviews it appeared to be a pretty safe bet. I popped it in and instantly my RPM's went up to 4,200 and timing was advancing to 26. So it is about 90% there as the engine cover states max WOT to be 4400-4800.
I guess my question is would it be safe to assume that the actual Mercruiser ICM might be able to push it into that range? The boat still feels slightly sluggish and I've read (but have not confirmed) that timing should be advancing to around 30. Or are there any of the other sensors that might be causing an issue at this point?
At the time I was unable to get ahold of him for my old sensors but noticed the boat was now throwing a code 42. The manual specs a Mercruiser 8M6008208 as the ICM but I was able to get a Sierra 18-5107-1 the same day and based on the reviews it appeared to be a pretty safe bet. I popped it in and instantly my RPM's went up to 4,200 and timing was advancing to 26. So it is about 90% there as the engine cover states max WOT to be 4400-4800.
I guess my question is would it be safe to assume that the actual Mercruiser ICM might be able to push it into that range? The boat still feels slightly sluggish and I've read (but have not confirmed) that timing should be advancing to around 30. Or are there any of the other sensors that might be causing an issue at this point?
