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12-04-2001, 05:11 PM | #1 |
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Join Date: Apr 2000
Location: middleburg, fl, usa
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Damn carburetor, I need help with a carburetor problem.
I have been having a problem with my carb cutting out every once in a while. I will be driving along and it's like it goes rrrrrrrr blub rrrrrrrrrrrrrr blub rrrrrrrrrr. Sorry that is the best way I know how to describe it. It is like it will cut off for a second and then it will go with out any problems.
Have any ideas on what it could be and how to fix it?
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James Cox RHC Member #44 nochevy@hotmail.com 1991 Mustang LX Dart iron eagle block, 4340 28oz 347 crank, 4340 h-beam rods, probe ultra light pistons canfield heads “race ported by Brent Frazier”, solid roller cam and lifters “custom grind”, kooks 1 7/8" race headers, and much more. Engine built by Brent Frazier. |
12-04-2001, 08:43 PM | #2 |
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TTT
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James Cox RHC Member #44 nochevy@hotmail.com 1991 Mustang LX Dart iron eagle block, 4340 28oz 347 crank, 4340 h-beam rods, probe ultra light pistons canfield heads “race ported by Brent Frazier”, solid roller cam and lifters “custom grind”, kooks 1 7/8" race headers, and much more. Engine built by Brent Frazier. |
12-04-2001, 10:44 PM | #3 |
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Location: Stockton, Ca
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When this happens is the engine warm already? Try jetting leaner on the secondaries? What type of carb is it? Float bowls set correctly? Fuel pressure? Ignition system (which I doubt)? Check it out and let us know
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12-05-2001, 08:27 AM | #4 |
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Yes the engine is warm already.
It is a Holley 750 dp vacuum secondarys. Fuel pressure is set at 7 psi. The ignition is a digital 6+. I will try to jet it down it the back a little.
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James Cox RHC Member #44 nochevy@hotmail.com 1991 Mustang LX Dart iron eagle block, 4340 28oz 347 crank, 4340 h-beam rods, probe ultra light pistons canfield heads “race ported by Brent Frazier”, solid roller cam and lifters “custom grind”, kooks 1 7/8" race headers, and much more. Engine built by Brent Frazier. |
12-05-2001, 09:44 AM | #5 |
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Join Date: Oct 1998
Location: Az
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doesnt really sound like a carb problem... might check the ground wire for the MSD...
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84 convt,roller 302,AFR's, performer 3.55's, underdrives BBK shorties stock cam, 1.7's 13.58@102.84 and a '68 stang .. project 8 sec street car... 557 big block + N20 :-) http://members.cox.net/darkknight302/68nwrear.jpg |
12-05-2001, 12:29 PM | #6 |
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Location: Minneapolis, MN
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This does sound more like an ignition problem. If it is eratic like that-if it is a fuel problem-possibly a power valve on the way out. Maybe a little tear that is oopening and closing it. Although this sounds very similar to the problem I just tackled in my 84. Thought for sure it was fuel-almost no question. Worked on the carb for a few hours and I decided to put some new plugs in that I had sitting on the shelf for about a month-while I was thinking about what else to change or adjust on the carb. Ended up that was all it was-just a change in plugs. Fired it up to run to a local parts store to get some info on my carb and it ran perfect. Has been running perfect since then. The plugs that I took out of the car were only about 5 months old-and weren't fouled either-very strange-but glad I didn't spend any more money.
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1984 Mustang 1997 Miata |
12-06-2001, 08:24 AM | #7 |
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Don't totally rule out the carb, what intake are you using? I'm using the Torker289, and I had a fuel perculation issue (caused the same issue). I installed a heat shield, and everything was fine.
Just a thought. Rob |
12-08-2001, 06:33 AM | #8 |
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Location: Ventura, California
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Can you be more specific as to when this occurs? Only at WOT? Only while cruising? At what rpms? Under load/no load? Also, what mods have been made to the carb? Have you changed the vac secondary spring? Checked the float level?
Take care, -Chris
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12-08-2001, 11:28 AM | #9 |
dude5l
Join Date: May 2001
Location: Grande Prairie, Alberta, Canada
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750 dp AND vacuum secondaries? I assume you just mean vacuum secondaries. Try dropping your fuel pressure to 6 psi and check your float settings. Also if it happens while just cruising at consatnt throttle try a heavier secondary spring.
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Good luck! Brad R. 1992 L.X. 5.0 coupe MODS: A few little bolt ons New Best time ...11.60 @ 128 mph @ 2000+ ft altitude. Rice Haters Club member #39 Users rides #2542 |
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