Twin 1999 OX66's on Scarab 30. Neither engine will power up past about 1700rpm. Both engines have had a major tune and will spin up when they are not under load (idle or test prop). Had 2 sets of mechanics go through the engines and all of the usual stuff checks out (compression, fuel pressure idle & at speed, spark (plugs, boots, Stator voltage etc.)
When the engines are decoupled (ie plug in 2 harnesses at the engine) the port powers up but stbd does not. Should be relatively straight forward...not...:
- fuel starvation - pressure checked and injectors cleaned
- spark not advancing to bring on other 2 cylinders - CDI fault
- CDI intentionally not bringing 2 cyl up - sensor or CDI fault
- other????
Both mechanics are stumped and have said that the only next step is to swap the CDI's and start chasing wiring (They said that I may as well do this myself)
Questions:
1) is there a way to isolate the synch feature/module in the key switch so it acts like 2 singles (disconnect synch? unplug the engine harness???) so that I can test engines separately without buying a single key switch / harness that I will never use again. Want to make sure that I don't blow up anything by trying to run the dual switch with only 1 engine attached
2) is there a way to test the codes / outputs from the engine into the synch module to see what fault the stbd engine is throwing to activate the safe mode? Any other info on how the synch module works, wiring diag etc.
3) any other suggestions on the stb engine? Next steps will be:
a) look for obvious corrosion on the CDI grounds and plugs (lookes real clean at first glance)
b) swap CDI from port to stbd. if problem follows CDI then bad CDI, if not then bad input into CDI
c) chase sensor inputs into CDI (thermo, oil etc.)
d) ????? suggestions ????
Thanks in advance. Would dearly love to salvage some of the season
When the engines are decoupled (ie plug in 2 harnesses at the engine) the port powers up but stbd does not. Should be relatively straight forward...not...:
- fuel starvation - pressure checked and injectors cleaned
- spark not advancing to bring on other 2 cylinders - CDI fault
- CDI intentionally not bringing 2 cyl up - sensor or CDI fault
- other????
Both mechanics are stumped and have said that the only next step is to swap the CDI's and start chasing wiring (They said that I may as well do this myself)
Questions:
1) is there a way to isolate the synch feature/module in the key switch so it acts like 2 singles (disconnect synch? unplug the engine harness???) so that I can test engines separately without buying a single key switch / harness that I will never use again. Want to make sure that I don't blow up anything by trying to run the dual switch with only 1 engine attached
2) is there a way to test the codes / outputs from the engine into the synch module to see what fault the stbd engine is throwing to activate the safe mode? Any other info on how the synch module works, wiring diag etc.
3) any other suggestions on the stb engine? Next steps will be:
a) look for obvious corrosion on the CDI grounds and plugs (lookes real clean at first glance)
b) swap CDI from port to stbd. if problem follows CDI then bad CDI, if not then bad input into CDI
c) chase sensor inputs into CDI (thermo, oil etc.)
d) ????? suggestions ????
Thanks in advance. Would dearly love to salvage some of the season