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back fire through carb under load |
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Stevt 
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Joined: August-13-2007 Status: Offline Points: 5 |
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 Topic: back fire through carb under loadPosted: August-17-2007 at 7:01pm |
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I have a 68 mustang with a 302,in the yard in neutral it runs fine,revs up and sounds great. In the lake when I took off it backfired through the carb and stalled. I tried to adjust the distrubtor in the water and got it running back to the ramp. I think it's a timing problem, does anyone know what the timing should be and at what RPM'sor any other suggestions?
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Tim D
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Joined: August-23-2004 Location: United States Status: Offline Points: 2635 |
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Posted: August-17-2007 at 9:23pm |
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Replace the power valve in the carb if it backfired through the flame arrestor. And change the accel pump too.
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Tim D
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nuttyskier2002
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Joined: September-28-2005 Location: United States Status: Offline Points: 669 |
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Posted: August-17-2007 at 11:55pm |
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Backfiring through the carb can be caused by a couple of different things. The most likely cause is a lean air/fuel mixture. With the age of your boat I wouldn't be surprised if your backfire was isolated to a worn camshaft (lobe wiped off). Especially with oils that are available today. Timing can cause backfires too but that usually occurs in the exhaust.
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95 Malibu Echelon w/Mercruiser 350 Magnum Skier
Former boats: 88 Ski Centurion Tru Trac II 59 Chris Craft Capri (woody) |
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79nautique
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Joined: January-27-2004 Location: United States Status: Offline Points: 7872 |
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Posted: August-18-2007 at 12:56am |
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accel pump and timing
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backfoot100
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Joined: January-03-2007 Location: United States Status: Offline Points: 1897 |
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Posted: August-18-2007 at 8:02am |
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To answer your original question. Not positive about a 302 timing but I know that a 351 or a 350 will be 8 degrees BTDC at 600-700 RPM. I would assume that a 302 would be about the same. Start there and see how it does.
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When people run down to the lake to see what's making that noise, you've succeeded.
Eddie |
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Stevt
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Joined: August-13-2007 Status: Offline Points: 5 |
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Posted: August-18-2007 at 9:54am |
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Thanks all for the advice, it's 6:30am and I'm ready to go try a few differnt thing's (my wife thinks I'm nuts). This site is great and I'm glad I found it. The only other older Correct Craft in my area is "Hot Pant's" and I told him yesterday about this site. He was driving down the road when he saw a Correct Craft go by and had to turn around and follow it to the ramp. We talked and he watched as me and my son took off,then he watched as I putted back to the ramp. I need to get this thing running right ! Thanks
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