check engine light no power

[mercedesautohaus]

the check engine light comes on the port engine and says no oil pressure but the analog guage is correct , the engine goes in to limp home and you cannot accelerate and the right engine has lots of white smoke and a lack of power but no check engine light, the boat is a 2006 340 sundancer any help would be appriciated

 

[fwebster]

Without scanning the ECM for faults, this is a guess, but there is a known problem with Mercruisers setting a temp or oil pressure fault with any minor hiccup in the sender circuits. In your case, it seems as though you might have narrowed the problem down to the oil pressure sender on the port engine.

In Florida on a cool day, seeing a lot of steam (white smoke) out of the exhaust isn't unsual. Look for other trouble indicators like low coolant, poor cooling water flow or high engine temps on the stbd side before getting excited. Could you just be feeling the drag from the port engine in limp mode when you try to power up the stbd engine. Merc 8.1's are big powerful and torquey engines, but it takes 2 of them to make a heavy boat like the 340 go.

 

[mercedesautohaus]

thanks for your help thats what it sounds like to me to someone took the engine manual when i bought the boat do you know where the oil pressure sensor is located and you may know this to where to buy a cartrage for my 6000i chart plotter

 

[fwebster]

Dude.............I need a decoder ring. Try using Capital letters and punctuation.

The oil sender is going to be near an oil gallery, most likely on the skirt of the engine block or on a filter mount. Its been a long time since I've owned a gas Merc so I'm going by common sense here. You can also look at an online parts break down for your engines and get close..........

Try this:

http://www.marinepartsexpress.com/merc_sch_fs.html

Look under "engine block- pistons".........

I can't get the page to scroll. I use an iMac and I suspect you need a PC to scroll about.

 

[tbirdvet]

Works OK on my iMAC.

 

[mercedesautohaus]

Thanks for the info, gonna see if i can correct the problem

 

[BonBini]

the check engine light comes on the port engine and says no oil pressure but the analog guage is correct.

Since your analog gauge is correct: Most engine manufacturers program default numbers into there ECM's. Typically by unplugging a input sensor like temp or oil pressure, the ECM will revert to a default setting. What this means is it would take the ECM out of "limp home mode".

Now I'm not saying your particular ECM is programmed like this or run your boat like this. What I am saying is working knowledge like this is handy to get oneself out of harms way at times.

Another thing that GM does is redundant inputs. ie: if say your ECM gets no maf(mass airflow sensor) sensor input, it will use only tps(throttle position sensor). Engine runs poorly but it runs.

I gota agree with what the Webster said above on engine loading of the stbd. She's undoubtedly overloaded and that exhaust is smokin hot.

...Ron

 

[BonBini]

One more thing: If it ends up being a failed oil press sensor. On rare cases they fail because they get plugged with foreign debris., if your engine is making metal! Cut open the oil filter and inspect the media just for a piece a mind.

...Ron

 

[Rum Runner]

Thanks for the tip on the website, it's going to come in handy.

 

[flflatrate]

I see many of those oil pressure sensors going bad on the 8.1's it looks ecactly like the water pressure sensor the part number is 1 number off though. the sensor is located under the hose of the oil cooler on the side of the oil filter. you need a 1 inch wrench to remove.