Mercury 150 EFI Issue

This topic has 9 replies, 5 voices, and was last updated 9 years, 12 months ago by C130.

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June 13, 2016 at 11:40 pm #363132

C130
Participant

Another question or specifically a problem I just experienced. Just bought an 08 Sabre with a Mercury 150 EFI. Motor has about 120 hours on it. Today, my son and I launched to go fishing and motor starts right up and idles fine but when I went to accelerate itll only go up to around 2200 RPMs and thats it. Any ideas? We are on vacation a 10000 miles away from home and planned on fishing every day. I just had the impeller and lower unit oil changed. Mechanic also hooked up a computer last week and everything showed good. Merc monitor shows all systems okay. Here are some numbers fromthe Merc monitor. Rpm 630Coolant temp 143Water pressure 3.0Fuel pressure 43Fuel flow 1.0 Last edited by C130 on June 14th, 2016, 1:44 am, edited 1 time in total.

June 13, 2016 at 11:42 pm #363135

Bass Cat Boats
Keymaster

Fuel line and bulb from ethanol it sounds like.

June 14, 2016 at 12:57 am #363137

Bass Cat Boats
Keymaster

Bass Cat Boats wrote:Fuel line and bulb from ethanol it sounds like.Previous owner said he only ran non ethanol gas and thats all (2 tanks worth) Ive put in it. Wondering if it could be water. I took the fuel filter off but didnt notice any water but I didnt catch the first part that ran out either. I filled up before this trip and ran half a tank before this issue.

June 14, 2016 at 1:15 am #363140

Bass Cat Boats
Keymaster

If you ran a half tank recently then ethanol is probably not the issue. It sounds like a simple item and we would check all the plug wires.

June 14, 2016 at 1:41 am #363143

Bass Cat Boats
Keymaster

Thanks, I checked them also and will take it out tomorrow and see how it runs. I really appreciate the advice and suggestions.

June 14, 2016 at 4:05 am #363145

Bass Cat Boats
Keymaster

There is little to do on electronic ECM controlled engines. Rebooting them by disconnecting the battery is seldom a solution, though can be tried. The battery connections are a potential issue so that accomplishes both. The fuel hoses still can deteriorate and newer fuels harden lining on Mercurys grey hoses before the new B rated lines. Fuel lines (black) on the boat are most all ethanol resistant A1 or A2 series in the year model. We spec A1 and have all A1 now, though Mercury only requires B series. It sounds like you did your best to be prepared and these EFI engines are usually very reliable.

June 14, 2016 at 2:39 pm #363148

Jstew
Participant

Not a lot to fail on an 08 EFI. The computer handles virtually everything. Only two things I can think of are the pulse pump and the throttle position sensor. Pulse pump normally will keep it from “turning up”, but not limit rpms to 2200. The throttle position sensor could do just that depending on where it fails. I had one failing due to a “bad spot” in the module. It was intermittent and when “out” wouldnt get out of the hole. Its a pricey unit to replace, but essentially plug and play – not a lot in labor.The fuel lines could well be an issue if a liner has delaminated and sucks closed with fuel flow. Despite him saying it was only run on pure gas – theres no way I wouldve left original fuel lines in place. If the lines are gray with either orange or red markings – get it off of there and replace the bulb…..

June 14, 2016 at 3:18 pm #363150

BIGCATTER
Participant

Try pumping the bulb while accelerating . — That would feed more fuel to the engine . If it tries to go then you know its a fuel issue . —

June 14, 2016 at 9:36 pm #363153

ArkansasFisherman
Participant

Did it do this on your test drive / ride when purchasing it or is this just a recent issue?Purchased new 5/4/15Bass Cat Sabre Vision EliteMercury Pro XS 150MotorGuide 75lb Tour EditionHumminbird – Stock (will be changing soon I hope)

June 14, 2016 at 11:10 pm #363156

C130
Participant

Boat ran perfect up until yesterday afternoon. Boat was checked out by a mechanic right after I bought it and test drove it. Fuel lines are not the original ones, they were replaced by previous owner. Replaced the spark plugs and boat runs perfect. I took it to a local mechanic who could not find anything wrong with it except he stated the spark plugs could use replacing and recommended replacing them because he thought that might be the issue. He said the 150 EFI is known to foul plus occasionslly. I went and bought 6 plugs and everythings fine now. Mechanic did check compression, throttle position sensor, fuel pressure, and found no codes whatsoever when he hooked up his computer. Super nice mechanic, cost me one hour of labor which I thought was very fair for what all he checked. Last edited by C130 on June 14th, 2016, 11:14 pm, edited 2 times in total.
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