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    Mercury 150 EFI TPS Voltage Question

    2000 Mercury 150 EFI has TPS that's reading out of spec.The entire output range is only reading .025v-.035v(idle to WOT) and per the manual should be like .2v-7.0v. So bad TPS, right? My question though is if anyone knows the correct incoming voltage to the TPS via the orange wire. My orange...
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    2000 Mercury 150 EFI down two cylinders

    I'm chasing a problem on a 150 EFI, year 2000. Cylinders 2 & 4 are failing drop test though when boot is pulled while running, i do see a spark. When plugs are pulled, 2 & 4 are much cleaner than the rest. Like Brand new clean. 2 is cleanest with no sign of combustion whatsoever and 4 has very...
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    VST very hot after ECU Bypass / 2000 Mercury 150 efi

    I have a mercury 150 efi on which i have bypassed the ECU fuel pump driver via the purple wire and keyed relay kit. Motor ran okay but started a little rough and would not idle in the water without adding a bit of throttle. after a frustrating, if not dangerous day on the water, i neglected to...
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    mercury 150 efi intermittnent fuel pump

    okay, i have tricky intermittent problem with a 2000 150 efi saltwater series. hoping someone can help!!! The motor cold starts just fine and will run for half an hour or more. i can turn it off and let it sit for 10 minutes or so and it will start right up and continue to run, no prob. BUT, if...
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    mercury 150 efi fuel pump

    i have a 2000 mercury 150 efi salwater series. i'm experiencing a problem with the fuel pump. when i turn on the ignition without cranking the motor, the electronic fuel pump does not come on unless i jump the negative pole on the fuel pump to ground. also, once the jumped pump does turn on, it...
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    mercury 150 efi fuel pump

    i have a 2000 mercury 150 efi with an intermittent fuel pump problem. when i tried to start the boat yesterday, i noticed i did not hear the fuel pump turn on and not surprisingly, neither did the motor. when i tested the poles on the fuel pump on top of the VST, i got 12v on the positive and...
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    mercury 150 EFI 2 cylinders not firing

    i have a 2000 mercury 150 efi saltwater series motor. the past few times i've run the boat, it would run on only 4 cylinders for the first 5 minutes or so. after the motor's good and hot(and under load, can't replicate on muffs), the other two will kick in and it will run perfect all day. it...
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    Mercury 150 EFI down two cylinders(not always the same ones???)

    i have a 2000 mercury 150 efi saltwater series motor. the past few times i've run the boat, it would run on only 4 cylinders for the first 5 minutes or so. after the motor's good and hot, the other two will kick in and it will run perfect all day. it will even run fine after hours of sitting...
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    2 wire trim motor on 87 115 lower unit

    i've put a 2002 115 powerhead on a 1987 lower unit. i'd like to convert the trim motor from 3 wire to 2 wire. does anybody know if the 2 wire motor is compatible with the three wire pump and trim unit?(both single ram units) i tried the three wire motor by hooking blue and green wires into the...
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    putting 3 wire trim system on motor set up for 2 wire.

    does anybody know if it's a big deal to put a 3 wire trim system on a motor set up for a 2 wire system? i'm switching out the lower unit on a 2002 115 with a lower unit with 3 wire system. will this be a problem? thanks
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    150 efi overheat

    i have a merc.150 efi that has been having an overheating issue for a few months. i've gone through all of the obvious steps to correct it; water pump/impellar, thermostats and poppet valve. none of these repairs have corrected the problem. can anybody tell me the next thing to try? the overheat...
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    150 EFI sticky throttle

    i have a 2000 150 EFI that seems to have a sticky throttle. the problem started out only occurring in reverse. when i'd give it more than about 2k rpms in reverse it would get stuck open, cavitate and run away. at this point i'd kill it, pull the cowling and have to manually push the main...
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    mercury 150 trim / tilt

    hey there, i've got a leaky trim / tilt system on a 2000 mercury 150. i've cleaned all of the cylinders to try and get an idea of where the leak is located, but i can't quite see where it's coming out. it seems to be somewhere pretty low on the system. it's not gushing or anything, just about a...
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    filling power trim/tilt 2000 mercury 150

    can anyone tell me the correct procedure for filling the tilt/trim system on a 2000 merc 150 efi? i see only one plug on the system. it's located on the bottom right of the port side trim cylinder. accessing this plug is no problem with the motor trimmed all the way up, but shouldn't i be...
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    150 efi overheat problem

    so, i have a 2000 mercury 150 efi that's having a cooling problem. i ran the boat the other day and noticed it wasn't peeing, so i felt the top of the starboard powerhead and it was VERY hot. shut the engine down, ran it on the direct hose at the ramp and it ran fine. i figured it was a bad...
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    150 EFI water pump trouble

    i have a 2000 150 EFI with an apparent water pump and/or impeller failure. had the boat out last night and noticed it was not pissing. so, shut the motor off and felt the head which was VERY hot. also noticed quite a bit of steam coming out of the pee hole. so here come the quesitons: 1) is my...
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    mercury 150 efi tachometer

    can anybody tell me how to start trouble shooting an erratic analog tachometer on a mako195 dc with a merc 150 efi. the gauge does respond a little bit but is doing this really weird bermuda triangle thing where it jumps all around. thanks for the help
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    mako 195 erratic gauges

    can anybody tell me how to start trouble shooting an erratic analog tachometer on a mako195 dc with a merc 150 efi. the gauge does respond a little bit but is doing this really weird bermuda triangle thing where it jumps all around.
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    cracked transom on MAKO 195

    hey all, i just picked up a 2000 MAKO 195 DC and noticed(a little too late) a 3.5" long crack on the very top right edge of the transom. this is the only spot on the transom that has any sign of defect and i was wondering if anybody can give me, first a prognosis on the severity of my problem...
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    yamaha pro 50 power tilt hydraulic failure

    i have a motor stuck in the down position due to an apparent hydraulic failure in the lift cylinder. i assume it IS a problem with the piston and not the lift motor because i can hear the motor run in both directions but there is absolutely no lifting happening. 3 questions: 1) where is the...
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