Hesitation until secondaries kick in
Thread Starter
7th Gear
Joined: Jan 2015
Posts: 7
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Hesitation until secondaries kick in
I have a 1969 corvette and I've recently replaced the badly worn valve train with a new comp cams package. However, before realizing that it was the valve train that was the problem I adjusted/messed with damn near everything else (carbs, timing, ignition, etc.) Now that the car is up and running I'm experiencing lag and the occasional backfire upon initial acceleration up until the secondary carbs kick in then flies like the beast it is. Any hints as to where the problem may be? I have the holley 3x2 carb setup by the way
Last edited by yuckybovine; Jul 22, 2016 at 06:41 PM.
Safety Car
Joined: Aug 2000
Posts: 3,711
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From: San Antonio TX
Problem in the accelerator pump would be where I would focus my attention. Could be maladjusted (there are plenty of tutorials online and on the Holley Tech page for how to properly adjust the accelerator pump shot and it's very easy to do properly), a bad diaphragm, dirt in the discharge channel, worn check ball.
Yeah, it could be other things depending upon what fiddling you did but I'd start with the pump shot.
It could also be an ignition problem, but you don't normally get a lean backfire from an ignition issue. You just get lethargic acceleration.
Yeah, it could be other things depending upon what fiddling you did but I'd start with the pump shot.
It could also be an ignition problem, but you don't normally get a lean backfire from an ignition issue. You just get lethargic acceleration.
Safety Car
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Glad you found it on a more serious note.
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Glad you found it on a more serious note.
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