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Max Online: 36273 @ 01/23/13 02:34 PM
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#11619017 - 05/22/16 08:27 PM 2009 Mercury 150 EFI Planing Problem
flowjack Offline
Outdoorsman

Registered: 12/02/08
Posts: 125
Loc: Texas
This just started. When motor is idling it has a slight vibration but as you throttle up it seems to go away. It's also not getting on plane as quick and top speed dropped about 7-8mph (gps). Could this be a spark plug or coil problem? Had one coil replaced last September and the mechanic said to expect another to go out at some time, a problem that Mercury has had in the past and was covered under warranty but not anymore.

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#11619096 - 05/22/16 09:04 PM Re: 2009 Mercury 150 EFI Planing Problem [Re: flowjack]
Bobby Milam Offline
Extreme Angler

Registered: 07/13/14
Posts: 1989
Loc: Arlington
Just had a similar problem and it was electrical. Lost spark to two of my cylinders. Took it to my mechanic and he found the problem in about 5 minutes.

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#11619134 - 05/22/16 09:18 PM Re: 2009 Mercury 150 EFI Planing Problem [Re: Bobby Milam]
flowjack Offline
Outdoorsman

Registered: 12/02/08
Posts: 125
Loc: Texas
Feel like it is something simple. What did he have to do?

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#11619363 - 05/22/16 11:29 PM Re: 2009 Mercury 150 EFI Planing Problem [Re: flowjack]
Bobby Milam Offline
Extreme Angler

Registered: 07/13/14
Posts: 1989
Loc: Arlington
Hooked up some gizmo to it that arcs so you can see the spark on all cylinders. Mine was a little easier to diagnose because all of the electronic components except 2 had just been replaced. Mine was the switch box assembly. I tried the spark plug route before taking it in. He told me the same thing, the last component will go out within a year so prepare for it. Mine was carbs though not FI so it could be fuel related I guess.

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#11619560 - 05/23/16 07:42 AM Re: 2009 Mercury 150 EFI Planing Problem [Re: flowjack]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10513
Loc: Littlefield Tx & Lake A. H. US...
If you have: When motor is idling it has a slight vibration but as you throttle up it seems to go away. You are down a cylinder because of the ignition, an injector or compression.
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#11626930 - 05/25/16 09:09 PM Re: 2009 Mercury 150 EFI Planing Problem [Re: flowjack]
flowjack Offline
Outdoorsman

Registered: 12/02/08
Posts: 125
Loc: Texas
No fire in the #1 coil pack. Ordered a new one today.

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