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  1. R

    2000 Volvo Penta 5.7GSi PEFS still running rich!

    You might want to talk to OBD Diagnostics and get their take on your situation. They say they can check and repair MEFI units. https://obd2allinone.com/ecmrepair.asp
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    Volvo Penta 5.7Gi Closed Cooling Question

    The cooling system details on the European VP site have to be matched to the engine model. The heat exchanger is only applicable to the 5.7 Gi-FF, not the 5.7 Gi-F. This means that this engine was supplied raw water cooled and must have had an aftermarket fresh water system added to it at...
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    Red engine motor year mystery

    The Data Base says it is a Gi-F and was a new engine manufactured in May 2006. The alternator bracket says "5.7 GXI family" this bracket was used on nearly all VP small blocks that year. It appears it was a replacement new complete engine put in your boat in 2006. All your pictures show parts...
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    Red engine motor year mystery

    It seems it was a new engine according to the database. See: https://muldermotoren.com/program/volvopenta-marine-leisure/volvopenta-engine-database
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    2000 5.7 GSi PEFS MAP sensor?

    The EFI diagnostic manual TBI section is for MEFI 3, the PFI section is for MEFI 4.
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    2000 5.7 GSi PEFS MAP sensor?

    I'm not sure disconnecting the KS is a good idea, I'd make sure all the other diagnostic guide items have been checked first. Maybe the attached checks (many of which have been covered) would be appropriate.
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    2000 5.7 GSi PEFS MAP sensor?

    I'm not aware of a" knock detected code" only a KS inactive (faulty sensor) DTC44. The KS circuit works all the time as a normal operating parameter.
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    2000 5.7 GSi PEFS MAP sensor?

    VPA 7742218 03-2003 I can't remember where I got it from, there are sites on the web you can download it from, but I can't vouch for any of them, could be risky!
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    2000 5.7 GSi PEFS MAP sensor?

    Your probably right with regard to the knock sensor but just to be clear the first action it does is to increase fuel. The attached is probably too small to read but it is page 29 of the VP EFI Diagnostic Manual which describes the operation of this system.
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    2000 5.7 GSi PEFS MAP sensor?

    Well there's not much left that could be wrong! If it runs fine at 1600 and above with expected vacuum but rich at idle with low vacuum the issue must be a variable not a constant. So something is changing the mixture at speeds below 1600. The only thing not mentioned so far that can change...
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    2000 5.7 GSi PEFS MAP sensor?

    one other thought, have you disconnected the fuel cell vapor line to check that the float valve is sealing completely? If it is allowing even a small flow of fuel to pass to the inlet manifold it would mess up mixture at idle.
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    2000 5.7 GSi PEFS MAP sensor?

    I don't see it being a vacuum leak as all that would do is give you a higher than normal idle speed (the MAP would keep the mixture correct). Unless the leak was only local to the MAP and the manifold vacuum was normal! Are you sure there is not a pin hole in the MAP hose? You say the timing...
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    2000 5.7 GSi PEFS MAP sensor?

    It could be poor combustion causing the higher than normal inlet manifold pressure at idle. You say fuel pressure, cylinder compression and timing are all good. The MAP seems to be responding to manifold pressure, so something must be enriching the mixture beyond acceptable for good...
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    Hydrolock, swim platform, riser height and static water line question

    All I can say is that I have never seen any manufacturer written instruction telling you to measure anything other than the distance to the TOP of the riser.
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    drive thump thump or chug chug sound

    I had a boat with a Mercruiser 4.3 that made a thumping noise which turned out to be rotten stringers under the engine mounts, the lag bolts lost grip. All looked good but the small rocking of the engine produced a thump! A quick test to eliminate this as the source is to put your finger on...
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    Hydrolock, swim platform, riser height and static water line question

    Well this blows my theory out of the water! Attached is a page from the newer 5.0 GXI-P manual. Although it shows a better way of testing static water level, it also clearly shows a water level ABOVE the "Y" pipe! It also says load to maximum capacity. I would test it per this latest page and...
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    Hydrolock, swim platform, riser height and static water line question

    My manual does say " Load the boat as you would for normal boating"
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    Hydrolock, swim platform, riser height and static water line question

    With regard to the bulletin, Note 5 states "ail kits in this group also used for earlier engines with SX.M and Dp·SM drives". Note 5 is noted against "4.3/5.0/5.7L Ocean Series" which lists kit 3888846. Having said that, You measured your riser height correctly the first time and as you got 15"...
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    Hydrolock, swim platform, riser height and static water line question

    Thinking some more about the need to replace the "Y" pipe, I believe it has to have longer legs to keep the inlets above the static water level. Could be important if an overheat event burns through a bellow, maybe the difference between floating or sinking the boat!
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    Hydrolock, swim platform, riser height and static water line question

    Not to put a damper on things! But Volvo Penta Riser Extension Kit. Bulletin P-25-1-4 states that extended risers have to be used with matching exhaust "Y" pipes and are sold as kits. I guess the extension creates a different angle for the Y pipe to match. From the Bulletin I believe the kit...
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