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Old     (CALIV210)      Join Date: Jun 2015       06-01-2021, 5:56 AM Reply   
Hello gurus ,

Ok so 3 weeks ago we had the boat out and it seemed to run perfect as usual . Fast forward to Saturday as soon as I started it I knew something was off . It was missing real bad and shaking like it needed a tune up and also down on power we didn't do any towing just drove to a friends place and hung out and drove back to the ramp at the end of the day. So instead of going out Sunday we stayed home and I found the dist cap was really corroded so I decided new cap, rotor, plugs, and wires was in order . Well they didn't have the wires so I did everything else including a new fuel filter. yesterday we dropped the boat in and it was nice a smooth running again so we thought we were good to go . Once we idled out of the 5mph zone and throttled up I could tell it was much smoother but still down on power . So we anchored in a cove fairly close to the launch and spent the day swimming and getting sun burnt .lol. While the family was out swimming I fiddled with the engine to see if I could figure out what the heck was going on . This is where I found something a little off . I decided to just grab the injectors while it was idling and you can really feel them opening and closing as the signal pulsed to each one . Except one of the injectors I could barely feel that one opening and closing . It felt like it was getting the signal but the either it was frozen and trying to open and close or maybe had blockage keeping it from opening and closing . I know this is a really unscientific way to diagnose a sticky injector but maybe its the reason it runs smooth at idle but down on power under load. I'm going to slap the noid light on the injector plug and make sure its getting signal which I think it is . I have a set of injectors from a very low hour salvaged boat of the same vintage that look identical so I think I will try to sneak a new one in that hole and see what happens . What do you gurus think what else can I do. Give it to me straight guys I can handle it. 😆
Old     (denverd1)      Join Date: May 2004 Location: Tyler       06-03-2021, 12:53 PM Reply   
sounds like you found the issue. likely not opening all the way up at higher RPM. check the wire on the problematic injector for corrosion or nicks in the coating.
Old     (TTyler89)      Join Date: Jun 2015       06-07-2021, 7:16 AM Reply   
Before you go messing with injectors, put a fuel pressure gauge on and check your fuel pressure. Could be a bad fuel pump. Unless your boat has sat for 3-4 years unused, injectors typically dont go bad or get stopped up unless your rubber fuel line is deteriorating.
Old     (CALIV210)      Join Date: Jun 2015       06-08-2021, 11:30 AM Reply   
Thanks for the replies guys !! My fuel system is pretty clean and there was nothing in the fuel filter that I could find . Im going to swap the injector this afternoon and take it our again this weekend and see what it feels like .
Old     (CALIV210)      Join Date: Jun 2015       06-14-2021, 5:59 AM Reply   
So Replaced the injector and cleaned the spark arrestor and the boat runs much better but still not right just yet. I am embarrassed to say that I cant even remember the last time I cleaned the arrestor it was terrible. Going to check into an antisiphon valve issue and find a fuel pressure gauge to hook up and do some testing .
Old     (corerider)      Join Date: May 2008       06-14-2021, 12:21 PM Reply   
You said you replaced the plugs, cap, rotor but no the wires. Read the resistance of the wires and make sure they are all within a certain resistance of each other. If you find one with higher resistance than most of the others that may point to an issue as well. Also pull the plugs and read the tips... might show you if a cylinder isn't firing, too rich/lean, or oil fouled.

I agree to check fuel pressure as well. I think you're on the right track, but there's a few more things you can check without spending money that may pinpoint the issue.
Old     (TTyler89)      Join Date: Jun 2015       06-14-2021, 7:01 PM Reply   
Out of curiosity was your cap a crab cap design with the plug wires coming out 2 sides vs on top. If itís the crab cap design they are notorious for shorting out internally. Even new ones out of the box are sometimes bad. Just a thought as well.

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