Had S9, went to s21 because S9 would not do 5G and 2G was going away
Now have S25 refurb and has more than I need
Problem with every phone change, ring tones always change and I don't want to download my old ones
You have weak compression, and weak compression means things are not producing same power, burn rate. If gap is not making a good open/close if spark is weak there can be even more power reduction
Your compression numbers are low but should run well enough.
If your timing is off, points not set correctly, carb not adjusted correctly could hinder it running with the exhaust pressure build up as Scott mentioned
No, the Red wire needs to be connected to full time 12V source. Use the Red/Purple wire which is connected to one side of the 50 amp breaker on the motor
The Pink wire is connected to purple at the coil
https://documents.holley.com/199r12505_website.pdf
Welcome
Is this a new to you boat or is this something that just started?
The first things is check fuel pressure of the high and low pressure pumps
HP pump should be 39 +/- 3 psi
LP pump depends on which GI version, EF 8 +/- 4 psi, HU to WT 5 +/- 3 psi
Don't know about your motor but my new Verado service manual says the belt is replaced by using a tool and rotate the motor which rolls it off and back on
MEFI's all use fuel tables
The table simply is a X and Y column table.
rpm = A
Temp = B
MAP = C
injector pulse with = D
This is some of my old 509 info
Need to fill the filter up. Electric fuel pumps don't suck very well like mechanical ones
Cycle the fuel pumps and keep bleeding the fuel rail until all the air is out, then try to start
