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  1. J

    90 4 stroke

    HELP? My 90 4 stroke is showing the engine warning code that indicates map sensor 2 (3 beeps, pause, 2 beeps). My mechanic told me bad news; there is erosion in the manifold? does that make sense? And the whole engine has to be torn apart to correct? It's all greek to me. Has anyone gone through...
  2. J

    fuel flow meter

    I have a fuel usage meter on my boat; twin 90 four strokes. The gauge works but does not read anything. I know where the sensor is in the fuel line. Is it a big deal to replace this sensor.
  3. J

    older 9.9 water pickup tube

    My 9.9 has a pick up tube on the front of the lower gearcase housing; and you can't use the "ears" to flush the engine. Is there a way to flush the engine without sticking the lower unit in a barrel? I thought of a piece of PVC with a female hose fitting attached? Or maybe they made something...
  4. J

    pressure gauge

    I don't understand how the pressure gauges on my twin 90 4 stroke work? I see a black tube attached to the back of the gauge? Both were showing app. "10" and now is showing "5" and I don't know what they mean or how significant they are? Both motors are pumping water fine; and the same stream...
  5. J

    what year is my 9.9

    Just bought an older 9.9. Was able to read a partial serial # as follows: P/ 4 numbers unreadable/7452A7. Any ideas. Also, is there any way to run fresh water thru from a hose; without placing the engine in a barrel? The pickup is a hole on the front of the lower unit...is there a way to...
  6. J

    fuel mix

    What is the fuel mix for an older Mariner 9.9? I was told 100/1; but I want to be sure.
  7. J

    pressure gauges

    I have apair of 2007 90 HP 4 strokes with pressure gauges on the dash. I know these refer to the water pressure thru the engines; but I don't know what they mean or what they should read. One reads app. "10" at cruise and the other "8." Is that where they should be reading? If the numbers...
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