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1994 5.0 Cobra EFI stuck at 25% power

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  • 1994 5.0 Cobra EFI stuck at 25% power

    I have a 1994 Four Winns with a 5.0 EFI OMC(Ford) Cobra Engine. The boat starts fine and runs well in neutral, even up to 5000 RPM. When I put the boat in to gear and attempt to take it to WOT the engine will not exceed 2500 RPM and is getting no power to get it up on plane. There is minor backfire if I open the throttle up all of the way. It seems to me like a fuel problem but I have checked most points of the fuel system. I have been replacing parts and spending way too much money to keep guessing at the problem. Gas pressure is ok at WOT. I have done the following:

    Replaced the fuel pump
    Blown out the fuel lines
    Replaced the alternator
    replaced starter relay
    checked fuel pressure

    I have been told that the issue could be in the timing, so I removed the distributor to replace the pick up coil. Have not been able to disassemble the distributor(maybe another post), but their is minor corrosion on the old coil. Could that be the problem. If that does not fix it I plan on opening up the engine to adjust the timing chain. Has anyone experienced similar problems. Please HELP!! I can feel the minutes of the summer slowly sweating away as I sit in this greasy hole.


  • #2
    Re: 1994 5.0 Cobra EFI stuck at 25% power

    I highly doubt that whoever told you that it was timing meant that it was valve timing. They probably meant igniton timing. The only way valve timing would be off is if it was apart at one point and put back together a tooth off, and hopefully it would have been cought right way. Just check the ignition timing first. It's way easier. Could be a bad coil too. Take it off and check the specs with a volt-ohm meter. Don't throw parts at it. That's never the way to do it. There is ALWAYS a way to check a part before you just go out and buy a new one. Well... almost always.
    2000 Chris Craft 240 Bowrider
    5.7L Volvo Penta GSi

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    • #3
      Re: 1994 5.0 Cobra EFI stuck at 25% power

      check the ignition timing with a timing light. sounds like it may be "retarded" meaning the spark is occurring after it should. corrosion on the pickup coil isn't good either. a small amount of parts cleaner squirted onto an old toothbrush should be able to brush it all off without damage. re install distributor correctly, check timing with timing light, adjust as necessary.
      MY ADVICE... UH, YEAH, WHAT HE SAID.

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      • #4
        Re: 1994 5.0 Cobra EFI stuck at 25% power

        Sounds like your stuck in "fail safe" mode... or what ever OMC called it. Try disconnecting your water temp switch and oil pressure switch and see if any 1 of those brings the power back.
        just because you found it that way... doesn't mean it's supposed to be that way.

        Part of diagnostics is spending time figuring out not only what the problem is, but also sorting through what it isn't.

        The older the engine is, the chances of it having more than 1 problem goes up exponentially

        Boating has always been a rich mans hobby. Buying a new boat gets cheaper every year, but the maintenance, the repairs, and the overall cost of ownership of a boat has never gotten any cheaper.

        Comment



        • #5
          Re: 1994 5.0 Cobra EFI stuck at 25% power

          I have the same engine in a Larson, and i am as frustrated as you are. I have a completetly rebuilt engine with all new fuel injection components, and i still have the same problem. The ignition system is also new new distributor new coil, new TFI module wires plugs you name it. I have tried disconecting the oil pressure swicth, and coolant temp sensor to the SLOW fail safe mode and it has not changed at all. I did run the boat this weekend, and i did notice that at one point the engine just decided to accelerate to 4000 rpm at WOT. Then it would not. Could it be a Computer Issue or wiring with the computer?

          CAN ANYONE OUT THERE HELP US?

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          • #6
            Re: 1994 5.0 Cobra EFI stuck at 25% power

            Can anyone out there help us out. There are several of us on the Forum that have this same problem, and we have not been able to come up with a solution. Thank you in advance

            Comment



            • #7
              Re: 1994 5.0 Cobra EFI stuck at 25% power-PLEASE HELP SEVERAL OF US NEED HELP!

