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Excalibur 330 misfire |
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steve600 
Groupie 
Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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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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Joined: June-06-2004 Location: United States Status: Offline Points: 10638 |
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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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Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Posted: August-30-2022 at 9:37am |
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Thanks KENO👍
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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: 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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Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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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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Joined: March-02-2019 Location: NEW JERSEY Status: Offline Points: 11 |
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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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bfosbenner
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Joined: March-02-2019 Location: NEW JERSEY Status: Offline Points: 11 |
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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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steve600
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Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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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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Joined: March-02-2019 Location: NEW JERSEY Status: Offline Points: 11 |
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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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JoeinNY
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Joined: October-19-2005 Location: United States Status: Offline Points: 5693 |
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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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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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Joined: October-19-2005 Location: United States Status: Offline Points: 5693 |
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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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67 ski nat
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Joined: July-19-2018 Location: Santa rosa Status: Offline Points: 1180 |
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Posted: 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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