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Yes seems like it would be original as your serial number is in that era of 1996 range plus your model number number to the serial number comes up as 443B100JS which comes up as 1996 4.3L [ALPHA]. Here’s your parts catalog for this engine model...

The J1171 sticker is the electric fuel pump, https://www.mercruiserparts.com/bam/subassemblydetail/42256339/28149105

The item to the left/behind the SAEJ sticker (fuel pump) ((under the red wire)) would be the water separator fuel filter base assembly. https://www.mercruiserparts.com/bam/subassemblydetail/42256339/28149105

Maybe ohms check all the spark plug wires and compare notes to the good spark cylinders.

What is the engine serial number from Merc? In searching, it appears there are possibly two different types of intake gasket part numbers and possibly your 17340 might not fit in with the other option out there when comparing all the possibilities...

With that, please bear in mind that It’s been a long running tradition to keep the same subject all on one thread and part of our guidelines here on this forum… had another one been created, one of the 10 forum moderators would have merged the threads together either when noticed or post...

Sorry, please know that even giving free items away is something this particular forum has stayed away from since the beginning of 2000ish…no selling, etc.. Though some things sort of have changed with the writing of guideline number 8 regarding selling, the majority of number 8 stands…...

Sometimes the threads may get paint in them adding to the challenge of installing the fittings and may need a cleaning to get things installed easier feel wise.

I'm not seeing an inner website change option to help with the keep me log in features to this website but in the past of similar issues it has often been found too where the web browser for certain websites one uses accidentally got changed over into In-Private-Window Mode where while in...

Yes, it seems time to open up the drive to replace the impeller and inspect other water flow components ...Post the serial when you get a chance. Here should be your engine parts list, https://www.mercruiserparts.com/4-5l-mpi-250-alpha-bravo-2a441953-thru-2a530777...

What model stern drive is on the boat? Is there a serial number on the drive itself and transom assembly too by chance?

Maybe I missed it but thus far i haven't noticed 12.9inHg in any of the screenshots...Saw 17.2 under Manifold pressure at idle of 6.22 RPM? Maybe the new TMAP sensor changed the readings and hadn't really noticed it yet? Yes, you can run with the vacuum line disconnected for a bit to test as...

With 600+ hours, is this a fresh or salt water boat mostly? If you haven’t, pull the small vacuum line off the fuel regulator and see if it’s dripping fuel.. Pull and check your Positive Crankcase Ventilation Valve for rattling sounds, etc.. Another area that warrants opening up for...

Theory/s... Looking at the design of your oil dipstick to oil pan configuration, one thought could be how was the condition of the old oil from the first oil change and even if it was ok (not milky), did the old oil get stuck within the fitting flow characteristics and then become temperature...

Where did you locate the b830792 number in your first post?

Did your online search of something close to “Livorsi marine Wire harness diagram livorsi emc eec0016062” get you close to finding a pin layout that may possibly work on your model? Though it may not be listed mostly because of the manufacturer involved vs possibly some others out there that...

Hopefully without too much of a thread highjack scenario here, by chance Muc, Jmunk and any others, do you all know of any floating rumors out there of the quicksilver bellows adhesive not holding up (or should I say on) like years past? I have been seeing on different, active MerCruiser...

The exhaust bellows down under the U-joint bellows? Often without using the mercruiser exhaust bellows install tool, and following the guidance of the Alpha, Gen 2 service manual number 14, the exhaust bellows has a tendency to keep slipping off if only tried by hand to install. The stern drive...

Hum, Well I now hope it's not too late as far as you ordering up a mercruiser service manual only because in re-researching this out I just noticed that technically the wrong service manual was suggested within the online Mercruiser parts catalog websites for you 0B830792 serial number that I...

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