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2011 Mercury optimax. At 3500rpm alarm goes off and goes in guardian mode. Water pump and pressure good. Oil level is good. Oil pump working correctly. Changed internal pressure regulator. Any advice?

1 Answer

Brad Brown

Mercury Master 19,187 Answers
Posted on Apr 27, 2018

Brad Brown

Mercury Master

Joined: Nov 14, 2008

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This could be a lot of things. Have a computer scan done to see what the issue is. Could be a bad poppet or water pump. There is a sensor in the oil tank that can cause this too. Also the throttle sensor.

Testimonial: "Thanks for the info, I'll try these suggestions tomorrow!"

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Anonymous

962 Answers
Posted on Feb 06, 2009

SOURCE: oil light, noisy engine

What type of noise does it make. check if it has "blowby" . Blowby is when there is air coming through to the fuel system. It means that the rings , bearings , and other critical components are bad.The engine needs a complete overhaul or a new engine block. Maybe even the heads. if's it's a ticking, clicking kind of noise it is the valve lifters or rocker arm problem.such as the valves.

Ned C Cook

3433 Answers
Posted on May 08, 2009

SOURCE: Oil pressure gauge in 2003 Chev. Siverado

03 chev silverados have recall on instrument psnel for speedometer defefect. All onstruments were affected on my 03. Chk with dealer for recall time and mileage limitations to resolve. Good Luck

Harvey N Tawatao

3854 Answers
Posted on May 11, 2009

SOURCE: Low oil pressure light goes on until car warms up. Oil level is good

The oil pressure sending unit has gone bad. I sending unit is just above the oil filter and you can get to it from the top. When you face the Engine look down towards the oil filter, the oil pressure sending unit is just above that and it looks like a cylinder with two wires coming from it. If you don't see it, it's right between the exhaust manifold and oil filter.
If you go to Auto Zone or Parts Source, they'll have the oil pressure sending unit and the step by step instructions, When installing the new sensor. Do not use teflon tape or any sealant, the sensor is tapered and need's the good ground from the engine to give you right readings.
Good luck and hope this helps.

Harvey N Tawatao

3854 Answers
Posted on Jun 29, 2009

SOURCE: 1995 GMC Sierra z71 oil pressure dropped- need advice on this

The oil pump is in the oil pan and needs to be dropped and being a 4WD you also need to drop the front axle pumpkin to remove the oil pan and replace all the gasket needed. Start with the easy and replace the oil pressure sending unit, it's on the back of the engine to the passenger side of the distributor. You can go to Auto Zone and pick up a new Oil sending unit, just make sure your get the right one, "Sending Unit" Looks the same are the oil pressure sensor but the unit reads the pressure, the other just signal a light to go on and off. It's an easy fix like replacing a spark plug.

Anonymous

1615 Answers
Posted on Jul 15, 2009

SOURCE: 1987 Chevy S10 TBI 4cyl 2.5 L will not run. I

Check the injector for 12v on one wire. if good check the other wire for a ground witth the key on. The ground wire pulses from the ECM If you dont have 12v from one wire to the other but you have 12v from one wire to battery ground then be sure the ground wire is good to the computer. If you don't have 12 v at any time check for open hot wire or bad fuse. ADD 12v to the hot wire at the injector. DO NOT add to the wrong wire or you will fry the computer

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I have a 1999 mercury optimax 225 that has been running perfect. It died yesterday while cruising at 3000 rpm and will not restart. There was no sputter or alarms and no leaks. Any ideas?

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Engine tank should be plumb full tight. The engine supplies about 2 lbs pressure through one of the 2 lines going to the boat tank. The other line takes the oil to the engine tank. If that line gets kinked or pinched, the engine tank won't get oil, a check valve lets a little air into it, and the oil pump keeps getting oil. When it goes down just a little, the alarm goes off telling you something is wrong.

Sludge in the boat tank could plug up the pickup screen. I've also seen them plugged up by a foil oil bottle seal carelessly dropped into the tank.

Once you find out why the oil couldn't get there, start the engine with the cowl off and loosen the cap on the engine oil tank until it leaks, then tighten it down and clean up the mess. That tank is normally plumb full tight.

If when the engine is running, you crack the cap on the boat tank, you should hear pressure let off. If the cap leaks, it won't build up pressure. If there is pressure, the oil line is plugged or kinked.

If pressure isn't supplied, the problem would be the crankcase check valve on the engine, lower forward starboard side, with the hose going to it.

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www.fixya.com/cars/t7880379-oil_pressure_drops_zero_idle_2002_gmc Jan 18, 2011 - You could have three possable problems that I can think of. 1) Your oilviscosity is too low and you need to change it to a higher level. A 5w/30 .

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Oil pressure warning light is buzzing and i've replaced the sensor on my 94 vw golf

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Jun 16, 2009 • 1994 Volkswagen Golf

1helpful

1answer

Check gages light on and oil gage goes from low to 60 % intermittant. Sometimes right in a row and sometimes not for minutes. Oil check at right level and color of oil good. Just changed 2 weeks ago. It...

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May 18, 2009 • 2004 Mercury Mountaineer

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I have a 1999 mercury optimax 225 that has been running perfect. It died yesterday while cruising at 3000 rpm and will not restart. There was no sputter or alarms and no leaks. Any ideas?

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2011 Mercury optimax. At 3500rpm alarm goes off and goes in guardian mode. Water pump and pressure good. Oil level is good. Oil pump working correctly. Changed internal pressure regulator. Any advice?

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Related Questions:

I have a 1999 mercury optimax 225 that has been running perfect. It died yesterday while cruising at 3000 rpm and will not restart. There was no sputter or alarms and no leaks. Any ideas?

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Oil pressure warning light is buzzing and i've replaced the sensor on my 94 vw golf

Check gages light on and oil gage goes from low to 60 % intermittant. Sometimes right in a row and sometimes not for minutes. Oil check at right level and color of oil good. Just changed 2 weeks ago. It...

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Cars & Trucks

I have a 1999 mercury optimax 225 that has been running perfect. It died yesterday while cruising at 3000 rpm and will not restart. There was no sputter or alarms and no leaks. Any ideas?

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