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Excalibur 330 misfire |
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67 ski nat 
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Joined: July-19-2018 Location: Santa rosa Status: Offline Points: 1194 |
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 Topic: Excalibur 330 misfirePosted: June-11-2023 at 5:10pm |
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Faulty parts are becoming more common. Probably non usa manufacturing
I watch tooo Much roadkill TV etc. they had two new distributors out of box bad. Stumped ‘‘em for a bit but the dulstich had several spares to try everything. 2 bad out of box from Orielly or such Are you going to rebuild all or limp along with coed stuff. As budget allows |
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JoeinNY
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Joined: October-19-2005 Location: United States Status: Offline Points: 5698 |
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Posted: June-10-2023 at 10:41pm |
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I don’t think it knows the temp and adds fuel - I think more likely it needs more fuel because of the air density and the cold chamber. Just a guess though- I just know that it will
Misfire spring or fall until warmed up - if your thermostat isn’t working it won’t warm up and could keep misfiring |
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bfosbenner
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Joined: March-02-2019 Location: NEW JERSEY Status: Offline Points: 11 |
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Posted: June-10-2023 at 9:42pm |
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My question is what is actually happening? Is it running rich with the extra fuel building up somewhere causing the misfire?
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JoeinNY
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Posted: June-05-2023 at 12:02am |
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It’s not a closed loop system so spark and fuel levels are fixed in the tune - with the temp not right the tune isnt right. My excal will misfire until warmed up when the water is really cold so seems reasonable it might not be real happy with a thermostat stuck open.
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bfosbenner
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Posted: June-04-2023 at 9:42pm |
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I'm still not sure what the cold engine temp reading is doing to cause the misfire. Maybe a bit too much fuel. With no O2 sensor I cant really tell.
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steve600
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Posted: June-03-2023 at 9:09pm |
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Awesome…,chased your tail for a while but you got it!!
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bfosbenner
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Posted: June-03-2023 at 9:00pm |
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Update, New thermostat solved the problem!!!
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bfosbenner
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Posted: May-31-2023 at 11:55pm |
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Update, New GM cap and rotor did not fix. I also have stuck thermostat and engine is running cold. Part is on order.......
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steve600
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Posted: May-29-2023 at 10:26pm |
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Sounds like my headache, chasing everything! I had put new plugs in mine and kept saying it can’t be the plugs, they are new plugs. Low and behold try another set of plugs and problem gone. In my 25 years of working on engines that was the first bad new plug for me.
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bfosbenner
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Posted: May-29-2023 at 10:07pm |
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So my story is similar except in 2021 my 196 with 2,000 hours ..... misfire under load at 28-30 mph, slight misfire at 32 and gone at faster speeds.
I changed cap, rotor, coil, cranks sensor, new distributor with cap and rotor, map sensor, spark plugs, wires, cylinder heads (one water jacket leaked anyway. Fuel Injectors, alternator (possible ac ripple to ecm, seemed to get better if unplugged ) Tried another boats ECM, My next step was to check timing chain backlash and when I pulled the cap it was all burnt up. So I got a new AC Delco cap and rotor and installed on my original distributor. All was ok!!! Great, fast forward to 5/28/23 Misfire came back exactly the same. Tried Accel cap, no change. Cam retard is 0. Ill try an new AC Delco again this week. |
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steve600
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Posted: August-30-2022 at 9:37am |
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Thanks KENO👍
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KENO
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Posted: August-30-2022 at 7:29am |
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Well, "ya done good" ...............and saved a bunch of money not making that short tow to NECC
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steve600
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Posted: August-30-2022 at 6:54am |
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Yes it was a great V7…unfortunately I had just bought the boat and had nothing to go by as far as how it should run. Coming from a simple to work on 1984 2001.
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KENO
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Posted: August-30-2022 at 6:47am |
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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steve600
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Posted: August-30-2022 at 6:20am |
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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
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Posted: August-30-2022 at 6:07am |
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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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MrMcD
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Posted: August-29-2022 at 8:01pm |
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Glad you figured it out.
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steve600
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Posted: August-29-2022 at 7:51pm |
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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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steve600
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Posted: August-26-2022 at 8:56pm |
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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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KENO
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Posted: August-16-2022 at 6:45pm |
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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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JoeinNY
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Posted: August-16-2022 at 4:14pm |
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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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Gary S
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Posted: August-16-2022 at 2:45pm |
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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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steve600
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Posted: August-16-2022 at 1:49pm |
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Is it worth trying a new knock sensor? Or is that just a stored code?
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steve600
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Posted: August-16-2022 at 1:23pm |
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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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JoeinNY
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Posted: August-16-2022 at 1:13pm |
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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
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Posted: August-16-2022 at 11:03am |
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Yes it is in there.
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JoeinNY
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Posted: August-16-2022 at 10:39am |
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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
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Posted: August-16-2022 at 8:05am |
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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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steve600
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Posted: August-16-2022 at 7:55am |
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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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KENO
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Posted: August-16-2022 at 7:45am |
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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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KENO wrote: