460 ford. got a heck of a hesitation. got a guage on intake. runnin 18 psi at idle. when throttle is snaped pressure drops to zero? just put the guage on so don't think this normal? accelorator pump in carb? I would think there would be more vaccum? timing, plugs, wires, new coil, all good. any info would be good.
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vacum drop
- Thread starter WHOA BABY
- Start date
Hydro Phil
New member
Normal vacum readings, high vacum idling with throttle blades closed,when throttle snapped open vacum drops. On a car with stopped up cat. converters, vacum stays high when throttle opened. Is vacum steady or fluctuating? When you open throttle to about 2000 rpm, should drop & then level out if rpm`s held steady.
Hydro Phil
New member
Could be in your carb, check the accelerator pump shot, with engine off, look in carb throat & mash throttle, should get two streams of fuel thru pump nozzle.