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  1. CLi87

    1998 Mercury 150 EFI Flooding Out

    It's not coming out of the overflow from the VST, it's coming out the hose that connects to the VST, I also did some more testing to see if all the cylinders were flooding or just some, seems it's just cylinder 6, I'm not sure if that's because it's the lowest cylinder causing all the fuel to...
  2. CLi87

    1998 Mercury 150 EFI Flooding Out

    In the diagram, should line e to the upper manifold lower fitting have fuel shooting out of it when cranking over? I had disconnected that line originally to see if the VST was overfilling but to my surprise the hose was shooting fuel out when cranking over, not running, just cranking, no...
  3. CLi87

    1998 Mercury 150 EFI Flooding Out

    Thank you!!
  4. CLi87

    1998 Mercury 150 EFI Flooding Out

    I do have an understanding of electronic component testing with a good voltmeter, I'm an inboard Mercruiser tech with 7 years of experience, I'm just not too familiar with these old EFI 2 stroke outboards and I just didn't want to spend $80 on a manual if this was just a simple problem, it's a...
  5. CLi87

    1998 Mercury 150 EFI Flooding Out

    Do you know where the TPS is on this motor and how to test if it's stuck in WOT?
  6. CLi87

    1998 Mercury 150 EFI Flooding Out

    Hey all, i'm working on a 1998 Mercury 150 EFI and the issue is it keeps flooding out, I can get it started by holding the throttle all the way down but if I let off it'll immediately die. At first I thought it was too much oil mixing into the gas as I saw a lot of blue smoke, but I completely...
  7. CLi87

    2004 Mercruiser 3.0 Water/Oil Mix Coming Out of Breather

    I did look all around the block and didn't see any cracks or rust spots from water dripping, outside of the block was extremely clean, I also checked again after having the issues but no sign of any external crack so I guess it must be internal somewhere, I get internal crack causing water to...
  8. CLi87

    2004 Mercruiser 3.0 Water/Oil Mix Coming Out of Breather

    I did a search and found some similar threads but no real answer to my issue. I have a 2004 Mercruiser 3.0 with unknown history, supposedly the boat was winterized but I'm not sure if it was done properly. When I got the boat, the oil looked good and compression test was good, on the first trip...
  9. CLi87

    Will Optimax/EFI lower unit work on a 225 Offshore?

    I just recently bought a boat with a Mercury 225 offshore motor on it, the previous owner said it needed the lower unit replaced, can I use a lower unit from a optimax or EFI 225?
  10. CLi87

    Swapping 88' 454 Truck Engine to Replace 93' Mercruiser 454

    After multiple issues with the engine in my boat I've decided to just swap the block and heads out. My neighbor just happened to have an 88' 454 motor (Gen IV?) from a suburban with 100k miles sitting around so I got that from him and stripped it down. I know I have to move the accessory...
  11. CLi87

    Water leaking from block but pressure tested fine?

    I just put new head gaskets on both sides, but even if it was the head gasket, would I not hear air coming out when pressurized?
  12. CLi87

    Water leaking from block but pressure tested fine?

    I tried looking around but if it was coming from the exhaust manifolds and pooling wouldn't I see a rust line coming from the leak or at least some type of residue?
  13. CLi87

    Water leaking from block but pressure tested fine?

    Yea, I pulled the drain plug on both sides then put one back in and hooked the leak down tester to the other hole.
  14. CLi87

    Water leaking from block but pressure tested fine?

    This has got me really confused, Mercruiser 7.4 Gen V I was looking and saw some water dripping from the side of the block, naturally I would think cracked block but just did a pressure test and the cooling system holds pressure fine and I don't hear any air coming out?? I looped the two exhaust...
  15. CLi87

    What are the 2 sensor on the thermostat housing?

    I'm thinking it must the sensor, I got a new one I can put in just waiting for PB blaster to loosen it up a bit, it's stuck on there tight. I switched the gauge out with the new gauge and it's also reading high so it must be the resistance reading is wrong from the sensor.
  16. CLi87

    Mercruiser 7.4 Oil Pressure Alarm Goes Off Randomly?

    I have an alarm that keeps going off randomly, sometimes I run the engine and it'll never go off, other times it starts buzzing and doesn't stop, I think it's the oil pressure sensor anyway, it's got a white with blue stripe wiring going to it. My oil pressure gauge on the dash reads perfectly...
  17. CLi87

    What are the 2 sensor on the thermostat housing?

    To be honest I didn't compare the temp gauge with IR reading at the thermostat when it was "working", but it stayed between 160-180 originally, right now it's going up to 220 on the gauge while the IR is only reading 150-160 at the thermostat.
  18. CLi87

    What are the 2 sensor on the thermostat housing?

    Well I spoke too soon, my temp gauge works but it's reading about 60-70 degrees high, it was working fine previously, gauge go bad suddenly?
  19. CLi87

    What are the 2 sensor on the thermostat housing?

    Found the problem, connector at the sensor was badly corroded, sliced open the heat shrink and the wires to the connector were green and basically dust. Cut the wire back a bit, put on a new connector and the old temp gauge is reading again.
  20. CLi87

    What are the 2 sensor on the thermostat housing?

    I did some more testing and when I ground the tan pole out on both the old and new gauge the needle does max out, so I guess it's a wiring problem with the tan wire, gonna do some more diagnostics to try to find the break.
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