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1997 PCM Sea Maxx 5.7L TBI rpm'S limited at 1800

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Brent P

New member
My 1997 Shamrock inboard started losing power and will not go past 1800 rpm's. Seems to idle fine. Fuel pumps and filters all new - plenty of fuel. Acts like some sort of a sensor is telling the computer to limit the rpm's. Any ideas ? MAP sensor or is there an oil pressure sensor ?
 
did you check the fuel pressure, under load? If its not within spec, the engine won't get enough fuel and will not make full power...

a scan tool may be able to help by telling you what the computer sees for inputs...
 
The fuel pressure was checked a month ago and the fuel pump inside the fuel control cell was replaced. Ran great since. I'm thinking it's a bad MAP sensor or oil pressure sensor telling the computer to throttle the engine.
 
don't you think that something has changed? Until you know what that is you have two choices: Guess what changed or FIGURE out what changed (yes, diagnosis)...seems you have already chosen your path and embarked upon it...
 
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