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Mercury 150 xr2 question

L

lancelyons

Member
Hi, I recently had my boat out fishing (87 Mercury Xr2 150) and when moving the boat 50 feet to a new location after being anchored for 2 hours, an Alarm went off and the motor did not seem to run properly although it ran.

It seems like 50 feet and shut a short on time that it would be hard to be a temperature alarm. I checked the oil reservoir on top and it had oil. Tried to adjust the float to see if it was that alarm and nothing. The motor was pumping a steady stream of water out the pee tube so that was fine. However the boat would not get on a plane and ran very sluggish. I was 5 miles away from the boat ramp so I just idled the entire way back.

Any ideas what would happen where this alarm would go off at the same time the motor stop responding well? I have the manual so going to dive in this weekend but wanted to see what people thought.

Thanks in advance
Lance
 
lancelyons said:
Hi, Its a beeping alarm. Fixing to go out and look at it once I get the coffee wrapped up.
Click to expand...

So far I have just checked the stator impedance and that seems to be ok 51.5 red gnd 52.1 red-wht gnd 2.3K blue gnd 2.25K blue-wht gnd


the rest of my time just digging for info on the net.

I'm guessing the beep beep beep sound was oil warning.. not sure what could have happened to cause the alarm and the motor to stop responding (would only idle) to happen at the same time.

I am assuming that since there was oil in the smaller reservoir on top that it would gravity feed enough to prevent any motor damage just idling back in.

I have the motor manual for the 150 Xr2. I cant see anything in the manual that discusses the various alarms.

If anybody has seen anything like this and wants to chime in, that would be appreciated.
 
First put some oil in fuel if your going to continue to use it!!! Oil will not gravity feed!!!! Next check the ignition system as if oil module does not see imput from #5 cylinder it will trigger alarm. Also no/slow rotation of oil gear bushing will trigger alarm.
 
Have been fairly busy with work so haven't had a bunch of time to work this. I did manage to check the compression on all 6 cylinders and they where all around 100-105. Attached a timing light and could see good spaced fires on 1,3 and 5 but intermittent fires on 2,4,6.

I still had the constant beeping alarm while running. I need to find the alarm wiring diagrams and details to figure out whats happening. I have the motor manual but I don't see anything related to Alarms in it. I am not sure what you mean by this "
Next check the ignition system as if oil module does not see imput from #5 cylinder it will trigger alarm​
".

Does anybody have any info on the alarm diagrams (oil, high temp, etc), troubleshooting.

Thanks
 
I also noticed that the oil alarm module has a lead that ties into the switch box that controls the firing on 2,4,6. Could a signal from the oil alarm cause the firing on 2,4,6 to be intermittent? That might explain why the motor would not run well.

on another site I saw this mention as well "
Oil pump sensor generates a small ac voltage as the magnet passes by the coil. In your very first post you stated that you had tested and it produced @ .5 V which should be within spec if I had the factory manual to look it up.

Test for spark. #3 or #4 ignition coil feed wire is the comparative pulse that the oil module uses. A failing ignition module on that cylinder, a poor connection on either end of that green wire, or an internal break in the wire, to that cylinder/coil, will cause an oil alarm.​
"
 
Just wanted to finish up this thread by saying that it was indeed one of the power packs that went out that also caused the oil alarm because the voltage on cylinder 4 coil did not sync with oil pump signal. I picked up 2 brand new power packs for $29.00 each from Amazon and they worked perfectly. $60.00 back on the water.

https://www.amazon.com/gp/product/B0773DTXXQ
 
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