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Mercruiser 5.0 MPI Sluggish after Tune-up

 
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AJBeastro



Joined: 23 Jun 2010
Posts: 2

PostPosted: Wed Jun 23, 2010 12:59 pm    Post subject: Mercruiser 5.0 MPI Sluggish after Tune-up Reply with quote

I recently had a tune-up and bad IAC valve replaced by a local Glastron dealer on my 2005 SeaRay 200 Select with a 5.0 MPI engine. After getting the boat back on the water it seems very sluggish out of the hole and it wasn't like that before I brought it in even with the bad valve. Altogether, the IAC valve, rotor cap, fuel filter, oil filter, and spark plugs were replaced, as were all the fluids, and the timing belt was adjusted. The dealer tried to charge me an additional 15% over what was quoted and because they didn't order the parts needed for the tune-up when the boat was dropped off it set the repair back an additional 2 weeks. All of that caused quite a falling out between us so now I am afraid that the work was done wrong (either on purpose or not) and now I won't get any help from them. What I'm wondering is if it is normal for sluggishness to happen as a sort of new break-in period since there are many new ignition parts installed. I've only briefly driven the boat so far but I don't recall having this issue when it was brand new so I'm a bit worried that something wasn't done right with the repair and tune-up. Any help or suggestions would be appreciated.
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AJBeastro



Joined: 23 Jun 2010
Posts: 2

PostPosted: Thu Jun 24, 2010 7:00 am    Post subject: Reply with quote

I took a look at it last night and found out that there was no spark on wires 3 and 7 coming off the rotor cap. I replaced the "new" one with the one that was replaced and everything works great! Most of the corrosion on the old setup was on the rotor itself so I'm hoping that having the combination of the two will continue to work for a long time. Thanks for everyone who gave me some suggestions. I'm glad it's working now with minimal work done on my end but I can't believe that the mechanic didn't catch this. You could feel a slight shutter since two cylinders weren't firing not to mention that the exhaust didn't smell right with all that gas that wasn't burnt.
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