Excalibur 330 misfire |
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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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Fl Inboards
Grand Poobah Joined: January-20-2008 Location: United States Status: Offline Points: 2066 |
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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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All wires are where they belong, simple on this setup
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3604 |
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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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Another new cap, engine surging now, gauge is saying knock sensor. Guess I’ll throw one of those at 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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I will try a third cap today. I just don’t get it
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3604 |
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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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Same result testing #4 at the cap.
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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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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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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10715 |
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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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I’ll try these suggestions tomorrow. Thanks guys for all the ideas!
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3604 |
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Ken the other GM cap issue was only a month ago. You would think I would remember that solution. I thought it was interesting that the previous thread on this stated that the owner of that boat had starting installing a new Dist Cap every season to avoid having these failures. Very bad cap design in my opinion.
Could be a cheap and fast solution for this boat.
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Fl Inboards
Grand Poobah Joined: January-20-2008 Location: United States Status: Offline Points: 2066 |
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Just so you know you cant time these engines traditionally. what is the distributor off set at? The only way one can set it is with a diacom setup. if memory serves me, 0 off set plus or minus 2* is the setting..
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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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NCH20SKIER
Grand Poobah Joined: December-16-2004 Location: United States Status: Offline Points: 2207 |
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I am guessing and hoping (for you) it is a bad cap
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'05 206 Limited
'88 BFN |
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steve600
Groupie Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Interesting read. I could try a different cap. Cylinder #4 loses spark around 2300 and comes back in around 3400.
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10715 |
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Here's a link to a recent thread.
At least your engine runs
Not knowing what you used for a replacement cap quality wise, maybe it'll make you want to try another new cap At least you'll have a spare cap if it doesn't make any difference in how it runs. So when does this thing start firing again as you go up in RPM? Does it misfire again on the way down passing through 3000 RPM and then clear up again?
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steve600
Groupie Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Will do
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3604 |
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Test for fire at the cap on #4.
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steve600
Groupie Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Have tried a different wire with the same results. Looking like nothing more I can do, I’ll have to call the dealer unfortunately
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3604 |
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OK, reboot. Chevy 350 is 1-8-4-3-6-5-7-2 so do the same thing with 4 and 3 to see if #4 will fire with a known good wire. The timing will be late so it won't run right but you could see if a known good wire can make the bad cylinder fire, on the Chevy that would be #3. It will not cause any problems but it might help diagnose. I will edit the post to correct for a Nautique with a Chevy.
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KENO
Grand Poobah Joined: June-06-2004 Location: United States Status: Offline Points: 10715 |
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Umm............Somebody needs to tell you that Steve has a Chevy engine
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3604 |
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OK, this has to be a simple fix if you can just find it.
Shade tree test. Won't hurt anything but might learn something. Edit update: Fire order on this engine is: 18436572 When you remove the #4 spark plug is it pristine white like brand new or fouled Wet with Gas? Black from Carbon build up? The Plug Gap is properly set? I worked on a Ford 5.4L Truck engine, the owner had it in a shop 4 times because it kept killing Coils. These are coil on plug engines. When I inspected it for the source I found a shop put new plugs in it 2 years prior. After that it needed 4 new Coils, installed one at a time over the 2 year span? When I removed the spark plugs I found the #8 Spark plug, near impossible to remove in the Ford Truck, I found the previous shop had dinged the plug gap closed when they installed it. It is very tight and hard to get in there to work but the shop never went back and checked to see why the engine kept reporting miss fires. They had installed new spark plugs so they never checked them for a possible source of the problem. With the plugs replaced the coils worked as intended with no more mis fires. The Ford Computer kept putting that engine into a Limp mode because of the #8 bad plug but the mis fires reported in multiple cylinders not just #8 I have heard when the plug is at zero gap the plug wire voltage can travel through the block and fire other cylinders out of time. Remove your 4 and 3 spark plug wires. Take #3 and route it to #4 spark plug. Leave #4 spark plug wire off for now. Start the engine and see if #4 is sparking using the #3 wire for a spark source. It won't make much if any power but it should have a spark you can see all the time. If this #3 spark source can't make the #4 spark the problem is #4 is grounding the spark plug or the plug is fowled out and dead for some reason. No spark is jumping the plug gap so your test light can't see it. The #3 plug is next in the fire order after #4 so a late spark won't cause any problems but might help test and see if #4 could fire with a good known source. |
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steve600
Groupie Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Just tried new pick up in dizzy, coil, and ignition module. Stumped at this point
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steve600
Groupie Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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If it thru a code, that would help a ton as to where to look
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steve600
Groupie Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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Right so frustrating
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3604 |
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Dang, no easy answers for this one.
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steve600
Groupie Joined: June-09-2010 Location: Milton NH Status: Offline Points: 77 |
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I will try that. I have tried two different wires. Compression test resulted in 180 psi across all 8
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MrMcD
Grand Poobah Joined: January-28-2014 Location: Folsom, CA Status: Offline Points: 3604 |
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Run the engine in the dark and look for spark in that wire going to ground. A bad wire will give you a light show in the dark. Not too many things can cause one wire to lose spark. Just to rule it out I would compression test that cylinder.
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