4.3GXI-G distributor

[Zundorf]

Hi!

I am crusing (at least trying to..!) on the western coast of France with a 23ft Sessa (Italian made day cruiser); for a while now, I haven't been able to reach WOT (4400/4800 RPMs) with my 4.3GXI-G serial N° 4012197821.


I have checked and replaced about everything that has been said in various posts about the subject!!
new fuel cells (low & high pressure) readings within specs
compression test readings within specs
new TPS
new Injectors
new spark plugs, new wires, new distributor cap and rotor ...

I asked a local Volvo tech to come over and check it with his Vodia outfit and all he found was a DTC 1642 "buzzer open" !!!! I don't see how this could impact engine RPMs!?

It cranks right away, idles well doesn't stall or backfires nor misses !! it just feels sort of sluggish and lazy to get on plane ... and barely reaches 3600 RPMs Also note that between 3/4 and full throttle on the lever there is no change ?!

I have rebuilt engines on motorcycles and cars (lately a 1978 MGB) but this particular SOB (pardon my french!) is driving me nuts.

I have been reading a lot about "phasing" the distributor but the way mine's made, once down in its place, I can't turn it like you would do on a car since the holding clamp is like a fork with to inner flat "jaws" that only allows the distributor to set in one place...
any wise advice from all you experts would be dearly appreciated !!!

Thanks in advance!

 

[Bondo]

Ayuh,..... Welcome Aboard,...... Is the bottom of the hull clean,..??
Have you tried smaller props,..??

 

[Zundorf]

Ayuh,..... Welcome Aboard,...... Is the bottom of the hull clean,..??
Have you tried smaller props,..??

Hi! and thanks for looking into this!
Yes, the hull is clean and I am using the original propeller mounted on the boat since the beginning; in fact, the commercial brochure for this boat using this same propeller ( 3 blade 14"3/4x21) clocks it at 40knots at 4800rpms !
The best I recently did was 25 knots at 3600rpm; I am not actually looking for speed, I would just like it to get on plane quickly (same brochure says it will get there at 16knts which I have trouble reaching!)

 

[Bondo]

Ayuh,..... Regardless of what the brochure says,.....
Have you ever had it run anywhere near those numbers,..??

Here's a link from the Adults Only section in my signature that should lead ya in the right direction,.....

 

[QBhoy]

Hi. Sounds like it might be in a gaurdian mode. Has she ever seen the performance you are expecting it to do ? Is the engine original to the boat ? Are you trimming up and all that ?