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#1 | |
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Jeff Lee 7494 D/S '70 AMX |
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#2 |
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4gc carb? Check for leaking brass floats and float setting. Ron.
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#3 |
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Some ignitions like a msd digital programmable have provisions to adjust timing on the launch. Just taking a swing, but if for some reason your timing was retarding a ton on the launch, maybe that would be an issue. It would not show up anywhere else.
Ed, are you running the 283 now? 4 jets have big float bowls. I would be shocked if you ran low on fuel, but what if they were set too high and dumping fuel down the intake when you launched?
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James Schaechter 3163 STK |
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#4 |
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do you have a o2 reading ????,, whats the first gear ratio?? gmonde
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#5 |
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It would help to open secondarys on the line 8600 is just where it starts to sound good,LOL
I think you have some good ideals posted, I know it's a 4GC but I have had similiar quadrajet problem,needle and seat will slightly leak won't run over just idles about 100-200 rpm slower and bogs on launch,took me a little bit to find the first time,on Q-jet I have to take off top of carb and hold float pivot pin down and turn on fuel pump it will take 1-2 minutes for fuel to creep up it leaks so slightly,maybe able to try on 4GC. new needle and seat seals,but now I check them before putting top on. Mike Taylor 3601 |
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#6 |
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What is the fuel pressure doing when this happens?
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Nelson Kowal Stock 345 |
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#7 |
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I think anytime we have to run a carb such as a 4GC and Autolites, and whatever else, when having problems like this it's probably going to save a few grey hairs to bolt a tried & true Holley double pumper of the same CFM rating on it just to see what happens. If it picks up considerably, then you know where to look. If not, then you know your required carb is good and you ned to look somewhere else.
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Jeff Lee 7494 D/S '70 AMX |
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