1998 Mariner offshore V-135 2.0 Liter Low oil alarm

[bjrrockwell]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

Ok still tried to jump the pos/neg post on coil itself and just got chatter on the meter. When i jumped off the switchbox at idle i got around 120V on all three outputs to coils. (115-125V) when revved up i still got same reading on top two but the bottom one was jumping EVERYWHERE couldn't get a solid reading (with DVA). still Alarms if I hook up the coil signal wire to module on any of them at that rpm but voltage out of switchbox seems normal on top two. Voltage on bias pegs was within 3 V of each other. Considering swapping one coil from right to left side then testing with the green wire to the coil once it has been switched. That wacky reading on the bottom post to cylinder 6 is bugging me too. And its really bugging me how the RPM's won't stay stable now at less then 1200 RPM. Could be completely unrelated as I haven't been able to open the motor up but have done lots of idling on the muffs.

 

[j_martin]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

DVA reading on the primary terminal of the coil should be steady, and shouldn't change much with speed. Drive from the switchbox, coil, secondary (spark plug) wire, and the plug itself will all affect the reading.

RPM's dropping at idle is a secondary problem. Solve all the primary problems first.

Normally, you don't need to run the engine at idle on the muffs for long periods of time for troubleshooting. It's possible that during your long learning curve, it got coked up and stuck a ring. Simple compression test would show that. Decarboning would fix it.

One question pops up with all this. Are you absolutely sure your grounds (switchboxes and coils) are good?

 

[bjrrockwell]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

ok will rerun compression test to be sure. no i am not positive the grounds are all good. coils are all grounded to plate on back of motor to same location as regulators. on different bolts but same plate. Cleaned the ground wire from plate to plate but did not clean the grounds for the coils. will detail those tonight. generally while running on the muffs never ran for more than a minute... started it. performed the necessary test and shut it down. i just didn't know by repeating this multiple times over the past month if that could have messed with anything so again will reperform compression test. Where do the switchboxes ground to? i'm trying to visual now without actually looking at them. there are the four wires on top one a jumper, three fromstator, three on the rear from the trigger (ithink) and three on the right to the coils... are the switchboxes grounded through the bolt that holds them in place? or am i missing a wire... again i will look tonight. Yea readings on the primary terminal of coil jump everywhere on all coils. Again will check them out tonight, plugs are a year old so will replace them too just to be sure that isn't the issue. again if its that simple I'll want to cry. Thank you again for your stellar patience with the newbie I am.

 

[bjrrockwell]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

due to my lack of knowledge as well is there a test i can perform to be ABSOLUTELY SURE the grounds are good?

 

[j_martin]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

electrical -- near 0 0hms.
mechanical -- gently pull and push one each crimped connection. You should feel no give or click.
visible -- clean, bright, and tight.

 

[bjrrockwell]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

Grounds all tested good both electrical and mechanical. Switched stator wires and left bank still out. ran compression and all were 110 except bottom left was 107.. close but not 110. Changed plugs from side to side and the left top improved to almost no alarm but other two still triggered alarm quickly. And top left did off and on. Gonna change plugs and see where that puts me.

 

[bjrrockwell]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

oh and as a note I DVA's the voltage from switchbox in question to coils on left bank... voltage increased from 90-100 volts to 200-240 volts with RPM if I'm reading it correct from up above this output voltage should stay constant correct?

 

[bjrrockwell]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

ignore above note. was not able to replicate that in tests today. replacing plugs tomorrow. still cannot get a stinking DVA reading on coils jumps all over does come in at points of reading 90-120 but jumps all over the place. Detailed all connections on coils. retested ground with meter set on 200 and got 0.8-1.2 on all ground wires from all coils to block.

 

[bjrrockwell]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

changed the plugs cleared up the rough running instantly. Only one problem, noticed bottom left plug was much cleaner than the rest. Ran quickly and tested voltage. voltage is below spec coming out of switchbox to left bank according to manual. but Stator power coming in acceptable. That lower cylinder was the one with the lower compression. sure enough pulled it and milky substance on plug so water in cylinder... What do i do now. i know not to run it. I sprayed in some oil and cranked a few times to spread. What are the potential sources for water in this cylinder, again its the bottom left.

 

[aussieflash]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

Could be entering via exhaust.
I had same prob with my alarm.Mech checked everything,module,sensor, wiring etc.Found it was my switch boxes and replaced trigger also.Cost me $1200.

 

[bjrrockwell]

Re: 1998 Mariner offshore V-135 2.0 Liter Low oil alarm

yeah its going into a mechanic on Friday. Pretty sure its the switchboxes and possibly the trigger as well. but that milk in the cylinder has me concerned but mechanic said i have been idling it alot without heating it up and it could be condensation. I am hoping that is all.