              Does anyone out there have experience with these 5.0 EFI ford engines? How do we test for this issue. I have replaced everything, but the computer, and still the same problem!

              Comment



              • #8
                Re: 1994 5.0 Cobra EFI stuck at 25% power

                OK, so I had not checked the fuel pressure as I just replaced the pump. I hooked up a pressure gauge and the pressure ran at 30 PSI dropping down to 28-29 PSI at WOT. Could this be my problem why I am not getting power past 25%

                Comment



                • #9
                  Re: 1994 5.0 Cobra EFI stuck at 25% power

                  Your fuel pressure is not the problem. I have the same exact issue with my engine, and cannot figure out why it is running like this. WE HAVE SOME COMPUTER RELATED PROBLEM. SO FAR I HAVE NOT HAD ANY LUCK REPAIRING IT. FORD ESPECIALIST OUT THERE PLEASE HELP!

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                  • #10
                    Re: 1994 5.0 Cobra EFI stuck at 25% power

                    the 2 of you guys should get together and split the cost of a manual.
                    just because you found it that way... doesn't mean it's supposed to be that way.

                    Part of diagnostics is spending time figuring out not only what the problem is, but also sorting through what it isn't.

                    The older the engine is, the chances of it having more than 1 problem goes up exponentially

                    Boating has always been a rich mans hobby. Buying a new boat gets cheaper every year, but the maintenance, the repairs, and the overall cost of ownership of a boat has never gotten any cheaper.

                    Comment



                    • #11
                      Re: 1994 5.0 Cobra EFI stuck at 25% power

                      ...and once the manual is in look up what sensors would put it into reduced power mode (low oil pressure, coolant water flow too low, etc...)...


                      Disconnecting sensors and/or wires may do the exact wrong thing as far as what will make the computer think all is ok and just keep it in failsafe mode, you need to bypass/test it however the manual says to check the sensor. I'm just sayin'.....
                      1991 HydroSwift 2200 Cuddy Volvo Penta 570/DP
                      1980 Glastron SSV167 90HP Mariner

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                      • #12
                        Re: 1994 5.0 Cobra EFI stuck at 25% power

                        I have two manuals for this engine. a Seloc & the factory Volvo\OMC manual. there is little information in either manual about this SLOW fail safe system. There is a wiring diagram for the sensors, which i have already checked. My wiring and sensors are OK. The manual tells you that the computer will not store a service code for this system. It seems that there is no info in the manuals about this condition.

                        Comment



                        • #13
                          Re: 1994 5.0 Cobra EFI stuck at 25% power

                          The seloc manuals good for a kneepad at best....
                          I thought it was 95 for VP/OMC... not 94... so are you sure you have the correct manual for your engine? On most MEFI engines there is a manual for the engine and a manual for the MEFI system and you need both.
                          So first we need it ID exactly what ya got. Can you post your model and serial ##'s for us?
                          just because you found it that way... doesn't mean it's supposed to be that way.

                          Part of diagnostics is spending time figuring out not only what the problem is, but also sorting through what it isn't.

                          The older the engine is, the chances of it having more than 1 problem goes up exponentially

                          Boating has always been a rich mans hobby. Buying a new boat gets cheaper every year, but the maintenance, the repairs, and the overall cost of ownership of a boat has never gotten any cheaper.

                          Comment



                          • #14
                            Re: 1994 5.0 Cobra EFI stuck at 25% power

                            My engine is a 1994 OMC Ford EFI/ Volvo penta SX. I have the correct factory manual from volvo. it comes with separate books for each system ie: ignition, Fuel injection ect. I have gone through the entire manual and have not come up with a solution. We both have the exact same issues with these engines. Any help you can offer will be greatly appreciated.

                            Comment



                            • #15
                              Re: 1994 5.0 Cobra EFI stuck at 25% power

                              Have you had any luck repairing the problem?

                              Comment

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