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    2003 Mercury optimax ran great as twins, doesn't run correctly as a single engine.

    I have a pair of 2003 150 optimax motors. They came off a 2004 whaler and were on the boat with smart craft gauges. Both motors ran fine when they were removed. I recently installed the counter rotated motor on a project boat and I have all sorts of crazy codes. I didn't hook the smart craft...
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    how to set base timing on 5.0 mpi

    serial number OM603659 This is the newer style distributor with the 6 and 8 in the base. I know to put the pointer at the 8. my question is how do I know if the motor is in the correct base timing? I have installed the distributor with all 3 marks at the based lined up and the pointer at the 8...
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    2007 Mercruiser 5.0 tks 4000 rpm's maximum?

    Serial # 0W640972 Alpha Drive I put the boat in earlier this year and figure out it suffered freeze damage. Other than the block leaking it ran perfect, but the oil had a little milk. So I ordered a 5.0 long block and had a friend who is a marine mechanic help me swap everything over. We took...
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    2010 mercruiser 350 mpi, one soild beep every minute

    I have 2010 mercruiser that has one solid beep every minute. Otherwise runs perfect and the lube bottle is full. The beep is the same if you unhook the lube bottle. Is the sensor bad and is there a way to test it? or could it possibly be something else. It looks like according to the manual the...
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    Volvo penta Gxi-e will spin over but never cranks

    I have a Volvo penta 5.0 gxi-e. I am not getting 5 volts to the injectors. One minute the boat will crank and run perfect, when it does there is 5 volts. The next minute it won't and there is like 1 volt. I have switched the ECM and the problem remains the same. I have 12 volts going into the...
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    yamaha f150 txrd low on power

    I have a f150 txrd that is off about 1000 rpm's at WOT. However it runs perfect and doesn't miss or sputter at any rpm. It use to run around 5800 and now only runs about 4800. The fuel pump in the vst locked up, so I put a new pump in the vst and cleaned the screen, when I put it in the lake it...
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    mercruiser 4.3 MPI starts but won't take fuel

    i have a Mercruiser 4.3 MPI that will start and run but will not take any fuel. It idles fine, but when you give it gas it bogs and tries to die out, if you close the butterfly it goes back to idling fine. I have checked all the sensors and they seem to be fine, DDT is not showing any codes...
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    Injectors 3,4,5 and 6 not firing 4.3 MPI

    I have a 2006 model 4.3 mpi with an alpha, I have the motor out of the boat to replace the head gasket, all the work is done and it is back together. The motor will spin over, but not start. I tested it with the DDT and when doing an injector test injectors 3,4,5 and 6 are not firing. I can...
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    how do you run the valaves on 2001 volvo 5.7 gxi-a

    wondering if there is a special way to run the valves on a 2001 volvo 5.7 gxi-a. it has roller rockers and roller lifters, but doesn't have the one piece rocker assembly. Do you just torque them to a certain spec? or do you have to run them like old school hydraulic lifters? or are they set to a...
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    01 Volvo 5.7 GXI-a irradic idle and loss power

    i have a volvo 5.7 gxi-a that recently has devloped an irradic idle and loss of power. The compression is good, seems to have good spark, timing seems to be set right, fuel sample is good and pressure is good. Motor seems to have a shake at idle and the shake gets worse under a load. According...
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    03 Yamaha f115tlrb won't stay running

    I have a 2003 yamaha F115tlrb that will run fine for a while and then just dies, you can crank back and run fine at idle but if you give throttle over about 1500 it just dies. We took it to the lake and put a fuel pressure gauge on it and when it dies the fuel pressure was going away. I...
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    riding across lake and fuel pump cut off on 5.0 mpi, need help

    i was riding across the lake and my boat just slowed and died. After a little diagnosing I figured out the fuel pump cut off. I switched the relays on top of the motor and checked the fueses, but still no fuel pump. I had someone tow me home and figured out i can power the pump externally and...
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    08 Mercruiser 5.0 carburated, alpha drive, fuel pump cuts off

    I have a 08 tahoe deck boat with a Mercruiser 5.0 carburated motor. It has the alpha outdrive. The motor will crank and run, but quickly runs out of gas. After some diagnosing I have discovered the fuel pump cuts off after the motor is running. I get fuel pump activation with the key switch and...
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    5.0 amercruiser mpi has alarm and low power

    I am getting the 2 beeps per minute alarm and the boat will go into guardian and reduce to 90%, but the actual power the boat normally has is also off. I has a hard time planing and takes forever to reach 4000 Rpms. I changed the IAC and nothing changed. I changed the pitot sensor and nothing...
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    2004 mercuiser STB EMCT CKT Hi

    it shows a 32 degree fault, but i have looked in the manual at the diagram and I am not sure which sensor this is and where it is located. the motor is a 5.0 mpi serial number OM692020
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    how much deflection should a driveshaft have on a 2008 DF150

    i have a 2008 DF 150 with a clunking when it is in gear. It is a constant clunk, clunk. clunk in forward or reverse. There is no metal in the oil, but there is about 1/8 of a turn on deflection in the drive shaft when in gear. I was wondering what the acceptable amount of deflection is and is...
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    Anyone ever removed a volvo XDP drive?

    Just wondering if it comes off like any other Duoprop or if there are any tricks? Just got a boat in and need to remove the drive, but have never fooled with one of these before.
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    boat will not crank without throttle advanced

    I was wondering that the tps % should read on a 350 mpi when the throttle was not advanced? My boat started not cranking without having the throttle advanced just slightly. I hooked it to the ddt and with the throttle not advanced the TPS is at 0%. I adjusted the throttle cable where the tps...
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    03 Mercuiser 350 MPI running hot

    I have a 2003 Monterey 228 SI with a Mercruiser 350 MPI and a Bravo drive. At anything about about 4000 rpm's up to WOT the motor will creep up to 200 degrees and alarm. When this happens I can shoot the motor with a thermometer and the lower block is about 170, that manifolds are about 180-190...
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    Mercruiser 3.0 Steering problem

    I have a 2003 Mariah with a 3.0 Mercruiser and alpha drive. Only with the motor running, when you turn the steering all the way to the left it locks up. If you cut the motor off it will immediately release itself and steer fine. I have replaced the pump and the hydraulic steering cylinder. I...
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