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hi. i have twin 2005 mercury 4 stroke 225hp efis.when i run…

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hi. i have twin 2005...
hi. i have twin 2005 mercury 4 stroke 225hp efi's.when i run the engines on the water everything is fine for the first ten minutes and then i cant get my port engine to go above 2000 rpm's, when i try to get back to the marina on the starbord engine its runs fine at 4000 rpm's and the all of a sudden it jumps back and forth from 4000 to 2000 to 4000 to 2500. what the heck is going on. ive tried everything.the port engine has the injectors already repaired (1 new and the others overhauled), theres new fuel lines fuel pumps,filters, vst pumps, tune ups done already. have paid 3300 in repairs and still have the same problem. batteries are good. what could my problem be?PLEASE HELP!!!

the boat is a 2006 28 foot sea fox center console.
Submitted: 13 years ago.Category: Boat
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Answered in 6 hours by:
6/25/2009
Marine Mechanic: Mechman45, Marine Mechanic replied 13 years ago
Mechman45
Mechman45, Marine Mechanic
Category: Boat
Satisfied Customers: 254
Experience: 30 Year Service Tech Gas/Diesel.
Verified

Hello,

If you do not have the digital throttle and shift (DTS) you can swap the PCM's and see if the problem goes to the other engine.

Has your mechanic done a computer scan on the engine? The Mercury computer diagnostic system has a smart coms box which can be connected to the engine for a water test. When the engine acts up it will record (or you can manually activate) the engine data which can be down loaded to the lap top later for review. This data can also be emailed to Mercury for analysis.

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Customer reply replied 13 years ago
hi. they already did a computer check twice in front of me and everything comes up as if it is fine. and they also checked the fuel and the fuel tank which came up fine as well. whats a pcm? is it hard to get to ?

two computer checks have been done in front of me and they come back fine . even if i switch the pcm both engines would still have a problem. they both give me a different problem. oh by the way the fuel tank and fuel was also checked and came back fine.

Marine Mechanic: Mechman45, Marine Mechanic replied 13 years ago

Hello,

If your boat were in my shop the next step would be. Go for a sea/lake test with fuel gauges and the smart coms box connected to the engine(s). It sounds like you have covered a lot of possibilities so far but you will need as much info as possible when the engines are acting up to narrow it down further.

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