Quadrajet Problem Solving > Diagnose a Quadrajet carburetor problem
No ported vacuum???
mrk3cobra:
Cliff any suggestion on what I can check?
Does having manifold vacuum at the ported tubes suggest a problem with the carb?
Toronado:
If it were me I would get one of cliffs rebuild
kits and book and rebuild it your self. Even if it
looks new who know who built it before you got it,
and most important if they did it right. Trying to solve the
carb. problem with out rebuilding it will takes
more time then rebuilding it, short of the cost to rebuilt
it only takes two days, remove, take apart, clean, rebuild,
done. Then you know for the rest of the time you own your car/truck
the carb. has been built right!
mrk3cobra:
I removed the carb. and tried to pressurize the intake manifold with 3psi of air and the manifold will not hold any pressure.
I blocked off the EGR, but I cannot tell were the air is going. The air is not leaking out of the manifold is it possible that it is leaking internally.
mrk3cobra:
Could the air be leaking into the lifter valley.
Marx3:
Since the engine is in a truck, I guess it does not have the biggest cam ever installed, but still, how can you rule out overlap as the factor that lets pressure out of the manifold? I can't imagine that the intake will hold 100% tight at any time, no-matter how little overlap the cam has...
But I dont know for sure... :)
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