Excalibur 330 misfire |
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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I’ll try these suggestions tomorrow. Thanks guys for all the ideas!
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KENO ![]() Grand Poobah ![]() Joined: June-06-2004 Location: United States Status: Offline Points: 10777 |
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You forgot to answer the question about the misfire when reducing speed (and load) on the engine.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Yes the miss is between 24-3400 rpms. Throttling up and slowing down, load or no load give the same results.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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I do not know what the distributor offset is at. It’s my understanding there is no adjustment on this engine without diag equipment.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Same result testing #4 at the cap.
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MrMcD ![]() Grand Poobah ![]() ![]() Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3620 |
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Time to install a new cap.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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I will try a third cap today. I just don’t get it
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Little bit of an update, engine temp wasn’t getting above 105, I checked the thermostat and was stuck open from impeller pieces. Put new thermostat in, started it, and about 140 degrees it started to run smoother. Went for a ride and the backfire is gone @ 3k but it still has a miss in the same rpm range.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Another new cap, engine surging now, gauge is saying knock sensor. Guess I’ll throw one of those at it.
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MrMcD ![]() Grand Poobah ![]() ![]() Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3620 |
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Double check your spark plug wires. Odds are a couple wires are crossed/ in the wrong spot.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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All wires are where they belong, simple on this setup
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Fl Inboards ![]() Grand Poobah ![]() ![]() Joined: January-20-2008 Location: United States Status: Offline Points: 2076 |
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If you dont check the cam offset you are chasing your tail until you know that it is correct or distributor has not moved. I have seen this before.. and yes you need diacom to check cam off set it. good luck |
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Hobby Boats can be expensive when the hobbyist is limited on their own skill and expertise.
1993 Shamrock "fat" 20. 2008 Nautique 196 5.0 |
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Okay is there anything at all I can do with the dizzy without diag equipment?
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KENO ![]() Grand Poobah ![]() Joined: June-06-2004 Location: United States Status: Offline Points: 10777 |
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Speaking of dizzy..............that's me.
I think a good recap of the problem and what's been done is in order here, since however many days and posts later, the word "backfire" just showed up ![]() Now we have no fire, misfire and backfire all being mentioned. Your engine should be running at 160 plus degrees, otherwise the computer thinks it's still warming up and your fuel mixture is gonna be rich. The standard thermostat in that is a 160 degree thermostat. It'll probably run better than is now does with your 140ish temperature, will it fix this mystery firing issue? probably not but you won't lose anything by getting temperature where it should be.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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I’ve never had the misfortune of chasing a problem like this. Your right, forever post with many different problems.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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As it stands now, I put a third cap on it. That helped with the no spark, miss to #4 cylinder. Also changed thermostat bringing engine up to normal running temp. So now it is definitely running better, but is surging and saying knock sensor on the dash. I’m running non ethanol 91 octane all fresh. So I will look at that sensor today.
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JoeinNY ![]() Grand Poobah ![]() ![]() Joined: October-19-2005 Location: United States Status: Offline Points: 5697 |
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Do you have a knock sensor in place? It originally would have been in the water drain hole on the starboard side. They get removed for winterization, if removed and replaced with a pipe plug that could lead to the error.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Yes it is in there.
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JoeinNY ![]() Grand Poobah ![]() ![]() Joined: October-19-2005 Location: United States Status: Offline Points: 5697 |
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Next step would be to make sure it is working- no breaks in the wiring and the threads are complicating the circuit (no excessive Teflon tape).
if you have reliable spark now you might want to move onto cleaning the fuel injectors. |
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Okay, it has no tape on the threads. Pulled the wire off and all looks good. Running non ethanol 91 and seafoam thru it
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Is it worth trying a new knock sensor? Or is that just a stored code?
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Gary S ![]() Grand Poobah ![]() ![]() Joined: November-30-2006 Location: Illinois Status: Offline Points: 14096 |
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If you suspect a injector you could just move it to another cylinder and see if it follows.
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JoeinNY ![]() Grand Poobah ![]() ![]() Joined: October-19-2005 Location: United States Status: Offline Points: 5697 |
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Knock sensors are relatively cheap - you could however test it before you replace it. I didn’t do anything other than replace my knock sensor to make the code go away. If the boat has been sitting cleaning the injectors- maybe replacing the orings and filters is a decent idea and not much more difficult than swapping them around.
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KENO ![]() Grand Poobah ![]() Joined: June-06-2004 Location: United States Status: Offline Points: 10777 |
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Last time I wanted to know if a knock sensor was working, I hit one of the heads with a hammer and watched the timing to see if it retarded about 8 degrees or so.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Still chasing this problem. Put a new knock sensor in with no change. Been running non ethanol and seafoam thru it, changed FCC filter. Tried new wires, guess it’s time to drive it on the trailer and bring to New England Correct Craft.
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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So crazy ending to painfully long journey. One of the new spark plugs was defective. Not fouled or broke, just for some reason not firing. So between two bad dist caps and a defective plug she’s all up and ripping to 5100 rpm’s again. Thanks all for the suggestions and help.
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MrMcD ![]() Grand Poobah ![]() ![]() Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3620 |
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Glad you figured it out.
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KENO ![]() Grand Poobah ![]() Joined: June-06-2004 Location: United States Status: Offline Points: 10777 |
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So did you just decide to swap plugs for some reason or did it make the trip to the dealer for a plug swap? |
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steve600 ![]() Groupie ![]() Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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I scratched my head for days, sitting looking at this engine thinking wtf else could possibly be wrong? I’ve swapped everything to do with ignition, three caps, two sets of wires, coil, dist pick up, and fcc filter. Decided to try another set of plugs before pulling it out. Only thing I haven’t tried twice! Sure enough that was it. Misfire was gone and boat pulled to 5100 rpm’s. Could only get 4200 before. Something so simple all along….
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KENO ![]() Grand Poobah ![]() Joined: June-06-2004 Location: United States Status: Offline Points: 10777 |
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So i guess back at the beginning it really was a great running V7 after all ![]() You should go out right now and buy 4 lottery tickets in honor of your #4 cylinder. And......... glad it's fixed
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