Volvo penta will not go past 2,400rpm pls help

[Franzel311]

Hello all, iv got big problems have a 201 liberator with a 1995 Volvo penta fuel injected 5.7 . The problem is once after 2,400rpm one of the injectors shuts down its a two barrel throttle body so I'm loosing half the engine. It runs fine at dock and runs like a raped date if u floor it from idle but after about 30sec of going it pops and falls flat on its face if I bring it back to idle and try again it does the same thing if I creep up from idle at 2400rpm it pops and falls out...I brought it to the local marina and they tell me it needs an ICM for 2500$ but from what iv been reading it seems like it's being out into limp mode for some reason and the exam is just doing what it's supposed to ..they replaced the map sencer he said it was bad ..any help would be greatly appreciated

 

[bruceb58]

You may want to see if the temp switch or oil pressure switch is set such that it is putting you into SLOW mode.

These are not the same as the senders that are connected to your dash gauges.

 

[Franzel311]

Ok that sound like a good idea but I have no idea what that is where would I find that....one more bit of info I just put this motor in my boat but I didn't play with anything I just unbolted engine from stringer pulled it out droped it in my boat aligned it and bolted and pluged

 

[Franzel311]

All gauges r fine

 

[bruceb58]

All gauges r fine

That doesn't matter. The switches that connect to the ECM are not associated with the gauges.

 

[Franzel311]

Do u mean the plugs or r they like a on off switch?

 

[Franzel311]

Is it something I can disconnect and test boat again

 

[bruceb58]

Do u mean the plugs or r they like a on off switch?

They look like the senders that go to the gauges but are just an on/off switch inside.

They actually will be somewhat near each other. For the temperature ones, you will likely see 2 items near the thermostat housing . One will be the sender and one will be the switch.

Same applies to the oil pressure ones but will be on side of the block.

 

[Franzel311]

Ok I'm gonna check that out so is it something that I can disconnect and try to run it or do I gotta buy new ones and install then test...can I do some type of check with a meter?

 

[bruceb58]

I believe they are closed in a fail condition but may need to check that. Easy to do with the oil pressure switch. Measure with the engine stopped and then again with it running.

Looking at a service manual will tell you for sure.

 

[Franzel311]

Ok thanks a million Bruce!

 

[Franzel311]

Well Mr. Bruceb58 I checked what you said to check and the oil switch was faulty and that was what was putting me into limp mode I disconnected it and she is running flawlessly!!! I can't thank you enough you saved me thousands of dollars and or hours of work converting the engine to a carburetor ..if I knew where you lived I'd send you some kinda of gift...Pm me your mailing address and I'll send you a gas card and your next yachting trip will be on me! I can't thank you enough thank you thank you thank you!!!! Y you are the MAN!!!

 

[bruceb58]

Glad you got it fixed. No need to send anything. Just help someone else someday.